CN114527415A - Multichannel full-optical method extremely-weak magnetic field detection device - Google Patents
Multichannel full-optical method extremely-weak magnetic field detection device Download PDFInfo
- Publication number
- CN114527415A CN114527415A CN202210161325.2A CN202210161325A CN114527415A CN 114527415 A CN114527415 A CN 114527415A CN 202210161325 A CN202210161325 A CN 202210161325A CN 114527415 A CN114527415 A CN 114527415A
- Authority
- CN
- China
- Prior art keywords
- plano
- convex lens
- optical
- alkali metal
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
Abstract
The invention discloses a multichannel full-gloss method extremely weak magnetic field detection device, which comprises a laser, a beam expanding collimation system, a beam splitter prism, a spatial light modulator, an optical 4F system, an alkali metal atom gas chamber, a CCD camera and a photoelectric detector array, wherein the beam expanding collimation system, the beam splitter prism, the spatial light modulator, the optical 4F system, the alkali metal atom gas chamber, the CCD camera and the photoelectric detector array are arranged on a light path; when the invention is used as a detection light beam to be applied to an atomic magnetometer system, the multichannel magnetic field measurement of the atomic magnetometer can be realized.
Description
Technical Field
The invention relates to the field of magnetic field detection, in particular to a multi-channel all-optical method extremely-weak magnetic field detection device.
Background
The detection and measurement of magnetic field signals are always important methods for human to know the physical world, and have great significance to human civilization, and in recent years, the detection of weak magnetic signals is widely applied to the fields of space science, biomagnetism, composition and structure analysis of substances and the like. The atomic magnetometer is an optical instrument for detecting polarization change of alkali metal vapor under the action of an external magnetic field, performs magnetic field measurement based on interaction between light and atoms as well as between the atoms and the magnetic field, and becomes a main device for weak magnetic field detection because of ultrahigh magnetic field detection sensitivity. The multi-channel magnetic detection method has important application in different spatial scales, such as geological exploration, biological magnetic field measurement, magnetic microscope and the like.
In the prior art, a detection light path of an atomic magnetometer is mainly a single-channel technical scheme, that is, only one beam of probe light is passed through a single atomic gas chamber, the probe light and atoms interact to generate a signal, and then the signal is received by a corresponding photoelectric sensing device, and the single-channel technical scheme can only measure information of a single point in the atomic gas chamber, which causes low information measurement efficiency. In order to construct a multichannel system for magnetic field distribution detection, one technique is to arrange a plurality of atomic gas cells and a laser, and simultaneously pump and probe a plurality of miniaturized atomic gas cells to acquire multichannel information. But the structural differences affect the uniformity of the sensor. Another way is to divide the pump light in the atomic magnetometer into several segments and then scan the two-dimensional magnetic field distribution.
Disclosure of Invention
The invention aims to solve the problems and provides a multi-channel full-optical method extremely-weak magnetic field detection device which comprises a light source, a beam expanding collimation system, a first beam splitter prism, a spatial light modulator, an optical 4F system, an atomic gas chamber module, a second beam splitter prism and a CCD (charge coupled device) image acquisition module, wherein the beam expanding collimation system, the first beam splitter prism, the spatial light modulator, the optical 4F system, the atomic gas chamber module, the second beam splitter prism and the CCD image acquisition module are arranged through a light path;
the alkali metal atom gas chamber module comprises an alkali metal atom gas chamber; the spatial light modulator is a reflective spatial light modulator;
the CCD image acquisition module comprises a photoelectric detector array and a CCD camera, and the photoelectric detector array and the CCD camera are respectively connected with the optical path of the second beam splitter prism through optical paths;
the light source emits light beams, the light beams enter the spatial light modulator through the first beam splitter prism after passing through the beam expanding and collimating system to realize coded modulation of the light beams and change light field distribution on a space, the light beams after being regulated and controlled are reflected back to the first beam splitter prism and are refracted into the optical 4F system, the light beams after entering the optical 4F system enter the alkali metal atom air chamber and carry a light spot pattern in the alkali metal atom air chamber to be divided into two light beams through the second beam splitter prism, the two light beams respectively enter the photoelectric detector array and the CCD camera, the CCD camera converts optical images into digital signals, and polarization distribution of the light spots is measured; the photoelectric detector array converts the optical signal into an electric signal, measures the intensity of an optical field, and calculates the intensity of the magnetic field.
Further, the alkali metal atom gas chamber is provided with a heating element for heating the alkali metal atom gas chamber;
when the extremely weak magnetic field detection device is applied to an atomic magnetometer system as a probe beam, the heating element heats the alkali metal atom air chamber, the alkali metal atoms in the alkali metal atom air chamber are polarized, the alkali metal atoms with different volumes become independent local magnetic sensors, and the probe beam is modulated by the reflective spatial light modulator to realize multichannel weak magnetic measurement of magnetic field distribution.
Further, the light source is a laser, and the wavelength of laser light emitted by the laser is 780 nm.
Furthermore, the beam expanding and collimating system comprises a first plano-convex lens and a second plano-convex lens which are sequentially arranged on a light path, the focuses of the first plano-convex lens and the second plano-convex lens are different, and the light beam passes through the first plano-convex lens and the second plano-convex lens to realize beam expanding and collimating.
Further, optics 4F system is including the third plano-convex lens, the fourth plano-convex lens, the fifth plano-convex lens and the sixth plano-convex lens that light path set up in proper order, the focal length of third plano-convex lens, fourth plano-convex lens, fifth plano-convex lens and sixth plano-convex lens is the same, alkali metal atom air chamber set up in the fifth plano-convex lens with between the sixth plano-convex lens.
Furthermore, an aperture diaphragm used for filtering the light beam is further arranged in the optical 4F system, and the aperture diaphragm is arranged between the third plano-convex lens and the fourth plano-convex lens.
Compared with the prior art, the invention has the following beneficial effects: the vector light field regulation and control is combined with the alkali metal atom gas chamber, when the multi-channel all-optical method extremely-weak magnetic field detection device is applied to an atom magnetometer system, the multi-channel magnetic field measurement of the atom magnetometer can be realized, and multi-channel magnetic field information can be obtained simultaneously through calculation and processing, so that the aim of improving the sensitivity of the atom magnetometer is fulfilled; the measuring device has the advantages of simple structure, high detection precision, strong anti-interference capability, high reliability, wide application range and expandable functions, and is a multi-channel optical detection method for weak magnetic measurement.
Drawings
FIG. 1 is a structural diagram of a multi-channel full-optical method extremely-weak magnetic field detection device of the invention;
FIG. 2 is a schematic diagram of an atomic magnetometer.
In the figure, 1, a laser; 2. a first plano-convex lens; 3. a second plano-convex lens; 4. a first beam splitting prism; 5. a spatial light modulator; 6. a third plano-convex lens; 7. a small aperture diaphragm; 8. a fourth plano-convex lens; 9. a fifth plano-convex lens; 10. an alkali metal atom gas cell; 11. a sixth plano-convex lens; 12. a second beam splitting prism; 13. a CCD camera; 14. an array of photodetectors; 15. a heating member; 16. a magnetic compensation coil; 17. a magnetic shielding device; 18. detecting a light beam; 19. a pump beam.
Detailed Description
A multi-channel plenoptic infield magnetic field detection apparatus according to the present invention will now be described in more detail with reference to the schematic drawings, in which preferred embodiments of the invention are shown, it being understood that a person skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention, and that the following description is therefore to be construed as broadly as possible for a person skilled in the art and not as limiting the invention.
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.
As shown in fig. 1, a multi-channel full-optical method extremely-weak magnetic field detection device includes a light source, and a beam expanding collimation system, a beam splitter prism, a spatial light modulator 5, an optical 4F system, an atomic gas chamber module, and a CCD image acquisition module, which are arranged on a light path.
The light source is a laser 1, and the wavelength of a light beam emitted by the laser 1 is 780 nm; the beam expanding and collimating system comprises a first plano-convex lens 2 and a second plano-convex lens 3, and the focal lengths of the first plano-convex lens 2 and the second plano-convex lens 3 are different; the beam splitting prism comprises a first beam splitting prism 4 and a second beam splitting prism 12 and is used for splitting the light beam; the spatial light modulator 5 is a reflective spatial light modulator and is used for vector regulation and control of light beams; the optical 4F system includes a third plano-convex lens 6, a fourth plano-convex lens 8, a fifth plano-convex lens 9 and a sixth plano-convex lens 11, focal lengths of the third plano-convex lens 6, the fourth plano-convex lens 8, the fifth plano-convex lens 9 and the sixth plano-convex lens 11 are the same, and it should be noted that a small aperture diaphragm 7 is further disposed on a light path between the third plano-convex lens 6 and the fourth plano-convex lens 8 for filtering; the atomic gas chamber module comprises an alkali metal atom gas chamber 10 and a heating element 15 for the alkali metal atom gas chamber, when needed, the alkali metal atom gas chamber 10 is heated, so that alkali metal atoms in the alkali metal atom gas chamber 10 are polarized, the alkali metal atoms are slowly diffused under high pressure and limited in a small area of the gas chamber during a single coherent life, and the alkali metal atoms with different volumes in the alkali metal atom gas chamber 10 become independent local magnetic sensors when a magnetic field gradient returns; the CCD image acquisition module comprises a CCD camera 13 and a photoelectric detector array 14, the CCD camera 13 is used for acquiring light spot polarization distribution, and the photoelectric detector array 14 is used for receiving signals generated by interaction of light beams and atoms so as to obtain detected magnetic field information.
The technical principle of the invention is as follows: the laser 1 emits a laser beam with the wavelength of 780nm, and the beam is expanded and collimated through the first plano-convex lens 2 and the second plano-convex lens 3 in sequence to output parallel light. Parallel light beams subjected to beam expanding and collimating pass through the first beam splitter prism 4 and enter the reflective spatial light modulator for vector regulation under the condition that the polarization state of the light beams is not changed, and the reflective spatial light modulator can perform coding modulation on the parallel light beams and change the spatial light field distribution. Parallel light beams carry special wavefront information to be reflected back to the first light splitting prism 4 after passing through the reflective spatial light modulator and are refracted into the third plano-convex lens 6, the light beams are focused through the third plano-convex lens 6 and then are spatially filtered through the small-hole diaphragm 7 to filter stray light, the filtered light beams are changed into parallel light through the fourth plano-convex lens 8, the parallel light beams are focused on the alkali metal atom air chamber 10 through the fifth plano-convex lens 9, and the light beams passing through the alkali metal atom air chamber 10 are expanded through the sixth plano-convex lens 11 and enter the second light splitting prism 12. The alkali metal atom air chamber 10 is placed at the intersection point of the fifth plano-convex lens 9 and the sixth plano-convex lens 11, so that the highest modulation efficiency can be obtained, information is not easy to lose, and the speckle patterns of a plurality of different positions in the alkali metal atom air chamber 10 can be obtained simultaneously. The optical 4F system composed of the third planoconvex lens 6, the fourth planoconvex lens 8, the fifth planoconvex lens 9, and the sixth planoconvex lens 11 is a linear optical processing system, and the optical lens converts different optical images into different spatial frequency spectrums, and the spatial frequency spectrums of the respective portions can be received by a photoelectric detection element for analysis, or the spatial frequency spectrums of the input signals can be subjected to various processing by using the spatial light modulator 5.
The light beam entering the second beam splitter prism 12 is divided into two light beams, wherein one light beam enters the CCD camera 13, the CCD camera 13 converts the optical image into a digital signal, and the polarization distribution of the light spot is measured; another light beam enters the photodetector array 14, and the photodetector array 14 converts the optical signal into an electrical signal to measure the intensity of the optical field, thereby calculating the intensity of the magnetic field.
The staff of measurement need place each component in suitable position according to the device structure, opens the back of laser instrument 1 switch, adjusts the light path to its unobstructed, changes the phase place through reflective spatial light modulator and modulates the light beam, uses CCD camera 13 to gather light path information, can use the heating member to heat the light field information under with the collection multiple temperature to alkali metal atom air chamber 10 during. The effect between the light and the atoms can be further observed.
The present invention can be applied to an atomic magnetometer system as shown in fig. 2 as a probe beam 18, and when the present invention is applied to an atomic magnetometer system, a magnetic compensation coil 16 is provided outside the heating member 15, and the magnetic compensation coil 16 further compensates for residual magnetism, so as to ensure that the inside is in a nonmagnetic environment. The heating element 15 heats the alkali metal atom gas chamber 10, so that the alkali metal atoms with different volumes in the alkali metal atom gas chamber 10 become independent local magnetic sensors. At this time, the pump beam 19 pumps the alkali metal atoms, and the reflective spatial light modulator modulates the probe beam 18 to probe the alkali metal atom gas cell 10, so that multi-channel weak magnetic measurement of magnetic field distribution can be realized.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A multi-channel full-optical method extremely-weak magnetic field detection device is characterized by comprising a light source, a beam expanding collimation system, a first beam splitter prism (4), a spatial light modulator (5), an optical 4F system, an atomic gas chamber module, a second beam splitter prism (12) and a CCD image acquisition module, wherein the beam expanding collimation system, the first beam splitter prism (4), the spatial light modulator, the optical 4F system, the atomic gas chamber module, the second beam splitter prism (12) and the CCD image acquisition module are arranged through a light path;
the alkali metal atom gas chamber module comprises an alkali metal atom gas chamber (10); the spatial light modulator (5) is a reflective spatial light modulator;
the CCD image acquisition module comprises a photoelectric detector array (14) and a CCD camera (13), and the photoelectric detector array (14) and the CCD camera (13) are respectively connected with the light path of the second beam splitter prism (12);
the light source emits light beams, the light beams enter the spatial light modulator (5) through the first light splitting prism (4) after passing through the beam expanding and collimating system to realize coded modulation of the light beams and change the spatial light field distribution, the light beams after being regulated and controlled are reflected back to the first light splitting prism (4) and are refracted into the optical 4F system, the light beams after entering the optical 4F system pass through the alkali metal atom gas chamber (10) and carry a light spot pattern in the alkali metal atom gas chamber (10) to be divided into two light beams through the second light splitting prism (12), the two light beams respectively enter the photoelectric detector array (14) and the CCD camera (13), the CCD camera (13) converts an optical image into a digital signal, and the polarization distribution of the light spots is measured; the photoelectric detector array (14) converts the optical signals into electric signals, measures the intensity of the optical field and calculates the intensity of the magnetic field.
2. The extremely weak magnetic field detecting apparatus according to claim 1, characterized in that the alkali metal atom gas chamber (10) is provided with a heating member (15) for heating the alkali metal atom gas chamber (10);
when the extremely weak magnetic field detection device is applied to an atomic magnetometer system as a probe beam, the heating member (15) heats the alkali metal atom air chamber (10), the alkali metal atoms in the alkali metal atom air chamber (10) are polarized, and the alkali metal atoms with different volumes become independent local magnetic sensors, and the probe beam is modulated by the reflective spatial light modulator, so that the multichannel weak magnetic measurement of magnetic field distribution is realized.
3. The multi-channel all-optical ultra-weak magnetic field detection device according to claim 2, wherein the light source is a laser (1), and the wavelength of laser light emitted by the laser (1) is 780 nm.
4. The device for detecting the ultra-weak magnetic field according to claim 3, wherein the beam expanding and collimating system comprises a first plano-convex lens (2) and a second plano-convex lens (3) which are sequentially arranged in an optical path, the focuses of the first plano-convex lens (2) and the second plano-convex lens (3) are different, and the beam expanding and collimating are realized through the first plano-convex lens (2) and the second plano-convex lens (3).
5. The multi-channel full-gloss method extremely weak magnetic field detection device according to claim 4, wherein the optical 4F system comprises a third plano-convex lens (6), a fourth plano-convex lens (8), a fifth plano-convex lens (9) and a sixth plano-convex lens (11) which are arranged in sequence in an optical path, the focal lengths of the third plano-convex lens (6), the fourth plano-convex lens (8), the fifth plano-convex lens (9) and the sixth plano-convex lens (11) are the same, and the alkali metal atom gas chamber (10) is arranged between the fifth plano-convex lens (9) and the sixth plano-convex lens (11).
6. A multi-channel all-optical extremely weak magnetic field detection device according to claim 5, characterized in that an aperture stop (7) is further disposed in the optical 4F system for filtering the light beam, and the aperture stop (7) is disposed between the third plano-convex lens (6) and the fourth plano-convex lens (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210161325.2A CN114527415A (en) | 2022-02-22 | 2022-02-22 | Multichannel full-optical method extremely-weak magnetic field detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210161325.2A CN114527415A (en) | 2022-02-22 | 2022-02-22 | Multichannel full-optical method extremely-weak magnetic field detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114527415A true CN114527415A (en) | 2022-05-24 |
Family
ID=81624196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210161325.2A Withdrawn CN114527415A (en) | 2022-02-22 | 2022-02-22 | Multichannel full-optical method extremely-weak magnetic field detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114527415A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115754845A (en) * | 2022-12-07 | 2023-03-07 | 之江实验室 | Atomic magnetometer spatial magnetic field imaging device and method based on vector light modulation |
-
2022
- 2022-02-22 CN CN202210161325.2A patent/CN114527415A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115754845A (en) * | 2022-12-07 | 2023-03-07 | 之江实验室 | Atomic magnetometer spatial magnetic field imaging device and method based on vector light modulation |
| CN115754845B (en) * | 2022-12-07 | 2023-09-01 | 之江实验室 | Atomic magnetometer space magnetic field imaging device and method based on vector light modulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20200341081A1 (en) | Compact optically pumped magnetometers with pump and probe configuration and systems and methods | |
| CN112683332B (en) | Multi-physical-parameter wide-field quantum camera based on ensemble nitrogen atom-vacancy color center | |
| Weber et al. | A high sensitivity two-color interferometer for pulsed power plasmas | |
| CN111983526B (en) | Atomic magnetometer and magnetic field imaging system | |
| US10228287B2 (en) | Measuring polarisation via a gating frequency | |
| US8472026B2 (en) | Compact surface plasmon resonance apparatus and method | |
| CN101441253A (en) | High-sensitivity atomic magnetometer | |
| CN201589659U (en) | Optical structure of simultaneous polarization imaging detection system | |
| CN109856058B (en) | High-resolution real-time polarization spectrum analysis device and method | |
| CN111220934A (en) | Gradient detection system based on pulse pumping magnetometer | |
| CN102768184A (en) | System for Young modulus measurement of film | |
| CN114527415A (en) | Multichannel full-optical method extremely-weak magnetic field detection device | |
| CN103528991A (en) | System and method for measuring organic matter content of soil | |
| CN103940341A (en) | Displacement and inclination angle integrated test instrument | |
| CN110686853A (en) | Focusing laser differential interferometer and non-intrusive method for measuring density pulsation of flow field of wind tunnel | |
| CN113740786A (en) | Method for measuring alkali metal atom density of single-beam SERF atomic magnetometer | |
| CN112415444B (en) | Atomic magnetometer detection light path system based on quantum weak measurement | |
| CN107422287B (en) | A kind of virtualization biscuit porcelain resonance signal synchronization motivationtheory and detection method and device | |
| CN108051090A (en) | The polarization parameter detecting system of helical polarization light field | |
| CN117007187A (en) | Broad spectrum microscopic Raman ghost imaging device and imaging method based on structured light illumination | |
| CN106707202B (en) | High spatial resolution detector for magnetic field and method | |
| CN106404695B (en) | Spectrophotometer | |
| CN115727936A (en) | Magnetic Johnson noise testing device based on atomic sensing | |
| CN113899728A (en) | Dual-wavelength light source Raman spectrometer system | |
| CN104237169A (en) | Detection method of SPR detection system based on external field modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220524 |