Method for improving signal to noise ratio of BOTDA system based on combined pulse code

A technology that combines pulse and signal-to-noise ratio, applied in the direction of converting sensor output, measuring device, instrument, etc., can solve the problem of limited improvement of signal-to-noise ratio and inability to meet the requirements of high signal-to-noise ratio of the system.
CN108955733AInactive Publication Date: 2018-12-07JILIN UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
JILIN UNIV
Publication Date
2018-12-07
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a method for improving the signal to noise ratio of a BOTDA system based on a CCPONS and Walsh combined pulse code, and belongs to the field of distributed fiber sensing. A laser, a coupler, a first electro-optic modulator, a microwave signal source, a DC power supply, a first erbium doped fiber amplifier, an isolator, a second electro-optic modulator, a second first erbiumdoped fiber amplifier, a pulse signal generator, a circulator, a sensing fiber, a photoelectric detector, a data collection card and a computer. CCPONS coding is combined with Walsh coding, the signal to noise ratio of the system is improved greatly under the limited coding length, and thus, the measuring precision is improved.
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Description

technical field

[0001] The invention belongs to the field of distributed optical fiber sensing, and in particular relates to a method for improving the signal-to-noise ratio of a BOTDA system by combining CCPONS and Walsh combined pulse coding. Background technique

[0002] The strain measurement system based on Brillouin Optical Time Domain Analysis (BOTDA) technology has been widely used in the temperature and strain monitoring fields of oil pipelines and power cables due to its advantages of strong receiving signal, high measurement accuracy and large dynamic range. In the BOTDA system, the pulsed pump light is injected from one end of the fiber, and the continuous probe light is injected from the other end of the fiber. The two beams of oppositely transmitted optical signals undergo stimulated Brillouin (SBS) action through the acoustic wave in the fiber. When a When a beam of light falls within the Brillouin scattering spectrum of another beam of light, energy transfer ...

Claims

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