Study on Correcting the temperature measurement of Infrared Thermography by Determining the Atmospheric Transmittance

The factors that effect the surface temperature measurement of planes using infrared thermography were analyzed based on the theory of infrared radiation. The blackbody is normally used as a measurement standard to calibrate the infrared thermography. Because the atmosphere has an affect of absorption on the infrared ray, while all the measurement as well as blackbody can not avoid transmitting through the atmosphere, so that the affect brought by the atmospheric transmittance becomes a main factor that effects the measurement on blackbody. And the influence caused by the atmospheric transmittance was mainly discussed. Meanwhile, a set of experimental taking blackbody as measured target has been done to discover the principle of error during the measurement. And the atmospheric transmittance can be calculated through the experiment results. Furthermore, the calculated value was used to compensate the error caused by the atmosphere. Compare the calibrated results with before, the measurement errors significantly reduced. Then the accuracy of measurement has been improved. Finally, a way of setting blackbody as a measurement standard was proposed to compensate the error brought by atmosphere.