百瓦級激光功率的測量方法研究
[Abstract]:With the rapid development of laser processing technology, the requirement of laser quality in industrial production is improving. Laser power is an important parameter of laser, which determines its application field and scope. In the process of laser processing, especially in the process of processing for a long time, the attenuation of laser power seriously affects the quality and efficiency of the products. Therefore, if the laser power can be monitored at any time in the process of processing, it is of great significance to improve the quality and the qualified rate of the product. Based on this, a thermoelectric laser power measurement system with high sensitivity is designed by using wide range temperature detection technology. In view of this system, the research content mainly includes the following several points. Firstly, some commonly used laser power measurement methods at home and abroad are introduced, and a laser power measurement system is designed on the basis of these methods. Based on the radiation characteristics and conversion effect of laser, the measurement scheme of laser power is determined by analyzing the relationship among energy, power and temperature. Secondly, the overall implementation scheme of the measurement system is described. After converting the power signal into the temperature signal by using the laser probe sensor, the temperature signal is collected through the peripheral system circuit and STM32, and the laser power is deduced from the collected temperature curve. On this basis, the physical and mathematical models of the measurement system are established, and the laser detection sensor, the core module of the measurement system, is designed. Then, according to the measuring principle of the system, a wide range temperature measurement method based on thermistor is designed. Based on the mathematical relation between charge and discharge time and resistance of thermistor produced by RC first order circuit system, the measurement of resistance value of thermistor is realized, and the necessary temperature value is obtained by calculating the relationship between resistance value of thermistor and temperature. According to this method, the measuring circuit of the system is designed, which includes the RC first order circuit, the comparison circuit and the secondary charge and discharge circuit which satisfies the initial charge and discharge conditions. The square wave input in the temperature measurement circuit is realized with STM32. The acquisition of charge and discharge time and the control of secondary charge and discharge. Finally, the measurement system is debugged and verified by experiments. The sensing temperature curves under different laser power are simulated experimentally, and a power solution method based on curve fitting is proposed. The comparison experiment with the standard power meter shows the feasibility of the laser power measurement system designed in this paper.
【學(xué)位授予單位】:湖北工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN24
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