光学学报, 2019, 39 (6): 0612003, 网络出版: 2019-06-17
宽动态范围辐射测温系统的简化定标方法 下载: 792次
Simplified Calibration Method for Radiation Temperature Measurement System with Wide Dynamic Range
测量 辐射定标 宽动态范围 简化方法 中性密度衰减片 measurement radiation calibration wide dynamic range simplified method neutral density attenuator
摘要
在宽动态范围辐射测温系统中,不同温度的辐射源采用透过率不同的中性密度衰减片以及不同的积分时间,往往需要重新定标,且重新定标过程繁琐,降低了系统的效率。在分析定标理论的基础上,建立了考虑积分时间和中性密度衰减片透过率的宽动态范围辐射定标模型,提出了一种简化的定标方法,经过两次不同积分时间的定标,可以推导出前置不同透过率衰减片、不同积分时间的定标模型;通过对前置透过率为0.0278%的衰减片在0.8 ms及1 ms积分时间下的定标分析,计算出系统由内部暗电流及杂散辐射引起的灰度响应,从而分别推导出前置透过率为0.0740%和0.8193%的衰减片在不同积分时间下的定标模型,最后通过实验检验定标模型的测温精度。实验结果表明:利用所提出的简化定标方法,透过率为0.0740%的衰减片在0.8 ms及1 ms积分时间下的定标模型的测温误差分别≤0.36%和≤0.46%;0.8193%衰减片在0.2 ms积分时间下的测温误差≤4.5%。在一定的误差允许范围内,所提定标方法在提高定标效率的同时,保证了一定的测温精度。
Abstract
The radiation temperature measurement system with a wide dynamic range requires different integration time and neutral density attenuators with different transmittance levels for the radiation sources exhibiting different temperatures. The attenuators and integration time often need to be re-calibrated because of their variation. The re-calibration process is cumbersome, and thus the efficiency of the whole system is reduced. First, based on the calibration theory, a radiation calibration model of the radiation temperature measurement system with a wide dynamic range is developed herein. This model considers the integration time and the transmittance of the neutral density attenuators. A simplified calibration method is also proposed to realize the calibration models of attenuators having different radiation transmittance at different integration time. Two different integration time are calibrated using the proposed method. Then, the gray value response of the system caused by internal dark current and stray radiation is calculated by calibrating at integration time of 0.8 ms and 1 ms using an attenuator having 0.0278% transmittance. Therefore, the calibration models of the attenuators having 0.0740% and 0.8193% transmittances at different integration time can be derived. The precision of temperature measurement is experimentally tested. The experimental results indicate that using the proposed calibration method, the maximum temperature measurement errors of the calibration model for the 0.0740% attenuator at integration time of 0.8 ms and 1 ms are ≤0.36% and ≤0.46%, respectively, and that for the 0.8193% attenuator at integration time of 0.2 ms is ≤4.5%. As for the proposed method, within a certain error range, the calibration efficiency is improved and a certain precision of temperature measurement is guaranteed.
马冬晓, 汪家春, 陈宗胜, 王冰, 刘洋. 宽动态范围辐射测温系统的简化定标方法[J]. 光学学报, 2019, 39(6): 0612003. Dongxiao Ma, Jiachun Wang, Zongsheng Chen, Bing Wang, Yang Liu. Simplified Calibration Method for Radiation Temperature Measurement System with Wide Dynamic Range[J]. Acta Optica Sinica, 2019, 39(6): 0612003.