基于串口的光纤光栅解调仪多通道扩展电路设计

Channel Multiplex Circuit Design for Optical Sensor Interrogator Based on Serial Interface

光纤光栅解调仪(si720)只有2个通道,为使其可连接更多的光纤传感器,以满足需大量监测点的大型传感工程的要求,需扩展其通道数.介绍采用光开关来实现扩展通道数的方法,并设计了1种基于AT89C2051单片机制作的光开关驱动电路.在串口通信下,可实现4个通道间相互切换,切换时间小于20ms.并分析了电路硬件和软件设计,具有一定的实用价值.

Currently only two sensor channels are used in si720 optical sensor demodulator. In order to connect it to more fiber-optic sensors such that the technical requirements can be met for large-scale sensor engineering projects involving numerous monitors, increasing the number of channels becomes necessary. This paper introduces a method of adding additional channels to the demodulator using optical switches, and a corresponding drive-circuit design is presented based on the AT89C2051 monolithic integrated circuit. In serial port communication, it can switch to each other among 4 channels, and switching takes no more than 20 ms. Implementation of both hardware and software design is also investigated. It is expected that this work may render certain practical references for engineering applications.