Three-cavity blackbody radiation source for measuring emissivity

Abstract

The invention discloses a three-cavity blackbody radiation source for measuring emissivity. The three-cavity blackbody radiation source comprises a liquid thermostat for holding a liquid medium inside, blackbody cavity shells, a temperature control device and a standard thermometer; the number of the blackbody cavity shells is three; the blackbody cavity shells consists of cavities with conical front ends and cylindrical rear ends; the internal walls of the blackbody cavity shells are coated with coatings of high-emissivity painting; the liquid thermostat is internally provided with the temperature control device, and three grooves which are conical at the front ends and cylindrical at the rear ends are in equal intervals and in the same size; three blackbody cavity shells are respectively arranged in the grooves which are the same with the blackbody cavity shells in shape; the external side of the liquid thermostat is fixedly connected with the external cylindrical surfaces of the cylindrical cavities with three openings; and the standard thermometer is arranged in the liquid thermostat. According to the three-cavity blackbody radiation source for measuring emissivity, the number of the blackbody cavities is increased, and the emissivity of three different samples to be measured can be measured at the same time; the data of the sample to be measured, a standard sample and a radiation source can be timely contrasted. And the blackbody cavities can be detached and are convenient to place samples.

Description

technical field [0001] The invention relates to an emissivity measurement device, in particular to a three-cavity blackbody radiation source used for emissivity measurement. Background technique [0002] Emissivity is one of the important bases for measuring the radiation ability of thermal radiators. Researching and measuring the emissivity of objects has important practical significance for revealing the thermal radiation characteristics of materials, improving radiation heating efficiency and finding new ways to save energy. In the field of national defense, the cognition of the launch rate of missile flame and skin is the key to military early warning, guidance and stealth. The acquisition of target emissivity data is the basis of remote sensing and radiation temperature measurement, which directly determines the measurement uncertainty. [0003] Emissivity is a rather complex parameter, and the temperature, wavelength, surface condition, emission angle, polarization st...

AI Technical Summary

Problems solved by technology

When measuring the emissivity of materials, the single-cavity blackbody radiation source used in the past cannot measure multiple samples to be tested at the same time, and cannot perform real-time data comparison with the three sets of data of the standard sample, the sample to be tested, and the standard blackbody radiation source. There is a problem of poor timeliness. question

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