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Optical fiber safety early warning polarization control system

A polarization control, safety warning technology, applied in fiber/cable installation, optics, vibration measurement, etc., can solve problems such as instability, signal blanking, and difficulty in working effectively

Active Publication Date: 2009-05-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention is a breakthrough for the safety warning of long-distance linear targets or large-area area targets, but the disadvantage is that the optical path system of this invention has signal blanking caused by phase fading and polarization fading, which is unstable and difficult to be effective Work

Method used

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  • Optical fiber safety early warning polarization control system
  • Optical fiber safety early warning polarization control system
  • Optical fiber safety early warning polarization control system

Examples

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Embodiment 1

[0040] Embodiment 1. Use this example to illustrate the specific implementation of the present invention and further illustrate the present invention. This example is an experimental prototype, its composition is as follows figure 1 As shown, the circuit as image 3 shown. The polarization modulator 202 is connected in series between the continuous monochromatic laser 101 and the multiplexer / demultiplexer 203 connected by optical fibers, the multiplexer / demultiplexer 203 connects three optical fibers 1, 2, 3 to the multiplexer / demultiplexer 204 respectively, the multiplexer / demultiplexer 203, The multiplexer / demultiplexer 204 and the optical fiber 1 and the optical fiber 2 form a Mach-Zehnder (Mach-Zehnder) optical fiber interferometer. The input of the polarization modulator 202 is connected to the output of the polarization controller 201 by wires, the input of the polarization controller 201 is connected to the output of the polarization control host 409, and the output o...

Embodiment 2

[0045] Embodiment 2. This example is an experimental prototype, and its composition is as figure 2 As shown, the circuit as Figure 4 shown. After the laser 101 is connected to the polarization scrambler 410 through an optical fiber, the optical fiber is connected to the multiplexer / demultiplexer 204 and three optical fibers 1, 2, and 3 to form the multiplexer / demultiplexer 203 of the Mach-Zehnder fiber optic interferometer , and the multiplexer / demultiplexer 203 is respectively connected to the input of the polarizer 412 and the polarizer 413 by an optical fiber, and the output of the polarizer 412 and the polarizer 413 is connected to the input of the polarization detector 407 and the polarization detector 408, and the polarization detector Both the output of 407 and the polarization detector 408 are connected to the signal processing unit 411 by electrical signal lines.

[0046] Among them, single-frequency laser 101 selected model: OHERAS ADJUSTIK HP E15; polarization s...

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Abstract

The invention is an optic fiber safety prewarning polarization control system of buried tube, construction or important establishment and area. A polarization modulator [202] is between laser [101] and filter [203] which composes Mach-Zehnder fibre-optical interometer with filter [204], optic fiber [1], optic fiber [2], the filter [203] is connected with optoelectronic detector [407], [408], then it is connected with signal process circuit [409], the output of signal process circuit [409] is connected with polarization modulator [202] and polarization controller [201] of the phase modulator [206] connected with optic fiber [1] or [2]. Then the laser [101] is connected with harassing polarimeter [410], then connected with filter [203], the filter [203] is separately connected with checking polarimeter [412], [413], output of thechecking polarimeter [412], [413] is separately connected with input of the polarization detector [407], [408], output of the polarization detector [407], [408] is connected with signal process unit [411].

Description

technical field [0001] The invention relates to an optical fiber safety early warning polarization control system for safety protection and early warning of buried pipelines or structures or important facilities and areas, and relates to the technical fields of mechanical vibration measurement, impact measurement and pipeline systems. Background technique [0002] For substances such as oil, natural gas, refined oil, coal slurry and water, pipeline transportation is a safe, economical and efficient transportation method, and it is playing an increasingly important role in the global transportation industry, especially in petroleum, finished products Oil and natural gas play an extremely important role in the transportation of flammable and explosive energy substances with high transaction value. In our country, at least thousands of kilometers of pipelines are built every year. It can be said that pipelines are the main arteries of energy transportation. Oil, refined oil and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/50G02B27/28G01H1/00G01P15/00
Inventor 张金权王小军焦书浩王飞方德学霍峰王赢闫会朋杨文明历宇林晓舒
Owner BC P INC CHINA NAT PETROLEUM CORP
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