Survey of dual waveband colorimetric temperature measurement technology

Radiation thermometry is one of the important ways to obtain target temperature, which mainly includes dual-waveband colorimetric temperature measurement. The precision is limited by atmospheric transmittance and the air path radiation when infrared signature of a target measured in the atmosphere. To increase the precision, a correction-based dual-waveband color comparison thermometric method is presented, which puts a reference blackbody next to the target for comparison. Due to colorimetric temperature measurement curve is non-linear, a new method that uses piecewise linear method to fit it, which uses the zero point of first derivative of absolute error that determine the maximum error. It has fewer segments and high fitting precision. Non-contact temperature measurement which uses the two-color thermometry based on CCD image sensor is recently presented. The main error sources come from the change in emissivity of a measured object with the wavelength and the non-ideal CCD spectrum response characteristic. Thus, an improved method is proposed, which is independent of the spectroscopic characteristics and the representative wavelengths of the CCD.