【摘要】 设计了一种基于512×8元双波段TDI红外焦平面探测器的低噪声实时成像数据采集系统。根据器件内部的电路结构以及输出模拟信号的特点,设计了一种由偏置电压、驱动电路、模数转换电路和数字信号处理模块等组成的低噪声采集电路。经噪声测试可知,在26℃的室温下,电路噪声为0.02~0.18 mV;当积分时间为300μs时,短波红外和中波红外探测器各个像元的噪声电压分别为2.5~4.5 mV和8~10 mV,其各个像元的信噪比分别为52~57 dB和43~48 dB。结果表明,该系统具有良好的噪声特性,可以满足实际的工程应用需求。更多还原

【Abstract】 A low noise real-time imaging data acquisition system based on a 512x8 dual band TDI IRFPA is designed.According to the characteristics of internal circuits and output analog signals,a low noise collection circuit composed of bias voltage,drive circuit,A/D conversion circuit and digital signal processing module etc is designed.It is found in the noise test that at the room temperature of 26 ℃,the noise of the circuit is 0.02 mV to 0.18 mV.For the integration time of 300 μs,the noise voltage of each shortwave infrared detector element and that of each mid-wave infrared detector element are 2.5mV to 4.5 mV and 8 mV to 10 mV respectively.Their signal-to noise ratios are 52 dB to 57 dB and 43 dB to 48 dB respectively.The test results show that the system has good noise characteristics and can meet the requirements of practical engineering application.更多还原