高温小目标红外辐射特性测量方法

Measurement Method of Infrared Radiometric Characteristics for High-Temperature Small Targets

目标的温度较高且距成像系统较远时,目标像在探测器靶面上占据多个像元且输出灰度易饱和,传统的点源目标和面源目标处理方法无法适用。针对上述问题,提出一种高温小目标辐射特性测量方法,并通过外场实验验证了该方法的有效性。首先,建立测量系统的高温定标模型,并修正平行光管透过率对定标模型的影响。然后,根据目标能量虽弥散到多个像元但到达探测器靶面的总能量不变的现象,提出一种针对高温小目标的辐射特性测量方法。最后,采用Φ600mm红外辐射特性测量系统进行外场高温小目标辐射测量实验。结果表明,考虑大气透过率和大气程辐射后,可以实现对远距离高温小目标较高精度的测量,验证了方法的有效性。

When the target is at high temperature and far from the imaging system,its image on the detector array occupies dozens of pixels and the output grayscale is easy to saturate.As a result,typical process methods for pointsource target and extended-source target are not applicable any more.To overcome these problems,a measurement method is proposed measure high-temperature infrared small targets,and the effectiveness of the proposed method has been validated by experiments in the outfield.First of all,the radiometric calibration formula of measurement system in high temperature range is built,and the influence of the collimator transmittance on the calibration model is corrected.Then,according to the fact that the target energy diffuses dozens of pixels but the total energy that reaches the detector array remains unchanged,a measurement method is proposed to measure the characteristics of hightemperature infrared small targets.Finally,a Φ600 mm infrared radiation characteristic measurement system is employed to measure the radiation of high-temperature infrared small target in the outfield.Experimental results indicate that,in consideration of the atmospheric transmittance and path radiance,the proposed method can achieve high-accuracy measurement for remote high-temperature infrared small targets,and the effectiveness of the proposed method has been verified.