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Photoelectric oscillator for measuring magnetic field and measuring method thereof

A photoelectric oscillator and photodetector technology, applied in the field of microwave photonics technology and sensing measurement, can solve the problems of complex magnetic field measurement demodulation method, poor stability, low sensitivity, etc., to reduce complexity, cost, and stability. The effect of improving and improving the sensitivity

Inactive Publication Date: 2019-05-28
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a photoelectric oscillator for measuring magnetic field and its measuring method to solve the problems of complex demodulation mode, low sensitivity and poor stability of magnetic field measurement

Method used

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  • Photoelectric oscillator for measuring magnetic field and measuring method thereof
  • Photoelectric oscillator for measuring magnetic field and measuring method thereof
  • Photoelectric oscillator for measuring magnetic field and measuring method thereof

Examples

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Embodiment 1

[0047] figure 1 It is a structural schematic diagram of the photoelectric oscillator for measuring the magnetic field of the present embodiment, referring to figure 1 , the device includes: a light source 1, a first optical coupler 2, an adjustable optical delay module 3, an optical fiber sensor head 4 with a magnetostrictive material, a second optical coupler 5, an electro-optic modulator 6, a dispersion element 7. Optical amplifier 8, photodetector 9, microwave amplifier 10 and power divider 11.

[0048] A Mach-Zehnder Interferometer (MZI) is formed between the two optical couplers, and one arm of the MZI includes an optical fiber sensing head 4 with a magnetostrictive material, which is used as the sensing arm, namely It is the optical fiber of the sensor head, wherein the optical fiber can be single-mode optical fiber, few-mode optical fiber, D-type optical fiber or other stress-sensitive optical fiber, which is used to induce the corresponding stretching deformation of t...

Embodiment 2

[0063] figure 2 It is a structural schematic diagram of the photoelectric oscillator for measuring the magnetic field of the present embodiment, referring to figure 2 , the device includes: a light source 1, a first optical coupler 2, an adjustable optical delay module 3, an optical fiber sensor head 4 with a magnetostrictive material, a second optical coupler 5, an electro-optic modulator 6, a dispersion element 7. Optical amplifier 8, photodetector 9, microwave amplifier 10 and power divider 11.

[0064] The specific principle and implementation of the photoelectric oscillator-based humidity measurement using the device of this embodiment are similar to the description in the first embodiment above, and will not be repeated here.

[0065] The differences between this embodiment and Embodiment 1 are:

[0066] In this embodiment, the electro-optic modulator 6 is located on one arm of the MZI, and the optical signal output by the light source 1 enters the MZI formed by the ...

Embodiment 3

[0069] This embodiment provides a method for measuring a magnetic field by a photoelectric oscillator, including the following steps:

[0070] 1) After the optical signal sent by the light source is split by the first optical coupler, it is transmitted along the two arms of the MZI, and the length of the two arms is matched by an adjustable optical delay line, and an initial signal is generated when no external magnetic field is applied. The arm length difference is used to generate an initial oscillation frequency, and the second optical coupler combines the optical signals on the two arms of the MZI to cause interference;

[0071]2) The interfering optical signal is modulated by an electro-optical modulator to obtain a modulated signal. The modulated signal is delayed by a dispersive element and amplified by an optical amplifier, then converted into an electrical signal by a photodetector, and then amplified by a microwave amplifier. The power divider is divided into two par...

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Abstract

The invention provides a photoelectric oscillator for measuring a magnetic field and a measuring method thereof. The oscillator comprises a light source, a first optical coupler, an adjustable opticaldelay module, an optical fiber sensing head with a magnetostrictive material, a second optical coupler, an electro-optic modulator, a dispersive element, an optical amplifier, a photodetector, a microwave amplifier and a power splitter; the first optical coupler and the second optical coupler and the optical fiber sensing head with the magnetostrictive material therebetween and the adjustable optical delay module form a Mach-Zehnder interferometer MZI; the optical fiber sensing head with the magnetostrictive material is located in one arm of the MZI for sensing the magnetic field for corresponding telescopic deformation. The oscillator utilizes a microwave photon technology to perceive the magnitude of the magnetic field through the optical fiber, converts the magnetic field change into the change of the frequency of the oscillation signal of the photoelectric oscillator, and solves the problems that a magnetic field measurement demodulation method is complicated, the sensitivity is low and the stability is poor.

Description

technical field [0001] The invention relates to the field of microwave photonics technology and sensor measurement, in particular to a photoelectric oscillator for measuring magnetic field and a measurement method thereof. Background technique [0002] Microwave photonics is an emerging interdisciplinary subject that combines microwave technology and photonics, and the optoelectronic oscillator is an important device in microwave photonics. The earliest optoelectronic hybrid oscillator was proposed by A.Neyer and E.Voges in 1982. The photoelectric oscillator structure in the prior art usually includes a laser source, an intensity modulator, a long optical fiber, an optical filter or a microwave filter, a microwave amplifier or an optical amplifier, a photoelectric detector, etc. Devices, use these components to build a positive feedback loop to achieve self-oscillation. The optoelectronic oscillator utilizes the high bandwidth of optical devices and the high energy storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
Inventor 王目光张乃晗武蓓蕾牟宏谦韩梦瑶魏淮
Owner BEIJING JIAOTONG UNIV
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