CN208488536U - A kind of multichannel optical pumping atomic magnetic force sensing device - Google Patents
A kind of multichannel optical pumping atomic magnetic force sensing device Download PDFInfo
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- CN208488536U CN208488536U CN201820879545.8U CN201820879545U CN208488536U CN 208488536 U CN208488536 U CN 208488536U CN 201820879545 U CN201820879545 U CN 201820879545U CN 208488536 U CN208488536 U CN 208488536U
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Abstract
The utility model discloses a kind of multichannel optical pumping atomic magnetic force sensing devices, including at least one light splitting polarization-maintaining Transmission system；Multiplexed detection light, detection light include through polarised light obtained by a light splitting polarization-maintaining Transmission system light splitting；It is connected with light splitting polarization-maintaining Transmission system and receives the atomic magnetic force sensing module of detection light, light splitting polarization-maintaining Transmission system, including depolarization module, spectral module and be polarized module, depolarization module is connected with spectral module and is arranged in front of being polarized module.It the advantage is that, by the way that laser is carried out depolarization recurrence processing partially or first depolarization light splitting afterwards recurrence processing partially after being first divided, laser is divided into required multi-path laser；It using the pump probe function of detection light, polarizes to atom, so that atom generates a biggish macroscopic moment, meets multiplexed detection light and share the condition that an atomic air chamber carries out multiple spot information measurement, improve the efficiency of information measurement.
Description
Technical field
The utility model relates to atom magnetometer field more particularly to a kind of multichannel optical pumping atomic magnetic force sensing devices.
Background technique
Magnetic Field is present in many occasions, can obtain many unknown messages using Magnetic Field, raw in ground magnetic detection
Object magnetic field detection etc. has many applications.Classical magnetic field measuring instrument has fluxgate, the devices such as gaussmeter.As quantum is surveyed
, there is the atom magnetometer based on quantum effect in the mature development of amount technology, mainly there is an optical pumped magnetometer, proton magnetometer,
Without spin-exchange relaxation magnetometer and pumping pulse formula magnetometer.Atom magnetometer is with higher sensitivity and accurately
Degree, is the mainstream development direction of current magnetic field measuring instrument.
But existing atom magnetometer is mostly single channel technical solution, i.e., only by visiting all the way in single atomic air chamber
Light is surveyed, detection light and atomic interaction generate signal, then receive Magnetic Field by corresponding photoelectric sensor.Single-pass
Road technical solution can only measure the information of single-point in atomic air chamber, cause the measurement efficiency of information lower.
Realize that the Major Difficulties of multichannel optical pumping atomic magnetic force sensing device are: 1, existing for single atomic air chamber
Multichannel technology existing defects, the diffusion length that the spacing distance of adjacent different detection light is greater than atom just can guarantee different
Detection light action is different atom, and detection is different signal；2. multichannel optical pumping atomic magnetic force sensing device is inevitable
Laser of the multi beam as detection light need to be set, and the laser of laser needed for emitting is expensive, and multi-station laser, meeting is such as arranged
The cost for greatly improving entire sensing device, is unfavorable for business promotion.And existing light-splitting method, such as use spectroscope or optics
Beam splitter the disadvantage is that more complicated branch system need to be built, and needs accurately to adjust each eyeglass, and such system is easy vibrated
It is dynamic to influence, cause optical path to deviate, light-splitting method also be divided using optical fiber splitter, but due to laser be it is a kind of partially
Shake preferable coherent source, and the laser polarization after optical fiber splitter branch is poor, and atomic magnetic force sensing device requires detection light
It is polarised light, and optical power is almost the same, therefore, only realizes that the multiple laser of branch is unable to satisfy original by optical fiber splitter
The job requirement of sub- magnetic sensor device.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of multichannel optical pumping atomic magnetic forces
Sensing device is realized the density issue of optical path polarization-maintaining light splitting and the path channels in atomic air chamber, is eliminated between different channels
Interfere with each other, realize pump light optical path share, improve the measurement efficiency of information, reduce the quantity of laser, significantly
Reduce cost.
The purpose of this utility model adopts the following technical scheme that realization:
A kind of multichannel optical pumping atomic magnetic force sensing device, including
At least one light splitting polarization-maintaining Transmission system；
Multiplexed detection light, the detection light include through polarised light obtained by a light splitting polarization-maintaining Transmission system light splitting；
It is connected and receives the atomic magnetic force sensing module of the detection light with light splitting polarization-maintaining Transmission system；
The atomic magnetic force sensing module includes atomic air chamber, and optoelectronic induction corresponding with the detection light quantity
Device, wherein each atomic air chamber is by least the detection light passes through all the way, across the spy of the same atomic air chamber
The spacing for surveying light is greater than diffusion length of the atom under the certain buffer gas air pressure of certain temperature, and the photoelectric sensor setting exists
The detection light emission goes out the side of the atomic air chamber, the signal generated for receiving the detection light and atomic interaction,
Detecting signal unit is connected on the photoelectric sensor；
The light splitting polarization-maintaining Transmission system, including the depolarization module for laser to be become to complete non-polarized light, light splitting mould
Block and the module that is polarized for the laser for becoming complete non-polarized light to be converted to polarised light, the depolarization module and described point
Optical module is connected and described be polarized before module is arranged in.
Further, the spectral module includes optical fiber splitter, and fiber coupling is connected with before the optical fiber splitter
Device, is equipped with optical fiber collimator later, optical fiber collimator setting it is described be polarized module before.
Further, the depolarization module is depolarizer, is arranged before the optical fiber splitter or the fiber optic collimator
After device.
Further, the depolarization module is the big core diameter multimode fibre with certain length, with the optical fiber splitter
It is connected, is arranged between optical fiber splitter and optical fiber collimator.
Further, the spectral module includes the multistage optical fiber splitter, the fiber coupler and first order light
Fine splitter is connected.
Further, the spectral module includes optical spectroscopic device, and the fiber coupler setting is in the optics point
Between electro-optical device and the multistage optical fiber splitter.
Further, several atomic air chambers are arranged in arrays, and each atomic air chamber is at least by the spy all the way
Light is surveyed to pass through.
Further, surface of the detection light perpendicular to the atomic air chamber.
Further, the atomic air chamber is rectangular spherical or cylindrical.
Compared with prior art, the utility model has the beneficial effects that:
It (1), will by the way that laser is carried out depolarization recurrence processing partially or first depolarization light splitting afterwards recurrence processing partially after being first divided
Laser is divided into required amount of multi-path laser, and the power of every road laser is roughly equal, and is polarised light, and the polarised light is as spy
Survey light.
(2) channel in atomic air chamber refers to detecting light all the way across atomic air chamber, detects light and atom is mutual
Effect generates signal, and receives signal by corresponding photoelectric sensor, detects the corresponding photoelectric sensor of light, photoelectricity all the way
Inductor is used to receive the signal that detection light and atomic interaction generate, so that system can obtain the magnetic field detected
Information, at least detection light passes through an atomic air chamber all the way for setting, forms at least one channel, and pass through the same atomic air chamber
The spacing of the detection light be greater than diffusion length of the atom under the certain buffer gas air pressure of certain temperature, avoid adjacent logical
The phenomenon that interfering with each other is easy to appear between road.
Detailed description of the invention
Fig. 1 is the integral frame structure figure of the utility model embodiment；
Fig. 2 is the circuit theory schematic diagram of one embodiment of the light splitting polarization-maintaining Transmission system of the utility model, display
The frame structure being polarized again using the first depolarization light splitting afterwards of depolarizer；
Fig. 3 is the circuit theory schematic diagram of another embodiment of the light splitting polarization-maintaining Transmission system of the utility model, is shown
Show and has been recurred inclined frame structure using depolarization after being first divided of depolarizer；
Fig. 4 is the circuit theory schematic diagram of another embodiment of the light splitting polarization-maintaining Transmission system of the utility model, is shown
Show and has been recurred inclined frame structure using depolarization after being first divided of big core diameter multimode fibre；
Fig. 5 is the structural schematic diagram of the spectral module of one embodiment of light splitting polarization-maintaining Transmission system of the utility model；
Fig. 6 is the structural schematic diagram of the spectral module of another embodiment of the light splitting polarization-maintaining Transmission system of the utility model；
Fig. 7 is the structural schematic diagram of the optical spectroscopic device of the utility model；
Fig. 8 is the theory structure schematic diagram of the optical pumping atomic magnetic force sensing module of the utility model；
Fig. 9 is the configuration schematic diagram of a preferred embodiment of the atomic air chamber of the utility model, and which show single originals
Sub- gas chamber is entered by multiplexed detection light emission；
Figure 10 is according to another configuration schematic diagram of another preferred embodiment of the atomic air chamber of the utility model, display
The arrangement modes of multiple atomic air chambers；
Figure 11 is according to another configuration schematic diagram of another preferred embodiment of the atomic air chamber of the utility model, display
The arrangement mode of round atomic air chamber；
In figure:
10, laser；11, laser；12, optical fiber；13, complete non-polarized light；14, fiber coupler；15, fiber optic collimator
Device；
20, it is divided polarization-maintaining Transmission system；21, depolarization module；211, depolarizer；212, big core diameter multimode fibre；22, it is divided
Module；221, optical fiber splitter；222, optical spectroscopic device；23, it is polarized module；
30, spectrum frequency stabilization module；
40, light is detected；41, circular polarizing disk；
50, atomic magnetic force sensing module；51, atomic air chamber；52, photoelectric sensor；53, temperature control device；54, magnetic force is believed
Number；55, radio-frequency coil；56, detecting signal unit.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
It is described below for disclosing the utility model so that those skilled in the art can be realized the utility model.It retouches below
Preferred embodiment in stating is only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It is retouched following
The basic principle of the utility model defined in stating can be applied to other embodiments, deformation scheme, improvement project, etc. Tongfangs
The other technologies scheme of case and the spirit and scope without departing from the utility model.
It will be understood by those skilled in the art that in the exposure of the utility model, term " longitudinal direction ", " transverse direction ", "upper",
The orientation or position of the instructions such as "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
Above-mentioned term should not be understood as limiting the present invention.
It is understood that term " one " is interpreted as " at least one " or " one or more ", i.e., in one embodiment,
The quantity of one element can be one, and in a further embodiment, the quantity of the element can be it is multiple, term " one " is no
It can be interpreted as the limitation to quantity.
In the present invention, except as otherwise clear stipulaties and restriction, if any term " assembling ", " connected ", " connection " term
It should go to understand as broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It is also possible to machine
Tool connection；It can be directly connected, be also possible to be connected by intermediary, can be and be connected inside two elements.For
For those of ordinary skill in the art, can understand as the case may be above-mentioned term in the present invention specifically contain
Justice.
Referring to attached drawing 1 to Figure 11, the multichannel optical pumping atomic magnetic force sensing device of embodiment according to the present utility model will
Be elucidated in following description, wherein light splitting polarization-maintaining Transmission system 20 solve needed in existing multi-channel detection technology using
The problem of multiple lasers, greatly reduces cost, makes the testing requirements for meeting atomic magnetic force sensing equipment per laser all the way,
And atomic magnetic force sensing module 50 solves the density issue of path channels, eliminate in same atomic air chamber 51 different channels it
Between interfere with each other, improve the measurement efficiency of information.
By the prior art it is found that the mechanism of light and atom are as follows: firstly, inside quantum mechanics, laser or electromagnetism
Frequency interval between wave and atomic energy level only unanimously can be by Atomic absorption, referred to as RESONANCE ABSORPTION.
Secondly, the atom being in magnetic field can generate energy level splitting, the spacing of energy level splitting is related with magnetic field size, referred to as
Zeemen effect.Show as atomic magnetic moment of the atom in magnetic field does precession around magnetic field, and the frequency of precession is Larmor precession
The frequency of frequency, this frequency and above energy level splitting is consistent.
The pumping process of laser: the atom of ground state, which is originally, to be evenly distributed on each sub- energy level, use and atomic energy level
The right-circularly polarized light and atom of resonance act on, and the energy that atom can absorb laser is pumped into excitation state, in the original of excitation state
Son is unstable, can fall at random on the sub- energy level of ground state, different due to falling the probability in ground state, on the magnetic sublevel of side
It is more.
Atom can be pumped into the magnetic sublevel of side after a predetermined time, and laser does not interact with atom,
The performance of macroscopic view is that the power of laser does not change, this when, atom had reached the state of saturation, this process is called partially
Vibration polarization.After atom reaches saturation state, there is a radiofrequency field this when, between the frequency and energy level of radiofrequency field
The frequency of division is if it is correspondence and a kind of effect of RESONANCE ABSORPTION, the energy that atom can absorb radiofrequency field return to respectively
A magnetic sublevel gets on, and is equivalent to and was upset again by the polarized atom of polarization originally, and atom can have an effect again with laser,
The power of laser will because of atom absorption and reduce.
When RF magnetic field frequency and Larmor precession frequency strict conformance, the light intensity of laser is inhaled strongly due to atom
It receives and generates significant change, find this strongest laser intensity absorption point and be assured that current Larmor precession frequency
Current magnetic field value can be calculated according to it for rate.
Radiofrequency signal is to exist always, and be that one kind is indirect and measure inside optical pumping atomic magnetic force sensing device, and photoelectricity is visited
What survey device received is a kind of strength information, and this strength information is related to radiofrequency signal, when the frequency and atom of radiofrequency signal
When Larmor precession frequency is consistent, light intensity signal is maximum, and the radio frequency signal frequency read at this time can derive current magnetic
Field value associates intensity signal and radiofrequency signal so general optical pumping atomic magnetic force sensing device needs to do closed loop, can not
Direct detection.In the following, the present embodiment uses relatively simple MXOptical pumping atomic magnetic force sensing device comes description technique scheme, a side
Face MXOptical pumping atomic magnetic force sensing device has higher sensitivity and frequency response, another aspect MXOptical pumping atomic magnetic force sensing
The technical solution of device is relatively simple, easy to accomplish, but the realization structures and methods of the present embodiment are not by MXOptical pumping atomic magnetic force
Sensing device limitation, can also be MZOptical pumping atomic magnetic force sensing device or Full-optical BB optical pumping atomic magnetic force sensing device.
As shown in Figure 1, which show the multichannel optical pumping atomic magnetic force sensor of embodiment according to the present utility model,
Including
At least one light splitting polarization-maintaining Transmission system 20；
Multiplexed detection light 40, the detection light 40 include polarised light obtained by being divided through a light splitting polarization-maintaining Transmission system 20；
It is connected and receives the atomic magnetic force sensing module 50 of the detection light 40 with light splitting polarization-maintaining Transmission system 20；
The atomic magnetic force sensing module 50 includes the atomic air chamber 51 of an at least Leie time arrangement, and with detection light 40
The corresponding photoelectric sensor 52 of quantity, wherein each atomic air chamber 51 is by least the detection light 40 passes through all the way, institute
State photoelectric sensor 52 the detection light 40 be set and project the side of the atomic air chamber 51, for receive the polarised light with
The signal that atomic interaction generates is connected with detecting signal unit 56 on the photoelectric sensor；
The light splitting polarization-maintaining Transmission system 20, including the depolarization module for laser 10 to be become to complete non-polarized light 13
21, spectral module 22 and module 23 is polarized for what the laser for becoming complete non-polarized light 13 was converted to polarised light, it is described
Depolarization module 21 is connected with the spectral module 22 and described be polarized before module 23 is arranged in.
An atomic air chamber 51 at least needs laser all the way in atomic magnetic force sensing module 50, that is, all the way to detect light 40,
The existing pumping function of detection light 40 in optical pumping atomic magnetic force sensing device has a detection function again, and pumping effect must be and atom
Frequency resonance, and finally detect be laser light intensity, therefore, laser 11 is locked by spectrum frequency stabilization module 30
Frequently, frequency fluctuation bring noise is prevented.The device of the present embodiment at least needs a laser 11 and a light splitting polarization-maintaining
Transmission system 20, as shown in Figure 1, being a laser 11 and a light splitting polarization-maintaining Transmission system 20, detection light 40 is protected through light splitting
If it is main line that inclined Transmission system 20, which is divided, atomic air chamber 51 is passed through.It should be noted that laser quantity in the present embodiment
Unrestricted, optionally, the quantity of the laser of this preferred embodiment may be 2,3,4,5,6,7,8 etc., the present embodiment
It is middle to use semiconductor laser as laser source.
The embodiment of the present apparatus is by carrying out after being first divided depolarization recurrence processing partially or first depolarization light splitting afterwards again for laser
It is polarized processing, laser is divided into required amount of multi-path laser, the power of every road laser is roughly equal, and is polarised light, should
Polarised light can be used as detection light 40, the corresponding photoelectric sensor 52 of each detection light 40, and multiplexed detection light 40 can realize difference
The detection of the state of atom information of position improves detection efficiency；Meanwhile using the pumping function of detection light 40 to atomic air chamber 51
Atom polarize so that atom generate a biggish macroscopic moment.Polarization by detecting the pumping function of light 40 is made
With later, atom generates macroscopic moment, meets multiplexed detection light 40 and shares the progress multiple spot information measurement of atomic air chamber 51
Condition, improve the efficiency of information measurement；In addition, a channel in atomic air chamber 51 refers to that detecting light 40 all the way passes through
Atomic air chamber 51, detection light 40 and atomic interaction generate signal, and pass through corresponding photoelectric sensor 52 reception signal, and one
Road detects the corresponding photoelectric sensor 52 of light 40, and photoelectric sensor 52 is generated for receiving detection light 40 and atomic interaction
Signal so that system can obtain the Magnetic Field detected.
Detection light 40 is by the polarised light that is divided of light splitting polarization-maintaining Transmission system 20, and each atomic air chamber 51 is by least
Detection light 40 passes through all the way.As shown in figure 8, the core of atomic magnetic force sensing module 50 is the atomic air chamber 51 of a sealing, it is former
Helium or alkali metal atom (such as potassium, rubidium, caesium) atom vapor can be set in sub- gas chamber 51, the selection of laser is necessary and former
It is sub consistent, to generate resonant transition.Atomic air chamber 51 needs a temperature control device 53 to keep a constant higher temperature,
So that alkali metal saturated vapor keeps stable, higher concentration；Additionally need a static magnetic field and alternating magnetic field, Ta Mendou
It can be generated by Helmholtz coil, atomic air chamber 51 is externally provided with radio-frequency coil 55, when radio frequency added on radio-frequency coil 55
When frequency is equal to the corresponding Larmor precession frequency in magnetic field, optical magnetic resonance phenomenon, the light of photodetector detection can occur at this time
Electric signal is most strong, using means such as subsequent amplification, sampling, signal processings, can usually scan RF field frequency and be worked as
Then preceding magnetic field value can read the frequency information of radio frequency source to be locked in frequency resonance point using degeneration factor.
Detect light 40 and through circular polarizing disk 41 form a branch of parallel circularly polarized light, then enter atomic air chamber 51, laser and
The frequency of atom is consistent, generates RESONANCE ABSORPTION, and the signal of generation is received by photoelectric sensor 52, and the setting of photoelectric sensor 52 is being visited
The side that light 40 projects the atomic air chamber 51 is surveyed, signal is handled by amplification module, then by digital circuitry,
And it feeds back and locks current magnetic field value into radio-frequency coil 55, tracking current magnetic field variation.
It is now described in detail for each component part of the utility model, temperature control device 53, static magnetic field and alternation magnetic
Field is the prior art, therefore without detailed description.
Laser is polarised light, and for how to realize that polarization optical branching simultaneously transmit by polarization-maintaining, the present embodiment uses and first moves back laser
The mode to the rear being polarized is more specifically that laser is carried out to depolarization recurrence processing partially or first depolarization light splitting afterwards after being first divided
Laser, is first become complete non-polarized light 13, is then become complete non-polarized light 13 using being polarized module 23 by recurrence processing partially
Linearly polarized light reduces power loss, uses for follow-up system, will before or after laser is become complete non-polarized light 13
It is divided into required amount of multichannel light, then polarised light is changed into before use, make the every road laser used power substantially
It is equal, and be polarised light.Whether it is first divided or first carries out depolarization, before the end of transmission, laser is become complete
Non-polarized light 13 is simultaneously polarized, and becomes polarised light.
In order to reduce the volume of entire light splitting polarization-maintaining Transmission system 20, the spectral module 22 in the present embodiment includes optical fiber point
Road device 221, relative to traditional spectroscope or optical beam-splitter, beam splitting system is relatively simple, meanwhile, it is based on optical fiber splitter
221, it is clear that, use optical fiber 12 to connect from optical fiber splitter 221 to optical fiber collimator 15 in the present embodiment, favorably
In reduction equipment volume and system complexity.The type of optical fiber generally comprises single mode optical fiber and multimode fibre, and single mode optical fiber wraps again
Polarization-maintaining single-mode fiber and non-polarization-maintaining single-mode fiber are included, and in some systems required for polarization characteristics of lasers, it can be using guarantor
The stability of inclined single mode optical fiber, this kind of optical fiber is relatively good, can preferably keep the polarization of laser special during laser transmission
Property, but the disadvantage is that, the throughput of this kind of optical fiber is weaker, it be easy to cause laser energy to be lost, and higher using difficulty, price
It is expensive；There are also systems to use multimode fibre, and throughput is high, and use is fairly simple, but stability is not so good as bais single-mode light
Fibre is easy to upset the polarization of laser.And in order to make laser enter optical fiber splitter 221, light is connected with before optical fiber splitter 221
Fine coupler 14 need to be converted into the free light in space before detection light 40 or pump light enter atomic magnetic force sensing module 50, because
This, is connected with optical fiber collimator 15 after optical fiber splitter 221, meanwhile, optical fiber collimator 15, which is arranged, is polarized module 23 described
Before.
Due to being partial poolarized light by the laser of fiber splitter, polarization direction is indefinite, can not be directly using being polarized
Module 23 is changed into linearly polarized light, is easy big lossy laser power, is not available laser.Therefore, point of the present embodiment
Light polarization-maintaining Transmission system 20 is by carrying out depolarization recurrence processing partially or first depolarization light splitting afterwards recurrence place partially after being first divided for laser
Laser, is first become complete non-polarized light 13 by reason, and complete non-polarized light 13 is then become linearly polarized light using being polarized module 23,
Reduce power loss, used for follow-up system, before or after laser is become complete non-polarized light 13, needed for being classified as
The multichannel light of quantity, then polarised light is changed into before use, keep the power in the every road laser used roughly equal, and be
Polarised light.Whether it is first divided or first carries out depolarization, before the end of transmission, laser is become into complete non-polarized light 13 simultaneously
It is polarized, becomes polarised light.Polarization beam apparatus, complete non-polarized light 13 can be used in the module 23 that is polarized in the present embodiment
It is divided into horizontal polarization light and vertical polarised light through polarization beam apparatus, and the power of two-beam is identical.In the utility model
Laser refers to sensu lato equipment that can emit laser, entire treatment process be since laser generates laser, without
It is being projected since laser beam emitting device from laser.The output interface of some laser beam emitting devices is optical fiber in reality, is light
Built in fine coupler 14, in application process, when the first depolarization light splitting afterwards recurrence of progress is handled partially, need in laser beam emitting device
Output interface connects optical fiber collimator 15, and laser is exported, and after 21 depolarization of depolarization module, is passing through another fiber coupler
14 imported into optical fiber splitter 221, are divided；In depolarization recurrence processing partially after be first divided, directly laser is sent out
The output interface of injection device is connected with optical fiber splitter 221, is divided, fiber coupler 14 described in the utility model
Built-in fiber coupler 14 as in laser beam emitting device.
As shown in Figure 2 and Figure 3, a kind of configuration structure of depolarization module 21 is that depolarization module 21 is depolarizer 211, described to move back
Inclined module 21 is depolarizer 211, is arranged before the optical fiber splitter 221 or after the optical fiber collimator 15.It needs to infuse
Meaning, due to including optical fiber splitter 221 in spectral module 22, and depolarizer 211 and the polarizer are optical element, because
This, needs to be arranged fiber coupler 14 and optical fiber collimator 15, the laser that laser issues also need by fiber coupler 14 into
Enter optical fiber splitter 221.
More specifically, as shown in Fig. 2, for a kind of system structure diagram for carrying out first depolarization light splitting afterwards, depolarization module
21 be depolarizer 211, is arranged before optical fiber splitter 221, and laser becomes complete non-polarized light 13 after depolarizer 211,
Then divided by spectral module 22 for multichannel light, the first depolarization light splitting afterwards processing of progress.More specifically, after a kind of first depolarization of progress
In the embodiment for the structure that light splitting recurrence is handled partially, the laser that laser issues first passes around depolarizer 211 and carries out polarization upset,
Become complete non-polarized light 13, complete non-polarized light 13 enters optical fiber splitter 221 by fiber coupler 14, is divided into multichannel
Light, every road laser are transferred to optical fiber collimator 15 by optical fiber, and optical fiber collimator 15 is connected with module 23 is polarized, and injection swashs
Light becomes linearly polarized light again, and being polarized module 23 is polarization beam apparatus, and complete non-polarized light 13 is divided into level through polarization beam apparatus
Polarised light and vertical polarised light, and the power of two-beam is identical.
And as shown in figure 3, depolarization module 21 is depolarizer for a kind of system structure diagram for carrying out depolarization after being first divided
211, it is arranged after optical fiber collimator 15, laser is divided by spectral module 22 for after multichannel light, every Lu Guangjun passes through depolarizer
211 processing become complete non-polarized light 13, carry out depolarization after being first divided and handle.More specifically, first light splitting retreats for a kind of progress
In the embodiment of the structure handled partially that recurs partially, laser enters optical fiber splitter 221 by fiber coupler 14, is divided into multi beam
Laser, then every Shu Jiguang is respectively transmitted to optical fiber collimator 15, and optical fiber collimator 15 is connected with depolarizer 211, will be from
The laser projected in optical fiber collimator 15 becomes complete non-polarized light 13, and the module 23 that is polarized after depolarizer 211 again will be completely non-
Polarised light 13 becomes linearly polarized light, and being polarized module 23 is polarization beam apparatus, and complete non-polarized light 13 is divided into water through polarization beam apparatus
Flat polarised light and vertical polarised light, and the power of two-beam is identical.
Since optical fiber core diameter is thicker, the mode of inside of optical fibre transmitting is more, and the coupling efficiency of laser is higher, but laser is inclined
Vibration also can be more random, therefore, can also be upset the polarization of laser using the big core diameter multimode fibre 212 of certain length, in length
The laser transmitted in enough big core diameter multimode fibres 212 finally can be changed to complete non-polarized light 13, therefore, depolarization module 21
Another configuration structure is, and described as shown in figure 4, depolarization module 21 is the big core diameter multimode fibre 212 with certain length
Optical fiber splitter 221 is connected, and is arranged between optical fiber splitter 221 and optical fiber collimator 15, laser enters optical fiber splitter
It is divided into multichannel light after 221 and respectively enters corresponding big core diameter multimode fibre 212, becomes completely unpolarized in transmission process
Light 13 carries out depolarization after being first divided and handles.
More specifically, as shown in figure 4, laser enters optical fiber splitter 221 by fiber coupler 14, it is divided into multi beam
Laser, then every Shu Jiguang respectively enters corresponding big core diameter multimode fibre 212, becomes complete non-polarized light in transmission process
13, and after exported through optical fiber collimator 15, become polarised light via module 23 is polarized, be polarized module 23 be polarization beam apparatus, it is complete
Full non-polarized light 13 is divided into horizontal polarization light and vertical polarised light through polarization beam apparatus, and the power of two-beam is identical.Through
Experiment can obtain, and it is 400 microns -800 microns that big core diameter multimode fibre 212, which is core diameter, and length is rice magnitude or more.Optical fiber point
The core diameter of multimode fibre in road device 221 is 50 microns or 62.5 microns, from the multimode fibre of fine core diameter to the multimode of thick core diameter
The laser coupling efficiency of optical fiber is very high, is carried out between optical fiber splitter 221 and big core diameter multimode fibre 212 by adapter flange dish
Connection, optical fiber collimator 15 are connected with big core diameter multimode fibre 212.
In addition, the mode of laser light splitting also influences whether that the optical power loss of laser and branch are uniform, the utility model
A kind of configuration structure of spectral module 22 is, including multi-stage fiber splitter 221, and laser or complete non-polarized light 13 pass through optical fiber
Coupler 14 enters the optical fiber splitter 221 of the first order, and the light separated enters several optical fiber splitters 221 of next stage, until
The light of number needed for obtaining.Optical fiber splitter 221 is the common light-dividing device of current communication equipment field, for laser all the way
It is divided into the road n, n usually has 2/4/8/16/32/64 equal-specification, also there are the particular values in addition to above-mentioned numerical value certainly, from optical fiber type
Point, it common are single mode optical fiber splitter 221 and multimode fibre splitter 221, the more difficult operation of single mode optical fiber splitter 221, and
Caused by optical power loss it is larger, expensive, using in the utility model is multimode fibre splitter 221, reduce system
Cost.One optical fiber splitter 221 can serve as spectral module 22 in itself, single when the laser beam quantity of needs is bigger
In the unappeasable situation of a optical fiber splitter 221, multi-stage fiber splitter 221 can be used, next stage optical fiber splitter
221 input interface connects in the output of the optical fiber splitter 221 of upper level, so that exponentially increases the number of output.However,
The adverse consequences such as 221 series of optical fiber splitter is more, will cause optical power loss, and branch is uneven, many laser application systems,
For example the power deviation of the every road laser of atomic magnetic force sensor requirements is no more than 10%, therefore, when practical application, usually uses level-one
Or two-stage optical fiber splitter 221.It will be appreciated by persons skilled in the art that the quantity and specification of optical fiber splitter 221 are at this
It is unrestricted in utility model embodiment, can the laser beam quantity according to needed for practical application be configured, for example, in Fig. 5
Shown in specific example, illustrate and disclose this reality so that the 2 branch optical fiber splitters 221 using two-stage separate 8 road light as an example
8 road light are separated simultaneously with 2 branch optical fiber splitters 221 of the content and feature of the light-splitting method of new embodiment, but use two-stage
It is not to be regarded as the limitation to the content and range of the light-splitting method of this preferred embodiment.Optionally, in the light splitting of the present embodiment
In other possible examples of method, the optical fiber splitter 221 of use is also possible to but is not limited to 4/8/16/32/64 equal-specification,
It is also possible to the particular values in addition to above-mentioned numerical value, and due to the optimization of optical fiber splitter 221 itself, it is also possible to using series
3,4,5 grades etc., the road Shi Mei power deviation meets the requirement of laser application system.
More than optical fiber splitter series, optical power loss will cause, the adverse consequences such as branch is uneven are therefore, excellent
Selection of land, as shown in fig. 6, spectral module 22 further includes optical spectroscopic device 222, optical spectroscopic device 222 is arranged in multi-stage fiber
Before splitter 221, laser or complete non-polarized light 13 are tentatively divided through optical spectroscopic device 222, after preliminary light splitting
Light enters the optical fiber splitter 221 of the first order by fiber coupler 14, then respectively enters several fiber optic splitters of next stage
Device 221, until the light of number needed for obtaining.Laser is divided into n by optical spectroscopic device 222 by the laser beam that laser projects
Road, optical spectroscopic device 222 use the optical devices such as lens, prism, reflective mirror, and laser input is divided into multiple laser output,
The laser of injection and injection at this time is the free light in space, and fiber coupler 14 is arranged after optical spectroscopic device 222, will be through
The laser that optical spectroscopic device 222 separates is accessed through fiber coupler 14 in the optical fiber splitter 221 of rear stage, is carried out further
Light splitting.In practical applications, it is the laser beam emitting device of optical fiber for some output interfaces, the export of optical fiber collimator 15 need to be applicable in
Laser is then divided using optical spectroscopic device 222, using existing optical spectroscopic device 222, it can be achieved that uniformly dividing
Light, the structure of optical spectroscopic device 222 as shown in fig. 7, but be not limited to the light splitting of 8 tunnels shown in Fig. 7, can be according to actual laser
The specification and quantity of beam quantity demand and subsequent optical fiber splitter 221 are configured, and be can be 2,4,8 etc., are also possible to
Particular values in addition to above-mentioned numerical value.It is using the advantages of optical spectroscopic device 222, it is possible to reduce level-one optical fiber splitter
221 so that light splitting more evenly, loss it is smaller.
Spectral module 22 comprising optical spectroscopic device 222 is combined with above-mentioned depolarization module 21, when depolarization module
21 select depolarizer 211, and depolarizer 211 and optical spectroscopic device 222 are optical device, and there are two types of mounting means, a kind of
It is that depolarizer 211 is located between laser and optical spectroscopic device 222, laser, which first passes through depolarizer 211, becomes completely non-inclined
Shake light 13, then enter optical spectroscopic device 222 be tentatively divided, multi beam complete non-polarized light 13 pass through after optical fiber coupling
The optical fiber splitter 221 that clutch 14 enters next stage is further divided；Another kind is that depolarizer 211 is located at optical spectroscopic
Between device 222 and fiber coupler 14, after laser carries out tentatively light splitting by optical spectroscopic device 222, every Shu Guangjun is into mistake
Depolarizer 211 becomes complete non-polarized light 13, is then carried out by the optical fiber splitter 221 that fiber coupler 14 enters next stage
Further light splitting.
As shown in figure 9, which show the single atomic air chambers more than 51 of a preferred embodiment according to the present utility model
Road detects light 40 and injects composition multichannel atomic air chamber 51, and the detection light 40 through light splitting polarization-maintaining transmission module light splitting is transmitted to atom
Magnetic force sensing module 50, more specifically, the atomic air chamber 51 passed through.As described above, one in atomic air chamber 51
Channel refers to that detecting light 40 all the way generates signal across atomic air chamber 51, detection light 40 and atomic interaction, and passes through phase
The photoelectric sensor 52 answered receives magnetic force signal 54, detects the corresponding channel of light 40 all the way.
Have inside atomic air chamber 51 in gaseous atom and buffer gas, atom high speed free movement in space, no
Disconnected to collide with buffer gas molecules, the movement of atomic group is limited in certain area, referred to as diffusion length.In certain temperature
Under degree and buffer gas gas pressure, atom diffusion length is a constant.Inject the adjacent detector in same atomic air chamber 51
The spacing of light 40 needs to be greater than diffusion length, and just can guarantee different detection light 40 effect detections is different atom.Therefore
It must assure that the spacing distance of adjacent atom in same atomic air chamber 51 is greater than diffusion length, multiplexed detection light 40 can be total to
The Magnetic Field of multiple spot is detected with an atomic air chamber 51, while also saving space and cost.
As shown in figure 9,2 tunnels detection light 40 injects single atomic air chamber 51 simultaneously, atomic air chamber 51 is projected in detection light 40
Side setting respective numbers 2 photoelectric sensors 52 be used for receives detection light 40 and atomic interaction generation signal.
In this way, it realizes 2 tunnels detection light 40 while sharing the information measurement that single atomic air chamber 51 carries out at 4 points, improve
Measurement efficiency.
It is noted that the quantity for passing through the detection light 40 of single atomic air chamber 51 is unrestricted in the preferred embodiment
System, for example, illustrating and taking off for detection light 40 passes through single atomic air chamber 51 by 2 tunnels in the specific example shown in attached drawing 9
Reveal the content and feature of the implementation method of the multichannel atomic air chamber 51 of this preferred embodiment, but passes through single atomic air chamber 51
The quantity of detection light 40 is that 2 tunnels can not be considered as in the implementation method to the multichannel atomic air chamber 51 of this preferred embodiment
Hold the limitation with range.Optionally, other in the implementation method of the multichannel atomic air chamber 51 of this preferred embodiment are possible
In example, the quantity across the detection light 40 of single atomic air chamber 51 also can be, but not limited to be implemented as 1,3,4,5,6,7,8
Road etc..
Preferably, multiple atomic air chambers 51 are arranged in matrix, facilitates processing, meanwhile, each atom gas in same row
Room 51 is injected by multiplexed detection light 40, and it is certain in certain temperature to be greater than atom across 40 spacing of detection light of same atomic air chamber 51
Diffusion length under buffer gas air pressure forms multichannel and carries out information measurement, improves the efficiency of information measurement, compact device
Structure, as shown in Figure 10, atomic air chamber 51 line up square matrix, and each atomic air chamber 51 is at least injected by detection light 40 all the way,
The side setting photoelectric sensor 52 corresponding with detection 40 quantity of light of atomic air chamber 51 is projected in detection light 40.Atomic air chamber 51
What is arranged is closer, and the space magnetic field information of acquisition is abundanter, but realizes that difficulty will increase.
As shown in Figure 10,6 atomic air chambers 51 are successively arranged in matrix, 2 atomic air chambers 51 are a column, totally 3 column, often
A atomic air chamber 51 is passed through by 2 tunnels detection light 40, projects the 2 of every side setting respective numbers of atomic air chamber 51 in detection light 40
A photoelectric sensor 52 is used to receive the signal that detection light 40 and atomic interaction generate.In this way, 2 are realized
Road detection light 40 shares the information measurement that single atomic air chamber 51 carries out two o'clock simultaneously, and 6 atomic air chambers 51 are furthermore achieved
6 points of information measurement is carried out simultaneously.
It will be appreciated by persons skilled in the art that the quantity and columns of the atomic air chamber 51 being successively arranged in same row
It is unrestricted in the preferred embodiment, for example, in the specific example shown in attached drawing 10, to be successively arranged in same row
The quantity of atomic air chamber 51 be 2 for come illustrate and disclose this preferred embodiment 51 array of multichannel atomic air chamber realization
The content and feature of method, but the quantity for the atomic air chamber 51 being successively arranged in same row is 2 and can not be considered as to this
The limitation of the content and range of the implementation method of 51 array of multichannel atomic air chamber of preferred embodiment.Optionally, preferred at this
In other possible examples of the implementation method of 51 array of multichannel atomic air chamber of embodiment, successively it is arranged in same row
The quantity of atomic air chamber 51 also can be, but not limited to be implemented as 3,4,5,6,7,8 etc., and columns also can be, but not limited to by reality
Apply is 2,4,5,6,7,8 etc..
Those skilled in the art will also be appreciated that the quantity of the detection light 40 across single atomic air chamber 51 is excellent at this
It selects unrestricted in embodiment, for example, in the specific example shown in attached drawing 10, single atom gas is passed through with 2 tunnels detection light 40
The content and feature of the implementation method of 51 array of multichannel atomic air chamber of this preferred embodiment are illustrated and disclosed for room 51,
But the quantity for passing through the detection light 40 of single atomic air chamber 51 is that 2 tunnels can not be considered as former to the multichannel of this preferred embodiment
The limitation of the content and range of the implementation method of sub- 51 array of gas chamber.Optionally, in the multichannel atom gas of this preferred embodiment
In other possible examples of the implementation method of 51 array of room, the quantity across the detection light 40 of single atomic air chamber 51 can also be with
But it is not limited to be implemented as 1,3,4,5,6,7,8 tunnels etc..
Since the surface of atomic air chamber 51 is there are certain reflection, in order to avoid detection light 40 is reflected to other of system
Position generates interference, it is preferable that the detection light 40 passes through the atomic air chamber 51 perpendicular to the surface of the atomic air chamber 51.
In addition, the shape of atomic air chamber 51 can be rectangular as shown in Figure 10, it can also be spherical shape as shown in Figure 11,
When atomic air chamber 51 is spherical, the light for being not orthogonal to spherical surface can be deformed, and influence testing result, therefore, each spherical shape atom gas
Room 51 is only passed through by detection light 40 all the way, and the side that detection light 40 projects is arranged in photoelectric sensor 52, and detection light 40 passes through ball
The spherical shape of shape atomic air chamber 51, it is vertical with the surface of atomic air chamber 51.Several spherical atomic air chambers 51 can be arranged in a matrix,
As shown in figure 11, it is arranged side by side for 3 spherical atomic air chambers 51, each atomic air chamber 51 is passed through by 1 tunnel detection light 40, light inductance
Answer the quantity of device 52 consistent with the detection quantity of light 40.It is worth noting that, the atomic air chamber 51 being successively arranged in same row
Quantity and columns it is unrestricted in the preferred embodiment, the quantity for being successively arranged in the atomic air chamber 51 in same row can also
With but be not limited to be implemented as 2,4,5,6,7,8 etc., columns also can be, but not limited to be implemented as 2,3,4,5,6,7,8
Deng.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (9)
1. a kind of multichannel optical pumping atomic magnetic force sensing device, which is characterized in that including
At least one light splitting polarization-maintaining Transmission system；
Multiplexed detection light, the detection light include through polarised light obtained by a light splitting polarization-maintaining Transmission system light splitting；
It is connected and receives the atomic magnetic force sensing module of the detection light with the light splitting polarization-maintaining Transmission system；
The atomic magnetic force sensing module includes atomic air chamber, and photoelectric sensor corresponding with the detection light quantity,
Wherein each atomic air chamber is by least the detection light passes through all the way, across the detection light of the same atomic air chamber
Spacing be greater than the diffusion length under atom certain buffer gas air pressure at a certain temperature, the photoelectric sensor is arranged in institute
The side that detection light emission goes out the atomic air chamber is stated, the signal generated for receiving the detection light and atomic interaction, institute
It states and is connected with detecting signal unit on photoelectric sensor；
The light splitting polarization-maintaining Transmission system, including for laser to be become to complete non-polarized light depolarization module, spectral module with
And the module that is polarized for the laser for becoming complete non-polarized light to be converted to polarised light, the depolarization module and the light splitting mould
Block is connected and described be polarized before module is arranged in.
2. multichannel optical pumping atomic magnetic force sensing device as described in claim 1, which is characterized in that the spectral module includes
Optical fiber splitter, the optical fiber splitter are connected with fiber coupler before, are equipped with optical fiber collimator, the fiber optic collimator later
Device setting it is described be polarized module before.
3. multichannel optical pumping atomic magnetic force sensing device as claimed in claim 2, which is characterized in that the depolarization module is to move back
Inclined device is arranged before the optical fiber splitter or after the optical fiber collimator.
4. multichannel optical pumping atomic magnetic force sensing device as claimed in claim 2, which is characterized in that the depolarization module is tool
There is the big core diameter multimode fibre of certain length, be connected with the optical fiber splitter, is arranged in optical fiber splitter and fiber optic collimator
Between device.
5. multichannel optical pumping atomic magnetic force sensing device as claimed in claim 2 or 3 or 4, which is characterized in that the light splitting mould
Block includes the multistage optical fiber splitter, and the fiber coupler is connected with first order optical fiber splitter.
6. multichannel optical pumping atomic magnetic force sensing device as claimed in claim 5, which is characterized in that the spectral module includes
Optical spectroscopic device, the fiber coupler setting is between the optical spectroscopic device and the multistage optical fiber splitter.
7. the multichannel optical pumping atomic magnetic force sensing device as described in claim 1-4 any bar, which is characterized in that several described
Atomic air chamber is arranged in arrays, and each atomic air chamber is at least passed through by the detection light all the way.
8. the multichannel optical pumping atomic magnetic force sensing device as described in claim 1-4 any bar, which is characterized in that the detection
Surface of the light perpendicular to the atomic air chamber.
9. the multichannel optical pumping atomic magnetic force sensing device as described in claim 1-4 any bar, which is characterized in that the atom
Gas chamber is rectangular spherical or cylindrical.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044947A (en) * | 2019-12-24 | 2020-04-21 | 北京航天控制仪器研究所 | Multichannel SERF atomic magnetometer device for magnetoencephalography and application method |
| EP4184184A1 (en) * | 2021-11-19 | 2023-05-24 | Rohde & Schwarz GmbH & Co. KG | Measurement system and method for analyzing rf signals |
-
2018
- 2018-06-07 CN CN201820879545.8U patent/CN208488536U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044947A (en) * | 2019-12-24 | 2020-04-21 | 北京航天控制仪器研究所 | Multichannel SERF atomic magnetometer device for magnetoencephalography and application method |
| CN111044947B (en) * | 2019-12-24 | 2022-05-24 | 北京航天控制仪器研究所 | Multichannel SERF atomic magnetometer device for magnetoencephalography and application method |
| EP4184184A1 (en) * | 2021-11-19 | 2023-05-24 | Rohde & Schwarz GmbH & Co. KG | Measurement system and method for analyzing rf signals |
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