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Micro-sensing optical unit and embedded application thereof

A sensing light and micro-technology, applied in electrical components, optical devices, instruments, etc., can solve the problems of low sensitivity and poor real-time performance of optical fiber distributed sensing, and achieve real-time response embedding technology, high sensitivity, and improved sensitivity. Effect

Active Publication Date: 2011-04-13
江苏通光电子线缆股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the optical fiber distributed sensing technology using conventional communication optical cables or optical units has low sensitivity and poor real-time performance. Obviously, it is not ideal to use conventional communication optical cables as distributed sensing.

Method used

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  • Micro-sensing optical unit and embedded application thereof
  • Micro-sensing optical unit and embedded application thereof
  • Micro-sensing optical unit and embedded application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 and 2 The micro-shaped sensing light unit shown is embedded inside or outside the cable, and it includes a micro-shaped sensing light unit body, which includes a sensing optical fiber 1, and the sensing optical fiber 1 is covered with a sealed Stainless steel tube 3, the stainless steel tube 3 is filled with water-blocking fiber paste 2; the number of optical fibers 1 for sensing is 1 or 2 or more, and the excess length of the optical fiber in the stainless steel tube 3 is within the range: 0≤excess length<0.03% . The stainless steel pipe 3 may also be coated with a sheath 4 .

[0029] The micro-shaped sensing light unit is manufactured by special equipment. The protective tube of the micro-shaped sensing light unit is usually made of a stainless steel tube 3 with a thickness of 0.15mm-0.2mm, which is formed, laser welded, and sized and drawn. Simultaneously input the sensing optical fiber 1 and the water-blocking fiber paste 2, the number of the sensin...

Embodiment 2

[0031] like image 3 and 4 As shown, the cable for temperature measurement using the micro-sensing light unit described in Embodiment 1, the cable includes a cable conductor core wire 7 and a cable outer sheath 8, and also includes a micro-sensing light unit, a stainless steel tube of the micro-sensing light unit 3 is wrapped with a sheath 4, and the miniature sensing light unit 5 with the sheath and the cable conductor core wire 7 are synchronously twisted inside the cable or wound outside the outer sheath 8 of the cable. In this embodiment, due to the insulation requirements of the cable, the micro-shaped sensing light unit 5 with a sheath is generally used. image 3 It is a schematic diagram of the cable structure for detecting the internal temperature of the cable. The sensing light unit 5 with a sheath can be one or more. image 3 In the middle are three sensing light units 5 with sheaths that are twisted synchronously with the cable core wires. Figure 4 It is a schem...

Embodiment 3

[0033] like Figure 5As shown, the duct optical cable that utilizes the micro-shaped sensing light unit described in Embodiment 1 for strain sensing, the duct optical cable includes a conventional communication optical unit 9 and an optical cable outer sheath 11, and also includes a miniature sensing light unit, a miniature sensing light unit Without a sheath, the miniature sensing light unit 6 without a sheath is twisted synchronously with the conventional communication light unit 9 inside the duct optical cable. The outer diameter of the micro-shaped sensing light unit 6 without a sheath fits with the clearance of the conventional communication light unit 9 , making it tangent to the circular trajectory formed by the conventional communication light unit 9 .

[0034] like Image 6 As shown, the buried optical cable that utilizes the micro-shaped sensing optical unit described in Embodiment 1 for strain sensing, the buried optical cable includes a conventional communication ...

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Abstract

The invention relates to a micro-sensing optical unit which is embedded inside or outside a cable, comprises a micro-sensing optical unit body and is characterized in that the micro-sensing optical unit body comprises an optical fiber for sensing, wherein a sealed stainless steel pipe is coated outside the optical fiber for sensing, and water-blocking fiber paste is filled in the stainless steel pipe; the number of the optical fiber for sensing can be 1 or two or plural, and the fiber excess length range in the stainless steel pipe is that the excess length is not less than 0 and less than 0.03%. The invention further relates to a cable, an optical cable, an aerial bare line and a submarine cable applying the structure in an embedded manner. The micro-sensing optical unit has high sensitivity to measured information of outside and can respond to temperature and strain in real time, the embedding process is simple and does not change the original performances of the optical cable, the temperature change can be reflected in a real-time manner, the smaller fiber excess length in the pipe can reduce the region of a stress and strain window of the optical fiber, the sensitivity to external stress (strain) reaction of the optical fiber can be improved, and the micro-sensing optical unit can not change the original structure and the performances of the optical cable and be embedded in the appropriate part of the optical cable and the cable.

Description

technical field [0001] The invention relates to distributed on-line measurement and sensing of optical fibers, in particular to a micro-shaped sensing light unit and embedded cables, optical cables, overhead bare wires and sea cables using the structure. Background technique [0002] Optical fiber sensing technology is a new type of sensing technology that uses light as the carrier and optical fiber as the medium to perceive external information. Using various characteristics of optical fiber, optical fiber can be made into various sensors, but it is distributed in points in space. In addition to the discontinuous measurement points, additional transmission lines (optical cables or cables) are required. [0003] The distributed optical fiber measurement sensing system can provide the measured information in the form of a continuous function of distance over the continuous length of the entire optical fiber. Used to detect the transmission of information. In recent years, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01B11/16H01B7/14H01B11/22G02B6/44
Inventor 徐军黄俊华
Owner 江苏通光电子线缆股份有限公司
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