基于STM32的光功率计的设计

介绍了一种基于STM32的高精度光功率计的设计原理和实现方法，给出其数据处理和修正方法。该光功率计以STM32为微控制器，使用InGaAs PIN光电探测器来实现光电转换，并利用低噪声光电放大器AD795和高速多路模拟开关MAX4051搭建电路以实现测量功率范围内的量程自动切换控制，不仅可以消除测量时的非线性误差，还可以提高测量的动态范围和精度。同时，采用24位的模数转换器ADS1232来实现高的测量分辨率，并借助数据处理和修正技术进一步提高测量精度，减少测量误差。实际测试结果表明：该光功率计具有成本低、精度高和性能可靠等优点，可以满足工程应用中光功率测试的需要。

Design of optical power meter based on STM32

This paper introduced the design principle and realization method of a kind of high precision optical power meter based on STM32, and gave its data processing and correction method. The optical power meter used STM32 as micro controller, with the use of an InGaAs PIN photodetector to realize photoelectric conversion, and by the use of a low noise photoelectric amplifier AD795 and high speed multi channel analog switch to build circuit to achieve automatic range switching control in the measurement range of optical power, it can not only eliminated the nonlinear error of measurement, but also can improved the measurement dynamic range and accuracy. At the same time, use a 24 bit ADS1232 ADC to achieve high measurement resolution, and with the help of data processing and modified technology to further improve the measurement accuracy, decrease the measuring error. The actual test results showed: the optical power meter has the advantages of low cost, high precision and reliable performance, can meet the demand of optical power test in engineering application.