Study On The Underground Cable Surface Temperature Monitor System

The temperature is one thing of important state parameter in physics chemistry and biology process.Accordingly,it is an important thing to temperature measure in the application of the engineering and science research.In recent years,the sensor measurement technique of distributed optical fiber is one of the pop questions in the sensor measurement field which this underground cable surface temperature measurement system belongs to.Due to the limitation of traditional sensor to supervise a spot,under some particular environment situation to supervise the large quantity position of the underground cable at the same time,it can not supervise and measure the underground cable surface temperature effectively.Otherwise,sensor measurement technique of distributed optical fiber can achieve it with ease.The thesis researches Raman Distributed Optical Fiber Temperature Sensor systems through analyzing its measuring principle.It has been completed that the structure design of the underground cable surface temperature measure system is constituted by the distributed optical fiber sensor.Especially,the sensitiveness of the system measure temperature is considered on the design of the data acquisition card.We make a comparison between double channel temperature signal demodulation method and single channel temperature signal demodulation method at the same time.And depending on it, we put forward a double channel temperature signal demodulation method;It doesn't only advances the signal Noise Ratio(SNR) of the system,but also makes the sensitiveness of the system measure temperature an enormous enhancement.Otherwise,we put forward some decisive techniques which are noticed in the high-speed data acquisition system,and carries out the design of the logic controller in the system with the programmable logic device.Adopting a single chip micyoco to carry on reading the acquisition data,the acquisition data is sent to the computer through the single-chip's serial interface.We design the cable's temperature display window which shows the cable's temperature state in real time with Visual C++ design flat on the computer.