Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Study on calibration method of versatile spectro radiometer
| DOI: | 10.11809/bqzbgcxb2024.05.016 |
| Keywords: | versatile spectro radiometer; calibration; spectro corresponding coefficient; offset coefficient; linear fitting; polynomial fitting |
| Abstract: | In order to accurately calibrate the spectral response function of infrared detectors, the versatile spectro radiometer was calibrated using two point linear calibration method, multi point linear fitting calibration method, non linear polynomial fitting calibration method, and long distance small area source calibration method, respectively. The spectral response coefficient and bias coefficient of the radiometer are calculated. The calibrated radiometer was used to measure the radiance of the blackbody standard source at different temperatures, and compared with the radiance calculated by the blackbody theory. The results show that multi point calibration can reduce random errors caused by noise and system errors caused by nonlinear response. When the temperature range of the measured target is small, it is advisable to use multi point linear fitting calibration to reduce the impact of random errors caused by noise. When the temperature range of the measured target is large, it is advisable to use multi point nonlinear fitting calibration to reduce the impact of system error caused by nonlinear response. When the temperature of the measured target is high, the spectral radiation is included in the signal at the pupil, and it is advisable to use the remote small area source method for calibration, with a measurement error of less than 2%.The testing accuracy after calibration is better than similar instruments at home and abroad. |
| Published: | 2024-05-31 |