CN206381174U - Magnetic induction image device based on laser atom magnetometer - Google Patents
Magnetic induction image device based on laser atom magnetometer Download PDFInfo
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- CN206381174U CN206381174U CN201621116441.9U CN201621116441U CN206381174U CN 206381174 U CN206381174 U CN 206381174U CN 201621116441 U CN201621116441 U CN 201621116441U CN 206381174 U CN206381174 U CN 206381174U
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Abstract
The utility model discloses a kind of magnetic induction image device based on laser atom magnetometer, including signal acquisition process device, the excitation coil for producing excitation field, the supporting plate for support testee and the detector for detecting electromagnetic field；The detector includes LASER Light Source, the first half-wave plate, the first polarization splitting prism, the first speculum, quarter-wave plate, the second speculum, the second half-wave plate, atomic air chamber, search coil, dc source, the second polarization splitting prism, the 3rd speculum, balanced photodiodes receiver, amplification circuit module, lock-in amplifier and radio-frequency power supply module；The utility model employs the detector of laser atom magnetometer structure, electromagnetic field is measured using the interaction between atomic magnetic moment and external magnetic field, with higher detectivity, the faint electromagnetic field of biological tissue's generation can be accurately measured, is conducive to popularization and application of the magnetic induction image in medical imaging diagnosis.
Description
Technical field
The utility model is related to a kind of magnetic induction image device, more particularly to a kind of magnetic strength based on laser atom magnetometer
Answer imaging device.
Background technology
The application of X-ray medically establishes vivisection and the new ideas of physiology, promote preclinical medicine and
It is clinical medical to flourish.Particularly most between recent 20 years, with the development of high-speed computer, by radiation technique, ultrasonic wave,
Electromagnetic technique is combined with Computing, is generated a series of high-precision including CT, ultrasonic imaging, magnetic resonance imaging etc.
Degree, high-resolution medical imaging diagnosis equipment.
Although current detection technique such as head CT, nuclear magnetic resonance (MRI) and the Diffusion MR Images (DWI) etc., can with
It is accurate to judge property, scope and the degree of critical illness, but continuous imaging by bed still can not be carried out, endangered for the state of an illness
Weight, change are very fast, but the patient that should not be moved repeatedly can not monitor the dynamic change of its focus, thus to Disease evolution and
When judge and adjustment therapeutic scheme be restricted.So urgent need is a kind of portable, the medical science shadow of on-line monitor can be carried out to patient
As diagnostic device, the particularly important is can effectively detect the situation of encephaledema hemotoncus.
Magnetic induction image (Magnetic Induction Tomography, MIT) is a kind of new imaging technique, its
General principle is to utilize to produce main field B by the excitation coil of sinusoidal current, testee is placed in main field B, quilt
Survey interior of articles and induce eddy current, the secondary magnetic field Δ B that eddy current is produced will cause Distribution of Magnetic Field in space to become
Change, B+ Δ B are detected in detection coil, when the electrical conductivity of object changes, the eddy current distribution of interior of articles will be with
Change so that the voltage of detection coil also changes, thus detection coil voltage change exist with distribution of conductivity it is close
The relation cut, can realize that the image being distributed to testee internal conductance rate is shown using restructing algorithm.MIT and traditional doctor
Learn imaging technique different, MIT uses the physiology and pathology shape that this brand-new physical quantity of electrical impedance reflects for medium in human body
State.
MIT has a significant advantage of following four, time sensitivity, easily penetrate skull, it is noninvasive and safe, portable and just.
Therefore, it is possible to effectively solve the early screening and dynamic monitor of clinically cranial vascular disease in clinic using MIT Technology applications
The problem of early warning, lifts treatment level, is preferably people's health service.But be due to biological tissue electrical conductivity it is very small,
Generally in below 10s/m, biological tissue is in the presence of main field, and the secondary magnetic field of generation is very faint, and existing magnetic strength
Imaging device is answered to be difficult to accurately measure this faint electromagnetic field, so as to limit magnetic induction image in medical imaging diagnosis
Popularization and application.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of magnetic induction image dress based on laser atom magnetometer
Put, can accurately measure the faint electromagnetic field of biological tissue's generation, be conducive to magnetic induction image in medical imaging diagnosis
Popularization and application.
Magnetic induction image device of the present utility model based on laser atom magnetometer, including signal acquisition process device, use
In the excitation coil, the supporting plate for support testee and the detector for detecting electromagnetic field that produce excitation field；
The detector include LASER Light Source, the first half-wave plate, the first polarization splitting prism, the first speculum, four/
One wave plate, the second speculum, the second half-wave plate, atomic air chamber, search coil, dc source, the second polarization splitting prism, the 3rd
Speculum, balanced photodiodes receiver, amplification circuit module, lock-in amplifier and radio-frequency power supply module；
The laser that the LASER Light Source is launched mutually is hung down by being divided into after the first half-wave plate by the first polarization splitting prism
Straight pump light and detection light, irradiated atoms gas is injected after the reflection that pump light passes through the first speculum by quarter-wave plate
Room, atomic air chamber is injected after the reflection that detection light passes through the second speculum by the second half-wave plate；The inspection projected from atomic air chamber
Light-metering is divided into perpendicular two-beam by the second polarization splitting prism, and wherein light beam is arrived after the reflection of the 3rd speculum
Up to the first signal input part of balanced photodiodes receiver, another light beam directly reaches balanced photodiodes receiver
Secondary signal input；The dc source provides DC current for search coil, and the search coil provides static state for air chamber
Magnetic field；
The optical signal of input is converted into electric signal by the balanced photodiodes receiver, and electric signal passes through amplifying circuit
The test side of lock-in amplifier is sent into after the amplification of module；The radio-frequency power supply module provides AC signal to lock-in amplifier
Reference signal end is to provide reference frequency, while the electric current driving excitation coil that radio-frequency power supply module provides alternation produces excitation magnetic
, excitation field induces vortex field in testee；The amplitude and phase signal of the lock-in amplifier are inputted to letter
Number Acquisition Processor is handled.
Further, the search coil is Helmholtz coil.
Further, the detector also includes a temperature control system for being used to control temperature in atomic air chamber, the temperature
Degree control system includes temperature controller, the temperature sensor being located in atomic air chamber and is respectively provided at atomic air chamber upper and lower ends
Heating plate, the signal input part of the temperature controller is connected with the signal output part of temperature sensor, the temperature control
The signal output part of device is connected with the signal input part of heating plate.
Further, the LASER Light Source is handled by laser frequency stabilization and carries out Frequency Locking.
Further, filling rubidium atomic gas inside the atomic air chamber.
Further, the supporting plate is moved in three dimensions by 3 D scanning system driving, and signal acquisition process device is to three
Dimension scanning system sends control signal；The signal acquisition process device is according to the locus signal of 3 D scanning system and lock phase
The amplitude and phase signal of amplifier carry out Image Reconstruction.
The beneficial effects of the utility model：Magnetic induction image device of the present utility model based on laser atom magnetometer,
The detector of laser atom magnetometer structure is employed, using the interaction between atomic magnetic moment and external magnetic field to electromagnetic field
Measure, with higher detectivity, can accurately measure the faint electromagnetic field of biological tissue's generation, be conducive to
Popularization and application of the magnetic induction image in medical imaging diagnosis.
Brief description of the drawings
The utility model is further described with reference to the accompanying drawings and examples：
Fig. 1 is structural representation of the present utility model.
Embodiment
Fig. 1 is structural representation of the present utility model, as shown in the figure：The magnetic based on laser atom magnetometer of the present embodiment
Induction image forming device, including signal acquisition process device 1, the excitation coil 2 for producing excitation field, for support testee
4 supporting plate 3 and the detector for detecting electromagnetic field；Signal acquisition process device 1 can be with data processing and signal control
Single-chip microcomputer；Testee 4 is placed on supporting plate 3, and is moved with the movement of supporting plate 3, and excitation coil 2 produces main field, will be by
Survey object 4 to be placed in main field, eddy current is induced inside testee 4, the secondary magnetic field that eddy current is produced will cause
Distribution of Magnetic Field changes in space；The detector include LASER Light Source 5, the first half-wave plate 6, the first polarization splitting prism 7,
It is first speculum 8, quarter-wave plate 9, the second speculum 10, the second half-wave plate 11, atomic air chamber 12, search coil 13, straight
Flow power supply 14, the second polarization splitting prism 15, the 3rd speculum 16, balanced photodiodes receiver 17, amplification circuit module
18th, lock-in amplifier 19 and radio-frequency power supply module 20；LASER Light Source 5 is handled by laser frequency stabilization and carries out Frequency Locking, for example may be used
Frequency Locking is carried out using dichroism atomic vapour laser steady frequency technology；The inside of atomic air chamber 12 can fill rubidium atomic gas.
The laser that the LASER Light Source 5 is launched by the first polarization splitting prism 7 after the first half-wave plate 6 by being divided into phase
Vertical pump light and detection light, irradiation original is injected after the reflection that pump light passes through the first speculum 8 by quarter-wave plate 9
Sub- air chamber 12, atomic air chamber 12 is injected after the reflection that detection light passes through the second speculum 10 by the second half-wave plate 11；From atom
The detection light that air chamber 12 is projected is divided into perpendicular two-beam by the second polarization splitting prism 15, and wherein light beam passes through the 3rd
The first signal input part of balanced photodiodes receiver 17 is reached after the reflection of speculum 16, another light beam directly reaches flat
The secondary signal input for the photodiode receiver 17 that weighs；The dc source 14 provides direct current for Helmholtz coil
Stream, the search coil 13 provides static magnetic field for air chamber；Search coil 13 is preferably Helmholtz coil, can improve magnetic field strong
Degree and the uniformity.
The optical signal of input is converted into electric signal by the balanced photodiodes receiver 17, and electric signal is by amplification electricity
The test side of lock-in amplifier 19 is sent into after the amplification of road module 18；The radio-frequency power supply module 20 provides AC signal to lock phase
The reference signal end of amplifier 19 is to provide reference frequency, while radio-frequency power supply module 20 provides the electric current driving excitation line of alternation
Circle 2 produces excitation field, and excitation field induces vortex field in testee 4；The amplitude and phase of the lock-in amplifier 19
Position signal, which is inputted to signal acquisition process device 1, to be handled；Balanced photodiodes receiver 17 be one kind overcome fluctuation and
The balance receiver of noise, can eliminate the almost all of noise from spectrum analysis, for example, can use sacher-laser
The balanced photodiodes receiver of brand.
In the present embodiment, the detector also includes a temperature control system for being used to control temperature in atomic air chamber 12,
The temperature control system includes temperature controller 21, the temperature sensor being located in atomic air chamber 12 and is respectively provided at atom gas
The heating plate 22 of the upper and lower ends of room 12, the signal input part of the temperature controller 21 and the signal output part phase of temperature sensor
Even, the signal output part of the temperature controller is connected with the signal input part of heating plate 22.
In the present embodiment, the supporting plate 3 is driven by 3 D scanning system 23 to be moved in three dimensions, signal acquisition process
Device 1 sends control signal to 3 D scanning system 23；3 D scanning system 23 may include some guide rails and motor, can make
Supporting plate 3 is moved in the three dimensions that X is constituted to, Y-direction and Z-direction；The signal acquisition process device 1 is according to 3 D scanning system 23
Locus signal and lock-in amplifier 19 amplitude and phase signal carry out Image Reconstruction.
The workflow of the present apparatus includes three phases：Warm-up phase, initial phase and formal measuring phases.Preheat rank
Section works radio-frequency power supply module 20, and the heating of excitation coil 2 tends to balance, and makes excitation field stable；By Helmholtz coil
Power module works, and coil heating tends to balance, and makes static field stable magnetic field；Temperature control system is heated, and makes the temperature of air chamber
It is stable.The warm operation of LASER Light Source 5, Frequency Locking.By adjusting 3 D scanning system 23, coordinate returns to origin, often moves one
Individual coordinate points, one group of amplitude of test and phase data, until the end of scan, computer picture reconstruct.
The magnetic induction image device based on laser atom magnetometer of the present embodiment, employs laser atom magnetometer structure
Detector, electromagnetic field is measured using the interaction between atomic magnetic moment and external magnetic field, with higher detection
Sensitivity, can accurately measure the faint electromagnetic field of biological tissue's generation, be conducive to magnetic induction image to be examined in medical image
Popularization and application in disconnected.
Finally illustrate, above example is only unrestricted to illustrate the technical solution of the utility model, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those within the art that, can be to this
The technical scheme of utility model is modified or equivalent substitution, without departing from the objective and model of technical solutions of the utility model
Enclose, it all should cover among right of the present utility model.
Claims (6)
1. a kind of magnetic induction image device based on laser atom magnetometer, including signal acquisition process device, for producing excitation
The excitation coil in magnetic field, the supporting plate for support testee and the detector for detecting electromagnetic field；It is characterized in that：
The detector includes LASER Light Source, the first half-wave plate, the first polarization splitting prism, the first speculum, quarter-wave
Piece, the second speculum, the second half-wave plate, atomic air chamber, search coil, dc source, the second polarization splitting prism, the 3rd reflection
Mirror, balanced photodiodes receiver, amplification circuit module, lock-in amplifier and radio-frequency power supply module；
The laser that the LASER Light Source is launched by the first polarization splitting prism after the first half-wave plate by being divided into perpendicular
Pump light and detection light, irradiated atoms air chamber is injected after the reflection that pump light passes through the first speculum by quarter-wave plate,
Atomic air chamber is injected by the second half-wave plate after the reflection that detection light passes through the second speculum；The detection light projected from atomic air chamber
It is divided into perpendicular two-beam by the second polarization splitting prism, wherein light beam reaches flat after the reflection of the 3rd speculum
First signal input part of the photodiode receiver that weighs, another light beam directly reaches the second of balanced photodiodes receiver
Signal input part；The dc source provides DC current for search coil, and the search coil provides static magnetic field for air chamber；
The optical signal of input is converted into electric signal by the balanced photodiodes receiver, and electric signal passes through amplification circuit module
Amplification after send into lock-in amplifier test side；The radio-frequency power supply module provides reference of the AC signal to lock-in amplifier
Signal end is to provide reference frequency, while the electric current driving excitation coil that radio-frequency power supply module provides alternation produces excitation field,
Excitation field induces vortex field in testee；The amplitude and phase signal of the lock-in amplifier, which are inputted to signal, adopts
Set processor is handled.
2. the magnetic induction image device according to claim 1 based on laser atom magnetometer, it is characterised in that：It is described to visit
Test coil is Helmholtz coil.
3. the magnetic induction image device according to claim 1 based on laser atom magnetometer, it is characterised in that：It is described to visit
Surveying device also includes a temperature control system for being used to control temperature in atomic air chamber, and the temperature control system includes temperature control
Device, the temperature sensor being located in atomic air chamber and the heating plate for being respectively provided at atomic air chamber upper and lower ends, the temperature control
The signal input part of device is connected with the signal output part of temperature sensor, the signal output part and heating plate of the temperature controller
Signal input part be connected.
4. the magnetic induction image device according to claim 1 based on laser atom magnetometer, it is characterised in that：It is described to swash
Radiant is handled by laser frequency stabilization and carries out Frequency Locking.
5. the magnetic induction image device according to claim 1 based on laser atom magnetometer, it is characterised in that：The original
Sub- plenum interior fills rubidium atomic gas.
6. the magnetic induction image device according to claim 1 based on laser atom magnetometer, it is characterised in that：The support
Plate is moved in three dimensions by 3 D scanning system driving, and signal acquisition process device sends control letter to 3 D scanning system
Number；The signal acquisition process device is believed according to the locus signal of 3 D scanning system and the amplitude and phase of lock-in amplifier
Number carry out Image Reconstruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621116441.9U CN206381174U (en) | 2016-10-12 | 2016-10-12 | Magnetic induction image device based on laser atom magnetometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621116441.9U CN206381174U (en) | 2016-10-12 | 2016-10-12 | Magnetic induction image device based on laser atom magnetometer |
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| Publication Number | Publication Date |
|---|---|
| CN206381174U true CN206381174U (en) | 2017-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621116441.9U Expired - Fee Related CN206381174U (en) | 2016-10-12 | 2016-10-12 | Magnetic induction image device based on laser atom magnetometer |
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| CN (1) | CN206381174U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541500A (en) * | 2018-12-07 | 2019-03-29 | 中国人民解放军国防科技大学 | Co-magnetometer based on alkali metal atom hyperfine energy level Zeeman splitting |
| CN109753095A (en) * | 2017-11-03 | 2019-05-14 | 北京自动化控制设备研究所 | A kind of atomic air chamber based on multi-point joint observing and controlling is without magnetic temperature control system |
| CN113189528A (en) * | 2021-06-30 | 2021-07-30 | 季华实验室 | Reading method, device, equipment and medium applied to miniaturized atomic magnetometer |
-
2016
- 2016-10-12 CN CN201621116441.9U patent/CN206381174U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109753095A (en) * | 2017-11-03 | 2019-05-14 | 北京自动化控制设备研究所 | A kind of atomic air chamber based on multi-point joint observing and controlling is without magnetic temperature control system |
| CN109541500A (en) * | 2018-12-07 | 2019-03-29 | 中国人民解放军国防科技大学 | Co-magnetometer based on alkali metal atom hyperfine energy level Zeeman splitting |
| CN109541500B (en) * | 2018-12-07 | 2021-08-13 | 中国人民解放军国防科技大学 | Co-magnetometer based on alkali metal atom hyperfine energy level Zeeman splitting |
| CN113189528A (en) * | 2021-06-30 | 2021-07-30 | 季华实验室 | Reading method, device, equipment and medium applied to miniaturized atomic magnetometer |
| CN113189528B (en) * | 2021-06-30 | 2021-09-21 | 季华实验室 | Reading method, device, equipment and medium applied to miniaturized atomic magnetometer |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170808 Termination date: 20211012 |
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| CF01 | Termination of patent right due to non-payment of annual fee |