Abstract
Spectroradiometers exhibit the smallest aberration and the optimum response at the field-of-view (FOV) center. The aberration increases and the response deteriorates at positions further away from the FOV center, which leads to nonuniformity in the spectroradiometer FOV. In this study, a concentric-circles method for correcting the spectroradiometer FOV nonuniformity was developed. The calibration experiment for FOV nonuniformity was conducted by establishing the experimental platform. The nonuniformity correction coefficients were obtained and then used to fit the correction function curve within the whole FOV, allowing for correction of measurement targets with an arbitrary shape. The radiation intensity of the blackbody at different temperatures was obtained by measurement, and the nonuniformity coefficient was used to correct it. After correction, the error was within 1.84% for the spectrally integrated radiant intensity in the non-absorption band. Using this correction method, efficient calibration of spectroradiometer nonuniformity can be achieved, thereby enhancing the measurement accuracy of the spectroradiometer.
Highlights
Fourier-transform infrared (FTIR) spectroscopy has found increasingly extensive applications in environment monitoring, pollution prevention and control [1,2,3], infrared target detection for the military [4,5,6,7], atmospheric transmittance measurement, and other fields [8,9,10,11]
A Fourier infrared spectroradiometer can obtain the spectral radiation characteristics of a source, but its measurement results generally differ considerably from those calculated under ideal conditions
When the target to be measured deviates from the FOV center or occupies a major part of the spectroradiometer FOV, the radiation measurement results contain considerable errors compared to the theoretical values
Summary
Fourier-transform infrared (FTIR) spectroscopy has found increasingly extensive applications in environment monitoring, pollution prevention and control [1,2,3], infrared target detection for the military [4,5,6,7], atmospheric transmittance measurement, and other fields [8,9,10,11]. At positions further away from the optical axis, aberration may result in different responses from the spectroradiometer for the same target at different FOV positions. The error between the corrected test result and the spectral radiant intensity calculated under ideal conditions was reduced This method requires the acquisition of the target radiation source’s test and theoretical radiation values, which are used to obtain the correction coefficient. It does not explain the specific law of nonuniformity. SSppeeccttrroorraaddiioommeetteerrss eexxhhiibbiitt mmiinnoorr aabbeerrrraattiioonn aanndd aann ooppttiimmuumm rreessppoonnssee aatt tthhee FFOOVV cceenntteerr.
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