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根据320×256中波红外焦平面器件内部电路结构特点以及输出微弱模拟信号的特点,系统从低噪声和抗干扰的角度出发,设计了由电源模块、驱动电路、A/D转换电路、数据处理电路、时序控制模块等模块组成的低噪声中波红外焦平面图像数据采集系统。通过噪声测试和成像实验得到,在26℃的室温下,测得的电路噪声为0.1 m V,在1000?s积分时间时系统噪声1.5 m V,各个像元的SNR在62~65 d B之间。
According to the characteristics of the internal circuit of 320 × 256 medium wave infrared focal plane device and the characteristics of the output weak analog signal, the system designed by the power supply module, drive circuit, A / D conversion circuit, data processing from low noise and anti-interference point of view Circuit, timing control module and other modules composed of low-noise infrared focal plane image data acquisition system. Through the noise test and imaging experiment, the measured circuit noise is 0.1 mV at room temperature of 26 ° C, the system noise is 1.5 mV at 1000 μs integration time, and the SNR of each pixel is between 62 and 65 dB between.