A device and method for on-line preparation of a weak grating array with continuous wavelength variation

A wavelength-changing, weak grating technology, applied in measuring devices, optical waveguide light guides, optics, etc., can solve the problems of small wavelength types and difficulty in completely eliminating grating crosstalk, so as to reduce shadow effects, improve sensing distance and multiplexing capacity , Improve the effect of multiplexing capacity

Active Publication Date: 2021-03-23
WUHAN UNIV OF TECH +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose an on-line device and method for preparing a weak grating array with continuous wavelength variation in view of the defects of few wavelength types and difficulty in completely eliminating grating crosstalk in the preparation of multi-wavelength grating arrays in the prior art, Realize the application of grating array in high-capacity dense fiber optic sensor network

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  • A device and method for on-line preparation of a weak grating array with continuous wavelength variation
  • A device and method for on-line preparation of a weak grating array with continuous wavelength variation
  • A device and method for on-line preparation of a weak grating array with continuous wavelength variation

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Embodiment 1

[0031] like figure 1 , figure 2 and image 3 The shown on-line grating array device with continuous wavelength change includes a central control system 1, a preform feeding device 2, a high-temperature heating furnace 5, an optical fiber diameter detection device 4, an online writing grating platform 3, and a double-coating curing device 6 and the optical fiber pulling device 8, the preform feeding device 2 sends the raw material preform to the high temperature heating furnace 3 at a certain speed, the output end of the drawn bare fiber corresponds to the bare fiber input end of the optical fiber diameter detection device 4, and the online The writing grating platform 5 is located between the output end of the optical fiber diameter detection device 4 and the input end of the double-coating curing device 6, and the output end of the double-coating curing device 6 is connected to the optical fiber drawing and forming device 8, and the grating optical fiber 7 is stored in a re...

Embodiment 2

[0035] On-line fabrication of grating array devices with continuous wavelength variation, including fiber drawing tower systems and on-line writing grating systems. The optical fiber drawing tower system includes a preform feeding device, a high-temperature heating furnace, a double coating and curing device, a two-stage optical fiber diameter measuring instrument, an optical fiber drawing device and a central control system for controlling each part of the unit. Through the coordinated control of various components by the central control system, the process of drawing the optical fiber preform into bare fiber and then to the finished optical fiber is realized, and finally the optical fiber is coiled through the take-up device. During this process, the drawing speed, the length and diameter of the fiber drawn can be fed back and controlled by the control system to achieve uniform drawing of the fiber. The line writing grating system includes a 193nm excimer laser, a set of opt...

Embodiment 3

[0037] Provided in this embodiment is a method for online preparation of a grating array with continuous wavelength variation, which includes the following steps:

[0038] Step 1, the central control system 1 controls the preform feeding device 2 and the high-temperature heating furnace 3 to draw the raw material preform into a bare fiber, and the diameter of the bare fiber reaches a stable state through the real-time feedback of the optical fiber diameter detection device 4. At this time, the bare fiber The drawing speed is also at a relatively stable value.

[0039] Step 2, the central control system 1 presets the laser pulse cycle and intensity of the laser writing device 9, so that the online grating writing platform starts to work and prepares to write gratings; at the same time, the central control system 1 controls the controllable telescopic slider 16 to expand and contract, and its initial The length is the shortest state and just makes the perpendicular line of the p...

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Abstract

The invention discloses a device and a method for preparing a weak grating array with continuous wavelength change online. The device mainly comprises an optical fiber drawing tower system and an online grating inscribing system, wherein a phase mask plate is mounted on one platform, accurate and rapid regulation and control of the central wavelength of an inscribing grating are achieved, a rotating platform is controlled by a central control system, a rotating angle of the phase mask plate is changed in real time according tochange of the central wavelength of the inscribing grating. According to the method for preparing the weak grating array with the continuous wavelength change online, the grating is inscribed online based on a phase mask method, and the grating array with the same orcontrollable reflectivity and the center wavelength capable of continuously changing is prepared by rotating the angle of the phase mask plate and enhancing and compensating corresponding laser pulseenergy. The device is advantaged in that the weak grating array with continuous wavelength change can be prepared, the shadow effect and crosstalk influence between the identical gratings can be effectively eliminated, and use requirements of a high-capacity dense optical fiber sensing network are further met.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating preparation, and in particular relates to an on-line preparation device and method for a weak grating array with continuous wavelength variation. Background technique [0002] With the continuous development of the Internet of Things, higher requirements are put forward for the sensor network mainly based on optical fiber sensors. At present, the optical fiber sensor network is continuously developing in the direction of precision, density and scale. The further development of a new type of high-capacity dense fiber sensor network has become a major issue in the new wave of informationization. [0003] The performance requirements for the new-generation optical fiber sensor network mainly include the following two aspects: First, the sensing capacity should be large, including a large number of measurement points and a wide range of measurement. For example, a large-scale oil pipelin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G01B21/10G01M11/00
CPCG01B21/10G01M11/30G02B6/02138
Inventor 余海湖高文静郑羽郭会勇李政颖江山郑洲王月明
Owner WUHAN UNIV OF TECH
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