CAJ | 학술논문

航空喷气发动机的红外辐射特性是对发动机进行隐身设计与反隐身探测的重要依据。首先，针对发动机高温部件及燃气温度范围宽、梯度大而超出红外热像仪响应范围的问题，提出了多积分时间组合测试方法，实现了不失真测试；其次，通过多帧时间平均方法分析了各积分时间对应的测温范围，并采用逐像素辐亮度值替代方法，获得了代表发动机全部辐射信息的合成图像；最后，根据合成图像计算了发动机红外辐射强度，并与相同测点的红外光谱辐射仪测试结果进行对比，最大误差不超过10%。结果表明：基于红外热像仪的多积分时间组合测试方法及其数据处理方法是合理有效的。
항공분기발동궤적홍외복사특성시대발동궤진행은신설계여반은신탐측적중요의거。수선，침대발동궤고온부건급연기온도범위관、제도대이초출홍외열상의향응범위적문제，제출료다적분시간조합측시방법，실현료불실진측시；기차，통과다정시간평균방법분석료각적분시간대응적측온범위，병채용축상소복량도치체대방법，획득료대표발동궤전부복사신식적합성도상；최후，근거합성도상계산료발동궤홍외복사강도，병여상동측점적홍외광보복사의측시결과진행대비，최대오차불초과10%。결과표명：기우홍외열상의적다적분시간조합측시방법급기수거처리방법시합리유효적。
The infrared(IR) signature is the important basis for IR stealth design and anti-stealth detection of jet aero-engine. There were three major contributions in this paper. Firstly, the jet aero-engine had a wide temperature span to be measured, which was far too large for an IR camera to cover in one snapshot. This was accomplished by using multi-integral time combined measure method, each integral time was optimized to a definite range of temperature and to make sure that the combination of all integral times seamlessly covered the entire temperature range of target. Secondly, the measured temperature range of each integral time was defined by multi-frame image time-averaging method, then a per-pixel radiance replacement and images synthesization method was proposed to form an integrated IR image. Compared with IR image of single integral time, the integrated image shows abundant target details and signature information. Finally, the distribution of IR radiant intensity was calculated, compared with IR spectroradiometer measurement at the same test-point, and error was less than 10%. The result shows that proposed methods based on IR camera are all reasonable and efficient.