Abstract
Aiming at the problem wherein temperature inversion accuracy is unstable due to the major differences in atmospheric transmittance under various observation paths, a method for measuring radiation characteristics of an aircraft engine’s hot parts and skin using a cooled middle-wave infrared camera is proposed. Based on the analysis of the aircraft’s infrared radiation characteristics, the atmospheric transmission model of any observation path was revised, the absolute radiation correction model was established, and the temperature inversion equation was calculated. Then, we used the quasi-Newton method to calculate the skin temperature and discussed uncertainty sources. After the theoretical study, an outfield test was carried out. A middle-wave infrared camera with a wavelength of 3.7–4.8 μm was applied to the actual experimental observation of the turbofan civil aviation aircraft. The ground observation distance was 15 km, and the flying height was 3 km. When implementing temperature inversion with the method presented in this paper, the surface temperature of the aircraft engine hot parts was 381 K, the correction uncertainty was ±10 K, the surface temperature of the skin was 296 K, and the correction uncertainty was ±6 K. As the experiment showed, the method in this paper can effectively implement infrared target temperature inversion and provide a reference for the quantification of infrared data.
Highlights
IntroductionThe infrared radiation characteristics of highly maneuverable targets and their information interpretation are an important basis for target detection, recognition, and tracking [1]
Academic Editor: Feng GaoThe infrared radiation characteristics of highly maneuverable targets and their information interpretation are an important basis for target detection, recognition, and tracking [1].The technical tackling of stealth materials on the surface of aircraft and the precise strike of suspicious targets in the air are in a great need of the real radiation characteristics of aircraft targets [2,3]
While aerial targets are imaged on the middle-wave infrared camera through the atmosphere, the background radiation of non-targets is imaged on the infrared camera
Summary
The infrared radiation characteristics of highly maneuverable targets and their information interpretation are an important basis for target detection, recognition, and tracking [1]. There are generally few measurements of aircraft radiation characteristics under high-speed navigation, and most experithe real-time calibration correction target infrared radiation measurement ments ignore the problem and of atmospheric correction on the observation path in methods actual are proposed [13,14]. On the basis of theoretical analysis, a radiation the factors that may induce temperature errors in the actual measurement process measurement experiment is carried out on a civil aviation aircraft in a flight state, collectare discussed. On the basis of theoretical analysis, a radiation measurement ing the measured radiation characteristic data of the flying target, inverting the target experiment is carried out on a civil aviation aircraft in a flight state, collecting the measured temperature, and calculating the temperature measurement error. Radiation characteristic data of the flying target, inverting the target temperature, and calculating the temperature measurement error
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