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红外探测器的频率响应是表征探测器响应速度的性能参数。测量探测器的频率响应时,需要将入射的红外辐射强度进行正弦调制,改变调制频率,分别记录在各种调制频率下探测器输出的信号电压,然后进行归一化处理,就得到探测器的相对频率响应特性。在实际测量中,通常用机械调制的方法,借助正弦调制盘将恒定的红外辐射调制成辐射强度随时间按正弦规律变化的辐射。但采用机械调制盘不易得到标准的正弦调制,对机械调制盘的转速稳定性需要进行特
The frequency response of an infrared detector is a performance parameter that characterizes the detector’s response speed. When measuring the frequency response of the detector, it is necessary to sinusoidally modulate the intensity of the incident infrared radiation, change the modulation frequency, record the signal voltages output by the detectors at various modulation frequencies, and then normalize to obtain the detector’s Relative frequency response characteristics. In the actual measurement, it is common to mechanically modulate the constant infrared radiation by means of a sinusoidal modulation disk into radiation whose radiation intensity varies sinusoidally with time. However, the use of mechanical modulation disk is not easy to get the standard sine modulation of the mechanical modulation disk speed stability needs special