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为实现对微弱光电信号的高灵敏测量,本文采用光电倍增管作为高灵敏光电转换器件,研制了一种微弱光电信号测量装置。进行了相应光路和电路设计,光路部分密封在暗箱中,能有效避免外界杂散光的干扰。设计实现了基于电阻和高精度自稳零运算放大器的放大电路,工作电压范围宽,开环增益高,噪声低,温漂小等优点。该系统具有小型便携、灵敏度高、重复性好等特点,在微弱光信号现场检测方面具有很好的应用前景。
In order to realize highly sensitive measurement of weak optical signals, a photomultiplier tube is used as a highly sensitive photoelectric conversion device, and a weak photoelectric signal measuring device is developed. The corresponding light path and circuit design were carried out. The light path was partially sealed in the dark box, which could effectively avoid the interference of the outside stray light. The design and implementation of an amplifier circuit based on resistance and high precision auto-zero operational amplifier, wide operating voltage range, high open-loop gain, low noise, small temperature drift and so on. The system has the advantages of small size, high sensitivity and good repeatability. It has good application prospect in the field detection of weak optical signals.