Sensing fiber, sensing fiber ring and through-type all-fiber current sensor
A technology of sensing optical fiber ring and sensing optical fiber, which is applied in the direction of polarized optical fiber, clad optical fiber, voltage/current isolation, etc., can solve the problems that cannot completely overcome or eliminate interference, hidden dangers, and power network system interference, and reduce the optical path light. Effects of signal loss and degradation of light polarization quality, efficiency improvement, and reliability improvement
Active Publication Date: 2013-11-20
上海康阔光智能技术有限公司
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Problems solved by technology
But in any case, increasing the number of turns of the sensing fiber can only improve the anti-interference ability of the sensing fiber ring, and cannot completely overcome or eliminate the interference of the external field and the dependence of the test current value on the position of the current bus
If there are hundreds of thousands of amperes of lightning in the outfield, it will cause serious interference and hidden dangers to the power grid system
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[0022] The sensing optical fiber of the present invention is a depolarized linear birefringence polarization-maintaining optical fiber. The characteristic of this sensing optical fiber is that it includes a helical velocity rising section 1, a helical velocity constant velocity section 2 and a helical velocity decreasing section 3 in turn, as figure 1 As shown, the spiral velocity rising section and the spiral velocity descending section are symmetrical structures, the lengths of both are equal, and the spiral velocity is symmetrically the same. The entire sensing fiber can be specifically described as starting from the helical rate of zero, and then slowly increasing to the predetermined highest helical rate after the length L1 (this section is the helical rate rising section), and then maintaining the predetermined highest helical rate (this section That is, the spiral speed constant speed section), its length is L2, and then after the length of L3, the spiral speed slowly d...
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The invention discloses a sensing fiber which comprises a spiral velocity ascending portion, a spiral velocity keeping portion and a spiral velocity descending portion in turn, wherein the spiral velocity ascending portion and the spiral velocity descending portion are symmetric, and have the same length and symmetrically same spiral velocity. The invention also discloses a sensing fiber ring made of the sensing fiber, wherein the start point of a spiral velocity ascending portion and the start point of a spiral velocity descending portion of the sensing fiber ring are superposed on a spatial diameter position; and the end point of the spiral velocity ascending portion and the end point of the spiral velocity descending portion are superposed on a spatial diameter position. The sensing fiber disclosed by the invention has the same thread pitch on any symmetric positions, and the sensing fiber ring made of the sensing fiber is equivalent to a closed loop, thus the anti-jamming performance of the sensing fiber ring and the current accuracy and stability of a tested bus are ensured. The invention also discloses a through-type all-fiber current sensor.
Description
technical field [0001] The invention relates to a sensing optical fiber. The invention also relates to a sensing fiber ring made of the sensing fiber and a straight-through all-fiber current sensor using the sensing fiber ring. Background technique [0002] All-fiber current sensors are being used in high-voltage transmission grids and power smart grids, but their long-term stability and anti-interference ability are the most critical indicators to determine their practicability and wide application. At present, there may be more than 20 research units on all-fiber-optic current sensors in China. Most of the technical solutions are transplanted from the fiber-optic gyro technology. Ultra-low birefringence single-mode fiber. Although the all-fiber-optic current sensors of individual enterprises have entered the stage of production and network operation, the repeatability and long-term stability of product performance are still facing severe tests. In fact, after the ultra-...
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IPC IPC(8): G02B6/024G01R19/00G01R15/24
Inventor 黄勇
Owner 上海康阔光智能技术有限公司