【摘要】 针对锰钴镍氧化物薄膜型红外探测器的结构特点,提出了一种红外探测器低频噪声长时间监测系统设计方案,并进行了测试验证。监测系统采用低噪声偏置电源激发红外探测器的低频噪声,然后将该低频噪声信号通过设计的高性能前置放大器放大,利用基于PC的硬件平台采集放大后的噪声信号,最后通过编写的算法提取噪声信号的各种参量。实际测试结果表明,该监测系统能在10 k Hz的采样率下连续30 d不间断采集探测器的低频噪声,并实时计算噪声信号的峰峰值、均方值、功率谱密度等参数,频率分辨率可达到0.05 Hz。更多还原

【Abstract】 For the structural characteristics of infrared detector based on thin film thermistor of ternary Mn-Ni-Co oxide,a measurement system for long-term monitoring of low-frequency noise is designed and tested. The low-frequency noise of infrared detector was stimulated with a low noise bias voltage source,and then the stimulated random noise signal was fed through a designed high-performance preamplifier. After that,the amplified noise signal was acquired by a PC-based acquisition platform,and then various parameters of the noise signal were extracted with wrote algorithms on the PC platform. The test results show that the measurement system can consecutively acquire the low-frequency noise of infrared detectors at 10 k Hz sampling rate for 30 days,calculate the peak to peak value,mean square value,power spectral density and other parameters in real time,and the frequency resolution achieved is up to 0. 05 Hz.更多还原