热控涂层性能在轨测试用辐射计原理样机的设计与仿真

为验证热控涂层性能退化地面模拟试验的有效性,提出了一种利用测热法实现热控涂层在轨测试的辐射计原理样机设计方案.通过对在轨辐射计所接收的外热流进行分析,应用能量守恒原理建立了其测试热控涂层太阳吸收率的数学模型,并在该测试模型的基础上设计辐射计的测热和隔热结构.利用ANSYS软件对辐射计结构的关键组成部分进行了热仿真,并在恒温测试环境下利用辐射计对SR107热控涂层进行了原理验证试验,试验测得的SR107热控涂层太阳吸收率值与该涂层的标定值差别在3%以内,通过分析计算辐射计具有4.2%的测试不确定度.仿真和试验结果表明:辐射计原理样机的设计满足热控涂层性能在轨测试的要求.     

标准传递中日射表光谱误差的模拟计算

工作直接日射表一般都有窗口，而标准直接日射表却没有窗口。校准时，由于窗口都有一定的波长范围，必然会截去部分日射，利用ＬＯＷＴＲＡＮ６对其影响进行了光谱模拟计算。结果表明，石英玻璃窗口的影响不大，相对误差一般均在±１％以内；如果采用ＷＧ２９５窗口，则其影响不容忽视。利用ＬＯＷＴＲＡＮ６并配合Ｉｑｂａｌ方法，对总日射表进行类似的研究表明，窗口对总日射表的影响不像直接日射表那样明显，相对误差一般均不超过±１％。根据光谱计算结果，认为与分光总日射表配合使用的总日射表在校准时，作一标准用的直接日射表应加上ＷＧ２９５窗口，以便与其它分光总日射表的长波端的截止波长一致，否则将会引起１－２％的系统误差。     

全极化微波辐射计系统中高速数字相关器设计

海面风场直接影响大气与大洋环流相互作用,是研究海流运动规律的必要条件.全极化微波辐射计是一种用于海洋表面风场测量的新型被动微波遥感器.数字相关器是全极化辐射计的核心部件.文中详细介绍了一种新型数字相关器的设计和实现.两片高速A/D转换器采样四路信号并通过XILINX公司新一代的FPGA-Vertex5作相关运算.同时本...     

新型多通道微波辐射计及大气观测分析

MWP967KV型微波辐射计是国内第一台自主研发的地基多通道微波辐射计,能够接收和精确测量5毫米和13毫米波段大气辐射强度,可以实时反演出从地面到垂直10km上空高分辨率的大气温湿廓线,而且能探测路径气柱上的水汽和液态水积分总量。本文介绍了MWP967KV型微波辐射计的主要功能、工作原理,并与进口辐射计在不同天气条件下的输出数据进行了对比,结果表明该设备具有优良的工作性能。     

The Present State and Future Prospects for Developing a System for Ensuring Common Standards of Measurement in the Area of Solar Radiation Radiometry

A system for ensuring common standards of measurements of energy illumination produced by solar radiation is considered. The results of many years of international comparisons of a standard absolute radiometer with the standard radiometers and pyrheliometers of other countries are presented. __________ Translated from Izmeritel'naya Tekhnika, No. 11, pp. 72–73, November, 2005.     

Chopped Radiation Measurements With Large Area Si Photodiodes

Frequency dependent response characteristics of photocurrent meters using large area, radiometric quality Si photodiodes have been analyzed. The current responsivity, the voltage noise and drift amplification, and the gain and bandwidth of the photocurrent-measuring analog control loop were calculated. The photodiodes were selected for high shunt resistance. The effect of the photodiode junction capacitance on the response characteristics was also analyzed. As a result of photocurrent gain dependent frequency compensations, the noise boosting effect was minimized at the output of the current meter. The loop gain and bandwidth were maximized. High-accuracy photocurrent measurements can be achieved using the described procedures for both dc and modulated optical radiation.     

3mm波段中频比较辐射计的研究

叙述了3mm中频比较辐射计的工作原理、电路结构、特性分析及实验结果，研究表明，这种辐射计不需3mm开关，其稳定性优于全功率辐射计，而成本和尺寸均与全功率辐射计相差不大，完全可以满足小型化、实用化的需要。     

机载多光谱扫描仪的光谱定标

介绍了机载多光谱扫描仪光谱定标的原理、装置及实验方法,并给出了部分结果与讨论.     

3mm波段Dicke式辐射计的测量研究

阐述了Dicke式辐射计的测量原理、定标方法和测量方法，对几种不同物质表面的毫米波辐射温度进行了测量，给出了大小天线测量结果的对比，为相关的国防及科研提供了理论和技术上的支持。     

The NIST High Accuracy Scale for Absolute Spectral Response from 406 nm to 920 nm

We describe how the National Institute of Standards and Technology obtains a scale of absolute spectral response from 406 nm to 920 nm. This scale of absolute spectral response is based solely on detector measurements traceable to the NIST High Accuracy Cryogenic Radiometer (HACR). Silicon photodiode light-trapping detectors are used to transfer optical power measurements from the HACR to a monochromator-based facility where routine measurements are performed. The transfer also involves modeling the quantum efficiency (QE) of the silicon photodiode light-trapping detectors. We describe our planned quality system for these measurements that follows ANSI/NCSL Z540-1-1994. A summary of current NIST capabilities based on these measurements is also given.