Calibration method and calibration system for surface source blackbody temperature accuracy

Abstract

The invention is applicable to the field of temperature correction, and provides a calibration method for surface source blackbody temperature accuracy. The method comprises the following steps that A, M different calibration temperature points are selected in the set temperature range of a surface source blackbody; B, a metering standard platinum resistance temperature indicator is utilized for carrying out temperature measurement on the surface source blackbody radiation source at each calibration temperature point through calibration holes, the real temperature value Ti is obtained, and in addition, the radiation temperature ti of the corresponding surface source blackbody per se is recorded; C, the radiation temperature of the surface source blackbody per se of each calibration temperature point is subjected to linear fitting with the real temperature value measured by the metering standard platinum resistance temperature indicator, and correction factors are calculated; and D, correction factors are utilized for correcting the temperature of the surface source blackbody. The calibration method aims at further correcting the nonlinear error of a platinum resistance temperature measuring system, the measurement precision of the whole system is improved in the full temperature range, the calibration precision of the surface source blackbody radiation temperature accuracy is improved, and the high-precision testing requirement is met.

Description

technical field [0001] The invention belongs to the technical field of temperature correction, and in particular relates to a method for calibrating the temperature accuracy of a surface source blackbody and a calibrating system thereof. Background technique [0002] As a basic instrument for infrared testing and calibration, the high-precision surface source blackbody infrared radiation source can fill the field of view with emitted radiation, which is convenient for calibration and measurement, and can improve the accuracy of measurement and calibration. The demand is very large and it has broad application prospects. The surface source black body uses platinum resistance temperature sensor to control and measure the temperature of the radiation surface, amplifies the voltage of platinum resistance measured by the unbalanced bridge with temperature changes, and then inputs it into A / D for conversion, using the functional relationship between resistance and temperature The ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for calibrating the accuracy of surface source blackbody temperature and its calibration system, aiming to calibrate the surface source blackbody temperature in the prior art using a two-point correction algorithm based on the two ends of the blackbody radiation temperature. The problem of poor accuracy in practical applications

Images