A novel method of linear demodulation based on edge filter is presented. An experimental system is built up in which LPG is used as the edge filter. We achieve linear demodulation with a bandwidth of 5nm.
A novel variety of three dimensional （3D） vibration sensor based on chirped fiber Bragg grating （CFBG） is developed to measure 3D vibration in the mechanical equipment field. The sensor is composed of three indepe...A novel variety of three dimensional （3D） vibration sensor based on chirped fiber Bragg grating （CFBG） is developed to measure 3D vibration in the mechanical equipment field. The sensor is composed of three independent vibration sensing units. Each unit uses double matched chirped gratings as sensing elements, and the sensing signal is processed by the edge filtering demodulation method. The structure and principle of the sensor are theoretically analyzed, and its performances are obtained from some experiments and the results are as follows： operating frequency range of the sensor is 10Hz - 500Hz; acceleration measurement range is 2m.s-2 - 30m.s-2; sensitivity is about 70 mV/m.s-2; crosstalk coefficient is greater than 22 dB; self-compensation for temperature is available. Eventually the sensor is applied to monitor the vibration state of radiation pump. Seen from its experiments and applications, the sensor has good sensing performances, which can meet a certain requirement for some engineering measurement.展开更多
基金Supported by the National '863' high technology project (2002 AA313110)
文摘A novel method of linear demodulation based on edge filter is presented. An experimental system is built up in which LPG is used as the edge filter. We achieve linear demodulation with a bandwidth of 5nm.
基金This research was funded by the Key Project of National Science Foundation of China, Award Number： 61290311.
文摘A novel variety of three dimensional （3D） vibration sensor based on chirped fiber Bragg grating （CFBG） is developed to measure 3D vibration in the mechanical equipment field. The sensor is composed of three independent vibration sensing units. Each unit uses double matched chirped gratings as sensing elements, and the sensing signal is processed by the edge filtering demodulation method. The structure and principle of the sensor are theoretically analyzed, and its performances are obtained from some experiments and the results are as follows： operating frequency range of the sensor is 10Hz - 500Hz; acceleration measurement range is 2m.s-2 - 30m.s-2; sensitivity is about 70 mV/m.s-2; crosstalk coefficient is greater than 22 dB; self-compensation for temperature is available. Eventually the sensor is applied to monitor the vibration state of radiation pump. Seen from its experiments and applications, the sensor has good sensing performances, which can meet a certain requirement for some engineering measurement.
