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Distributed sensor optical fiber as well as preparation device and method thereof

A sensing optical fiber, distributed technology, applied in cladding optical fiber, using optical devices to transmit sensing components, optical waveguide and light guide, etc. and multiplexing capacity limitations, etc., to achieve the effect that is beneficial to the optical fiber sensing length and multiplexing capacity, good realizability, stability and identity

Active Publication Date: 2012-06-27
武汉光谷光联网科技有限公司
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Problems solved by technology

This method has the following disadvantages: First, each grating has to be prepared separately, and it is difficult to ensure the consistency of writing conditions, so the identity of each grating unit is difficult to achieve
Secondly, the process of connecting a large number of gratings in series is more complicated, and the transmission loss caused by optical fiber fusion is relatively large, so the sensing distance and multiplexing capacity are limited

Method used

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  • Distributed sensor optical fiber as well as preparation device and method thereof
  • Distributed sensor optical fiber as well as preparation device and method thereof
  • Distributed sensor optical fiber as well as preparation device and method thereof

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Embodiment Construction

[0021] The invention provides the structural design, preparation method and device of the distributed sensing optical fiber.

[0022] The invention provides a special structure design of distributed sensing optical fiber. A series of weak Bragg reflection periodic structures with exactly the same physical structure and optical properties are continuously distributed on the optical fiber at a certain distance. The physical essence of this structure is that the refractive index of the fiber core is periodically distributed, and the depth and length of the refractive index modulation can be flexibly designed. The optical characteristics of this structure are that it can reflect a certain wavelength and transmit all other wavelengths, but it is different from the strong reflection of the Bragg grating. Its transmission characteristic is a narrow bandwidth and weak reflection, so we call it " Weak Bragg Reflection Periodic Structure". When the signal light enters the fiber core a...

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Abstract

The invention discloses a distributed sensor fiber as well as a preparation device and method thereof. The distributed sensor optical fiber comprises an outer layer which is an ultraviolet transparent coating layer (1) and an inner layer which is an optical fiber core, wherein a plurality of weak Bragg reflection period structures (2) which have identical physical structures and identical opticalproperties are continuously distributed on the optical fiber core at an interval of a section of delay optical fiber (4). When the optical fiber provided by the invention is used as a distributed sensing detection carrier, the sensing measurement range can be efficiently widened, and the sensing distance and concentration can be increased.

Description

technical field [0001] The invention relates to the field of optical fiber preparation and sensing technology. This weak Bragg reflection periodic structure optical fiber can be used as a detection carrier for distributed sensing, which can not only improve the measurement range of sensing, but also increase the distance and density of distributed sensing. Get a qualitative improvement. Background technique [0002] In recent years, distributed optical fiber sensing (DOFS) has received more and more attention, and has become a research hotspot in the world. In the current distributed optical fiber sensing technology, the quasi-distributed fiber Bragg grating (FBG) multiplexing technology originates from its high sensitivity sensing function for external parameters such as temperature, stress, pressure and vibration, and at the same time has small size, With outstanding advantages such as wide dynamic range and high reliability, it has become the most powerful competitor in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G01D5/26
Inventor 孙琪真刘德明沃江海李晓磊张满亮王梓
Owner 武汉光谷光联网科技有限公司
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