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Wavelength-division-multiplexing-based multi-path fiber current sensor and control method and system thereof

A current sensor and multi-channel optical fiber technology, which is applied in the direction of using optical devices to transmit sensing components, convert sensor output, only measure current, etc., can solve problems such as high cost and complex structure.

Pending Publication Date: 2019-03-01
北京世维通光智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a multi-channel optical fiber current sensor based on wavelength division multiplexing and its control method and system, so as to solve the structure existing in the prior art when multiple current detection points are measured by using multiplexing technology Complex and costly technical issues

Method used

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  • Wavelength-division-multiplexing-based multi-path fiber current sensor and control method and system thereof

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Embodiment 1

[0045] This embodiment provides a multi-channel optical fiber current sensor based on wavelength division multiplexing, such as figure 1 As shown, it includes m sensing branches 1 , a polarized light generating device 2 , a fiber filter 3 and a photodetector 4 . Wherein, the sensing branch 1 includes an optical fiber ring 101, a fiber wave plate 102 and a reflective fiber grating 103 arranged at both ends of the optical fiber ring 101; the inside of the optical fiber ring 101 is passed through by a current-carrying conductor 104; wherein, different The reflective fiber grating 103 in the sensing branch 1 is used to reflect light beams of different wavelengths; the polarized light generating device 2 outputs m-line polarized light, and each line of linearly polarized light enters one of the transmitting beams. Sensing branch 1; each route of polarized light includes two beams of linearly polarized light whose polarization directions are perpendicular to each other; in each sens...

Embodiment 2

[0050] The multi-channel optical fiber current sensor based on wavelength division multiplexing provided in this embodiment, such as figure 2 As shown, the polarized light generation device 2 includes a light source 201, an optical transmission device 202, a polarization and coupling device 203, a polarization maintaining delay fiber ring 204 and a beam splitter 205, wherein the optical transmission device 202, its The first input end is connected to the output end of the light source 201, and its first output end is connected to the first input end of the polarizing and coupling device 203, and the optical signal sent by the light source 201 passes through the optical transmission device 202 Transmit to described polarization and coupling device 203; The first output end of described polarization and coupling device 203 is connected with the first input end of described polarization-maintaining time-delay fiber ring 204, and described polarization-maintaining time-delay fiber...

Embodiment 3

[0072] This embodiment provides a control method for the above-mentioned multi-channel optical fiber current sensor based on wavelength division multiplexing, which can be applied to a signal detection system, such as Figure 8 shown, including the following steps:

[0073] S801: Obtain the corresponding relationship between the gating wavelength of each optical channel in the optical fiber filter and the sensing branch; number each optical channel in the optical fiber filter in advance, and the distinction of optical channels is realized by the gating wavelength, corresponding The reflected light in each sensing branch corresponds to different wavelengths, and may correspond to the reflected wavelength of each sensing branch according to each optical channel in the fiber filter.

[0074] S802: turn on each optical channel in the optical fiber filter in turn according to the pre-stored setting order, and obtain the electrical signal output by the photodetector when each optica...

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Abstract

The invention relates to a wavelength-division-multiplexing-based multi-path fiber current sensor and control method and system thereof. A polarized light generation device outputs m-path linear polarized light and each path of linear polarized light enters one sensing branch; a reflective fiber grating is employed in each sensing branch to reflect a light beam; reflected light outputted by each sensing branch generates interference in the polarized light generation device and then the light is transmitted to a fiber filtering device; the fiber filtering device realizes conduction of the interference light corresponding to different sensing branches according to a set sequence; a photoelectric detector converts the interference light corresponding to different sensing branches into electric signals and current values detected in the corresponding sensing branches are calculated by backstepping based on the electric signals detected by the photoelectric detector. According to the invention, on the basis of the wavelength division multiplexing technology, the same set of fiber filtering devices and the photoelectric detector are connected with multiple sensing branches to measure thecurrents at different measuring points precisely, so that the economic costs of the fiber current sensor are saved substantially.

Description

technical field [0001] The invention relates to the technical field of optical fiber current sensing, in particular to a multi-channel optical fiber current sensor based on wavelength division multiplexing and a control method and system thereof. Background technique [0002] A fiber optic current sensor is usually composed of an acquisition module and an optical fiber sensing ring, and an acquisition module can only be connected to one optical fiber sensing ring. The fiber optic current sensor using digital closed-loop technology has an intrinsic frequency as high as hundreds of kHz, and the sampling rate is also on the order of kHz. For some applications, it is often necessary to monitor multiple current measuring points, and compared with the signal of the fiber optic current sensor Modulation frequency, the current signal to be measured is equivalent to a slow variable or DC flow, and the response speed of the measurement is not high, and sometimes even the output data r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01R19/00
CPCG01D5/35387G01R19/0092
Inventor 李建光肖浩刘东伟刘博阳雷军廉幸刚吴喆珺白东亮
Owner 北京世维通光智能科技有限公司