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研究了一种简单实用的光学探测器非线性系数测量方法。采用两颗红外发光二极管(LED),配用数字源表控制LED光源的开关和驱动电流值,通过光束叠加法在4个数量级内实现在特定红外波长上光学探测器非线性系数的测量,波长位置由LED发光峰决定。采用红外940 nm LED,在恒温实验室条件下,进行了LED持续点燃的稳定度的研究。当点燃时间在1 min到10 min内,光源到达探测器的辐射通量变化的相对标准偏差值不大于0.022%。进行了重复条件下红外LED辐射通量水平复现性的考察。短时间内重复点燃10次,辐射量值变化的相对标准偏差不超过0.044%。进行了校准结果的测量不确定度评定,基于940 nm LED的非线性系数校准结果的扩展不确定度为0.07%(k=2)。
A simple and practical optical detector nonlinear coefficient measurement method is studied. Using two infrared light-emitting diode (LED), with a digital source table to control the LED light source switch and drive current value, by beam superposition method in 4 orders of magnitude at a specific infrared wavelength of optical detector nonlinear coefficient of measurement, wavelength Location by the LED luminescence peak decision. Using the infrared 940 nm LED, under constant temperature laboratory conditions, the study of the stability of LED sustained ignition. When the ignition time is 1 min to 10 min, the relative standard deviation of the variation of the radiant flux of the light source reaching the detector is not more than 0.022%. The reproducibility of the infrared LED radiation flux under repeated conditions was investigated. Repeatedly ignited 10 times in a short period of time, and the relative standard deviation of the change in the amount of radiation did not exceed 0.044%. The measurement uncertainty of the calibration results was assessed. The extended uncertainty based on the non-linear calibration of 940 nm LEDs was 0.07% (k = 2).