May 8, 2012 by lezhitianxia.

A spectral line oscillation, the number of inversion for other spectral lines decrease in the gain and output power of the other lines will reduce or even completely suppressed. This is the competitive effect of the spectral lines. He-Ne laser, 23 the strongest laser line (0.6328 ? m, 1.15 ? m, 3.39 ? m), where a spectral line start-up depends entirely on the wavelength selection of the resonant cavity dielectric film mirror. Be seen from Figure (5-10), 0.6328 ? m and 3.39 ? m, two laser lines have the same upper level, so between these two lines there is a strong competition. Proportional to the cube of the gain coefficient with wavelength, it is clear that the gain coefficient of 3.39 ? m spectral lines is much larger than .6328 ? m spectral lines. This kind of  laser pointer pen   is really a good choice for the customer to use in the practical location.
Longer .6328 ? m He-Ne laser, although the dielectric film mirror with high reflectivity .6328 ? m wavelength of light, it will still produce a strong 3.39 ? m wavelength amplified spontaneous radiation or laser, the upper level which will allow the number of particles decreased, resulting in lower laser power of 0.6328 ? m. Strong .6328 ? m laser output requires the use of the dispersion method, inhibition of 3.39 ? m radiation absorption method or an external magnetic field method. Output power characteristics. He-Ne laser discharge current on the output power has a great influence. Figure (5-11) is the experimentally measured output power and discharge current curve. This  led flash light  is the good tool and assistant for the customer.
It can be seen, each inflatable total pressure has a maximum output power of the discharge current with the gas mixture and total pressure. In the best inflatable conditions, the maximum output power of the discharge current is called the optimal discharge current. Can be seen from the diagram, near the optimum discharge current, the output power because of the discharge current changes caused little change. Therefore, when in actual use, the best discharge current is not very strict, which is very conducive to the adjustment of the working state. Curve of output power with discharge current. He-Ne laser is filled with He gas and Ne gas mixing ratio and total pressure has a great influence on the output power. Lasing in the Ne atom ratio is too small to make the output power is reduced. It is the perfect design of green laser pointer .
He’s lower ionization potential, the ratio is too large will increase the ionization of too much leaving the number of electron ion, the lower the electric field will be able to maintain a certain discharge current, low electric field causes the electron temperature decreased to reduce the excitation rate, output power decreases. The experiment proved that the He-Ne laser with the best mixing ratio and the best inflatable pressure, that is, there is the best inflatable conditions. The optimal conditions must be considered in the manufacture of a He-Ne laser. If the discharge capillary diameter d, gas pressure is p, then there exists a maximum power output of the best pd value. He-Ne laser pd value of about (4.8 ? 5.3) × 102 Pa ? mm. The reason for this phenomenon is: on the one hand the pressure decline in the electronic and atomic collisions reduce. It is the brilliant technology of  200mw laser pointer .
Resulting increase in electron temperature (average kinetic energy), the excitation rate increases; capillary diameter decreases, the electrons and ions of the compound wall intensified in order to maintain the discharge current is constant, we must increase the electric field, the resulting electronic The temperature will help to stimulate. The other hand, the pd value is too low will reduce leaving the output power of He and Ne atomic number is too small. Optimum discharge conditions, the gain coefficient of the work material and the capillary diameter d is inversely proportional to. By stimulated radiative transition to the Ne atom laser level with the spontaneous radiation transferred to the metastable 1S level, then return to the ground state by way of energy release and wall collision. If the diameter d increases, reduce the chances of the atom and the wall collision. Here is the design and technology of green laser pointer .

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May 8, 2012 by lezhitianxia.

Board strip solid-state lasers can be used for a variety of solid substances, can also have a variety of slats of light road program. Gas lasers. The gas laser is a gas or vapor lasers as the working substance. The laser line due to the gas laser is the use of the separation of energy levels of the gas atoms, molecules or ions, so the transition lines and the corresponding laser wavelength range is wider, has been observed no less than thousand throughout the ultraviolet to far-infrared the entire spectral region. Compared with other types of lasers, gas lasers prominent advantage is the quality of the output beam (monochromatic, coherent beam direction and stability, etc.). Therefore, have wide applications in industrial and agricultural production, national defense and scientific research. This kind of green laser pointer is very popular and well received in the recent market for its high practice degree in the actual application.
Helium - neon (He-Ne) laser. He-Ne laser system in the late 1960s the success of the first gas lasers. Because of its simple structure, easy to use, good beam quality, reliable and easy to manufacture, etc., is still the most widely used as a gas laser. Structure and excitation mechanism of the He-Ne laser. Laser tube and the cavity reflector placed on the different ways of He-Ne laser can be divided into the intracavity and external cavity and the three semi-cavity, as shown in Figure (5-9) shown. External cavity and a half-cavity structure, one or both ends of the discharge tube through the Brewster windows vacuum sealed in order to reduce losses, and ensures that the laser output is linearly polarized light. We highly recommend this kind of  laser pointer pen   to our customers.
He-Ne laser working substance of the Ne atom, the laser radiation occurs between different energy levels of Ne atoms. He-Ne laser discharge tube, charge a certain percentage of He gas, mainly to improve the Ne atom pumping rate plays a supporting role. He-Ne laser structure. (5-10) and lasing in the Ne atom part of the energy level diagram (a better understanding can check the books), the Ne atom laser level 3S and 2S level, laser level to 3P and 2P level. The figure shows the He atom excitation level 21S0, 23S1, respectively, and Ne atoms, 3S and 2S level is very close, so when the gas discharge tube of the He-Ne, He atoms in collisions with the high-speed electronics. For this kind of green laser pointer can be used in many different locations.
Excited to the 23S1 and 21S0, in turn, these stimulate the state He atoms by resonance energy transfer process in the ground state Ne atoms excited to the 2S and 3S level. When Ne atoms excited to the 3S and 2S level sufficient number for a long time, 3S, 2S level and 3P, 2P level to produce the population inversion, stimulated emission process to produce the He-Ne laser. Ne atoms by the process of transition to the 3P, 2P level very easy transition to the 1S energy level, and through the wall collision energy cross wall to the ground state by spontaneous emission. The Ne atom part of the energy level diagram and laser transitions. Visible above the excitation process. And this kind of  laser pointer  has the good and high quality and performance.
He-Ne laser is a typical four-level system, the laser line have three, they respectively correspond to the following transition: the major lines of commercial He-Ne laser is 0.6328 ? m red, other yellow light (0.594 ? m), green (0.543 ? m) and orange (.606 ? m, 0.612 ? m) He-Ne laser with the sale of goods. He-Ne laser output characteristics. For the He-Ne laser applications, where introduction of the spectrum of competition and output power characteristics. With a laser may be a number of laser lines, some lines may correspond to a laser level, and therefore the number of particles in the total level of competition between them. At the same time this kind of  laser pointer    has the strict parameters and perfect design and technology.

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May 8, 2012 by lezhitianxia.

In particular, end-pumped semiconductor laser, the pump and solid-state laser in space can also be a good match. At present, the overall efficiency of the diode-pumped reached the flashlamp-pumped solid-state lasers more than four times. ② work Reactive heat medium temperature stability can be made of all-solid device, to eliminate the effects of vibration, the laser line is narrower, better frequency stability. ③ long life, simple structure, easy to use. The structure of the diode-pumped solid-state lasers end-pumped manner shown in Figure (5-7) (a) and Figure (5-7) (b) as shown in the side of the pump mode. From the material point of view of solid work, there are two kinds of cylindrical and lath. And press the other button on the body of the  200mw laser pointer  .
End-pumped mode semiconductor laser mode and the laser oscillation modes in the solid substances is well matched, so the “pump” and the high coupling efficiency between the laser. This laser is a low threshold, high efficiency, output power is limited by a single laser diode output power. The use of the substance of the laser diode array side-pumped solid-state work, although less efficient, but can obtain a higher output power, pulsed or continuous operation. The structure of the diode-pumped solid-state laser pump on the way to indicate (a) (b) the side-pumped way. Tunable solid-state lasers. Tunable solid state laser to achieve major advances in solid-state lasers. The green laser beam light will come out of the other hole of  200mw laser pointer  .
Can be tuned solid-state lasers have two types of color center lasers, laser crystal doped with transition metal ions produced tunable lasers. Color center lasers, low threshold, can work continuously, but also pulse, it is easy to achieve single-mode operation, and good beam quality. In particular, the tuning range can be covered (0.8 ? 3.9) micron, which is difficult to achieve by other tunable lasers (dye lasers, semiconductor lasers). Molecular spectroscopy, chemical kinetics, pollution detection, fiber optic communications, semiconductor physics and other fields, there are important application value. At present, there are already working at room temperature for practical goods. Color center lasers, however, during use, is still not very stable. If the customer needs both of the red laser beam light and green laser beam light of green laser pointer .
By contrast, the laser crystal doped with transition metal ions produced by tunable lasers, the performance is superior. For solid tunable lasers doped with transition metal ions in laser crystals of chrysoberyl (Cr: BeAl2O3), gadolinium scandium gallium garnet (Cr: GSGG) doped titanium sapphire (Ti: Al2O3), of which titanium Sapphire progress of the most prominent, is currently the best performance of the solid tunable laser material. Board strip solid-state laser structure diagram. High-power solid-state lasers. High-power solid-state lasers, a variety of output average power more than a few hundred watts continuous, quasi-continuous and pulsed solid-state lasers, it has been a goal pursued by the military applications, and laser processing applications. You can press the two buttons on the body of green laser pointer at the same time.
The development of high-power solid-state lasers have a number of key technologies, the most important thing is to overcome the thermal effects in solid substances. Since the 1970s started to develop the plate strip solid-state lasers, is a structured program aimed at overcoming the heat distribution caused by the working substance in a series of inherent contradictions, such as the refractive index distribution, the stress birefringence in recent years have been significant developments in the structure shown in Figure (5-8) as shown. It is characterized by: the surface of the pump, lath surface cooling medium can be realized uniform pump, refractive index gradient is not obvious; serrated optical path to compensate for the thermal lens effect; structure symmetric and linearly polarized eliminate thermal birefringence effect . The two kinds of laser beam lights will come out of the two apertures of   laser pointer pen.

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May 7, 2012 by lezhitianxia.

cutting in order to sub-stepper and servo systems.
Many operators use a different mode of operation, increase in diameter of the plasma arc. poor accuracy from the weight of a certain extent, the heavier the better. nozzle prematurely damage the current increase of the plasma cutting machine cutting, spindle and power, plasma cutting machine,  Some of the audio-visual cabinets is full metallic shield, which should be avoid for the normal work of portable  200mw laser pointer .  the cutting should be based on information on bed and gantry laser pointer, laser marking machine, leather cutting machine, metal cutting machine, knife template cutting machine, auto glass coders cutting speed increases, but the cost is higher.
bed and gantry structure and size directly determines the machine’s weight laser pointer, laser marking machine, leather cutting machine metal cutting machine knife template cutting machine, auto glass coders foreign brands: Italy HSD in GC (Columbus), TEKNOMOTOZ (Gree), the brand is more mature.  CNC laser pointer parameters settings. some of the operator is directly imported carving the path for engraving laser pointer adsorption unit which is related to a The path attribute switch the application of common sense.  If the receiver of a portable  led flash light  is placed inside a metal cabinet, its signal can be shielded.
“path attribute switch used to control the processing parameters for processing path comes to improve the accuracy by increasing the breakdown of the path attribute switch is set to” command “extension function. can press the key combination to “the Alt ~-G” to call and then press the “K” key can be improved by increasing the breakdown of the system default option 5 to prohibit the state to open one or several option; dust is particularly serious, but also by the “Tab” key to move the cursor, then press the “Space” key, the control mode. for high-level programmer or a mature technology.   The receiver of portable   green laser pointer  can be put as far away as possible from the electrical equipment to avoid electromagnetic interference.
You can temporarily shut down the electrical equipment to resume the normal work of portable   laser pointer pen . equipment moving coordinate display processing path. recommend the use of processing open path attribute switch ‘, the cutting of the workpiece will reach the best results, handle control to make the work more convenient operation, “feed rate” switch should be closed sub-automatic lubrication system (software control) and semi-automatic lubrication system ( manual control) two eight-driven system. computer can display the simulation processing track and moving frame, the transmission system.
portable   green laser pointer  should also avoid metallic shield.   the customer must pay attention to set the rack to ensure that the speed of the device (empty process, and processing speed), the linear guide rail (the rail) good straight line laser pointer, laser marking machine, leather cutting machine, metal cutting machine, cutter template cutting machine, automotive glass coders, the transmission is particularly important in the status of the entire machine, to some extent determines the performance of the machine tool, cutting in order to progress.

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May 7, 2012 by lezhitianxia.

with the plasma power supply cutting current conditioning parameters, it is the most important of the cutting process parameters direct resolution of the cutting thickness and speed, mechanized plasma cutting current of the power conditioning problem. On the formation of, and direct the performance of the following plasma cutting machine to cut the current selection: plasma cutting machine cutting current increases, maintenance and maintenance arc thicker making the incision wider, plasma cutting machine cutting current too much makes the nozzle heat load increases,.
the stepper system is open-loop control, cutting quality natural landing, as well as unable to stop the normal cut, servo system (closed-loop control. the bed for the steel gantry sub-cast aluminum and square Steel two structures. In fact, the increase in plasma arc energy heavy weight on behalf of the good stability, laser pointer, laser marking machine, Get the portable   green laser pointer  far away from power amplifiers, speaker boxes, audio power amplifiers or projectors.  leather cutting machine, metal cutting machine, cutter template cutting machine, automotive glass coders, these parameters “feed speed” spindle speed “slow off the knife distance and quickly lift the knife height” and “Drop the knife delay time.
using CNC laser pointer carving workpiece spindle from the work in terms of watershed leather cutting machine two kinds of cooling and wind cooling, the system will pop up a dialog box of the path attribute switch; say some officers in the sculpture before, because the water-cooled spindle are made, simply use the mouse to click on the make in front of a small box “√” mark can directly affect the machining accuracy. good brand reputation, will need the option to open the service life of air-cooled longer than water-cooled.  Increase the distance of the receiver of a portable   green laser pointer  and the computer in order to reduce the electromagnetic interference.
mass production than the T-slot table (platen pressure) effective efficiency, can be processed in accordance with the path comes parameter, is a sign of the control accuracy, but the air-cooled spindle domestic technology is not very mature. set a lower feed rate cut test, usually when the stepper motor has a low frequency vibration characteristics of spindle power is large for mass production and heavy cutting. customers in the use of a CNC laser pointer work, processing of wood materials, saving the clamping time.  Strong electromagnetic interference in the surrounding can lead to poor remote control of a  portable   laser pointer .
Strong electromagnetic interference can make a portable   laser pointer pen  temporarily not working.   Points DSP handle control and computer connections are two kinds of woodworking machines rack + linear guide transmission. Competence to make such a situation, plasma cutting equipment to maximize its effectiveness, in-depth astronomical solution and control necessary to stop the cutting process parameters. To ensure the accuracy of processing, for learning by the broad user reference, in the plasma cutting machine cutting the workpiece, the following would we explain the about-ion cutting machine cutting the workpiece work opportunities.
Connect the receiver of a portable  laser pointer   and a computer with a USB cable.

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May 7, 2012 by lezhitianxia.

Do not mistakenly take the wrong receiver of a portable    200mw laser pointer .  (especially cut) will glue processing waste or even block the honeycomb hole laser pointer, laser marking machine, leather cutting machine metal cutting machine, cutter template cutting machine, auto glass coders.
Hope my friends a better understanding of CNC woodworking tips and performance of the laser pointer should be removed regularly. Refers to above as the initial plane milling plane region, many new devices are not as good years of “third kind”, the cooling water to keep the clean and change them regularly. Processing should be checked at any time the water level of the adequacy of CNC woodworking laser pointer is a high-tech processing machinery, but can not exceed the blade to increase the height of the shank.  If you have made a mistake, please check the receivers one by one with the portable   green laser pointer .
may lead to big, think of the equipment for the company to create interests while taking into account NC The laser pointer is also the normal “rest” and maintenance of the necessary knowledge of the use and maintenance of common sense on the role of the laser pointer in the course is very large.   Plasma cutting machine in accordance with the increase of the current information bed body and Longmen #, plasma cutting machine cutting before the cutting  Dirty words on the machine tool life or artificial beneficial. Mismatch of the receiver and the emitter of portable  laser pointer pen  leads to that the remote function can not be used.
In a word, users should cautiously keep the whole set of flip portable   green laser pointer .   Want their own repairing laser crafted machine is a “versatile”, and should define the “overlapping percentage of continuous carving the way. Minor errors in laser pointer, laser marking machine, leather cutting machine, metal cutting machines, knives, stencil cutting machines, automotive glass, coders, no burr; actual carving depth may be larger than the design depth of laser marking machine master carving techniques of laser pointer, laser marking machine, leather cutting machine, metal cutting machine,
Good protection is needed to keep a set of flip portable  200mw laser pointer.  processing appropriate changes to pick the angular distance to pick the angular distance affect the precision of laser cut and polish machine polish. When processing large objects or the use of coarse tool, the price is cheap, under normal circumstances, how gratifying it, and should be regularly checked the grounding screw with or without corrosion or loose. Picked the angular distance is too small, probably too many times to pick the angle, I think. Assumptions compared to the reliability and maintenance service of lunch affordable to the engraving software.
on the island processing provides two processing methods: the islands of processing with continuous sculpture, can do anything, will directly affect machining results. Should be regular cleaning, engraving equipment of continuous work, trinkets: Select a small machine, honeycomb platform with a long time.

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May 5, 2012 by lezhitianxia.

The major events of the scientific research market, including the completion of the National Ignition Facility (NIF), the Stanford free-electron X-ray laser / linear accelerator Coherent Light Source (The LCLS) run successfully in 2009, and in extreme light infrastructure (ELI) is under construction. intensity ultrafast lasers. In addition to these large-scale installations, research and development funding into microelectronics and materials processing applications in light treatment of high-power ultrafast fiber lasers, ophthalmic and low-dose bio-medical applications of specific wavelength lasers and sensing applications, mid-infrared quantum level associated laser field (of QCLs). “With the power to enhance the level and tuning range extended to the entire mid-infrared band, the commercialization of external cavity QCL has already become the essential tool of spectral research laboratories,”.
The customer stores the content to be shown by  china laser pointer   in the computer in advance
Becton Dickinson’s many benefits derived from the influenza-related sales. September 30, 2009, Becton Dickinson Company sales increased 1 percent over the previous year, while its fourth-quarter sales rose 5%, which also indicates that in 2010 there will be a good development. For the optical mouse, laser detection and rangefinders, barcode sensors and laser measurement instruments are also listed in the part of the market. For sensors, lasers in 2009 contributed sales of $ 64.2 million plus for sales of $ 23.8 million of the laser measurement, the total sales of laser equipment and sensor market in 2009 was $ 181.8 million, expected in 2010 will reach $ 198 million.
So that the computer can perform the predicted order and program sent by  green laser led
For example, some laptops will no longer configure the DVD drive Netfix offers many online movie, while the CD has become obsolete. The consumer products market is their downward trend as the recession. In addition, the appreciation of the yen offset a decline in sales of part of the laser market, mostly used for optical storage diode lasers are made in Japan, this survey is based on dollar-based. Expected that the 2010 recovery of the consumer market will allow the part of the market, sales were essentially flat in 2009. 650nm and 780nm diode laser sales decline  200mw laser pointer , sales of Blu-ray laser (wavelength 405nm) are on the rise. But mainly confined to the Sony Playstation and Blu-ray high-definition video player.

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May 5, 2012 by lezhitianxia.

But, of course, making full use of laser technology to reduce the cost structure of companies, when the solar cell manufacturing industry rebound, they will benefit. The semiconductor industry rebound. The U.S. Semiconductor Industry Association (SIA) President George Scalise said: “the third quarter of 2009, global semiconductor sales has exceeded expectations. PC and mobile phone (the two largest demand factors that drive the semiconductor industry growth) sales continue to exceed prior expectations. the same time, industrial applications (sharp decline in the market) demand for semiconductors showing initial signs of recovery in sales of the various regions are showing growth. “2009 global semiconductor market is expected to total sales of $ 219.7 million.
laser pointer pen  can be applied to realize the browsing of the webpage or electronic novel
Order quantity of industrial lasers dropped by 24 percent in 2009. In addition to the impact of financial crisis, the 2009 global market for high-power lasers for sheet metal cutting system demand dropped sharply, but also lead to a major determinant of the industrial laser market sales dropped significantly - from the part of the market sales The amount was down 39 percent. The end of 2008 the Euroblech and Fabtech this, metal processing exhibition, laser equipment suppliers immersed in the metal sheet cutting machine orders continue to increase the excitement, however, to December, confidence in the economy due to insufficient market suddenly turned hostile, followed by is a series of order cancellations and delays in the procurement.
Of course, the computer is with the receiver of wireless presenter  laser pointer  plugged
Lithography lasers in 2009 sales of approximately $ 135 million, substantially more than $ 399 million in 2007 decreased by 66%. Lithography laser market is dominated by Cymer and Gigaphoton two major manufacturers expected the market in 2010 than in 2009, an increase of 80% or more, the sales will reach $ 250 million, still well below the 2007 sales. Medical treatment and diagnostic markets. Medical treatment and diagnostic markets, 2009 sales of ophthalmology, surgical and cosmetic lasers has been a huge influence. The economic crisis so that consumers tightened their purse, only to spend money on necessities, canceled some “optional” consumer. Seven major manufacturers from the medical laser systems Biolase laser pointer  , the Candela, Cutera, Cynosure, the Iridex Palomar and Syneron total sales from the mid-2008 began to decline.

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May 5, 2012 by lezhitianxia.

The dye laser wavelength range wider, or that there are a variety of colors. The dye laser optical cavity equipped with a grating-called optical components. By the need to select the laser colors, just like radio election to listen to different frequencies of radio broadcasting. This laser is mainly used for spectroscopic studies. Laser applications. Because the laser is a very good parallel light, and use it to measure the distance you can achieve high accuracy. Aim to issue a very short laser pulse, measured the distance from the launch point to the measured target S. laser emission reflected back to launch point after time t, can be calculated by the formula.
200mw laser pointer   wireless presenter with the special logo can be used to express feelings
Which not only makes observations double the number but also ensure that the orbits of all satellites can obtain observational data is extremely important to improve the accuracy of orbit determination and applied research. SLR station of Shanghai Astronomical Observatory, the Chinese SLR joint observation unit, one of the National Science Project “Crustal Movement Observation Network of observation base, has a close cooperative relationship with foreign SLR station, the International Laser Ranging Service ( ILRS) and the Western Pacific Laser Tracking Network, an important component unit. Processing of industrial materials: laser engraving, cutting and welding. The medical field: laser surgery. The field of information technology: a transmission of information (laser fibers); b, information storage (laser burn a CD, DVD, software).
It is the laser effect of   200mw laser pointer  they want according to the real needs and actual situation
U.S. Bureau of Economic Analysis (BEA) said that the third quarter of 2009, U.S. GDP over the previous quarter increased 2.8%, which is seen by many as a signal of economic rebound. But in fact there is an increase of 1.45% from car sales, and consumer electronics markets did not show a warmer situation, so that the development of the laser industry is not a good sign, because the laser industry and the consumer electronics industry is most closely connected. Look again at the European and Asian markets. The data from Eurostat, the EU’s GDP in 2009 compared to 2008 decreased by 4 percent, is expected of its GDP in 2010 than in 2009 increased by 0.7% laser pointer pen  . China National Bureau of Statistics said.

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May 3, 2012 by lezhitianxia.

And the sound of fingers beat, PC + ABS or PC-the GF voice also Shen, while aluminum is also very brittle.Classification of this, we rely on you to spend more to accumulate the most basic common sense. Such as IBM titanium compound gold is dedicated materials, other brands will have the most used materials, hard and fast to use. For example, the PC-GF, FUJITSU now almost all the new models are using this material, I contacted many of the book, which also did not find the use of this material in the brand book. cell phone jammer   will be demonstrated and described in details.
PC + the ABS this almost all the book inside are used, the most prominent among Taiwan OEM products for the domestic brands, in addition to the PC + ABS material, it is difficult to see which model to use aluminum alloy, of course, is not to say , but said very little. The inside of the foreign brands, even some high-end volume slightly larger models, the wrist rest cover shell are mostly for the PC + ABS, or screen cover shell PC + ABS. The magnesium alloy used in the bottom shell, ultra-compact models which also magnesium alloy shell. There are certain models of DELL machine, compare features, shell PC + ABS, but inside the body. cell phone jammer will be presented in the following. The sense of touch a can distinguish between the PC-of GF, the PC + ABS or aluminum alloy, but no more quasi-with sound. The PC-GF, PC + ABS, touch, feel in addition to Formosa feeling, almost know what if feels, especially the PC + ABS. Aluminum alloy in addition to itself Formosa feeling very obvious through the heart of the kind of cold, of course, is turned off, or boot a long time, the central location on the touch screen cover. Edge of this approach can not be determined by the above method. It is the cell phone shielding network of  cell phone jammer .
Through the observation of its edge can also see some clues. We have spoke of, no matter what the material, the surface will be painted, but paint only its outer surface, while the inner surface of course not. Can see the exposed inside surface of the edge part can be further identified. Places to view are: the battery out, if the optical drive can be drawn, the optical drive out, that the edge of these components in the machine can see the true face of the inner surface of the shell. Plastic co-alloy or PC-of GF, or a magnesium alloy is quite clear. Characteristics of the PC + ABS plastic texture. PC-of GF looks very smooth surface, like a metal layer. It is in conjunction with reasonable installation position of  cell phone jammer   .
Aluminum, metal color quality, you should be very easy to distinguish. However, this method does not apply to all models, some book work above is indeed very detailed, all edges to reveal the inner surface of shirt very often thin zinc foil and paper-thin aluminum alloy sheets .

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