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Distributed optical fiber sensor, distributed optical fiber temperature sensor, and signal processing method
Distributed optical fiber sensor, distributed optical fiber temperature sensor, and signal processing method
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机译：分布式光纤传感器，分布式光纤温度传感器及信号处理方法
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摘要
PURPOSE:To improve the measuring distance and the temperature resolution of temperature distribution in a low or high temperature region by making the control of AOM used for an optical directional coupler and the sensitivity setting, synchronized with the control, of a detector, and effectively assigning a dynamic range of a device to a to-be-measured object. CONSTITUTION:A device is composed of a semiconductor laser generation part 1, acoustooptic modulator (hereinafter abbreviated to AOM) 2, to-be-measured optical fiber 3, spectroscope 4, detectors 5 and 6 using photoelectric converters, amplifiers 7 and 8, digital signal treatment part 9, computer 10, timing generator 11, and to-be- measured object 12. The timing generator 11 outputs the control signal of the AOM 2 besides a laser pulse trigger signal. The rise of the control signal and a trigger signal have a time difference corresponding to a distance to a boundary point. This guids Raman scattering light after the boundary point to the detectors gain-set conforming to the level. That is, a lower gain is set in a high temperature region and a higher gain is set in the measurement of a low temperature region, and the AOM is controlled so as to avoid the measurement of the boundary point. Thus temperature distribution can be measured over the overall length of an optical fiber.
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