Optical fibre magnetic field sensor employing reflecting reciprocal light path
A magnetic field sensor, reflective technology, applied in the field of optical sensing, can solve the problems of interference temperature, vibration sensitivity, poor environmental adaptability, etc., to achieve the effect of improving environmental adaptability
Inactive Publication Date: 2012-06-20
BEIHANG UNIV
View PDF5 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The present invention solves the problem that existing optical fiber weak magnetic field sensors are sensitive to external environmental disturbances (such as temperature, vibration, etc.) and have poor environmental adaptability
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
[0010] The specific embodiment of the present invention provides a fiber optic magnetic field sensor using a reflective reciprocal optical path, and there are two implementation schemes, specifically:
[0011] The first implementation is as figure 1 As shown, it consists of a light source 1, a splitter 2, a polarizer 3, a phase modulator 4, a delay fiber 5, a Faraday rotator 6, a transducer 7, a compensation fiber 8, a mirror 9, and a photodetector 10.
[0012] The optical signal is divided into two paths at the input end of the splitter: one is the pigtail fiber of the light source 1 and an input fiber of the splitter 2 are fused together, and the other is the pigtail fiber of the photodetector 10 and the fiber optic of the splitter 2 The other input end optical fibers are fused together; the output end optical fiber of the splitter 2 is fused with the polarizer 3, and the polarization maintaining optical fiber at the output end of the polarizer 3 is fused with the input end ...
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
Login to View More Abstract
The invention discloses an optical fibre magnetic field sensor scheme employing a reflecting reciprocal light path. In the scheme, firstly light emitted by a broadband light source is polarized into linear polarized light by a polarizer after the light passes through a coupler; then the linear polarized light is formed into two light beams which are orthometric through a 45-degree melting point, and the two light beams are modulated by a phase modulator, respectively, are rotated for 45 degrees by a faraday rotator after passing through a delay optical fibre, and then enter into a transducer, wherein because a polarization-maintaining optical fibre is adopted for the transducer, the transducer induces a magnetic field to be detected and the polarization-maintaining optical fibre is modulated, so that a phase change is generated between two modes for transmitting light; then the two light beams enter into a reciprocal compensation optical fibre at 90 degrees to compensate an optical path difference generated due to double refraction of the polarization-maintaining optical fibre, pass through the transducer for the second time by reflection so as to double a sensitive signal, and are rotated for 45 degrees by the faraday rotator again; and finally the two light beams in two modes undergo interferences on the polarizer. The light with interference phase information is returned to a probe and then detected by a signal processing circuit. In the same way, the same purpose can be achieved by adopting the light path of a Y-type integrated optical modulator.
Description
technical field [0001] The invention relates to a fiber optic magnetic field sensor using a reflective reciprocal optical path for detecting a magnetic field by interfering light phase, and belongs to the technical field of light sensing. Background technique [0002] With the development of science and technology and society, the application of weak magnetic measurement technology in the fields of national defense construction, national economy and biomedicine is becoming more and more extensive. In the military field, with the development of submarine noise reduction technology in various countries, traditional sonar submarine detection can no longer meet the needs of modern anti-submarine warfare, and various non-acoustic submarine detection technologies have become research hotspots in various countries. Magnetic anomaly detection is considered to be the most reliable means to classify targets and improve the resolution of submarine attacks. At present, almost all advanc...
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): G01R33/032G02B6/27G02B6/255
Inventor 王夏霄于佳李传生冯秀娟李立京邬战军张晞李彦
Owner BEIHANG UNIV