CN201965220U - Space magnetic field detector - Google Patents
Space magnetic field detector Download PDFInfo
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- CN201965220U CN201965220U CN2011200564788U CN201120056478U CN201965220U CN 201965220 U CN201965220 U CN 201965220U CN 2011200564788 U CN2011200564788 U CN 2011200564788U CN 201120056478 U CN201120056478 U CN 201120056478U CN 201965220 U CN201965220 U CN 201965220U
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Abstract
The utility model discloses a space magnetic field detector, which comprises a wideband laser light source, an isolator, a 1* 3 optical beam splitter, three magnetic field detection probes, three optical detectors, three amplifiers, and a set of signal-processing computer system, wherein the magnetic field detection probe is formed by sequentially connecting a gradient index lens at the input end thereof, a polarizer, a magneto-optical crystal at the middle thereof, an analyzer at the output end thereof, and a gradient index lens, and an angle of 45 DEG is formed between the polarization plane of the polarizer and that of the analyzer. Every two of the three optical detectors are mutually perpendicular, and every probe can detect the positive and negative directions in the axial direction of the space magnetic field and the strength thereof corresponding to the space magnetic field, thereby detecting the magnetic field strength and direction of any point in the space. The space magnetic field detector provided by the utility model has the advantages of electromagnetic interference resistance, strong real-time property, high precision and sensitivity.
Description
Technical Field
The utility model relates to an optical fiber sensing field especially relates to a space magnetic field detector.
Background
Since the 20 th century, rapid development of science and technology, household appliances, medical instruments, power electronics, industrial automation, information industry, and the like have also rapidly progressed. While these emerging scientific technologies bring convenience to humans, human living spaces are also placed in increasingly complex magnetic field environments. When the magnetic field strength is only about 500 milligauss, human beings can live safely, but as various modern devices bring about stronger and stronger magnetic fields, whether human beings can live normally and healthily has attracted more and more attention. Meanwhile, when the magnetic field intensity is too large, damage to the electronic and electrical equipment may also be caused.
Meanwhile, as the photoelectronic technology is more and more widely applied in the emerging high-tech field, various magneto-optical devices using the magneto-optical effect principle as the background gradually show unique performance and extremely wide application prospects. The magneto-optical effect was especially found by the british physicist Faraday (Faraday) in 1845, and we call the crystal magneto-optical rotation effect of Faraday effect to attract attention. When linearly polarized light passes through a magneto-optical medium placed in a magnetic field in the direction of the magnetic field, the phenomenon in which the plane of deflection is deflected is called the magneto-optical effect, i.e. the faraday rotation effect. The faraday optical rotation effect can be divided into a left rotation effect and a right rotation effect: when linearly polarized light is transmitted along the direction of the magnetic field, the vibration surface is rotated leftwards; the vibration plane will be right-handed when the light beam propagates against the magnetic field. Therefore, the detection of the magnetic field intensity and direction can be realized by utilizing the Faraday effect of the magneto-optical crystal and the light transmission characteristic of the polarizer analyzer. Meanwhile, the method has extremely practical significance for detecting the magnetic field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a space magnetic field detector, based on the utility model discloses, can realize the detection of the magnetic field intensity and the direction of any point in space.
The utility model relates to a space magnetic field detector, which comprises a wide spectrum laser light source, an isolator, a 1X 3 light beam splitter, three magnetic field detection probes, three light detectors, three amplifiers and a computer system; the wide-spectrum laser light source, the isolator and the 1 x 3 optical beam splitter are sequentially connected through a single-mode optical fiber; the axes of the three magnetic field detection probes are mutually vertical pairwise, respectively correspond to an x axis, a y axis and a z axis in a space rectangular coordinate system, and are used for detecting the positive and negative directions and the strength of the space magnetic field corresponding to the self axial direction; the input end of each magnetic field detection probe is connected with one output end of the 1 x 3 optical beam splitter; and the output end of each magnetic field detection probe, the optical amplifier and the computer system are connected in sequence.
In the above-mentioned spatial magnetic field detector, it is preferable that the magnetic field detection probe includes: the device comprises a first gradient variable refractive index lens, a polarizer, a magneto-optical crystal, an analyzer and a second gradient variable refractive index lens which are sequentially connected; and the polarization surface of the polarizer and the polarization surface of the analyzer form an included angle of 45 degrees.
The utility model discloses in, two liang mutually perpendicular of three magnetic field test probe, and every probe can both realize that the space magnetic field corresponds the detection at its self axial positive, negative direction and intensity to realize the detection of the magnetic field intensity of any point in space and direction. Furthermore, the utility model has the advantages of anti-electromagnetic interference, high precision and high sensitivity.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the space magnetic field detector of the present invention;
fig. 2 is a schematic structural diagram of a magnetic field detection probe according to an embodiment of the present invention;
in the figure, 101-a wide spectrum laser light source, 102-an isolator, 103-1X 3 optical beam splitter, 1041-a magnetic field detection probe, 1042-a magnetic field detection probe, 1043-a magnetic field detection probe, 1051-an optical detector, 1052-an optical detector, 1053-an optical detector, 1061-an amplifier, 1062-an amplifier, 1063-an amplifier, 107-a computer system, a magneto-optical crystal 201, 202-a gradient variable refractive index lens, 203-a polarizer, 204-an analyzer and 205-a common single mode fiber.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The utility model discloses space magnetic field detector utilizes magneto optical rotation characteristic and the analyzer of magneto-optic crystal to carry out real-time detection to the transmission characteristic of light. The system comprises a wide-spectrum laser light source, an isolator, a 1 x 3 optical beam splitter, three magnetic field detection probes, three optical detectors, three amplifiers and a computer system for processing signals; the wide-spectrum laser light source provides a light source with required bandwidth, and the stability of the wide-spectrum light source also determines the detection precision and stability of the whole detection system. The input end of the isolator is connected with the output end of the wide-spectrum light source, so that the wide-spectrum light source is not influenced by backward reflection and scattered light of a light path in the system, and the system can stably work when in work. The input end of the 1 multiplied by 3 optical beam splitter is connected with the output end of the broadband filter, and the input light is equally divided into 3 parts and output from the output end. The three magnetic field detection probes are respectively connected with the output ends of the 3 polarizers, each probe is formed by sequentially connecting a gradient variable refractive index lens at the input end, a polarizer, a magneto-optical crystal in the middle, an analyzer at the output end and a gradient variable refractive index lens, and the polarization plane of the polarizer and the polarization plane of the analyzer form an angle of 45 degrees. The three probes are axially vertical to each other in pairs, and can be respectively positioned on an x axis, a y axis and a z axis in a rectangular coordinate system. At the moment, the space magnetic field corresponds to the axis of the magneto-optical crystal in any magnetic field detection probe, the increase and decrease of the optical power of the output end are used for judging that the direction of the magnetic field corresponds to the positive and negative directions of the axial direction of the magneto-optical crystal, and the increase and decrease of the optical power of the output end are used for judging the strength of the space magnetic field corresponding to the axial direction of the magneto-optical crystal. The strength and direction of the space magnetic field can be obtained through the computer statistics calculation of the system by synthesizing the change amount and the change direction of the values of the x axis, the y axis and the z axis in the rectangular coordinate system respectively corresponding to the three magnetic field detection probes which are received by the three photoelectric detectors and are mutually perpendicular. The three photoelectric detectors receive the light output by the three magnetic field detection probes respectively, amplify the light through the three amplifiers respectively, and input the light to a computer system for operation.
As shown with reference to fig. 1 and 2. The method comprises the following steps: a broad spectrum laser light source 101, an isolator 102, a 1 × 3 optical beam splitter 103, magnetic field detection probes 1041, 1042, 1043, optical detectors 1051, 1052, 1053, amplifiers 1061, 1062, 1063, and a computer system 107. The three magnetic field detection probes 1041, 1042, 1043 are formed by sequentially connecting an input end with a gradient refractive index lens 202, a polarizer 203, a middle magneto-optical crystal 201, an output end with an analyzer 204, and a gradient refractive index lens 202, wherein the polarization plane of the polarizer and the polarization plane of the analyzer form an angle of 45 degrees, and the two ends of the magnetic field detection probes 1041, 1042, 1043 are directly butted with the gradient refractive index lens 202 through a common single mode fiber 205.
The wide-spectrum laser light source 101, the isolator 102 and the 1 × 3 optical beam splitter 103 are connected through a common single mode fiber, the three magnetic field detection probes 1041, 1042 and 1043 are respectively connected with three output ports of the 1 × 3 optical beam splitter 103, and an output end of the magnetic field detection probe 104 is connected with the common single mode fiber. The three optical detectors 1051, 1052 and 1053 respectively receive the optical power output by the magnetic field detection probes 1041, 1042 and 1043 through the single mode fiber, and then the optical power is amplified by the amplifiers 1061, 1062 and 1063 to enter the computer system 107 for processing.
The three magnetic field detection probes 1041, 1042, 1043 are axially perpendicular to each other in pairs, and correspond to the x axis, the y axis, and the z axis in the rectangular coordinate system, and the increase and decrease of the values obtained by the photodetectors 1051, 1052, and 1053 when detecting the optical power respectively obtain the positive and negative of the space magnetic field corresponding to the axial direction of the magneto-optical crystal 201 in each detection probe, that is, the positive and negative directions corresponding to the axial direction in the rectangular coordinate system can be obtained; the magnitude of the change in optical power obtained by the photodetector 105 in detecting optical power can be scaled to obtain the intensity of the spatial magnetic field in the magneto-optical crystal 201. After the output optical power signals of the magnetic field detection probes respectively corresponding to the x axis, the y axis and the z axis, which are detected by the three amplified photodetectors, are comprehensively processed by the computer system 107, the strength and the direction of the magnetic field in the space can be obtained.
The space magnetic field detector provided by the present invention is introduced in detail above, and the principle and the implementation mode of the present invention are explained by applying the specific embodiments herein, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present description should not be construed as a limitation of the present invention.
Claims (2)
1. A spatial magnetic field detector is characterized in that,
the system comprises a wide-spectrum laser light source, an isolator, a 1 x 3 optical beam splitter, three magnetic field detection probes, three optical detectors, three amplifiers and a computer system; wherein,
the wide-spectrum laser light source, the isolator and the 1 x 3 optical beam splitter are sequentially connected through a single-mode optical fiber; and,
the axes of the three magnetic field detection probes are mutually vertical in pairs and are used for detecting the positive and negative directions and the strength of the space magnetic field corresponding to the self axial direction;
the input end of each magnetic field detection probe is connected with one output end of the 1 x 3 optical beam splitter; and the output end of each magnetic field detection probe, the optical amplifier and the computer system are connected in sequence.
2. The spatial magnetic field probe according to claim 1,
the magnetic field detection probe includes: the device comprises a first gradient variable refractive index lens, a polarizer, a magneto-optical crystal, an analyzer and a second gradient variable refractive index lens which are sequentially connected; and the polarization surface of the polarizer and the polarization surface of the analyzer form an included angle of 45 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200564788U CN201965220U (en) | 2011-03-04 | 2011-03-04 | Space magnetic field detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200564788U CN201965220U (en) | 2011-03-04 | 2011-03-04 | Space magnetic field detector |
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| CN201965220U true CN201965220U (en) | 2011-09-07 |
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| CN2011200564788U Expired - Fee Related CN201965220U (en) | 2011-03-04 | 2011-03-04 | Space magnetic field detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105541A (en) * | 2013-01-30 | 2013-05-15 | 中国电子科技集团公司第三十八研究所 | Near field probe used for detecting electromagnetic interference radiation performance and application method thereof |
| CN104698410A (en) * | 2015-03-02 | 2015-06-10 | 北京大学 | Atomic magnetic sensor for magnetometer and method of removing detection dead zones of magnetometer |
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2011
- 2011-03-04 CN CN2011200564788U patent/CN201965220U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105541A (en) * | 2013-01-30 | 2013-05-15 | 中国电子科技集团公司第三十八研究所 | Near field probe used for detecting electromagnetic interference radiation performance and application method thereof |
| CN103105541B (en) * | 2013-01-30 | 2015-03-25 | 中国电子科技集团公司第三十八研究所 | Near field probe used for detecting electromagnetic interference radiation performance and application method thereof |
| CN104698410A (en) * | 2015-03-02 | 2015-06-10 | 北京大学 | Atomic magnetic sensor for magnetometer and method of removing detection dead zones of magnetometer |
| CN104698410B (en) * | 2015-03-02 | 2019-03-01 | 北京大学 | The method of atom Magnetic Sensor and elimination magnetometer detection blind area for magnetometer |
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Granted publication date: 20110907 Termination date: 20120304 |