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Low birefringent optical fiber winding and fixing device for optical fibre current sensor

A low-birefringence, fiber-optic current technology, applied in the direction of voltage/current isolation, optical waveguide coupling, etc., can solve the problems of only overall replacement, high cost, inability to disassemble and maintain, and achieve easy installation, low cost, and high performance reliable effect

Active Publication Date: 2009-03-25
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

[0003] The existing all-fiber Sagnac optical interferometer mode current sensor sensing fiber is mostly fixed and packaged by integral pouring. This method is costly, and cannot be disassembled and repaired after one-time molding, so that the fiber cannot be maintained later. When there is a problem, it can only be replaced as a whole, resulting in great waste

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  • Low birefringent optical fiber winding and fixing device for optical fibre current sensor
  • Low birefringent optical fiber winding and fixing device for optical fibre current sensor
  • Low birefringent optical fiber winding and fixing device for optical fibre current sensor

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Embodiment Construction

[0019] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] figure 1 It shows the basic composition of the fiber optic current sensor based on the Sagnac optical interferometer mode, including the field fiber optic sensing head part and the electronic and optical equipment in the control room. The low birefringence fiber is used as the sensing fiber of the field sensing head. The birefringent fiber is wound into a stable circular spiral, which is sensitive to external stress during operation. According to the Faraday magneto-optical effect, a low birefringent fiber (sensing fiber) is used to measure the two beams in the all-fiber optical interferometer caused by the magnetic field generated by the measured current. The phase difference between them is used to measure the current. The invention only relates to the winding and fixing device of the low birefringence optical fiber in the field opti...

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Abstract

The invention discloses an optical fiber winding and fixing device, which is suitable for fixing low birefringent fibers in the filed of all-fiber Sagnac optical interferometer mode optical fiber current sensing. The optical fiber winding and fixing device realizes the functions of the low birefringent fibers by means of separation of fixing and packaging and through annular spiral winding; the optical fibers are protected by grooves and supports from being influenced by external stress; and packaging of a shell shields the pollution of the outside world and guarantees the measuring precision and the reliability.

Description

technical field [0001] The invention relates to a low-birefringence optical fiber winding and fixing technology, which is suitable for the field of optical fiber current sensors in the mode of an all-fiber Sagnac optical interferometer. Background technique [0002] The study of measuring current by optical methods has a research history of more than 30 years. The main types are: (1) block glass type: including magnetic collecting ring type and closed type; (2) photoelectric hybrid type: including active type and passive type; (3) all-fiber type. Among them, the most promising one is the all-fiber Sagnac optical interferometer mode. Its principle and structure are mainly taken from the famous military and civilian aerospace navigation fiber optic gyroscope (IFOG), which has high reliability, long life, low cost and refined structure. , The advantage of relatively simple process. The principle of current measurement by the all-fiber Sagnac optical interferometer mode curren...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/38G01R15/24
Inventor 李相焕蒋丙魁张开国田蘅
Owner BEIJING SIFANG JIBAO AUTOMATION
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