Electricity substituted absolute radiometer

Abstract

The present invention relates to an electric substitution absolute radiometer which comprises a heat sink, a narrow slit, a shutter, a radiation-absorbing material, a heating wire, a substrate, a thermistor and a low-heat conducting suspension system; the substrate adopts the material with high heat conductivity, high insulating property and low heat capacity, the radiation-absorbing material, the heating wire and the thermistor respectively contact and are fixed on the surface of the substrate to form a primary radiation detecting chip; one end of the low-heat conducting suspension system is tightly bonded with the heat sink; and the primary radiation detecting chip is fixed to the other end of the low-heat conducting suspension system. The invention has the advantages of simple structure, small time constant, shortening the measuring period, high measuring efficiency, high measuring precision, high sensitivity and being able to be used as a novel embedded scaling reference source on the space remote sensing device; as the measuring precision of the miniature absolute radiometer is high and the long-term stability is good, the on-satellite scaling precision of the space remote sensing device can be increased by a magnitude. The broader usage of the invention is that the radiometer can be taken as the optical spectrometer scaling device of the ground measurement department.

Description

technical field [0001] The invention belongs to the field of optical radiometric measurement, and relates to an electrical substitution absolute radiometer, in particular to a spectrometer calibration device and a new built-in calibration reference source on an aerospace remote sensing instrument that can be used by ground metrology departments. Background technique [0002] The measurement principle of the absolute radiometer is to use photoelectric equivalence to compare the thermal effect of the unknown irradiance irradiated on the absolute radiometer with the thermal effect of the known electric power (measurement of heating voltage and resistance), so that the electric power of heating is equivalent to the received The radiation power is calibrated by the electric power reproduction method. The main applications of absolute radiometers are in metrology departments as radiation references and on spacecraft to monitor changes in total solar irradiance. [0003] At presen...

AI Technical Summary

Problems solved by technology

This kind of conical cavity detector has large volume and large heat capacity, and the heat conduction between the conical cavity and the heat sink is slow, so the time constant of the radiometer is long, and the time to complete a measurement is long (1.5-3min); the heating wire resistance is small, and the lead resistance The impact is large, affecting the measurement accuracy of the radiometer; the sensitivity of the thermopile ring is low, and the minimum detectable power of the radiometer is large

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