CN103760560B - A kind of longitudinal relevance imaging method based on cold atom matter wave - Google Patents
A kind of longitudinal relevance imaging method based on cold atom matter wave Download PDFInfo
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- CN103760560B CN103760560B CN201410043417.6A CN201410043417A CN103760560B CN 103760560 B CN103760560 B CN 103760560B CN 201410043417 A CN201410043417 A CN 201410043417A CN 103760560 B CN103760560 B CN 103760560B
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- ripple
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4788—Diffraction
Abstract
The present invention relates to a kind of longitudinal relevance imaging method based on cold atom matter wave.Longitudinal relevance imaging method based on cold atom matter wave comprises the steps：Produce cold atom matter wave；The cold atom matter wave is produced into semiochemicals ripple and reference material ripple by matter wave beam splitter；The reference material ripple is carried out into longitudinal multimetering；The semiochemicals ripple is projected into longitudinal potential field to be measured；Semiochemicals ripple after longitudinal field effect, is also apart from detection maximum magnitude is carried out into bucket measurement and is associated with the multimetering result of the reference material ripple, obtain the distributed image of longitudinal potential field.The present invention adopts the wave source for having the cold atom matter wave rather than light wave of quality as relevance imaging, with the resolution capability to potential fields such as gravitational field, light field, electromagnetic fields, the basic physical message such as the quality in local environment, light field, electromagnetic field can be detected.
Description
Technical field
The present invention relates to a kind of matter wave relevance imaging method.
Technical background
Relevance imaging (ghost imaging) is a kind of new image-forming mechanism.It is special using the partial ocoherence or quantum entanglement of light source
Property, realize the diffraction image that object has nanometer resolution is obtained in the light path without object.Relevance imaging is widely used
In distributed image process, distributed awareness and the communications field.With the optical rise of cold atom in recent years, various correlations exist
Realize (referring to scientific paper Schellekens, M.eta/.Hanbury Brown Twiss Effect in matter wave field
Ultracold Quantum Gases SC/ENCE2005310,648-651).Cold atom matter wave has abundant interior state knot
Structure, is easy to experiment manipulation.The wavelength ratio light wave of cold atom matter wave is shorter, possesses the imaging point of less diffraction limit and Geng Gao
Resolution, can carry out the transmission of many bit quantum informations (referring to patent as the information carrier of relevance imaging：A kind of matter wave is closed
It is unified into as production method and its device, publication number：CN103412304A).Above method has the advantages that suitable, but can not realize
Measurement to longitudinal potential field, main cause is the method to be designed, longitudinal information of matter wave to measure lateral object structure
It is not retained.Matter wave has quality, and its wave function will under the field effect, is also apart from detection maximum magnitude of the longitudinal direction such as gravitational field, light field, electromagnetic field
Can change.This change can be used to measure longitudinal potential field.
Formerly in technology, have and a kind of (participate in scientific paper come the method for realizing time domain relevance imaging using counterfeit hot light pulse
Shirai, T.,T. ＆ Friberg, A.T.Temporal ghost imaging with classical non-
stationary pulsed light.J.Opt.Soc.Am.B201027,2549-2555).Above method can be used for time-varying
Image objects, but longitudinal potential field cannot be measured, main cause is that the method adopts counterfeit hot light pulse as information carrier.
Light wave does not have quality, does not have interior state.The longitudinal direction such as gravitational field, light field, electromagnetic field potential field cannot produce impact to light wave fields.This causes
The distribution of longitudinal potential field can not be measured based on the relevance imaging method of light wave, the application and popularization of relevance imaging method is limited.
The content of the invention
Present invention aims to the deficiency of first technology, there is provided a kind of longitudinal direction association based on cold atom matter wave
Imaging method.
The purpose of the present invention is achieved by the following technical solution, a kind of longitudinal direction association based on cold atom matter wave
Imaging method, its step is：
(1) produce cold atom matter wave；
(2) the cold atom matter wave is produced into semiochemicals ripple and reference material ripple by matter wave beam splitter；
(3) the reference material ripple is carried out into longitudinal multimetering；
(4) the semiochemicals ripple is projected the longitudinal potential field in space exploration；
(5) the semiochemicals ripple after longitudinal field effect, is also apart from detection maximum magnitude is carried out into bucket measurement and multiple spot with the reference material ripple
Measurement result is associated, and obtains the distributed image of longitudinal potential field.
Cold atom matter wave of the present invention be using laser cooling means prepare low temperature cold atom cloud, its propagation side
To overlapping for longitudinal direction and with acceleration of gravity direction.
Matter wave beam splitter of the present invention is by the raman laser pulse shaping resonated with atomic energy level.
Longitudinal multimetering of the present invention is specially：The resonance laser irradiation that the direction of propagation is transversely to the machine direction is described
Reference material ripple, Jing after matter wave absorbs, transmission laser is received by CCD surface detectors, the laser intensity that CCD surface detectors are obtained
Distributed intelligence is reference material ripple density distributed intelligence.
When the present invention is associated measurement to the object, as longitudinal correlation function in the cold atom source isThe pass of semiochemicals ripple and reference material ripple after object is projected then
Connection data,
Wherein n1(z1) be CCD surface detectors obtain reference material ripple atomic density, n2(z2)It is that barrel detector is obtained
Semiochemicals ripple atomic density, t2 be matter wave from beamsplitter to the time of bucket detector, m (z) is described to be measured
The distribution function of longitudinal potential field, M are atomic masses,It is planck constant, Г (z1, Z2) be the diffraction matter wave single order
Correlation function
Wherein K1It is matter wave from the beamsplitter to the propagation function of the surface detector, K1(z1 ′, z1)=1, K2
It is matter wave from the beamsplitter to the propagation function of the bucket detector
Wherein g is acceleration of gravity.
The beneficial effects of the present invention is,
(1) using cold atom matter wave rather than light wave as relevance imaging wave source, matter wave has quality, can take
The longitudinal potential field information of band.
(2) using cold atom matter wave rather than light wave is used as the wave source of relevance imaging, with shorter wavelength, possess more
The features such as high imaging resolution.
(3) the method expands the measurable range of relevance imaging, can be used for the spy to longitudinal gesture distribution in local environment
Survey, have a good application prospect.
Description of the drawings
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is embodiment of the present invention.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, and following examples are explanation of the invention,
It is the reasonable application form of the present invention, and the invention is not limited in following examples.
Fig. 1 is referred to, Fig. 1 is the theory diagram of the embodiment of the present invention.The longitudinal direction association based on cold atom matter wave
Imaging system includes material wave producer 1, matter wave beam splitter 2, CCD surface detectors 3, longitudinal potential field 4, bucket detector 5, data
Processor 6.The material wave producer 1, produces cold atom matter wave；The matter wave beam splitter 2 is by with atomic energy level altogether
The raman laser pulse shaping shaken；The CCD surface detectors 3 are made up of multiple CCD, for the Density Distribution to reference material ripple
Carry out multimetering；Longitudinal potential field 4 is object to be imaged；After the bucket detector 5 is used to detect the longitudinal potential field 4 of projection
The semiochemicals ripple；The data processor 6 is used for the signal for receiving the bucket detector 5 and the CCD surface detectors 3,
And both are associated into process, obtain the image of longitudinal potential field 4.The data processor 6 is computer
Fig. 2 is embodiment of the present invention.With reference to Fig. 2, the one kind for describing the present invention in detail is based on cold atom material
The key step of longitudinal relevance imaging method of ripple：
(1) relevant parameter of the material wave producer l is set, cold atom matter wave is produced.
(2) the cold atom matter wave is made to freely fall to matter wave beam splitter 2 under gravity.
(3) incident cold atom matter wave is divided into reference material ripple and semiochemicals ripple by the matter wave beam splitter 2.
(4) the density distribution of the reference material ripple of the CCD surface detectors 3 pairs carries out multimetering, measures number
According to being input in the data processor 6.
(5) the semiochemicals ripple is projected the longitudinal potential field 4 in space exploration.
(6) 5 pairs of semiochemicals ripples by longitudinal potential field of the bucket detector carry out bucket measurement, and measurement data is input to institute
State in data processor 6.
(7) measurement data of the CCD surface detectors 3 of the data processor 6 pairs and bucket detector 5 is associated place
Reason, will the CCD surface detectors 3 and the longitudinal potential fields 4 of bucket detector 5 pairs be associated measurement, described in Jing, data processor 6 is closed
The data of translocation amount are
Wherein n1(z1) be CCD surface detectors obtain reference material ripple atomic density, n2(z2) it is that barrel detector is obtained
Semiochemicals ripple atomic density, t2Be matter wave from beamsplitter to the time of bucket detector, m (z) is longitudinal direction to be measured
The distribution function of potential field, M are atomic masses,It is planck constant, Γ (z1, z2) be the diffraction matter wave single order association letter
Number '
Wherein K1It is matter wave from the beamsplitter to the propagation function of the surface detector, K1(z1 ′, z1)=l, K2
It is matter wave from the beamsplitter to the propagation function of the bucket detector
Wherein g is acceleration of gravity.
The present embodiment realizes measurement of the matter wave relevance imaging to longitudinal Distribution of Potential Field, and closes with structure design
The features such as reason, part are few.
Claims (3)
1. a kind of longitudinal relevance imaging method based on cold atom matter wave, it is characterised in that comprise the steps：
(1) produce cold atom matter wave；The cold atom matter wave is the low temperature cold atom cloud prepared using laser cooling means,
Its direction of propagation is longitudinal direction, and overlaps with acceleration of gravity direction；Longitudinal correlation function of the cold atom material wave source is,
(2) the cold atom matter wave is produced into semiochemicals ripple and reference material ripple by matter wave beam splitter；The material
Ripple beam splitter is by the raman laser pulse shaping resonated with atomic energy level；
(3) the reference material ripple is carried out into longitudinal multimetering；
(4) the semiochemicals ripple is projected the longitudinal potential field in space exploration；
(5) the semiochemicals ripple after longitudinal field effect, is also apart from detection maximum magnitude is carried out into bucket measurement and multimetering with the reference material ripple
As a result it is associated, obtains the distributed image of longitudinal potential field.
2. a kind of longitudinal relevance imaging method based on cold atom matter wave according to claim 1, it is characterised in that institute
State longitudinal multimetering to be specially：The resonance laser that the direction of propagation is transversely to the machine direction irradiates the reference material ripple, Jing references
After matter wave absorbs, transmission laser is received by CCD surface detectors, and the laser intensity distribution information that CCD surface detectors are obtained is
Reference material ripple density distributed intelligence.
3. a kind of longitudinal relevance imaging method based on cold atom matter wave according to claim 1, it is characterised in that right
Semiochemicals ripple and reference material ripple when longitudinal potential field is associated measurement, after the cold atom matter wave projection object
Associated data,
Wherein n1(z1) be CCD surface detectors obtain reference material ripple atomic density, n2(z2) it is a barrel letter for detector acquisition
The atomic density of number matter wave, t2Be semiochemicals ripple from beamsplitter to the time of bucket detector, m (z) is longitudinal direction to be measured
The distribution function of potential field, M are atomic masses,It is planck constant, Γ (z1, z2) be semiochemicals ripple single order correlation function
Wherein K1It is reference material ripple from the beamsplitter to the propagation function of the surface detector, K1(z1', z1)=1, K2
It is semiochemicals ripple from the beamsplitter to the propagation function of the bucket detector
Wherein g is acceleration of gravity.
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| CN103412304A (en) * | 2013-07-05 | 2013-11-27 | 中国计量学院 | Matter wave correlated image generation method and device thereof |
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| "激光致冷和冷原子的应用";王义道;《物理教学》;20090131;第31卷(第1期);第2-5页 * |
| "热光场无分束器非局域成像研究";贺拾贝 等;《光学学报》;20101130;第30卷(第11期);第3332-3335页 * |
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