BOCDR slope settlement monitoring system and method based on super-continuum spectrum light source
A supercontinuum light source and settlement monitoring technology, applied in the field of geological slope settlement monitoring system, can solve the problem of low spatial resolution of the system, and achieve the effects of improving economy and improving measurement accuracy
Active Publication Date: 2019-10-22
TAIYUAN UNIV OF TECH
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Problems solved by technology
[0009] Although the Brillouin distributed optical fiber sensing technology mentioned above realizes distributed slope monitoring, they use the Brillouin optical time domain reflection technology, which uses pulsed light as the detection signal, and the spatial resolution of the system is not high, usually Meter-level spatial resolution with monitoring blind spots between measurement events
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[0030]The sensing device of the BOCDR slope settlement monitoring system based on the supercontinuum light source, including the supercontinuum light source 1, the tunable optical filter 2, the first fiber coupler 3, the first optical amplifier 4, and the optical polarizer 5 , optical circulator 6, sensing fiber 7, second optical amplifier 8, variable optical delay line 9, third optical amplifier 10, second optical fiber coupler 11, double-balanced photodetector 12, data acquisition card 13, computer 14.
[0031] Wherein, the outgoing end of the supercontinuum light source 1 is connected with the incoming end of the tunable optical filter 2; the outgoing end of the tunable optical filter 2 is connected with the incoming end of the first fiber coupler 3 through a single-mode fiber jumper;
[0032] The first outgoing end of the first optical fiber coupler 3 is connected to the incoming end of the first optical amplifier 4 through a single-mode optical fiber jumper; The incident...
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The invention relates to a geological slope settlement monitoring system, in particular to a BOCDR slope settlement monitoring system and a BOCDR slope settlement monitoring method based on a super-continuum spectrum light source. The BOCDR slope settlement monitoring system and the BOCDR slope settlement monitoring method solve the problem of monitoring inconsistency of an existing geological slope settlement monitoring system, and effectively prevent misjudgment of information caused by electromagnetic interference on the traditional monitoring system. The BOCDR slope settlement monitoring method comprises the steps that: a laser signal transmitted from the super-continuum spectrum light source is divided into two paths of probe light and reference light; the probe light passes through an optical scrambler after being amplified and is then injected into a sensing optical fiber by means of an optical circulator unidirectionally, and a Brillouin backscattered light signal is generatedin the optical fiber; the Brillouin backscattered light signal is amplified and then incident into a second optical fiber coupler; and the reference light is amplified and then interferes with the Brillouin backscattered light in the optical fiber coupler. The BOCDR slope settlement monitoring system and the BOCDR slope settlement monitoring method based on the super-continuum spectrum light source utilize the photoelectric detector to obtain an interference beat frequency signal, can obtain a Brillouin gain spectra varying with strain at positions of different optical fiber lengths after theinterference beat frequency signal is processed by means of a data acquisition card and a computer, and further obtain geological slope settlement information.
Description
technical field [0001] The invention is applied to a geological slope settlement monitoring system, specifically a supercontinuum light source-based BOCDR slope settlement monitoring system and method, which can realize distributed real-time remote monitoring of slope settlement strain. Background technique [0002] In recent years, geological disasters have occurred frequently in our country, such as landslides, road landslides, mudslides, etc., which seriously threaten the production and life of human safety and health. The two most important reasons for the above situation are that natural evolution is irresistible and that human beings destroy nature and cause ecological imbalance. On the one hand, we strive to conform to nature so that man and nature can live in harmony; on the other hand, we can use scientific and technological means to prevent disasters in real time. In view of the characteristics of suddenness, wide distribution, and certain concealment of slope geo...
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Login to View More IPC IPC(8): G01C5/00
CPCG01C5/00
Inventor 龙建辉李旭鹏王双娇王贵洲岳扬扬靳玉琪张玲玲
Owner TAIYUAN UNIV OF TECH