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High-frequency-response distributed optical fiber vibration sensing device and implementation method

A distributed optical fiber and vibration sensing technology, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problem of unable to collect signal pattern recognition and processing

Inactive Publication Date: 2018-04-10
WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will be limited in intrusion identification monitoring, and it is impossible to collect all signals for pattern recognition processing

Method used

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  • High-frequency-response distributed optical fiber vibration sensing device and implementation method
  • High-frequency-response distributed optical fiber vibration sensing device and implementation method
  • High-frequency-response distributed optical fiber vibration sensing device and implementation method

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0038] First, the light source module (1) emits continuous laser light, which is divided into N+1 beams of light by the light splitting module (2), wherein N beams are processed as detection laser beams, and 1 beam is used as reference light for detection and reception;

[0039] Second, the N-beam detection lasers of the optical splitting module (2) respectively pass through N frequency-shifting modules (3) of different frequency shifts, and the frequency-shifting module (3) includes N frequency-shifting control modules (14)(15)(16 ) controls and modulates the optical modulator (17) (18) (19) respectively, each synchronous acquisition module (12) sends modulation pulses to the frequency shift control module according to the time delay τ, and the frequency shift control module controls the optical modulator...

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Abstract

The invention relates to a high-frequency-response distributed optical fiber vibration sensing device and an implementation method. The high-frequency-response distributed optical fiber vibration sensing device is provided with a light source module, a 1* n +1 light splitting modules, n frequency shifting modules, a 1*n coupling modules, an amplifying module, a polarization control module, a 2*2 couplers, an annular device, a sensing optical fiber, a detection module, a frequency mixing demodulation module, a synchronous acquisition module and a detection analysis module. The frequency division multiplexing technology is applied to a distributed optical fiber vibration sensing device, and the wavelength multiplexing optical pulse signals generate a backward rayleigh scattering signal in asensing optical fiber according to a time sequence. The signals are independent from each other, and crosstalk is prevented. The number of the samples of each detection point of the distributed optical fiber vibration sensing device is increased along with the number of the multiplexed wavelengths, the frequency response of the vibration signals is also increased along with the number of the multiplexed wavelengths, and the detection frequency response of the long-distance distributed optical fiber vibration device is not limited due to the distance.

Description

technical field [0001] The invention is mainly used in the field of safety monitoring, and particularly relates to a high-response distributed optical fiber vibration sensing device and a realization method. technical background [0002] The optical fiber vibration sensor uses optical fiber as the sensing part. Compared with the traditional vibration sensor, it has the advantages of intrinsic passive, anti-electromagnetic interference, long monitoring distance and high sensitivity, and has a wide range of applications. Distributed fiber optic vibration sensors not only have the advantages of fiber optic vibration sensors, but also realize the positioning of vibration events, and are especially suitable for safety monitoring of oil and gas pipelines, national defense borders, railway borders, and national defense optical cables. [0003] The design principles of distributed optical fiber vibration sensors currently include Mach-Zehnder interferometer technology, white light i...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 乔秋晓
Owner WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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