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在介绍了640×512 InGaAs探测器工作原理的基础上,详细分析了InGaAs探测器驱动电路的组成原理、设计方法,重点是偏置电压电路、脉冲电压与控制信号驱动电路、探测器工作温度检测及控制电路的设计等关键技术。采用模拟PI温控电路保证了探测器内部制冷器在温控过程中对探测器无干扰,并能使探测器稳定地工作在合适的温度点,这样有利于提高仪器的信噪比。试验结果表明:该驱动电路满足系统要求,能用于工作温度比较宽的场合,并具有体积小、实用性好、可靠性高等特点。
After introducing the working principle of the 640 × 512 InGaAs detector, the principle and design method of the InGaAs detector driving circuit are analyzed in detail. The emphasis is on the bias voltage circuit, the pulse voltage and the control signal driving circuit, the detection of the working temperature of the detector And control circuit design and other key technologies. The use of analog PI temperature control circuit to ensure that the detector internal cooler in the process of temperature control on the detector without interference, and can make the detector stable at a suitable temperature point, which will help improve the signal to noise ratio of the instrument. The test results show that the driving circuit meets the system requirements and can be used in the occasions where the operating temperature is relatively wide, and has the advantages of small size, good practicability and high reliability.