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A Method of Wavelength Cycling Tuning to Compensate the Working Point Drift of Interferometric Sensor

A technology of tuning compensation and working point, which is applied in the field of static working point stability of double-beam interference type sensor, can solve the problems of double-beam interference type optical fiber sensor working point drift, etc., and achieve high sensitivity and signal-to-noise ratio, narrow line width and high power Effect

Inactive Publication Date: 2017-05-03
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] In order to solve the problem of the drift of the working point of the double-beam interference optical fiber sensor, the present invention proposes a method for compensating the drift of the working point by tuning the working wavelength of the DFB laser based on current circulation

Method used

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  • A Method of Wavelength Cycling Tuning to Compensate the Working Point Drift of Interferometric Sensor
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  • A Method of Wavelength Cycling Tuning to Compensate the Working Point Drift of Interferometric Sensor

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Embodiment Construction

[0029] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solution and the drawings.

[0030] A system for wavelength cyclic tuning to compensate for the drift of the working point of an interferometric sensor, which mainly includes a tunable laser 1, a circulator 2, a double-beam interference fiber sensor 3, a detector module 4, a signal acquisition and control circuit 5, and a tunable laser driver Circuit 6, computer system 7.

[0031] The computer system 7 issues instructions to the signal acquisition and control circuit 5; the signal acquisition and control circuit 5 controls the tunable laser drive circuit 6 and the detector module 3, and collects signals from the detector module 3, and transmits the collected signals to the computer system For further analysis and processing.

[0032] The tunable laser 1 is a distributed feedback semiconductor laser with a center wavelength of 1550 nm, and its wavelength tuning...

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Abstract

The invention provides a wavelength circulation tuning compensation interferential sensor operating point drift method and belongs to the field of optical fiber sensing technology. The method is characterized in that stabilization of quiescent operating points of a two-beam interferential sensor is achieved by means of a bandwidth-limited wavelength tunable laser. According to the method, the circulating tunable wavelength of the laser is controlled through a sensor feedback signal, the quiescent operating points of the sensor are tracked and compensated in real time, and long-term stable operation of the sensor is achieved. The method has the advantages that the distributed feedback semiconductor laser is adopted as a light source, a circulation tuning compensation method is used for solving the problem of operating point drift of the interferential sensor, the compensation problem that the operating points drift on a large range when the sensor is under a severe environment is solved, and system cost is reduced compared with other methods. The method is suitable for detecting vibration and acoustic waves of complex environments by means of the optical fiber sensing technology.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber sensing, and is a method and system for realizing the stabilization of the static operating point of a dual-beam interference sensor by using a wavelength tunable laser with a limited bandwidth. The method realizes the long-term stable operation of the sensor by real-time tracking and compensating the static operating point of the sensor by cyclic wavelength tuning. The method particularly relates to the working point compensation of a low-fineness F-P sensor based on interference-intensity modulation. The sensor feedback signal is used to control the wavelength of the tunable laser to track the static working point in a wide range, which can realize high-sensitivity measurement of vibration or acoustic signals. The invention is suitable for detecting vibration and sound waves in a complex environment by using optical fiber sensing technology. Background technique [0002] Compared with capaciti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
Inventor 毛雪峰周新磊于清旭
Owner DALIAN UNIV OF TECH
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