Research On The Delivery Systerm Of Area Blackbody Emission Rate

With the vigorous development of China’s space industry，not only the number oflaunched satellites increased a lot and the performance continued to improve, but alsothe types got more and more. Among these satellites, remote sensing satellites haveadvanced rapidly in recent years, the remote sensing technology has matured, too. Butcompared to the United States, Russia and other space powers, China’s remote sensingtechnology is to be improved, and there is still large room for the improvement ofutilization on the data from the remote sensing satellites. Satellite remote sensing andinfrared devices need blackbody’s calibration, so the research on blackbody has greatsignificance. But our blackbody’s calibration technique is not perfect, especially thelarge-diameter area blackbody. Therefore，there is an urgent need to establish somerelatively perfect calibration techniques on the calibration of area blackbody radiationcharacteristics. This paper gives the transmission system of area blackbody emissionrate, it is an exploratory in the field of the blackbody calibration, and striving to create anew direction for the area blackbody calibration techniques. This research is based oncomparison method, comparatively test infrared energy of the area blackbody and cavityblackbody, and under the guidance of the basic theory of blackbody radiation, establisha kind of area blackbody emissivity value transfer mathematical model, and based onthe emission rate of standard cavity blackbody, to traceability the emission rate of areablackbody.This system on this paper consists of three subsystems: the temperature controlsystem of standard cavity blackbody, the temperature control system of area blackbodyand an energy test comparison system. Firstly, establish two temperature controlsystems of the area blackbody and cavity blackbody, and have the comprehensive testson the temperature characteristics of two blackbodies, to ensure that the temperaturecharacteristics of two blackbodies meet the technical requirements, and ensure theaccuracy on the two blackbody radiation energy test follow-up; then establish aninfrared energy test matching system, and ensure that in this system could test theenergy of two blackbodies in low and normal temperature range. In the sameexperimental conditions, temperature and the environment, use the energy detection testsystem to receive the infrared radiation energy of two blackbodies. Combined with theweak signal processing theory and digital lock-in amplifier, have the signal processing.Lastly, record experimental data and in accordance with the value transfer model whichis based on the theoretical, calculate the area blackbody emission rate, and give theanalysis of the passing uncertainty. After a number of experiments and analysis of error and uncertainty on the resultsof data, the temperature characteristics of the area blackbody and cavity blackbody arein line with the project specifications, and the two temperature control systems meet theaccuracy and stability requirements, the temperature uniformity of area blackbody meetthe technical indicators basically, which are able to ensure the accuracy on the test ofblackbody radiation; and based on the passing model, the emission and passinguncertainty of area blackbody are also in line with the technical indicators, the passingmathematical model meets the requirements of the emission rate on the measurementaccuracy and uncertainty, so this system and the study has a positive meaning for thedevelopment of blackbody calibration techniques.