Development Of Optical Fiber Sensor Based On DSP

A optical fiber current sensor (OCS) has been developed in this thesis. The sensing head is made of a block of flint glass ZF6, and it has been designed into a particular shape in order to reduce the phasic difference generated by refraction in the sensing head. This OCS uses a TMS320VC5402 digital signal processor (DSP) to process digital signal, it makes the OCS can get a real-time measure result. A singlechip was used to control the DSP and a liquid crystal display screen;the screen can display the current's instantaneous value, effective value and spectral parameters.At the beginning of the thesis, the opticator of OCS was designed. And the phase-compensation mathematic model of geometric approach has been deduced. The mathematic model of temperature compensation of the two-luminous-beam measuring method was also deduced.Secondly, the amplification-filter circuit, the signal processing circuit and the illuminant drive which can compensate the fluctuation of temperature are designed. And the system drivers have programmed.Finally, the experimental system has been designed and set up. The performance parameters of OCS have been calculated from the test data. The performance parameters meet the requirements of design. Temperature characteristic of OCS has been tested, and the temperature compensation function is founded. And the measure results of OCS have been corrected by software, so the OCS had good stableness of temperature.The performance parameters of the OCS:Range ability: O-1O0OA;Accuracy: 0.3%;Non-linearity: <0.3%;Response time: <2us;Sensitivity: 0.9992...