The using of cell phone will be shielded by green laser pointer during class
Spectrum not only to qualitative analysis using the chemical composition, but also to determine the number of element content. Spectral analysis method with high sensitivity and accuracy. Because each atom has its own characteristic lines, it can be used to identify the spectrum of the material and determine its chemical composition. This method is called spectral analysis. Do spectral analysis, we can use emission spectra, absorption spectra can also be used. Advantage of this method is very sensitive and quickly. An element in the substance of the content of 10 to the minus 10th power grams, you can find it from the spectrum of characteristic lines, so it can check it out. The quality problem of green laser pointer should be carefully analyzed.
For example, in silicon and germanium semiconductor materials inspection is not to achieve a high purity requirements, it is necessary to use spectral analysis. Historically, the spectrum also help people find a lot of new elements. For example, rubidium and cesium is seen from the spectrum of a previously unknown characteristic lines were found. Spectroscopy for studying the chemical composition of celestial bodies are also used. The early nineteenth century, when the solar spectrum in the study, found that it's a continuous spectrum, there are many dark lines. Initially do not know how the formation of dark line, then people understand the causes of the absorption spectrum, only know that it is issued inside the sun glare of the sun after a relatively low temperature absorption spectrum of the atmosphere generated. The technical problem of 100mW green laser pointer is very critical to quality.
Careful analysis of these dark lines, put it with characteristic lines of the control of various atoms, people know that the sun's atmosphere contains hydrogen, helium, nitrogen, carbon, oxygen, iron, magnesium, silicon, calcium, sodium and other dozens of elements. In geological exploration can test the use of spectrum contained trace amounts of ore in precious metals, rare elements, or radioactive elements and so on. With spectral analysis speed, greatly improving efficiency. You can also use the spectrum of the chemical composition of celestial bodies and the school set the standard of the original length, etc.. Grating, also known as diffraction grating. Principle is to make use of multi-slit diffraction of light dispersion occurs (spectral decomposition) of the optical components. It is engraved with a large number of parallel width, offset slit (groove) of the flat glass or metal. The large number of slit raster, generally tens to thousands of per mm. The unit price can reflects the quality of 50mW blue violet laser pointer to some extent.
Monochromatic parallel light through each slit of the diffraction grating and the interference of the sutural form a wide dark stripe, that stripe is very thin pattern, these sharp details and bright stripes called spectra. Line position varies with wavelength, when polychromatic light through the grating, the different wavelengths of spectral lines in different positions on the formation of spectra. Grating formed by the light spectrum is a single-slit diffraction and interference more than the common seam results. Diffraction grating generated by the position of spectral lines, can-type d ? sinq = kl said. Where d = a + slit spacing of the slit width b, called the grating constant; q is the diffraction angle, l is the wavelength, k = 0, ± 1, ± 2 ... ... is the spectral series. This kind of 200mW green Laser Pointer is one of the most welcomed green laser pointer .
This equation can be calculated with the wavelength. Grating stripes with strength, narrow stripes, each characterized by a wide interval, with excellent resolution performance. Because the diffraction grating can be accurately measured wavelength. Diffraction grating resolving power R = l / Dl = kN. Where N is the number of slit, slit a few more stripes brighter tomorrow, finer grating resolving power is higher. Increasing the number N slit grating technology to improve the resolving power is an important issue. Stepper motor which is connected with the grating, can be programmed to control the stepper motor, thus controlling grating rotation angle. The technical standard of green laser pointer should be strictly complied.
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