Sensor for detecting the temperature and vibration position of fully distributed optical fiber

Abstract

The invention discloses a sensor for detecting the temperature and vibration position of a fully distributed optical fiber. The sensor adopts a laser, a pulse generator, an acousto-optic modulator, an isolator, an erbium-doped fiber amplifier, a circulator and a Raman wavelength division multiplexer to send two pulse signals with different sizes to the fully distributed optical fiber; the returned signals receive the treatment of the Raman wavelength division multiplexer, an avalanche diode and a data collector, and a computer processes collection data in the time of one of the pulse signals to obtain the temperature; the returned signals receive the treatment of the Raman wavelength division multiplexer, the circulator, a Rayleigh scattered-light processing unit and the data collector, and the computer processes collection data in the time of the other of the pulse signals to obtain the vibration position. The sensor for detecting the temperature and vibration position of the fully distributed optical fiber can monitor the temperature and vibration position on the same optical fiber at the same time, the whole cost is much smaller than that of the superposition of two individual systems, the measurement precision is high, and the measurement is convenient and quick.

Description

technical field [0001] The invention relates to the field of sensors, in particular to the sensor aspect of a fully distributed optical fiber, and more specifically, to a sensor for detecting the temperature and vibration position of a fully distributed optical fiber. Background technique [0002] When light propagates in the optical fiber, if the external environment changes, some parameters of the light in the optical fiber will change accordingly, such as the speed of light, phase, and even the polarization state of the light will also change. The corresponding physical quantities can be obtained by measuring these optical parameters in the transmission fiber. We call this technology of using optical fiber as a sensor as optical fiber sensing technology. [0003] Fully distributed optical fiber sensing technology uses optical fiber as the sensing element. The optical fiber itself is the medium for transmitting information and has the function of sensing at the same time. ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that, aiming at the above-mentioned existing optical fiber-based sensors that use two sets of independent systems to measure the vibration position and temperature respectively, the technical defects of high cost are provided to detect the full distribution Optical fiber temperature and vibration position sensor

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