消D-alpha线的高性能UV-NIR复合光源的设计与实现

Abstract

在利用光学原理实现高精密测量的过程中，光是信号的载体，因此光源性能的优劣对测量结果的精确度起着至关重要的作用。采用双光源正交方式，并结合滤光技术消除D-alpha线的影响。利用L6561功率因数校正器设计降压型PFC驱动电路，输出单路基准电压，缩短了整体电路的动态响应时间，使工作电路的效率大大提高。选用电流型UC3843芯片并结合TLC271芯片设计单端反击式高频电路，高精度输出300 mA电流。最终实现UV-NIR复合光源输出连续、平滑、稳定的光谱，光谱波动低于3%，电压波动低于0.05%/h。 The performance of the light source is of great importance to the accuracy of the measurement results for the reason that light is the carrier of the signal for high precision measurement based on optical principle. In this study, the influence of D-alpha line is eliminated by combining the or-thogonal mode of double light source with the filter technology. Using L6561 power factor corrector design of Buck PFC to drive circuit and output single reference voltage shortens the dynamic response time of the whole circuit and improves the work efficiency greatly. A single end counter type high frequency circuit is designed with current type UC3843 chip and TLC271 chip to output 300 mA high precision current. The UV-NIR composite light source is implemented finally to output continuous, smooth and stable spectra. The spectral fluctuation is below 3%, and the voltage fluctuation is less than 0.05%/h.