飞机红外光谱辐射特性的多光谱测量

Multispectral Measurements of Infrared Spectral Characteristics of an Aircraft

飞机机体及其羽流的红外光谱辐射特性,可以为探测、跟踪系统的谱段选择提供依据。准确的光谱辐射特性有利于提高系统探测和跟踪的能力。对飞机的红外辐射光谱特性进行了外场测量研究。建立和分析了辐射传输模型,设计了一个多谱段、滤光片分光的中波红外多光谱成像仪,采用了640pixel×512pixel的中波面阵探测器,响应波长范围覆盖3.7-4.8μm,并对其噪声性能进行了评估。实际选取了民航飞机进行实验测量,获取了机体及羽流在4个谱段上的光谱辐射特性。与传统的方法相比,获得了更真实的飞机红外辐射光谱特性。

The spectral characteristics of infrared radiation from aircraft body and its plume provide a basis for band selection to detect and track the aircraft. Accurate spectral characteristics improve the performances of detection and tracking. Field multispectral measurements of the characteristics are introduced. A radiation transfer model which helps to measure the aircraft plume is proposed and analyzed. Furthermore, a multispectral imager with spectroscopic filters is designed. It uses a mid-infrared detector, of which the dimension is 640 pixel × 512 pixel, and the spectral response covers 3.7-4.8 fire. The noise performance of the imager is also evaluated. A civil aeroplane is selected for the measurements. Under the transfer model, the radiances of the aircraft, both the body and the plume, are obtained in 4 spectral bands. Compared to the conventional method, more accurate infrared spectral characteristics of aircraft are acquired.