红外光导探测器组件的串音研究

作为目标探测与成像系统的核心器件,红外探测器组件的空间分辨能力会直接影响探测系统的成像质量。通常使用调制传递函数(Modulation Transfer Function,MTF)对该能力进行评估。而探测器组件的电学串音和光学串音则是影响其MTF的主要因素。利用锁相系统测试了红外探测器组件的电学串音,同时用一套弥散斑直径为30μm的红外小光点测试系统测试了红外探测器组件的线扩展函数(Line Spread Function,LSF)以评价其光学串音。测试结果表明,11.5~12.5μm波段探测器的光学串音明显比8.0~9.0μm波段探测器的大。最后对测试结果进行了分析,为红外探测器组件的光学串音设计提供了参考。

Study of Crosstalk of Infrared Photoconductive Detector Assemblies

As a core device of a target detection and imaging system, an infrared detector assembly＇s space resolution may directly affect the imaging quality of the detection system. Usually, the Modulation Transfer Function （MTF） is used to evaluate the spatial resolution. However, both electric crosstalk and optical crosstalk of a detector assembly are the main factors affecting the MTF. A phase-locked system is used to measure the electric crosstalk of the infrared detector assembly while an infrared micron-spot test system is used to measure the Line Spread Function （LSF） of the assembly so as to evaluate its optical crosstalk. The measurement result shows that the optical crosstalk of the 11.5-12.5μm waveband detector is obviously greater than that of the 8.0-9.0μm waveband detector. Finally, the measurement result is analyzed. The analysis result provides a reference for the optical crosstalk design of the infrared detector assembly.