High-precision calibration measurement method for infrared spectral radiation characteristics of long-range target

This Addressing the bottleneck issues such as the large infrared radiation dynamic range of aircraft plumes, the irregular multi-angle geometric shapes of jets, and the difficulty of long-range measurements, research on long-range high-precision infrared radiation calibration methods based on infrared spectroradiometers is conducted. The study delves into high dynamic range full-field-of-view multi-segment calibration methods and aperiodic transfer function (ATF) calibration methods for distant targets, ultimately establishing a set of high-precision radiometric calibration methods. The multi-segment spectral radiation calibration method combines the optical gain of the testing system, spectral splitting response, integration time, upper limit of dynamic measurement range, and the detectable radiation energy per pixel. This model quantitatively describes the nonlinearity of detector output and the measurement errors introduced by inaccuracies in the characteristic spectral segments. Moreover, this paper fully considers the point source image spot size and aberration diffraction point spread characteristics of the target in the detection unit of the infrared spectroradiometer. A high-precision calibration model for the ATF of the spectroradiometer is established to achieve high-precision calibration of the spectroradiometer. The research results will provide technical support for establishing comprehensive and accurate methods for infrared spectral radiation testing and evaluation.