Development Of The Mid-infrared Energy Comparative System

Our country is one of a few of the countries which can independently completethe work of satellites launch in the world. With the development of science andtechnology, especially the development of space exploration technology, thequantitative requirements of the satellite data are more and more pressing. But theutilization of satellite data in our country is less than5%of the obtained amount,which is in restriction. To study the reasons, that the evaluation theories and theevaluation characteristics of the calibration blackbody radiation characteristics areimperfect, is one of the main reasons which restrict on the data utilization on satellites.Therefore, that calibrate blackbody radiation characteristics on the calibration systemon satellites is very important.Now, the researches of the blackbody emissivity have been stayed at thetheoretical stage. Especially for the large diameter area blackbody, there is still nopractical and reliable assessment method in China. Furthermore, the research of thelow temperature blackbody radiation characteristics calibration is still underway inChina. In response to this situation, the paper puts forward the energy comparedmethod to measure the emission rate of calibration blackbody on the satellite—thelow temperature area blackbody, then establishes the mid-infrared energy system. Thepaper mainly studies the following aspects.Firstly, based on the three blackbody radiation laws, summarizing and studyingthe existing assessment theory of the blackbody radiation characteristics and theblackbody radiation calibration devices, combined with the actual situation of thissubject, the paper uses the energy compassion method which is frequently used ininternational to measure the emissivity of the blackbody, then puts forward themathematical model of emissivity transfer.Secondly, according to the mathematical model of emission rate transfer, thepaper puts forward the overall program of the mid-infrared energy comparative system,and builds the hardware platform of the system, including the system of optical transfer,the modulation plate, the front amplifier, the lock-in amplifier and the system of rangecontrol, and so on. Then write the measurement and data processing software of thesystem with LabVIEW2010.Finally, the emissivity transfer experiments in order to test the emissivity of thelow temperature area blackbody with the comparative system were done at differenttemperatures in the temperature range. According to the data from the transfer experiments, emissivity of the low-temperature area blackbody is0.930which agreesthe range of theoretical calculation. And the uncertainty of the emissivity transmissionis0.7%, which is less than1%.