Investigation Of The Key Technologies Of Interferometric Fiber Optic Sensor

Interferometric optical fiber transducer is a newly developed discipline that relates to optics, optoelectronics, mechanics, processing and signal processing. Which pressure sensitivity is skyscraping, dynamic range is prodigious, and range of response is a larger broadband. Therefore, many countries focus on the subject, and it becomes one of the most interested subjects .In this degree paper, I have researched the upper limit and lower limit(background noise) of dynamic range, phase sensitivity and the pressure sensitivity of the optical fiber transducer, in addition I have discussed the meaning, difference and relation about phase sensitivity and pressure sensitivity. The more important, the degree paper analyses the factors that affect the phase of the output signal, the design about the frequency of resonance of the probe of the transducer and the design on the filter of the demodulator circuit.We have designed and debugged the demodulator circuit in this subject. And the paper puts forward some suggestion to improve the pick-up probe's structure and the design of the filter in the AGC circuit.