基于长波红外探测器绝对光谱响应度测量的激光源

为满足长波红外探测器绝对光谱响应度参数的高准确度测量要求,提高长波红外激光的功率稳定性,优化激光光束质量,研制了一套长波红外激光源。针对CdTe晶体的电光效应设计了一套提高长波红外激光功率稳定性的实验系统。利用激光光束传输原理设计了长波红外波段空间滤波器,并分析了其各项参数的计算方法。实验结果表明:长波红外激光的光功率不稳定度提升至0.1%以上,长波红外激光的光束质量也得到显著提升,满足了长波红外探测器绝对光谱响应度高准确度测量对光源的性能要求。     

基于低温辐射计的陷阱探测器红外绝对光功率响应度的定标

采用低温辐射计在1064nm波长对两个硅陷阱探测器（trap 0#和trap B）进行绝对光功率响应度定标。描述了定标方法、实验装置和数据的分析方法,提出了低温辐射计窗口的精确复位和窗口透过率的测量方案,测量得到的透过率达到0.999以上。结果表明,两个探测器绝对响应度定标的合成不确定度分别为1.457×10-4和1.458×10-4,定标结果的重复性分别达到了0.014％和0.008％。分析了测量时各项不确定度来源,对光功率响应度定标不确定度进行了评估。最后对0＃硅陷阱探测器在1064nm波长处光功率响应度的温度稳定性进行了测试研究。     

红外探测器光谱响应测量系统

用迈克尔孙干涉仪及辅助检测平台建立了红外探测器光谱响应测量系统。利用计算机技术对被测红外探测器接收到的干涉图进行了傅里叶变换,得到了相对响应于入射波长的光谱响应曲线,并采用同时检测参考探测器光谱响应的方法,通过比较及运算,消除 了背景光谱的影响。     

红外探测器光谱响应自动测试

介绍红外探测器相对光谱自动测试方法。通过软件编程实现功能选择。利用双路锁相放大器跟踪测量信号，微机自动扫描、采集和处理数据，实现了红外探测器光谱响应的自动测试。文中给出了整个测试过程的流程图。我们对影响测试精度的因素，如在ＨＲ６４０光谱仪的入射、出射狭缝前后和其它配置上采取了一些改进措施，使本装置具有特色，提高了测试精度。文中给出测试实例。测试结果表明，此装置已能满足红外探测器测试标准所要求的精度。     

红外激光辐照下光电探测器光谱响应度的研究

响应度R是反映探测器性能的一项重要指标.当光电探测器被激光损伤后,其响应度R将会下降.文中探讨了强激光对光电探测器的损伤机理,对不同功率密度强激光作用下探测器的光谱进行了测量,研究了探测器在强激光辐照下探测器响应度变化规律.对光电对抗以及光电探测器的抗激光损伤研究具有一定的参考价值.     

由光谱响应选择红外探测器滤光片

通过对SPR制冷型InSb红外光伏探测器相对光谱相应的测试及滤光片透过率谱的测试,发现了场镜、滤光片、红外探测器组合件的光谱响应同滤光片技术条件的关系和差别.     

红外探测器相对光谱响应率的自动测试

介绍红外探测器相对光谱响应率自动测试的实施方法。利用锁相放大器追踪测量信号,微机自动扫描、采集和处理数据。给出了整个测试过程的流程图,对影响测试准确度的因素,如光源、参考探测器及其他干扰进行了较详细的阐述。并介绍提高测试准确度的措施,给出测量实例及误差分析。测试结果表明,此装置已能满足红外测试标准所要求的精度。     

探测器绝对响应率的定标

本文简要回顾了探测器绝对响应率定标中所涉及到的基本标准、标准传递和标准实现问题。     

集成光电探测器绝对光谱响应度的研制

分析了光电探测器的结构及光谱响应度的测试原理,基于LabVIEW图形化软件,研制了一套0.2～1.1 μm的光电探测器绝对光谱响应度测试装置.本系统采用单光路小光点标准替代法进行测量,系统组成灵活并可扩展,配合自行研制的驱动电路和采样保持电路,可以满足不同器件的需要.采用本系统对上海技物所研制的多种集成光电探测器的绝对光谱响应度进行测试,测试结果表明了系统的可行性.     

Model for accurate speed measurement using double-loop detectors

Vehicle speed is an important parameter in measurements of road traffic. At present, double-loop detectors are generally used for vehicular speed measurement. However, these detectors incur errors caused by scanning time, spacing between double loops, irregular vehicle trajectories, and the presence of multiple vehicles in the detection zone. This paper suggests a new model that uses an error-filtering algorithm to improve the accuracy of speed measurements. In the field tests, all percent errors of the vehicular speeds measured by the proposed model were within the error tolerance limit (/spl plusmn/5%). Furthermore, the variance of percent errors was reduced. Therefore, it can be concluded that the proposed model significantly improves vehicle-speed-measuring accuracy.     

溯源于低温辐射计的1064nm波段探测器绝对光谱响应度定标

标准传递探测器在红外波段的绝对光谱响应度定标不确定度较大且难以降低,其主要影响因子是窗口透过率的测量不确定度,该项因子是由布儒斯特窗口的状态复现引入。给出了陷阱型标准传递探测器在1 064 nm波段溯源于低温绝对辐射计的定标实验过程和结果。介绍了低温辐射计新型Y型定标光路,该光路消除了低温辐射计窗口反射损耗引入的不确定性。实验测试了探测器在1 064 nm波段的线性、空间响应均匀性、稳定性和空间偏振非敏感性。结果表明:传递探测器绝对光谱响应度定标的不确定度优于0.023%,响应度重复性的实验结果表明了Y型低温辐射计定标光路改造的可行性。     

Temperature dependence of responsivity in closely compensated extrinsic infrared detectors

Extrinsic infrared detectors which have closely compensated residual impurities shallower than the major dopant exhibit a large temperature dependence of the responsivity caused by changing occupation of these levels. A model is developed and its behavior is explored using indium-doped silicon as an example. The temperature dependence of the responsivity at low temperatures is found to be a series of plateaus for each overcompensated level. When exact compensation occurs, a unique peak of very high responsivity is predicted. The model is fitted to published Si: In detector data exhibiting such a series of plateaus and good agreement is found.     

中红外波段可调谐液晶法布里珀罗高光谱成像探测仪

提出了一种新颖的方法来研究电控可调谐液晶法布里珀罗高光谱成像探测器,该设备将用于3~5 m波段范围内连续挑选特定波长,液晶指向失会受到加在设备电极两端的电压说产生的电场影响,基于这个理论,腔内的液晶折射率能够被电控。通过运用薄膜的矩阵传输公式,计算了感光面上的红外透过率,从而得到了透过率,外加点信号,以及挑选波长之间的关系。最重要的理论是设备将由两个法布里珀罗干涉仪紧密连接起来,分别受电控制,从而达到准确的在波段范围挑选单一波长的目的。     

基于高温黑体的傅里叶光谱测量系统响应度分段线性标定

傅里叶红外光谱仪（FTIR）光谱响应度的标定工作是FTIR红外光谱精准测量的基础。基于中国计量科学研究院（NIM）的ThermoGage HT9500型高温基准黑体辐射源,对NIM搭建的FTIR高温黑体红外辐射特性测量系统的光谱响应度,通过分段线性标定法进行了标定实验。建立并描述了FTIR测量高温黑体红外辐射特性系统响应度函数标定模型,并通过测量的黑体辐射源在1 273~1 973 K温区、1~14 m宽频谱内的红外光谱,对FTIR测量系统的光谱响应度进行了标定实验研究。结果表明:分段线性标定FTIR红外光谱测量系统方法具有良好可靠性。1 373~1 873 K温区的测量光谱与基于黑体标定的计算光谱在1~14 m频谱内平均偏差优于1%,黑体光谱辐射亮度峰值波长上反演得到的黑体计算温度与实际温度偏差优于0.45%。     

Temperature dependence of the EUV responsivity of silicon photodiode detectors

Responsivity of silicon photodiodes was measured from -100 C to +50 C in the 3 to 250 nm wavelength range using synchrotron and laboratory radiation sources. Two types of silicon photodiodes were studied, the AXUV series having a thin nitrided silicon dioxide surface layer and the SXUV series having a thin metal silicide surface layer. Depending on the wavelength, the responsivity increases with temperature with the rates 0.013%/C to 0.053%/C for the AXUV photodiode and 0.020%/C to 0.084%/C for the SXUV photodiode. The increase in responsivity is consistent with the decrease in the silicon bandgap energy which causes a decrease in the pair creation energy. These results are particularly important for dose measurement in extreme ultraviolet (EUV) lithography steppers and sources since the detector temperature often increases because of the high EUV intensities involved.     

Theoretical and experimental responsivity of fir antenna coupled metal-insulator-metal detectors

In this work we report a complete theory of the metal-insulator-metal, antenna coupled, mm and sub-mm detectors. The voltage-power responsivity is simply derived from the geometrical antenna proprieties and the electrical junction characteristics. The calculated responsivity simply foresees our experimental results in the sub-mm — mm range and well fits all the previously reported data     

Theoretical and experimental responsivity of fir antenna coupled metal-insulator-metal detectors

In this work we report a complete theory of the metal-insulator-metal, antenna coupled, mm and sub-mm detectors. The voltage -power responsivity is simply derived from the geometrical antenna proprieties and the electrical junction characteristics. The calculated responsivity simply foresees our experimental results in the sub-mm — mm range and well fits all the previously reported data     

基于光通量倍增法的傅里叶红外探测系统光谱响应度非线性测量

在宽动态范围、高分辨力、宽频谱红外辐射测量中,傅里叶变换红外光谱仪(FTIR)是常用的探测单元,其光谱响应度的非线性是宽动态范围红外光谱测量的不确定度主要贡献项之一。基于光通量倍增原理,建立傅里叶红外光谱探测系统的非线性测量实验系统。实验研究了在非线性测量典型时间段内的黑体辐射源和FTIR红外光谱探测系统的漂移特性,设计了测量序列变换模型来消除测量过程中的一阶线性漂移影响。在200～1 000℃范围内,实验测量了FTIR红外光谱探测系统的非线性特征,给出了在典型波长3.9μm和10.6μm处的非线性测量结果及相应的不确定度。