Simple data acquisition system of distributed temperature sensor

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.