The Research Of The Signal Detection Of DC Optical Current Transducer

The Optical Direct Current Transducer based on Faraday Magneto-optic effects have a great future,but still some problems exist in the application.In this paper,firstly it designs the structure of the Optical Direct Current Transducer and analyzes and tests the interior noise which is led into from the measurement and the signal to noise characteristic.And also it verifies the noise overlaps the signal band.Then,it analyzes and compares the methods of measurement of weak signal,to contend with the precision of current measurement in the DC transition system,it uses the method of modulate and demodulate to measure DC current on the DC line and uses the correlation detection to harmonic waves on DC line.Thirdly it designs the DC current measurement system of The Optical Direct Current Transducers, simulates and verifies by the LabVIEW software,also designs a structure of signal measurement and a test circuit of DC measurement.The results of simulation and test indicate the DC measurement system contends with measurement standard.Lastly,it designs the characteristic harmonic wave measurement system by the same principle.Also simulates and verifies on the LabVIEW software,the result contends the precision standard of harmonic waves.