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本文介绍一种高精度光纤静位移传感器用的调理电路.它是传感器与单片机之间的接口电路,如图1所示.电路灵敏度高(4.24mV/nA),分辨力极强(10~(-10)A).它采用积分型I/U转换、双路消噪法、高阶滤波等方法从噪声中提取出微弱信号. 一、前置放大器的设计与调试前置放大器是该测量系统的关键环节之一.它的精度、稳定度、灵敏度直接决定整个系统的性能指标.它应具备能够接收进微弱信号的能力,能从光源和光电探测器及地线等造成的噪声中放大有用信号.其框图如图2所示.图中信号臂电流I_(01)是指从输出光纤输出的随静位移变化的光电流;参考臂电流I_(02)是指光源输出的光电流,是一个恒定值.
This article describes a high-precision optical fiber static displacement sensor conditioning circuit.It is the interface between the sensor and the microcontroller circuit shown in Figure 1. High sensitivity circuit (4.24mV / nA), strong resolution (10 ~ ( -10) A) .It uses the integral type I / U conversion, two-way noise reduction method, high-order filter and other methods to extract weak signals from the noise.A preamplifier design and debugging preamplifier is the measurement system One of the key aspects of its accuracy, stability, sensitivity directly determines the performance of the entire system.It should have the ability to receive into the weak signal, from light sources and photodetectors and ground noise amplification caused by useful Signal.The block diagram shown in Figure 2. The signal arm current I_ (01) refers to the optical fiber output from the output fiber changes with the static displacement; reference arm current I_ (02) refers to the light source output photocurrent is A constant value.