Pulse-encoded distributed optical fiber raman temperature sensing method and device

A distributed optical fiber and pulse coding technology, applied in the direction of using optical devices, thermometers with physical/chemical changes, thermometers, etc., can solve problems such as incompatibility

Pending Publication Date: 2019-02-12
四川中稹能源有限公司
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Problems solved by technology

It can be seen that it is impossible to obtain a large dynamic range ...

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  • Pulse-encoded distributed optical fiber raman temperature sensing method and device
  • Pulse-encoded distributed optical fiber raman temperature sensing method and device
  • Pulse-encoded distributed optical fiber raman temperature sensing method and device

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Embodiment Construction

[0055] The technical solutions of the various embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0056] refer to figure 1 , a pulse coded distributed optical fiber Raman temperature sensing method and device adopted in the present invention, the device includes a semiconductor laser and a drive module 19, an FPGA coded modulator 12 containing SOA, an optical fiber amplifier 13, an optical fiber circulator 14, Thermostat 15, optical fiber wavelength division multiplexer 16, sensing optical fiber 10, APD detector module 17, A / D module 18 and industrial computer 11. The industria...

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Abstract

The invention discloses a pulse-encoded distributed optical fiber raman temperature sensing method and device. An any-order encoding matrix is provided, all of principal diagonal elements are 0 and all of the remaining elements are 1; each row of the matrix is sequentially injected into the distributed optical fiber raman temperature sensing device; the device comprises a semiconductor laser, a driving module, an FPGA (Field Programmable Gate Array) code modulator including an SOA (Semiconductor Optical Amplifier), an optical fiber amplifier, an optical fiber circulator, an optical fiber wavelength division multiplexer, a thermotank, a sensing optical fiber, a detector module, an A/D (Analog to Digital) module and an industrial computer. In combination with a pulse encoding principle and an optical fiber rayleigh scattering assisted demodulation raman scattering principle, the dynamic range of a sensing system is improved without changing a spatial resolution, the measurement length and measurement precision are enhanced; and the pulse-encoded distributed optical fiber raman temperature sensing method and device are suitable for measurement and disaster warning of water, oil and gas pipelines, a tunnel and a large-scale civil project in a large range.

Description

technical field [0001] The invention relates to a distributed optical fiber Raman temperature sensing device, in particular to a distributed optical fiber Raman temperature sensing method and device using pulse coding, belonging to the technical field of optical fiber sensing. Background technique [0002] ROTDR (Raman Optical Time Domain Reflectometer) is a distributed optical fiber temperature sensing system made of Raman backscattering. The optical pulse is injected into the optical fiber as a detection signal. When the optical pulse propagates along the optical fiber, the backscattering part of the Raman scattering everywhere will continue to return to the incident end of the optical fiber. Raman scattering includes Stokes and anti-Stokes light, where anti-Stokes light is sensitive to fiber temperature. By detecting the size and arrival time of the backscattered light at the input end through a suitable optical coupler and a high-speed response photodetector, the temper...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01B11/02G01K11/324
CPCG01B11/02G01K11/32G01K11/324
Inventor 张舒曼邱福平龙伟
Owner 四川中稹能源有限公司
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