Optical fiber voltage sensor and adjustment method thereof

A technology of voltage sensor and optical fiber, which is applied in the field of optoelectronics, can solve the problems that the polarization direction of the polarizer and the analyzer cannot be changed accordingly, affect the detection accuracy, and temperature error, so as to overcome the error, reduce the difficulty of adjustment, and the included angle small error effect

Active Publication Date: 2013-03-13
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0006] because figure 1 In the shown sensor, the spatial light beam formed between the two self-focusing lenses has to go through multiple optical components such as polarizer, λ / 4 wave plate, BGO crystal, and analyzer, and the adjustment is very difficult
In order to reduce the difficulty of adjustment, the optical fiber usually adopts multimode fiber, and the self-focusing lens often adopts the self-focusing lens of multimode fiber, which will affect the detection accuracy
And because the BGO crystal is not ideal and there is residual natural birefringence, the polarization axis of the crystal is affected by temperature, and the polarization direction of the polarizer and analyzer cannot be changed accordingly, causing serious temperature errors

Method used

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  • Optical fiber voltage sensor and adjustment method thereof
  • Optical fiber voltage sensor and adjustment method thereof
  • Optical fiber voltage sensor and adjustment method thereof

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Embodiment 1

[0033] refer to image 3 , image 3 It is a structural schematic diagram of another embodiment of the fiber optic voltage sensor of the present invention, including a laser 31, a first polarization controller 32, an optical probe 30, a second polarization controller 33, a fast polarization state detector 34 and an electrical high-pass filter 35 . Wherein, the optical probe 30 includes an input self-focusing lens 301 , an electro-optic crystal 302 and an output self-focusing lens 303 .

[0034]Wherein, the first polarization controller 32 is arranged at the input end of the optical probe 30, and the second polarization controller 33 is arranged at the output end of the optical probe 30, that is, the input light reaches the optical probe 30 through the first polarization controller 32 , while the output light reaches the fast polarization state detector 34 through the second polarization controller 33 . The input self-focusing lens 301 receives the input light transmitted thr...

Embodiment 2

[0039] refer to Figure 4 , Figure 4 is a structural schematic diagram of another embodiment of the fiber optic voltage sensor according to the present invention, the sensor includes: a laser 41, a first polarization controller 42, a circulator 43, an optical probe 40, a second polarization controller 44, a fast polarization state detector 45 and electrical high pass filter 46. A laser source 41 emits continuous light.

[0040] In the circulator 43, the first polarization controller 42 is arranged at the first end in the direction of the static bias magnetic field of the circulator, the optical probe 40 is arranged at the second end in the direction of the static bias magnetic field of the circulator 43, and the second polarization The controller 44 is arranged at the third end of the circulator 43 in the direction of the static bias magnetic field. The circulator 43 is a multi-port device that transmits the incident wave entering any port of the port to the next port in s...

Embodiment 3

[0046] refer to Figure 5 , Figure 5 is a structural schematic diagram of another embodiment of the fiber optic voltage sensor according to the present invention, the sensor includes: a laser 51, a first polarization controller 52, a circulator 53, an optical probe 50, a second polarization controller 54, a fast polarization state detector 55 and electrical high pass filter 56. The laser source 51 emits pulsed light.

[0047] In the circulator 53, the first polarization controller 52 is arranged at the first end in the direction of the static bias magnetic field of the circulator, the optical probe 50 is arranged at the second end in the direction of the static bias magnetic field of the circulator 53, and the second polarization The controller 54 is disposed at the third end of the circulator 53 in the direction of the static bias magnetic field. The circulator 53 is a multi-port device that transmits the incident wave entering any port to the next port in sequence accord...

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Abstract

The invention discloses an optical fiber voltage sensor and an adjustment method thereof. The optical fiber voltage sensor comprises a laser, a light probe, a first polarization controller, a second polarization controller, a rapid polarization state detector and an electrical high-pass filter, wherein the laser is used for transmitting input light to the light probe through the first polarization controller; the light probe is used for sensing the change of a voltage electrical field to be measured and transmitting output light obtained after processing the input light to the rapid polarization state detector through the second polarization controller according to the sensed change; the rapid polarization state detector is used for converting the polarization state change of the output light caused by the change of the electrical field to be measured into an electrical signal and sending the electrical signal to the electrical high-pass filter; and the high-pass filter is used for filtering polarization state change caused by environment. The change of polarization state on the equator of a Poincare sphere is directly detected by using the principal state principle, the natural birefrigent effect of crystal is effectively avoided, and the problem of temperature stability is effectively solved.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to an optical fiber voltage sensor and an adjustment method thereof. Background technique [0002] In the power system with high voltage, high current and high power, the traditional electromagnetic voltage sensor has a series of shortcomings such as susceptibility to electromagnetic interference, low precision, iron core resonance and hysteresis effect, and it is difficult to meet the application requirements. Due to the advantages of strong anti-electromagnetic interference, good insulation, and large dynamic range, fiber optic sensors are widely used in high-voltage power monitoring systems. [0003] An existing type of optical fiber voltage sensor is a functional optical fiber sensor. The optical fiber is used as a sensing element for sensing voltage and as a transmission line for transmitting optical signals. The elliptical dual-mode optical fiber voltage sensor belongs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/24G02F1/095
Inventor 吴重庆刘岚岚
Owner BEIJING JIAOTONG UNIV
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