CN108121015A - A kind of atomic population detection system - Google Patents
A kind of atomic population detection system Download PDFInfo
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- CN108121015A CN108121015A CN201810076503.5A CN201810076503A CN108121015A CN 108121015 A CN108121015 A CN 108121015A CN 201810076503 A CN201810076503 A CN 201810076503A CN 108121015 A CN108121015 A CN 108121015A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
- G01V7/02—Details
- G01V7/04—Electric, photoelectric, or magnetic indicating or recording means
Abstract
Present disclose provides a kind of atomic population detection system, this system includes fluorescence excitation device and a pair of of fluorescence collector.When falling on the detecting area of vacuum plant under atomic group, the two beam laser that can successively launch through atomic fluorescence exciter, so that atomic group sends fluorescence respectively, fluorescence signal collection can be got up and switch to current signal to obtain atomic population by atomic fluorescence collector.The atomic fluorescence exciter of the disclosure using cylindrical lens expand plus prismatic reflection by the way of, and atomic fluorescence collector has used Fresnel Lenses and using the method symmetrically detected, so that light path simplifies, greatly reduce size and weight, improve phosphor collection efficiency, and putting orientation and just can overcome the systematic error that Coriolis force effect is brought independent of device, it is especially advantageous for the minimizing of atomic interference gravimeter, removableization and precision improvement.
Description
Technical field
The disclosure belongs to the absolute gravity acceleration analysis field in quantum field of precision measurement, more particularly to a kind of atom
I on population detection system.
Background technology
Atomic interference gravimeter is the prior development direction of quantum accurate measurement, has potential highly sensitive and differentiates
Rate has epochmaking value in various fields such as gravity calibration, resource exploration, inertial navigation, geophysical research.How to realize
It is a current important research direction that high-precision, which can carry atomic interferometer,.
The process of atomic interferometer measurement gravity includes the sunken prisoner of three-dimensional cooling, initial state preparation, Raman interference and final states and visits
It surveys.Wherein final states detection is exactly the detection of atomic population.
Atom falls into prisoner through supercooling, and temperature can reach μ K magnitudes, but still have certain lateral velocity, under atomic group
Diffusion can be expanded during falling.In dropping process, under Raman light action, due to the Doppler effect of atom, only vertical side
The atom that upward speed is less than certain value can just remain, that is, the speed on the vertical direction of atom can be further
It reduces.Shape when final atomic group reaches detecting area is the ellipsoid gas of similar disk.
After Raman interference, atom is in the superposition state of F=1 and F=2.If initial state is to be prepared into F=1 states, when under atomic group
When falling on detecting area, transition probability can be obtained by detecting the ratio between atomicity and total atom number in F=2 states.It, can in experiment
The atomicity of F=2 states is first detected, and then disposes detected atom, so only the atom of remaining F=1 states continues to fall,
F=1 states atom is pumped to after F=2 states by anti-pumping light, then detects the atomicity of this state.To realize the above process, it is necessary to two
Beam identical frequency, the laser of identical light intensity are horizontally driven into detecting area, and atom is allowed to generate fluorescence respectively and between detecting twice
Beat a branch of anti-pumping light.
The fluorescence excitation device of current atom interferometer generally is that beam of laser is expanded into a round hot spot, into spy
Two segment rectangular light spots are intercepted before surveying area again as detection light, most of luminous power is caused all to be wasted.It is another normal
Method is into passing through after a round hot spot laser beam expandingWave plate and PBS are divided into two beams up and down and are intercepted again, this side
Although method can save a part of luminous power compared with upper one kind, the light path complexity and body of fluorescence excitation device are also greatly increased
Product.
, it is necessary to phosphor collection and be focused on lens on photoelectric tube after atom generates fluorescence so that fluorescence signal turns
It is changed to current signal.Since electric current and luminous power size are proportional, in one-shot measurement, can by detect twice size of current it
Than obtaining transition probability.
To ensure the contrast of fluorescence signal, the space multistory angle of phosphor collection is the bigger the better, then the first of collection system
A aperture of lens wants as big as possible and near from detection district center.For the lens of quartz glass material, bore is bigger, thickness
Thicker, the shortest focal length that can accomplish is longer, and the minimum length that collection sleeve can be accomplished is longer or needs multi-disc lens group
It closes so that the weight and volume of collection system greatly increases, and is unfavorable for the miniaturization of atomic interferometer.
Due to inertia, the linear motion that the particle of inertial system linear movement is generated compared with rotating system can be offset,
In order to describe this offset in rotating system, it is necessary to introduce an imaginary power in the equation of motion, here it is Coriolis
Power.And in atomic interference gravimeter, the atomic group for reaching detecting area has certain lateral velocity.As shown in Figure 1, hypothetically
Revolutions angular speed isGravimeter is placed in north latitudePlace, and a part for atomic group in west to velocity componentIn Fig. 1 (a)：By Coriolis forceAtom can there are one the trend toward earth's axis movement.
In Fig. 1 (b)：A component can be generated in gravity direction, beIt is inclined that this may result in the gravity value that we are surveyed
Greatly, value bigger than normalSimilarly, when atomic group another part in east to speed
During component, the gravity value that we are surveyed can be caused less than normal.Also it is easy to get, atomic group is not interfered in North and South direction with velocity component
To institute's check weighing force value.
In order to measure accurate absolute gravity value, the systematic error that Coriolis force is brought must be eliminated or be pressed into one
A sufficiently small value.Assuming that atomic group systemic velocity is 0 in east-west direction component, and the atomicity for moving eastwards and westwards moving
Equal and fluorescence can enter fluorescence collector with identical solid angle, then the gravity offset brought by Coriolis force can phase
Mutually offset.And the method that current fluorescence collector often uses unilateral detection, as shown in Fig. 2, fluorescence collector 2 is placed in original
The east of son group 1, the fluorescence that the part for westwards moving and moving eastwards among atomic group 1 is sent enter fluorescence collector
Solid angle is respectively Ω1And Ω2, wherein Ω1＜ Ω2, for fluorescent acceptor, the atomic group horizontal direction experienced
Bulk velocity is eastwards, to cause institute's check weighing force value less than normal.If North and South direction is put, thing two parts atomic fluorescence can have
There is equal collection efficiency, eliminating Coriolis force influences.But this method needs stringent north and south to put, and has seriously affected atom
The quick of interference gravimeter moves and recovers, and is not suitable for using on non-lab environment even mobile platform.
Disclosure
(1) technical problems to be solved
The disclosure aims to overcome that disadvantages mentioned above existing in the prior art, provides a kind of detection of atomic population
System, including fluorescence excitation device and fluorescence collector.
(2) technical solution
Present disclose provides a kind of atomic population detection system, including fluorescence excitation device and a pair of of fluorescence collector；With
In atomic interference gravimeter, the atomic interference gravimeter includes detecting area；The fluorescence excitation device includes：Main exciter and pair
Exciter, the main exciter include：Laser emitting component, reflection component, diaphragm component and expand component；It is described to expand component
For one group of cylindrical lens, for being expanded to the two beam laser that laser emitting component projects；The pair of fluorescence collector on
The detecting area center symmetric setting, the fluorescence collector include focusing block and acquisition component, and the focusing block is phenanthrene
Nie Er lens groups, for confocal fluorescence.
In some embodiments of the present disclosure, it is saturating that the Fresnel Lenses includes the first Fresnel Lenses, the second Fresnel
Mirror, the acquisition component are the one of which of following three kinds combinations：First combination：Plano-convex cylindrical lens, upper photoelectric tube and lower photoelectricity
Pipe；Second combination：Upper photoelectric tube and lower photoelectric tube；3rd combination：Photoelectric tube.
In some embodiments of the present disclosure, in the focusing block：First Fresnel Lenses and the second Fresnel Lenses
Common optical axis, the detecting area center are located on the optical axis；The cutting face of second Fresnel Lenses and the first Fresnel are saturating
The cutting face of mirror is opposite；When acquisition component is using the first combination, the plano-convex cylindrical lens vertical display, convex surface and described the
Two Fresnel Lenses are opposite, and planar central is located on the optical axis；The upper photoelectric tube, lower photoelectric tube are affixed on the plano-convex column
The plane of lens, and it is symmetrical on the optical axis；When acquisition component is using the second combination, the upper photoelectric tube, lower photoelectric tube
The optical axis is each perpendicular to put up and down, and it is symmetrical on the optical axis；When acquisition component is using the 3rd combination, the photoelectricity
Pipe is put perpendicular to the optical axis, and photosurface center is located on the optical axis；Light selected by three kinds of combinations of the acquisition component
Fulgurite photosensitive area is different.
In some embodiments of the present disclosure, the two beam laser that the laser emitting component projects claim in the detecting area
For upper strata laser and lower floor's laser；When acquisition component is using the first combination or the second combination, what the upper strata laser was excited
The fluorescence of atomic group is focused onto the lower photoelectric tube, and the fluorescence of the atomic group that lower floor's laser is excited is focused onto described
Upper photoelectric tube；When acquisition component is using the 3rd combination, the fluorescence for the atomic group that the upper and lower layer laser is excited is focused
To the photoelectric tube.
In some embodiments of the present disclosure, the laser emitting component includes：First optical fiber collimator, the second optical fiber are accurate
Straight device；The reflection component includes：Right-angle reflecting prism；One group of cylindrical lens include：Plano concave cylindr lens peace pillar lens；
The diaphragm component includes：Double rectangle hole diaphragm.
In some embodiments of the present disclosure, first optical fiber collimator, the second optical fiber collimator are mutually parallel and erect
It is straight fixed, beam of laser is emitted respectively；The Plano concave cylindr lens are located at the emitting light path of first, second optical fiber collimator
On, concave surface is overlapped towards first, second optical fiber collimator, optical axial plane with the spot center of two beam laser；It is described
Right-angle reflecting prism is placed in below the Plano concave cylindr lens, and inclined-plane is in 45 ° with laser propagation direction, the hot spot of two beam laser
Central symmetry of the projection on the inclined-plane on the inclined-plane；The diagonal of two rectangular openings of the double rectangle hole diaphragm is handed over
Point is respectively on the axis of two beam laser；The plane of the plano-convex cylindrical lens faces the double rectangle hole diaphragm, and optical axis is put down
Face is overlapped with the spot center of two beam laser, and the projection of the hot spots of two beam laser in the plane of the plano-convex cylindrical lens is on institute
State the central symmetry of plane.
In some embodiments of the present disclosure, the pair exciter is plane mirror, and the secret note that is in the light is pasted on described flat
On the speculum of face, position is located at projection of the upper strata laser in the plane mirror of first optical fiber collimator transmitting
The latter half.
In some embodiments of the present disclosure, the right-angle reflecting prism is diagonally cut for a cube,
Plate reflectance coating in its inclined-plane；The double rectangle hole diaphragm is the aluminium flake of oxidizing blackening.
In some embodiments of the present disclosure, light path of the laser between the Plano concave cylindr lens peace pillar lens is equal to
The focal length of Plano concave cylindr lens peace pillar lens and.
In some embodiments of the present disclosure, two rectangular opening centers of the double rectangle hole diaphragm respectively with two beam laser
Spot center overlap, the center spacing of two rectangular openings is equal in first optical fiber collimator and the second optical fiber collimator
In the heart away from.
(3) advantageous effect
It can be seen from the above technical proposal that the disclosure has the advantages that：
(1) footpath is reduced to the scheme of two beam laser beam expandings and diaphragm interception light beam as a result of same group of cylindrical lens
To volume, light channel structure is enormously simplified, meets the miniaturization of intervening atom gravitometer and removableization demand.
(2) bore that possesses by Fresnel Lenses is big, focal length is short, the thin feature of thickness, in addition the first Fresnel Lenses
Detection district center is positioned as close to, atomic fluorescence can enter fluorescence gathering system with a very big solid angle and focus on
On photoelectric tube, a very big collection efficiency, and the opposite method for using glass lens group are obtained, using Fresnel Lenses group
Fluorescence collector can be made very compact.
(3) two fluorescence collectors are put on detecting area central symmetry so that each in atomic group same level
Projected position of the atomic fluorescence collection efficiency on detection district center on this horizontal plane is symmetrical, has so as to ensure that in atomic group
It is equal east, the atomic fluorescence collection efficiency of west velocity component, also eliminates the need for the systematic error that Coriolis force is brought, and
Independent of the placing direction of atomic interference gravimeter, it is even mobile flat in different position to greatly facilitate atomic interference gravimeter
Acceleration of gravity measurement is carried out on platform.It is symmetrical to collect fluorescence but also total collection efficiency improves compared with unilateral collection fluorescence
One times, the signal-to-noise ratio of atomic interference gravimeter fluorescence signal is improved, is conducive to improve gravity measurement sensitivity.
Description of the drawings
Fig. 1 is that Coriolis force caused by earth rotation influences schematic diagram, wherein when assuming that atom starts freely falling body,
There are one the initial velocity in horizontal direction westwards, (a) from the overhead of the arctic, Coriolis force suffered by atom is directed toward the earth's axis, (b)
From parallel to equatorial plane direction, this Coriolis force has component in gravity direction.
Fig. 2 be atomic group in have east, west velocity component atomic fluorescence for unilateral collection solid angle schematic diagram.
Fig. 3 is the atomic population detection system structure top view (band installation frame) of the embodiment of the present disclosure.
Fig. 4 be the embodiment of the present disclosure atomic population detection system structure top view (no installation frame, focusing block are
Combination is 1.).
Fig. 5 is the fluorescence excitation device schematic diagram of the embodiment of the present disclosure.
Fig. 6 is the fluorescence collector schematic diagram of the embodiment of the present disclosure (focusing block is to combine 1.).
Fig. 7 is the fluorescence collector schematic diagram of another embodiment of the disclosure (focusing block is to combine 2.).
Fig. 8 is the fluorescence collector schematic diagram of the another embodiment of the disclosure (focusing block is to combine 3.).
【Symbol description】
【The prior art】
1- atomic groups；2- fluorescence collectors.
【The disclosure】
Detecting area in 10- vacuum structures；11- atomic groups；12- atomic groups；13rd, the optical window of 14- detecting areas；201-
The main exciter of fluorescence excitation device；202- fluorescence excitation device pair exciters；21st, 22- optical fiber collimators；23- Plano concave cylindr lens；24-
Right-angle reflecting prism；25- rectangular opening diaphragms；26- plano-convex cylindrical lens；27- speculums；28- is in the light secret note；30th, 30 '-fluorescence is received
Storage (frame)；31st, 31 '-the first Fresnel Lenses；32nd, 32 '-the second Fresnel Lenses；33rd, 33 '-plano-convex cylindrical lens；34、
34 '-upper photoelectric tube；35th, 35 '-lower photoelectric tube；36th, 36 '-upper photoelectric tube；37th, 37 '-lower photoelectric tube；38th, 38 '-photoelectric tube.
Specific embodiment
Below in conjunction with the attached drawing in embodiment and embodiment, the technical solution in the embodiment of the present disclosure is carried out it is clear,
Complete description.Obviously, described embodiment is only disclosure part of the embodiment, instead of all the embodiments.Base
Embodiment in the disclosure, those of ordinary skill in the art obtained without making creative work it is all its
His embodiment belongs to the scope of disclosure protection.
The embodiment of the present disclosure provides a kind of atomic population detection system, including：Fluorescence excitation device and fluorescence collector.
As shown in Figure 5 and Figure 6, atomic interference gravimeter include detecting area 10, the atomic population detection system for pair
Atomic group 11 and atomic group 12 in detecting area 10 carry out final states detection.In the present embodiment, atomic group 11 is similar circle with 12
The ellipsoid gas of disk, in one example, three axis of ellipsoid are respectively 15mm, 15mm, 2mm.
The fluorescence excitation device of the present embodiment, as shown in figure 3, including：Main exciter 201 and secondary laser 202.Main exciter
201 are respectively arranged at two opposite sides of detecting area with secondary laser 202.
Shown in referring also to Fig. 4 and Fig. 5, main exciter 201 includes：It is optical fiber collimator 21 and 22, Plano concave cylindr lens 23, straight
Corner reflection prism 24, double rectangle hole diaphragm 25, plano-convex cylindrical lens 26；Secondary exciter 202 includes：Plane mirror 27, be in the light it is black
Item 28.
Optical fiber collimator 21 is identical with model selected by optical fiber collimator 22, and the two is mutually parallel and fixes vertically, in the two
In the heart away from for 14mm, a branch of exploring laser light is emitted respectively, the diameter of laser facula is 4mm.
Plano concave cylindr lens 23 are located on the emitting light path of optical fiber collimator 21 and 22, focal length f1=-9.7mm, center are thick
Spend h1=2mm, concave upright, i.e., towards optical fiber collimator 21 and 22, optical axial plane is overlapped with two beam laser spot centers.
After laser facula passes through Plano concave cylindr lens 23, only spread in one direction.
Right-angle reflecting prism 24 is that the cube of a length of side 25.4mm is diagonally cut, inclined-plane plating reflection
Film.Right-angle reflecting prism 24 is placed in 23 lower section of Plano concave cylindr lens, and inclined-plane is in 45 ° with laser propagation direction, two beam laser lights
Central symmetry of projection of the spot on 24 inclined-plane of right-angle reflecting prism on the inclined-plane, the inclined-plane center and Plano concave cylindr lens 23 are flat
The distance l in face1=41mm.
The aluminium flake of the oxidizing blackening for the rectangular opening that double rectangle hole diaphragm 25 digs out two 2mm × 15mm for one.Two rectangular openings
Diagonal intersection point distance for 14mm, diagonal intersection point is respectively on the axis of two beam laser.The effect of double rectangle hole diaphragm
It is that excessive laser facula is cropped to suitable shape, while has also intercepted the more uniform central part of hot spot light intensity.
The focal length f of plano-convex cylindrical lens 262=75.6mm, center thickness h2=5mm, plane face double rectangle hole diaphragm 25,
Its optical axial plane is overlapped with two beam laser spot centers.Projection of two laser faculas in the plane of plano-convex cylindrical lens 26 is on this
The central symmetry of plane, the inclined-plane centre distance l of the planar central and right-angle reflecting prism 242=19.6mm.
Secondary exciter 202 is the plane mirror 27 of a diameter 25.4mm, and the secret note that is in the light 28 is pasted on plane mirror 27,
Position is located at the laser (hereinafter referred to as upper strata laser) of the transmitting of optical fiber collimator 21 in the latter half of the projection of plane mirror 27.
The inclined-plane center of right-angle reflecting prism 24, the planar central of plano-convex cylindrical lens 26,10 center of detecting area, plane mirror 27
Face center on same straight line.
According to said structure, equivalent optical path of the two beam laser between the peaceful pillar lens 26 of Plano concave cylindr lens 23 can be obtained,
It is just the sum of focal length of the peaceful pillar lens 26 of Plano concave cylindr lens 23, i.e.,Two
Beam center is expanded by main exciter at a distance of the circular laser of 14mm, intercepts the rectangular laser into two beam 2mm × 15mm, enters spy
Survey area 10 so that atomic reorganization sends fluorescence.Obviously, the centre distance of atomic group 11 and atomic group 12 is also 14mm.
The fluorescence excitation device of the present embodiment when completing to drop down onto detecting area 10 under the atom of interventional procedures, initially passes through upper strata
Laser, the atomic reorganization of F=2 states generate fluorescence, and due to the presence for the secret note 28 that is in the light, the atom of F=2 states is completed to detect
It is just blown off afterwards and detects district center.After F=2 state atoms are blown away, a branch of back suction overlapped with Raman light is squeezed on vertical direction
Light is transported, in the atom pumping of F=1 states to F=2 states.Remaining atom falls on lower floor's laser under continuing when, spontaneous radiation generates
Fluorescence.
As shown in figure 3, the atomic population detection system of the present embodiment includes two fluorescence collectors, spy is respectively arranged at
Other two opposite side in area is surveyed, on 10 central symmetry of detecting area.
As shown in fig. 6, to fluorescence collector of the focusing block for combination 1., illustrated with wherein one side.Phosphor collection
Device includes：Frame 30 and the first Fresnel Lenses 31 being arranged in frame 30, the second Fresnel Lenses 32, plano-convex column are saturating
Mirror 33, upper photoelectric tube 34, lower photoelectric tube 35.
First Fresnel Lenses 31 is identical with 32 model of the second Fresnel Lenses, diameter 50.8mm, thickness 1.5mm, focal length
32mm.Two Fresnel Lenses are coaxial, and 10 center of detecting area is located on the optical axis, using this optical axis as systematic optical axis.In order to obtain
The solid angle of bigger is obtained, the centre distance of the plan range detecting area 10 of the first Fresnel Lenses 31 is as small as possible, by detecting area
10 sizes are limited, which is 29mm.The cutting face of second Fresnel Lenses 32 and the cutting face phase of the first Fresnel Lenses 31
It is right.
Due to light source i.e. atomic group 11 and 12 for ellipsoid, it is necessary to which plano-convex cylindrical lens 33 are the picture in horizontal direction
Difference further reduces.33 vertical display of plano-convex cylindrical lens, convex surface are opposite with the second Fresnel Lenses 32.Plano-convex cylindrical lens 33
Planar central is located on systematic optical axis, and l is denoted as with the distance of 32 plane one end of the second Fresnel Lensesa。
Model shore pine S1337-66BR selected by upper photoelectric tube 34, lower photoelectric tube 35, photosensitive area are 5.8 × 5.8mm2,
The plane of plano-convex cylindrical lens 33 is affixed on, i.e. photoelectric tube photosurface and the distance of 32 plane one end of the second Fresnel Lenses is also equal to
la.Upper and lower photoelectric tube 34,35 is symmetrical on systematic optical axis.The distance of each photoelectricity tube hub and systematic optical axis is denoted as lb。
(in figure 6, should as shown in fig. 6, the fluorescence for the atomic group 11 that upper strata laser is excited is focused onto lower photoelectric tube 35
Light path is drawn with solid line), the fluorescence for the atomic group 12 that lower floor's laser is excited is focused onto (in figure 6, the light of photoelectric tube 34
Road is drawn in phantom).
It is optimized by Zemax softwares, in the present embodiment, works as la=29.7mm, lbDuring=7mm, aberration is minimum, makes
Luminous power as big as possible can be received by obtaining photoelectric tube.For 15 × 15 × 2mm3Times of ellipsoid atomic group 11, atomic group 12
Meaning one, phosphor collection efficiency are 14.7%.If making point light source into, other parameter is constant, then phosphor collection efficiency is 21.1%.
Opposite side fluorescence collector is identical with above-mentioned fluorescence collector structure and the course of work, also includes：Frame 30 ', with
And it is arranged at the first Fresnel Lenses 31 ', the second Fresnel Lenses 32 ', plano-convex cylindrical lens 33 ', upper photoelectric tube in frame 30 '
34 ', lower photoelectric tube 35 ', details are not described herein.
As shown in fig. 7, it is similar with Fig. 6 situations for fluorescence collector of the focusing block for combination 2., it simply eliminates flat
Pillar lens 33, and photoelectric tube model makes shore pine S7501 into, and photosensitive area is 11 × 6mm2.The upper photoelectric tube 36, lower light
Fulgurite 37 is each perpendicular to the optical axis and puts (long side level is put) up and down, and symmetrical on the optical axis.Pass through Zemax softwares
It optimizes, works as la=29mm, lbDuring=7mm, aberration is minimum so that photoelectric tube can receive luminous power as big as possible.For
15×15×2mm3Any one of ellipsoid atomic group 11, atomic group 12, phosphor collection efficiency are 17.1%.If make light into
Source, other parameter is constant, then phosphor collection efficiency is 21.6%.
As shown in figure 8, it is similar with Fig. 6 situations for fluorescence collector of the focusing block for combination 3., it simply eliminates flat
Pillar lens 33, and two photoelectric tubes make into only with one, model shore pine S2744-08, and photosensitive area is 10 × 20mm2。
The photoelectric tube 38 is located at (i.e. l on optical axis perpendicular to the optical axis (short side level is put), photosurface centerb=0).With it is above-mentioned
1., 2. difference, two atomic fluorescences up and down for combining fluorescence collector 3. are all focused onto on same photoelectric tube 38 for combination,
Can two atomic fluorescence signals be extracted by the time difference respectively.It is optimized by Zemax softwares, works as laDuring=25.8mm,
Aberration is minimum so that photoelectric tube can receive luminous power as big as possible.For 15 × 15 × 2mm3Ellipsoid atomic group 11, original
Any one of son group 12, phosphor collection efficiency are 17.0%.If making point light source into, other parameter is constant, then phosphor collection is imitated
Rate is 21.7%.
The atomic population detection system of the embodiment of the present disclosure expands and diaphragm interception light beam as a result of cylindrical lens
Scheme can carry out atomic fluorescence excitation, in addition right angle is reflected with very small luminous power with regard to that can generate required rectangular light beam
The use of prism, reduces radial direction volume and anti-pumping light is not horizontally oriented and squeezes into detecting area, but in the vertical direction
Conjunction beam is carried out with Raman light, enormously simplifies light channel structure so that entire fluorescence excitation device is maintained at the volume of a very little, symbol
Close the miniaturization of intervening atom gravitometer and removableization demand.
The bore that possesses by Fresnel Lenses is big, focal length is short, the thin feature of thickness, in addition the first Fresnel Lenses to the greatest extent may be used
Energy ground can enter fluorescence gathering system with a very big solid angle and be focused onto light close to detection district center, atomic fluorescence
On fulgurite, a very big collection efficiency, and the opposite scheme for using glass lens group are obtained, using Fresnel Lenses group
Fluorescence collector can be made very compact.Again because two fluorescence collectors are put on detecting area central symmetry so that former
Projected position pair of each atomic fluorescence collection efficiency on detection district center on this horizontal plane in son group same level
Claim, have the atomic fluorescence collection efficiency of east, west velocity component equal in atomic group so as to ensure that, also eliminate the need for Ke Liao
The systematic error that sharp power is brought, and independent of the placing direction of atomic interference gravimeter, greatly facilitate intervening atom weight
Power instrument carries out acceleration of gravity measurement on different position even mobile platform.Compared with unilateral collection fluorescence, symmetrically collect glimmering
Light improves the signal-to-noise ratio of atomic interference gravimeter fluorescence signal, is conducive to improve but also total collection efficiency doubles
Gravity measurement sensitivity.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art
There should be clear understanding to the disclosure.
It should be noted that in attached drawing or specification text, the realization method that does not illustrate or describe is affiliated technology
Form known to a person of ordinary skill in the art, is not described in detail in field.In addition, above-mentioned definition to each element and not only limiting
Various concrete structures, shape or the mode mentioned in embodiment, those of ordinary skill in the art can carry out simply more it
Change or replace, such as：
(1) direction term mentioned in embodiment, such as " on ", " under ", "front", "rear", "left", "right" etc. are only ginsengs
The direction of attached drawing is examined, is not used for limiting the protection domain of the disclosure；
(2) above-described embodiment can be based on the considerations of design and reliability, and the collocation that is mixed with each other uses or and other embodiment
Mix and match uses, i.e., the technical characteristic in different embodiments can freely form more embodiments.
Particular embodiments described above has carried out the purpose, technical solution and advantageous effect of the disclosure further in detail
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiments of the disclosure, is not limited to the disclosure, it is all
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (10)
1. a kind of atomic population detection system, including fluorescence excitation device and a pair of of fluorescence collector；For intervening atom gravity
Instrument, the atomic interference gravimeter include detecting area；
The fluorescence excitation device includes：Main exciter and secondary exciter, the main exciter include：Laser emitting component, reflection
Component, diaphragm component and expand component；The component that expands is one group of cylindrical lens, for two beams projected to laser emitting component
Laser is expanded；
The pair of fluorescence collector on the detecting area center symmetric setting, the fluorescence collector include focusing block and
Acquisition component, the focusing block is Fresnel Lenses group, for confocal fluorescence.
2. atomic population detection system as described in claim 1, the Fresnel Lenses includes the first Fresnel Lenses, the
Two Fresnel Lenses, the acquisition component are the one of which of following three kinds combinations：
First combination：Plano-convex cylindrical lens, upper photoelectric tube and lower photoelectric tube；
Second combination：Upper photoelectric tube and lower photoelectric tube；
3rd combination：Photoelectric tube.
3. atomic population detection system as claimed in claim 2, in the focusing block：First Fresnel Lenses and second
Fresnel Lenses common optical axis, the detecting area center are located on the optical axis；The cutting face of second Fresnel Lenses and the
The cutting face of one Fresnel Lenses is opposite；
When acquisition component is using the first combination, the plano-convex cylindrical lens vertical display, convex surface and second Fresnel are saturating
Mirror is opposite, and planar central is located on the optical axis；The upper photoelectric tube, lower photoelectric tube are affixed on the flat of the plano-convex cylindrical lens
Face, and it is symmetrical on the optical axis；
When acquisition component is using the second combination, the upper photoelectric tube, lower photoelectric tube are each perpendicular to the optical axis and put up and down, and
It is symmetrical on the optical axis；
When acquisition component is using the 3rd combination, the photoelectric tube is put perpendicular to the optical axis, and photosurface center is located at described
On optical axis；
The photoelectric tube photosensitive area that three kinds of combinations of the acquisition component are selected is different.
4. atomic population detection system as claimed in claim 2, the two beam laser that the laser emitting component projects are in institute
It states and is known as upper strata laser and lower floor's laser in detecting area；
When acquisition component is using the first combination or the second combination, the fluorescence for the atomic group that the upper strata laser is excited is focused
The fluorescence of the atomic group excited to the lower photoelectric tube, lower floor's laser is focused onto the upper photoelectric tube；
When acquisition component is using the 3rd combination, the fluorescence for the atomic group that the upper and lower layer laser is excited is focused onto institute
State photoelectric tube.
5. atomic population detection system as claimed in claim 2, the laser emitting component includes：First fiber optic collimator
Device, the second optical fiber collimator；The reflection component includes：Right-angle reflecting prism；One group of cylindrical lens include：Plano concave cylindr lens
Peaceful pillar lens；The diaphragm component includes：Double rectangle hole diaphragm.
6. atomic population detection system as claimed in claim 5, first optical fiber collimator, the second optical fiber collimator phase
Mutual parallel and vertical fixation, is emitted beam of laser respectively；
The Plano concave cylindr lens are located on the emitting light path of first, second optical fiber collimator, concave surface towards described first,
Second optical fiber collimator, optical axial plane are overlapped with the spot center of two beam laser；
The right-angle reflecting prism is placed in below the Plano concave cylindr lens, and with laser propagation direction in 45 °, two beams swash on inclined-plane
Central symmetry of projection of the hot spot of light on the inclined-plane on the inclined-plane；
The diagonal intersection point of two rectangular openings of the double rectangle hole diaphragm is respectively on the axis of two beam laser；
The plane of the plano-convex cylindrical lens faces the spot center weight of the double rectangle hole diaphragm, optical axial plane and two beam laser
It closes, central symmetry of the projection on the plane of the hot spots of two beam laser in the plane of the plano-convex cylindrical lens.
7. atomic population detection system as described in claim 1, the pair exciter is plane mirror, and the secret note that is in the light is glued
It is affixed on the plane mirror, position is located at the upper strata laser of first optical fiber collimator transmitting in the plane reflection
The latter half of the projection of mirror.
8. atomic population detection system as claimed in claim 5, the right-angle reflecting prism is a cube along diagonal
Wire cutting forms, inclined-plane plating reflectance coating；The double rectangle hole diaphragm is the aluminium flake of oxidizing blackening.
9. atomic population detection system as claimed in claim 5, laser the Plano concave cylindr lens peace pillar lens it
Between light path be equal to Plano concave cylindr lens peace pillar lens focal length and.
10. atomic population detection system as claimed in claim 5, two rectangular opening centers point of the double rectangle hole diaphragm
Spot center not with two beam laser overlaps, and the center spacing of two rectangular openings is equal to first optical fiber collimator and the second light
The center spacing of fine collimator.
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| CN201810076503.5A CN108121015B (en) | 2018-01-25 | 2018-01-25 | Atomic population detection system |
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| CN201810076503.5A CN108121015B (en) | 2018-01-25 | 2018-01-25 | Atomic population detection system |
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| CN108121015B (en) | 2024-03-29 |
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