Nonlinear interference type magnetic field sensor
A magnetic field sensor, interference-type technology, applied in the size/direction of the magnetic field, the use of magneto-optical equipment for magnetic field measurement, instruments and other directions, can solve the problem of limited measurement sensitivity shot noise, etc., to achieve high rate of change, high sensitivity , The effect of high magnetic field strength detection
Active Publication Date: 2020-12-11
CHINA JILIANG UNIV
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to solve the limitation that the measurement sensitivity of the existing linear interferometer is limited by shot noise, and to provide a solution for a nonlinear interferometric magnetic field sensor that can break through this limitation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] Below in conjunction with specific example and accompanying drawing, the present invention will be further described:
[0019] Such as figure 1 Shown is a schematic diagram of a specific device of the magnetic field sensor based on the nonlinear interference effect of the present invention. The principle of the present invention is described and described below only with this example, but this example is not intended to limit the scope of the present invention. In this example, the specific devices include: pump light one 1; seed light 2; coarse wavelength division multiplexers 3, 5, 8, 10; dispersion-shifted optical fibers 4, 9; magnetostrictive element 6; pump light two 7; Photodetectors 11, 12; Oscilloscope 13. Among them, the coarse wavelength division multiplexer 3, the dispersion-shifted optical fiber 4, and the coarse wavelength division multiplexer 5 constitute the parametric amplifier FOPA1; the coarse wavelength division multiplexer 8, the dispersion-shifted ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| Wavelength | aaaaa | aaaaa |
Login to View More
Abstract
The invention provides a magnetic field sensor based on a nonlinear interferometer. The magnetic field sensor comprises first pump light, seed light, a first optical fiber parameter amplifier, a second optical fiber parameter amplifier, a magnetostriction element and second pump light. The first optical fiber parameter amplifier plays a beam splitting role, the second optical fiber parameter amplifier plays a beam combining role, each of the first optical fiber parameter amplifier and the second optical fiber parameter amplifier is composed of two coarse wavelength division multiplexers and adispersion displacement optical fiber located in the middle, the wavelength of pump light is 1550 nm and located in an abnormal dispersion area of the dispersion displacement optical fiber, and phasematching conditions occurring in the four-wave mixing process in the optical fiber are met. The idler frequency light single-mode optical fiber at the output end of the optical fiber parametric amplifier playing a beam splitting role generates strain under the action of a magnetic field to cause phase change, so that the phase uncertainty of idler frequency light at the output end of the optical fiber parametric amplifier playing a beam combining role is changed; and magnetic field sensing with higher sensitivity can be realized by measuring the phase uncertainty of the idler frequency light.The sensor provided by the invention has the characteristic of high sensitivity.
Description
technical field [0001] The invention provides a nonlinear interference magnetic field sensor and belongs to the technical field of optical fiber sensing. Background technique [0002] Since there is no nonlinear optical device in the linear fiber interferometer, the magnetic field measurement accuracy of the magnetic field sensor based on the linear fiber interferometer is limited by the standard quantum limit, that is to say, the minimum measurement accuracy of the magnetic field is limited. For the magnetic field Small changes are often difficult to perceive. In order to break through this limitation, the present invention replaces the linear beam splitter in the linear optical fiber interferometer with a nonlinear optical device, and the measurement sensitivity can be greatly improved only by inputting a coherent state. [0003] The beam splitter and combiner of the nonlinear interferometer utilizes the four-wave mixing effect in the optical fiber, which is a parametric ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01R33/032
CPCG01R33/0327Y02A90/30
Inventor 王海龙倪智豪付忠星赵春柳
Owner CHINA JILIANG UNIV