Radiation detector based on flat plate substrate

Abstract

The present invention relates to a radiation detector basing on the flat-plate substrate; the detector comprises a substrate, a radiation-absorbing material, a thermistor and a heating wire; the substrate adopts the material which has the advantages of high heat conductivity, high insulating property and low heat capacity; the heating wire and theremistor respectively contact and are fixed on the surface of the substrate, the radiation-absorbing material is arranged at the upper side of the heating wire, and an insulating layer is used for insulating between the heating wire and the radiation-absorbing material. The invention has the advantages of small volume, small heat capacity; the electric impedance of the heating wire is large and the effect of electric impedance of the wire lead can be ignored; the sensitivity of the thermistor is high and the dynamic area can be detected is large, the radiation detector can be taken as the novel embedded scaling reference source on the spacecraft and can also be applied to other thermal radiation detecting field.

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 flat substrate-based radiation detector for measuring solar radiation on a satellite. Background technique [0002] The measurement principle of the absolute radiometer is to use the 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 (measure the heating current intensity and voltage), so that the heating electric power is equivalent to Received radiated power, calibrated with the method of electrical power reproduction to calibrate the radiation scale. A major application of absolute radiometers is monitoring changes in total solar irradiance onboard spacecraft. [0003] At present, the absolute radiometer mainly adopts double-cone cavity electric replacement compensation type, suc...

AI Technical Summary

Problems solved by technology

This kind of conical cavity detector has large volume and large heat capacity, so the heat conduction between the conical cavity and the heat sink shell is slow, 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 wire The influence of resistance is large, which affects the measurement accuracy; the sensitivity of the thermopile ring is low, and the minimum detectable power is large

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