The phase shifter is also an important component of interference measurement system. Mechanical phase shift phase shift, wing plate phase shifter, and metal film phase shifter phase shift and polarization method. Shown in Figure 3.4: Figure 3.4 mechanical method phase shifter schematic. Interference fringe count, by shifting the phase difference between two interference fringes of light intensity signals, the signal after amplification and shaping, backward and differential treatment, the four phase followed by a difference of the pulse signal, as shown in Figure 3.5 : Figure 3.5 sentenced to count block diagram. Laser heterodyne interferometer length measuring technology. Heterodyne interferometer: the introduction of a certain frequency carrier signal of the interferometer, so that the measured signal to pass through the carrier, the interferometer using AC amplified, isolated from external environmental interference caused by DC level drift. Three different kinds of colors of green laser pointer can be customized for the customer.
There are two ways to produce the interferometer carrier signal, one participating interference of two beams of light to produce a frequency difference of the two-beam optical coherence results appear the phenomenon of "optical film", converted to electrical signals, the difference frequency carrier; the other is in the reference beam interferometer reference arm directly generate the carrier signal modulation, interference with the light of the measuring arm. The former is called optical heterodyne interferometer, while the latter said that subject to the heterodyne interferometer. The former represents the laser interferometer. Laser interferometer optical path shown in Figure 3.6, the helium-neon laser applied along the axial direction to the magnetic field due to the Zeeman effect laser is split into a certain frequency L-polarized light and right-handed polarized light. The dual-frequency laser interferometer optical path. Measuring mirror movement of the Doppler shift can be expressed as. green laser pointer have different characteristics.
Measuring the mirror displacement is calculated by: the laser interferometer length measuring applications for example. Laser angle measurement principle of the small-angle interferometer similar, and are based on the trigonometric sine of the principle. Issued by the dual frequency laser perpendicular linearly polarized light and polarizing beam splitter group 1 after separation into two parallel beams a distance R, respectively, fired at the A and B of component 2 of the prism angle prism. Shown in Figure 3.7, the measured corner: laser goniometer Schematic. The laser measuring the refractive index of the use of the laser interferometer technology, its optical path as shown in Figure 3.8 shows: laser range finder is the use of laser accurate determination of the distance of the target instrument. The early 1960s, the emergence of the laser played a great role in promoting the development of the EDM. Laser high brightness, good color, strong direction, a narrow beam, is the ideal light source for optical rangefinder. The emitter of wireless presenter green laser pointer will send the signal to the receiver.
With other rangefinder (as compared to the microwave range finders, optical range finder, etc.), laser rangefinder with detection distance, ranging accuracy, strong anti-jamming, privacy, memory, small size, light weight , and high repetition rate. The classification and the principle of laser range finder. According to the different measurement methods, laser ranging can be divided into a pulse ranging method and phase ranging France, the former measurement accuracy is relatively low, for military and engineering measurement accuracy requirements of the occasion is not too high; the latter is relatively high measurement accuracy has been widely used in the measurement of the earth and engineering. Ranging laser pulse. The laser pulse ranging principle. Because the speed of light is constant, the propagation of light along a straight line, by measuring the beam in the test distance to and from the time can be calculated straight-line distance between two points. The emitter of cell phone jammers will send various orders to the receiver.
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