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.

Inactive Publication Date: 2018-12-07
JILIN UNIV
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Problems solved by technology

However, using only one pulse coding technology can only improve the signal-to-noise ratio of the syst

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

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Embodiment 1

[0061] The TSL-510 tunable laser from Santec Company is selected as the carrier light source. The wavelength range of the laser is 1510nm-1630nm, and the set wavelength is 1550nm; both modulator 1 and modulator 2 are MXAN-LN-40 from Photline Company, and the bandwidth is 32GHz ; The DC bias voltage is 9V; the amplifier is an erbium-doped fiber amplifier from ZTE Corporation, the wavelength range is 1530-1565nm, and the amplification factor is greater than 35 times; the microwave signal source is 8257D from Agilent; the pulse pattern signal generator from Agilent , the model is 81134A, the frequency range is 15MHz~3.35GHz; the photoelectric detector is SD-48 of Tektronix, the bandwidth is 35GHz; the sensing fiber is the fiber of YOFC Optical Fiber and Cable Co., Ltd., and the stimulated Brillouin gain linewidth is 40MHz, Brillouin frequency shift, the length is 300 meters; the isolation degree of the optical isolator is greater than 40dB; the data acquisition card is PCI-5114 da...

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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.

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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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35364
Inventor 董玮王衎秋
Owner JILIN UNIV
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