紫外ICCD的辐射定标

Radiometric calibration of ultraviolet ICCD detector

为保证紫外探测所得数值结果的准确性并为电力电晕探测等应用提供直接的技术支持,对UV-ICCD的辐射定标技术进行了研究,以建立靶面输入辐照度和探测器数字化输出之间的响应特性关系。推导了辐射定标的原理,并基于标准氘灯对UV-ICCD探测器进行了辐射定标,其标准光源由美国国家标准和技术研究所(NIST)标定,不确定度为5%。在固定积分时间和固定MCP增益情况下,实验标定了UV-ICCD探测器的响应以及UV-ICCD探测器响应与MCP增益之间的关系。初步的定标数据显示,UV-ICCD探测器的响应是线性的,MCP增益与输出图像的平均灰度值成正比。最后,对影响定标结果不确定度的来源进行了分析,结果表明,辐射定标的最大不确定度约为7.94%,满足<10%的定标要求。

The radiometric calibration for UV-ICCD was investigated to build the relationship between the input irradiance and the digital output. The theory of radiometric calibration was derived and the radiometric calibration of the UV-ICCD was implemented based on spectral irradiance standard deuterium lamp with uncertainty of 5% calibrated by NIST in a laboratory. Under the conditions of fixed MCP gain and fixed integration time, the response of the UV-ICCD was tested and the relationship of the response and the MCP gain was studied. The preliminary analysis of calibration data shows that the response of UV-ICCD is linear and the MCP gain is directly proportion to the average grey value of image. Finally, the uncertainty influencing the calibration results was analyzed, the analysis shows the maximal uncertainty is 7.94% ,which can meet the calibration requirement less than 10%.