| Laser, because of its unique characteristics, has been widely used in many fields, especially in the field of measurement of laser, it plays a decisive role. Laser measurement technology outstanding advantage is that natural benchmark waves are directly linked to the laser, which is able to achieve high precision measurement, makes interconnection application between photo electric conversion and the single chip microcomputer easier and has measured data analyzed and processed. The research of laser system in this paper is based on unique measuring characteristics oflaser, combined with built-in electronic system, responding for the shade change when each parts interrupt the light, which is able to make real-time measurement of static parts or rotating parts and damage control.First of all, discussion from the laser system adopts the semiconductor laser, it analyzed and elaborated the three feet the internal structure of semiconductor laser and the methods of working, then making integrated exploration for three feet of semiconductor laser speckle model. From the angle of the longitudinal mode and transverse mode analysis, getting the result of ideal working model for TEM00 model system. Through comparison and analysis for the R11 with different resistance data, we concluded that when the R11 is 5K, it is able to make the semiconductor laser work in constant current state, and guarantees the stability of laser beam that has a wavelength (650 nm) output, proved that the reliability of the APC driver circuit, fulfilling the requirements of laser system and realizing real-time power closed loop.Then, we mainly discuss the core part of laser system. First, we analyzed the Gaussian beam circular confocal cavity mirror’s wave field and the basic properties of Gaussian beam, expressing the requirement of laser beam. Through studying the lens of the laser optical system, from analysis of transformation for the Gaussian beam through thin lens and complicated lens, we achieved lens group selection of laser systems. At last, we studied the formation of the focusing and collimation of laser Gaussian beam, and completed the calculation of beam focusing and collimation, after the experimental demonstration, it is concluded that when the theoretical value1=3.5 mm, it accorded with the actual application of the conclusion.Finally, we have a brief introduction about the photoelectric diode BPW24R when it completed collection ofreal-time laser signal, expounding the working method of photoelectric diode. Then showing the acquisition circuit based on the design of surrounding the photodiode, acquisition system has the main control chip STM32F101T6V6A as the core, charge amplifier OP213F as the core of the laser signal acquisition. Through the experimental demonstration, based on photoelectric acquisition circuit degined by diode BPW24R characteristics, when the R16=1K, programmable potentiometer U5 input value is 140, it is able to better meet the laser system to collect, corresponding to the actual requirements of this laser system. |
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