CN214895755U - Weak magnetic field sensing system based on double-cladding hollow-core photonic crystal fiber - Google Patents
Weak magnetic field sensing system based on double-cladding hollow-core photonic crystal fiber Download PDFInfo
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- CN214895755U CN214895755U CN202120865424.XU CN202120865424U CN214895755U CN 214895755 U CN214895755 U CN 214895755U CN 202120865424 U CN202120865424 U CN 202120865424U CN 214895755 U CN214895755 U CN 214895755U
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Abstract
The utility model relates to a weak magnetic field sensing system based on double-clad hollow photonic crystal fiber, including atom steam chamber, polarization deflector, circular polarization pumping light source, post vector detection light source, the empty cavity of inlayer, interior photoelectric detector array, the empty cavity of skin, outer photoelectric detector array, signal analysis processing module, wherein: the circular polarization pump light source emits pump light beams, the propagation direction of the light beams is changed after passing through the polarization deflector, and the light beams enter the atomic vapor chamber to be reflected for multiple times to generate dynamic atomic vapor pumping; after passing through a polarization deflector, the radial and angular component proportion of a light beam emitted by the column vector detection light source is changed, and the light beam is partially transmitted after being incident into an atomic vapor chamber and being reflected for multiple times; the transmitted light beams are received by the inner photoelectric detector array and the outer photoelectric detector array to obtain fine spatial distribution information, and the fine spatial distribution information is analyzed by the signal analysis processing module to realize high spatial resolution magnetic field sensing detection. The utility model has the characteristics of small, space omnidirectional measurement, sensitivity height.
Description
Technical Field
The utility model relates to a weak magnetic field sensing system based on double-clad hollow photonic crystal fiber, especially one kind is arranged in the high sensitivity magnetic field detection in fields such as magnetic navigation, nondestructive test, anti-fake technique, criminal investigation, brain science, life medical treatment, disease are diagnose, psychology, wisdom perception, resource investigation, ocean engineering, quantum sensing.
Background
The magnetic field detection system refers to various instruments and systems for measuring magnetic fields including instruments, and can also be called a magnetometer and a gaussmeter, in the international system of units, the physical quantity describing the magnetic field is magnetic induction intensity, the unit is tesla, the unit is commonly used for nanot (nT) in geoscience as a measurement unit, and the unit is commonly used for engineering is gauss. Magnetic field detection is widely applied to the fields of biomedicine, geological survey, resource exploration, earthquake prediction, industry, navigation positioning, material analysis, ocean engineering, quantum sensing, brain magnetic core magnetism and the like, and along with the improvement of detection requirements, the requirement on magnetic detection performance is more urgent. For example, in the field of Magnetoencephalogram (MEG) detection, a magnetoencephalogram detection device is a brain function image detection technology completely non-invasive and non-radioactive to a human body, and plays a very important role in the fields of brain science, life medical treatment, biotechnology, health detection, disease diagnosis and treatment, man-machine interaction, intelligent control, behavior organization and the like, the magnetoencephalogram obtained by magnetic field detection can be applied to the researches of epilepsy diagnosis, preoperative positioning of an epileptogenic focus, neurosurgical preoperative brain function area positioning, ischemic cerebrovascular disease prediction and diagnosis, diagnosis of psychosis and mental disorder disease, post-traumatic brain function assessment and identification, judicial identification and lie detection application, language, vision, hearing, somatosensory induction and the like, and a high-performance magnetic field detection system has important research significance and wide application value.
In the prior art, there are magnetic field detection methods including an Elekta Neuromag TRIUX model, which has been commercialized by Elekta corporation, a multinational company, sweden; MagView model magnetoencephalograph instrument, manufactured by Tristan corporation, headquartered in the United states. For prior art, see U.S. patent, entitled high-recovery genetic engineering systems, compositions and methods, U.S. Pat. No. 5, 2142453, 3, issued for 4/32 days 2002. The prior art has considerable advantages, but there are some essential disadvantages: 1) the magnetic field detection device is based on the principle that a superconducting quantum interference device detects a magnetic field, two physical phenomena of magnetic flux quantization and Josephson tunneling effect are used as the detection principle, a low-temperature refrigeration system is needed, liquid nitrogen or liquid helium is generally adopted for refrigeration, and the system structure is complex; 2) the detection sensitivity of the detection device is limited by the detection principle and the complexity of system construction, and the flexibility of the magnetoencephalogram detection is poor; 3) the device has large volume, can not realize miniaturization, has high construction cost, and has limited spatial resolution of the detection magnetic field, thereby influencing the application range.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the not enough of above-mentioned technique, provide a weak magnetic field sensing system based on double-clad hollow photonic crystal optic fibre, this system has simple structure, small, the omnidirectional of post vector light field detects, sensitivity is high, the space multiple spot is measured, need not low temperature refrigerating system, be convenient for realize, detect characteristics such as information volume is big, dynamic pumping, flexibility are good, expansibility is good.
The technical scheme of the utility model is that: a weak magnetic field sensing system based on a double-cladding hollow-core photonic crystal fiber comprises an atomic vapor chamber, a polarization deflector, a circular polarization pump light source, a column vector detection light source, an inner-layer hollow cavity, an inner photoelectric detector array, an outer-layer hollow cavity, an outer photoelectric detector array and a signal analysis processing module; the atomic vapor chamber is a central hollow cavity of the double-cladding hollow-core photonic crystal fiber; an inner photoelectric detector array is arranged in an inner layer hollow cavity of the double-cladding photonic crystal fiber, an outer photoelectric detector array is arranged in an outer layer hollow cavity, and the inner photoelectric detector array and the outer photoelectric detector array are connected with a signal analysis processing module; a polarization deflector, a circular polarization pump light source and a column vector detection light source are arranged outside the end surface of the atomic vapor chamber; the circular polarization pump light source emits pump light beams, the propagation direction of the light beams is changed after the pump light beams pass through the polarization deflector, the light beams enter the cavity of the atomic vapor chamber to be reflected for multiple times, and dynamic atomic vapor pumping is generated; the beam emitted by the column vector detection beam is modulated by a polarization deflector, the composition proportion of radial components and angular components is changed, and the detection beam is incident into the cavity of the atomic vapor chamber 1 and is reflected for multiple times and then partially transmitted out; the transmitted light beams are received by the inner photoelectric detector array and the outer photoelectric detector array to obtain fine spatial distribution information, and the fine spatial distribution information is analyzed by the signal analysis processing module to realize high-spatial-resolution magnetic field detection and sensing.
As to the utility model limit: the atomic vapor chamber is a central hollow cavity of the double-cladding hollow-core photonic crystal fiber and adopts a cylindrical micro-cavity structure with pure silicon dioxide as a background material.
As to the utility model limit: the atom vapor chamber is an alkali metal atom vapor chamber, and the alkali metal atom vapor in the cavity is rubidium atom vapor in alkali metal.
As to the utility model limit: the column vector detection light source is column vector light.
As to the utility model limit: the polarization deflector is a spectrum spectroscope galvanometer, the reflectivity of the emergent light beam of the circular polarization pump light source is 99%, the transmissivity of the emergent detection light beam of the cylindrical vector detection light source is 99%, and the polarization deflector can change the composition proportion of the radial component and the angular component of the cylindrical vector detection light.
As to the utility model limit: the inner photoelectric detector array is positioned in the inner layer hollow cavity, the outer photoelectric detector array is positioned in the outer layer hollow cavity, the inner photoelectric detector array and the outer photoelectric detector array are two-dimensional photoelectric detector arrays, and the two-dimensional photoelectric detector arrays are charge coupled devices or complementary metal oxide semiconductor electric sensors.
As to the utility model limit: the inner hollow cavity and the outer hollow cavity are respectively an inner cladding air hole and an outer cladding air hole of the double-cladding hollow photonic crystal fiber and have strict periodic symmetrical structures, and the six inner hollow cavities and the six outer hollow cavities respectively use the central hollow cavity as a center to form a regular hexagon periodic structure.
As to the utility model limit: a weak magnetic field sensing system based on double-cladding hollow-core photonic crystal fiber comprises the following complete detection process:
the circular polarization pump light source adopts a circular polarization pump light beam as pump light, a polarization deflector is arranged on the emergent light path of the circular polarization pump light beam, the transmission direction of the circular polarization pump light beam is changed after the circular polarization pump light beam passes through the polarization deflector, and after the circular polarization pump light beam is incident from the end face of the atomic vapor chamber, due to the band gap light guiding mechanism of the photonic crystal fiber, the light beam can generate Bragg diffraction in the atomic vapor chamber so as to generate non-total internal reflection, and further reacts with rubidium atomic vapor in the atomic vapor chamber to realize dynamic atomic vapor pumping; the column vector detection light source adopts column vector light as detection light, emergent detection light beams enter from the end face of the atomic vapor chamber, and a light path passes through the polarization deflector before entering the end face of the atomic vapor chamber; on the optical action surface of the polarization deflector, adjusting and recording the composition proportion of the radial component and the angular component of the column vector probe beam; the column vector detection light beam is subjected to multiple reflections after reacting with polarized rubidium atom steam in the cavity of the atom steam chamber, and when passing through the inner wall of the atom steam chamber each time, part of the detection light is transmitted; after the column vector detection light beam after transmission is received by the inner photoelectric detector array positioned in the inner hollow cavity and the outer photoelectric detector array positioned in the outer hollow cavity, the photoelectric distribution information of the detected space difference is transmitted to the signal analysis processing module by the inner photoelectric detector array and the outer photoelectric detector array, and the signal analysis processing module carries out data contrast analysis on the received array signal and the information of the emergent column vector detection light beam recorded on the polarization deflector, so that high-spatial resolution magnetic field detection is realized. Compared with the prior art, the beneficial effects of the utility model are that:
1) the prior art magnetic field detection device is based on the principle that a superconducting quantum interference device detects a magnetic field, two physical phenomena of magnetic flux quantization and Josephson tunneling effect are used as the detection principle, a low-temperature refrigeration system is required, liquid nitrogen or liquid helium is generally adopted for refrigeration, and the system structure is complex. The utility model discloses based on atom magnetic force detection principle and hollow photonic crystal optic fibre band gap leaded light principle, construct atom vapour room, utilize light and atom vapour interact, realize magnetic field detection, do not have superconductive device, have the characteristics that the method is simple and need not low temperature refrigerating system;
2) the prior art device has large volume, can not realize miniaturization, needs to plate a high-reflection film or place a high-reflection micro lens in a reaction cavity to realize multiple reflection of a pumping beam and a detection beam, has complex process, difficult success rate and high construction cost. The utility model discloses a double-cladding hollow photonic crystal fiber, the mechanism of make full use of double-cladding hollow photonic crystal fiber band gap leaded light and receive optics and photoelectricity processing technology a little, realize the multiple reflection of light beam in atomic vapor chamber, the utility model discloses can realize the device miniaturation, avoid the coating difficulty, increase the high step of reflecting these two complicacies of microlens to have the construction with low costs, the modularization degree is high, characteristics such as the function easily expands.
3) The detection sensitivity of the prior art detection device is limited by the detection principle and the complexity of system construction, and the flexibility of the detection aiming at the magnetoencephalogram is poor. The utility model combines circular polarized light pump light source, column vector detecting light source and polarization deflector; the circularly polarized pump light beam emitted by the circularly polarized pump light source passes through the polarization deflector, the propagation direction of the light beam is changed, and the light beam is reflected for multiple times in the cavity after being incident from the end face of the atomic vapor chamber to realize dynamic atomic vapor pumping; the column vector detection light beam emitted by the column vector detection light source can change the composition proportion of the radial component and the angular component in the column vector light through the polarization deflector; the detection light beams are received by the inner photoelectric detector array and the outer photoelectric detector array after being transmitted, and the inner photoelectric detector array and the outer photoelectric detector array transmit signals to the signal analysis processing module for analysis. Therefore the utility model discloses can realize the omnidirectional detection to the post vector light field, and simple structure, be convenient for realize, detect that the information volume is big, dynamic pumping, flexibility are good.
4) The prior art has the defects of large size, complex system construction, single detection point, limited spatial resolution of a detection magnetic field and influence on the application range. The utility model discloses an all-optical atom magnetic force detection mechanism and double-clad hollow photonic crystal optic fibre, six inlayer hollow chamber of make full use of and six outer hollow chamber are the structure of periodic regular array of regular hexagon symmetry, arrange the photoelectric sensor array in the hollow chamber of inlayer and outer hollow chamber, can receive detecting beam at 360 degrees within ranges, thereby realize the utility model discloses this three characteristics are measured to the omnidirectional of space multiple spot measurement, post vector light field and the high spatial resolution in magnetic field to have characteristics such as the flexibility is strong, expansibility is good, the precision is high.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 and 2, a weak magnetic field sensing system based on a double-clad hollow-core photonic crystal fiber includes an atomic vapor chamber 1, a polarization deflector 2, a circular polarization pump light source 3, a column vector detection light source 4, an inner-layer hollow cavity 5, an inner photodetector array 6, an outer-layer hollow cavity 7, an outer photodetector array 8, and a signal analysis processing module 9. The atomic vapor chamber 1 is a central hollow cavity of a double-cladding hollow-core photonic crystal fiber, an inner photoelectric detector array 6 is arranged in an inner hollow cavity 5, an outer photoelectric detector array 8 is arranged in an outer hollow cavity 7, the inner photoelectric detector array 6 and the outer photoelectric detector array 8 are connected with a signal analysis processing module 9, and a polarization deflector 2, a circular polarization pump light source 3 and a column vector detection light source 4 are arranged outside the end face of the atomic vapor chamber 1.
The main principle of the utility model is based on the atom magnetic force detection principle and the band gap light guiding principle of the double-cladding hollow photonic crystal fiber; the circular polarization pump light source 3 emits pump light beams, the pump light beams are reflected by the polarization deflector 2 and then enter the cavity of the atomic vapor chamber 1 to be reflected for multiple times, dynamic atomic vapor pumping is generated, light beams emitted by the column vector detection light beams 4 are modulated by the polarization deflector 2 and then enter the cavity of the atomic vapor chamber 1 to be reflected for multiple times, then the part of the light beams is transmitted, the transmitted light beams are received by the inner photoelectric detector array 6 positioned in the inner-layer hollow cavity 5 and the outer photoelectric detector array 8 positioned in the outer-layer hollow cavity 7 to obtain fine spatial distribution information, and high spatial resolution magnetic field sensing and detection are achieved after analysis is carried out by the signal analysis processing module 9.
The specific implementation process of the embodiment is as follows:
the atomic vapor chamber 1 is characterized in that the atomic vapor chamber is a central hollow cavity of a double-cladding hollow-core photonic crystal fiber, and adopts a cylindrical micro-cavity structure with a background material of pure silicon dioxide; the cavity of the atomic vapor chamber 1 is filled with alkali metal atomic vapor and rubidium atomic vapor in alkali metal is adopted; based on a band gap light guide mechanism of the double-cladding hollow-core photonic crystal fiber, light beams can generate Bragg diffraction in the atomic vapor chamber 1 so as to generate non-total internal reflection in the atomic vapor chamber 1, thereby realizing multiple reflection of the light beams in the atomic vapor chamber 1, and partial light beams can be refracted and transmitted out from the inner wall of the cavity;
the polarization deflector 2 is a spectral beam splitter galvanometer, has high reflection rate of 99% for the emergent light beam of the circular polarization pump light source 3, has high transmittance for the emergent detection light beam of the column vector detection light source and 99% transmittance, and can change the composition proportion of the radial component and the angular component of the column vector detection light beam by the polarization deflector 2;
the circular polarization pump light source 3 adopts a circular polarization pump light beam as pump light, a polarization deflector 2 is arranged on an emergent light path of the circular polarization pump light source 3, the transmission direction of the circular polarization pump light beam is changed after the circular polarization pump light beam passes through the polarization deflector 2, the circular polarization pump light beam is incident from the end face of the atomic vapor chamber 1, multiple reflection occurs in the atomic vapor chamber 1, and the circular polarization pump light beam reacts with rubidium atomic vapor in the atomic vapor chamber 1 to carry out dynamic atomic vapor pumping so as to further expand the information dimension;
the column vector detection light source 4 adopts column vector light as detection light, emergent detection light beams are incident from the end face of the atomic vapor chamber 1, and before the emergent detection light beams are incident on the end face of the atomic vapor chamber 1, light paths pass through the polarization deflector 2; on the optical action surface of the polarization deflector 2, the composition proportion of the radial component and the angular component of the column vector detection beam is adjusted and recorded; the column vector detection light beam is subjected to multiple reflections after reacting with polarized rubidium atom steam in the cavity of the atom steam chamber 1, and when passing through the inner wall of the atom steam chamber each time, part of detection light is transmitted;
the inner photoelectric detector array 6 and the outer photoelectric detector array 8 are both two-dimensional photoelectric detector arrays which are charge coupled devices or complementary metal oxide semiconductor electric sensors; the signal analysis processing module 9 is a super computer; after the transmitted column vector detection light beam is received by the inner photoelectric detector array 6 positioned in the inner hollow cavity 5 and the outer photoelectric detector array 8 positioned in the outer hollow cavity 7, the photoelectric distribution information of the detected space difference is transmitted to the signal analysis processing module 9 by the inner photoelectric detector array 6 and the outer photoelectric detector array 8, and the received array signal and the information of the emergent column vector detection light beam recorded on the polarization deflector 2 are subjected to data contrast analysis by the signal analysis processing module 9, so that high-spatial resolution magnetic field sensing and detection are realized.
The method has the characteristics of simplicity, no need of a low-temperature refrigeration system, simple structure, convenience in implementation, omnidirectional detection of the column vector light field, capability of realizing space multipoint measurement, high spatial resolution of the magnetic field, good expansibility, high sensitivity, large detection information amount, dynamic pumping, good flexibility, miniaturization, wide application range and the like.
The above-mentioned detailed description of the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the most preferred embodiment of the present invention, not used for limiting the present invention, any modification, supplement, equivalent replacement, etc. made within the principle scope of the present invention should be included within the protection scope of the present invention.
The utility model discloses an innovation point lies in band gap leaded light principle and atom magnetic detection principle based on double-clad hollow photonic crystal optic fibre, the problem of coating film difficulty and increase lens has been solved, utilize interior photoelectric detector array and outer photoelectric detector array to obtain meticulous spatial distribution information, realize high spatial resolution magnetic field detection through analytic processing, a method is simple, need not low temperature refrigerating system, moreover, the steam generator is simple in structure, can realize the miniaturation, can realize the detection of post vector light field omnidirectional, high sensitivity, can realize space multiple spot measurement, spatial resolution is high in the magnetic field, good expansibility, it is big to detect the information quantity, the dynamic pumping, the flexibility is good, the weak magnetic field sensing system of being convenient for to realize, avoid the not enough of prior art in essence.
Claims (5)
1. The utility model provides a weak magnetic field sensing system based on double-clad hollow-core photonic crystal fiber, includes atomic vapor room (1), polarization deflector (2), circular polarization pump light source (3), post vector detection light source (4), the empty chamber of inlayer (5), interior photoelectric detector array (6), the empty chamber of skin (7), outer photoelectric detector array (8), signal analysis processing module (9), its characterized in that: the atomic vapor chamber (1) is a central hollow cavity of the double-cladding hollow-core photonic crystal fiber and adopts a cylindrical micro-cavity structure with a background material of pure silicon dioxide; an inner photoelectric detector array (6) is arranged in the inner layer hollow cavity (5), and an outer photoelectric detector array (8) is arranged in the outer layer hollow cavity (7); the inner photoelectric detector array (6) and the outer photoelectric detector array (8) are connected with a signal analysis processing module (9); and a polarization deflector (2), a circular polarization pump light source (3) and a column vector detection light source (4) are arranged outside one side of the atomic vapor chamber (1).
2. The weak magnetic field sensing system based on the double-clad hollow-core photonic crystal fiber as claimed in claim 1, wherein: the atom steam chamber (1) is an alkali metal atom steam chamber, and the alkali metal atom steam in the cavity is rubidium atom steam in alkali metal.
3. The weak magnetic field sensing system based on the double-clad hollow-core photonic crystal fiber as claimed in claim 1, wherein: the polarization deflector (2) is a spectrum spectroscope galvanometer, the reflectivity of the outgoing light beam of the circular polarization pump light source (3) is 99%, and the transmissivity of the outgoing detection light beam of the column vector detection light source (4) is 99%.
4. The weak magnetic field sensing system based on the double-clad hollow-core photonic crystal fiber as claimed in claim 1, wherein: the inner photoelectric detector array (6) is located in the inner hollow cavity (5), the outer photoelectric detector array (8) is located in the outer hollow cavity (7), the inner photoelectric detector array (6) and the outer photoelectric detector array (8) are two-dimensional photoelectric detector arrays, and the two-dimensional photoelectric detector arrays are charge coupled devices or complementary metal oxide semiconductor electric sensors.
5. The weak magnetic field sensing system based on the double-clad hollow-core photonic crystal fiber according to claim 1 or 4, wherein: the inner hollow cavity (5) and the outer hollow cavity (7) are cladding air holes of the double-cladding hollow photonic crystal fiber and have strict periodic symmetrical structures, and the six inner hollow cavities (5) and the six outer hollow cavities (7) are in regular hexagon periodic structures by taking the atomic vapor chamber (1) as the center.
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