近红外光源稳定控制系统及应用研究

发布时间：2018-02-24 23:17

本文关键词： 近红外光源稳定控制稳流源光谱仪积分球辐射定标光源　出处：《吉林大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文针对近红外光谱仪以及辐射定标光源的应用需求，设计了近红外光源稳定控制系统，根据不同的应用，使用不同的控制方式，最终实现光源输出光强稳定均匀。由于电流比电压对光功率的影响较大，故使用稳流源作为光源的驱动电源，稳定控制系统控制稳流源为20W或50W的卤钨灯提供稳定的电流，电流范围是0A~5.0000A,电流的不稳定度小于0.06%。等效型近红外光谱仪针对不同的样品，利用等效测量的方法通过光源系统的亮度可调稳流单元调节控制光谱仪的20W卤钨灯的电流大小（0~1.6667A），使光源稳定输出不同的光强度，通过实验测量出不同的等效光谱数据，光信号不稳定度小于0.1%。为了实验室光谱测量仪器辐射定标中提供稳定均匀的辐亮度光源，研制了一整套积分球辐射定标光源。其结构组成包括近红外光源稳定控制系统、等色温连续调光装置和积分球。其中，稳定控制系统包括STM32微处理器、电信号采集单元、稳流控制单元、光电探测单元、电信号的设定与显示单元等。稳定控制系统利用等色温调光装置，通过步进电机带动光栏转盘控制进入积分球入光口的光通量，保持积分球出光口能够等色温连续调节输出稳定的光谱辐亮度。经测试实验得，辐射定标光源输出的辐亮度范围是0~2000cd/m2，非均匀性是0.5%，不稳定性是0.35%，完全可满足设计需求。
[Abstract]:In order to meet the requirements of near infrared spectrometer and radiation calibration light source, a stability control system of near infrared light source is designed in this paper. According to different applications and different control methods, the light source output intensity is stable and uniform. Because the current ratio voltage has a great influence on the optical power, the stable current source is used as the driving power source of the light source. The stable control system controls the stable current source of 20W or 50W halogen tungsten lamp to provide the stable current. The current range is 0 A / V 5.0000A, and the instability of the current is less than 0.06. The equivalent near infrared spectrometer is used to control the current of the 20W halogen tungsten lamp of the spectrometer by using the method of equivalent measurement through the brightness adjustable and steady current unit of the light source system, so that the light source can output different light intensity stably. Different equivalent spectral data are measured experimentally. The optical signal instability is less than 0.1. In order to provide a stable and uniform radiance light source in the radiometric calibration of laboratory spectrometer, a whole set of integrated sphere radiation calibration light sources has been developed. Its structure consists of a stability control system of near infrared light source. Constant color temperature continuous dimming device and integral sphere. The stability control system includes a STM32 microprocessor, an electrical signal acquisition unit, a steady current control unit, and a photoelectric detection unit. The stable control system uses the same color temperature dimming device to control the flux of light entering the integrated sphere through the step motor driving the optical bar turntable. The measurement results show that the radiation calibration source output radiance range is 0 ~ 2000cd/ m ~ 2, the nonuniformity is 0.5cm / m ~ 2, and the instability is 0.35. it can completely meet the design requirements.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP273;TN219

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