分布式温度传感器的简单数据采集系统

Simple data acquisition system of distributed temperature sensor

这里开发实现了一种较简单的分布式温度传感器的采集系统。通常情况下,运行在高频的数/模转换器很昂贵,因此提出一种采用低速数/模转换器的方法来降低成本,同时在低速数/模转换器之前加入采样保持电路,获得较小的采样分辨率、提高温度稳定性。该系统通过延迟采样保持电路和数/模转换相对于激光触发器的保持时间,可以测量沿光纤任何位置处的温度,其可以在短距离的光纤监测系统中得到广泛应用。

The purpose in this article is to develop and realize a simple data acquisition system of the distributed temperature sensor. Normally the D/A converter operating in high frequency is expensive,so the method adopting low-speed D/A converter is proposed to reduce the cost. The sampling hold circuit is added before the low-speed D/A converter to obtain smaller sampling resolution and improve temperature stability. The temperature at any position along the optical fiber can be measured by delaying the hold time of sampling hold circuit and D/A conversion relative to the laser trigger. The system can be widely used in the optical fiber monitoring system in short distance.