CN206709779U - A kind of white light quantum interference system - Google Patents
A kind of white light quantum interference system Download PDFInfo
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- CN206709779U CN206709779U CN201720347804.8U CN201720347804U CN206709779U CN 206709779 U CN206709779 U CN 206709779U CN 201720347804 U CN201720347804 U CN 201720347804U CN 206709779 U CN206709779 U CN 206709779U
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- light
- birefringent prism
- prism polarizer
- spectrometer
- wave plate
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Abstract
A kind of white light quantum interference system is the utility model is related to, including：In same optical axis, according to the incident direction of light, LED light source, collimation lens, the first birefringent prism polarizer, birefringece crystal and the second birefringent prism polarizer are followed successively by；The collimated lens of the light source sent are converted to and are converted to linearly polarized light through the first birefringent prism polarizer after directional light by LED light source, when impinging perpendicularly on birefringece crystal surface, produce birefringence, in crystals, produce o light and e light, what it is through birefringece crystal will be that the direction of propagation is consistent and have certain phase difference but the orthogonal two-beam of light vector direction of vibration, again after the second birefringent prism polarizer, only pass through along the light of the second birefringent prism polarizer polarization direction, after obtaining the relevant polarised light of two beams, it is connected to by optical fiber on spectrometer, the utility model uses white light source make it that cost is low, and device is simple and practical, stable performance, it is small by extraneous bad border influence factor.
Description
Technical field
The utility model belongs to optics preparation field, more particularly to a kind of white light quantum interference system.
Background technology
Displacement measurement is very common in present e measurement technology, and extremely important, by the measurement to displacement, can between
Connect a variety of physical quantitys such as measurement vibration, flow, acceleration.The modern industry is developed rapidly so that microdisplacement measurement technology is particularly heavy
Will, to the requirement also more and more higher, and developing towards the direction such as dynamic, online, real-time of its sensitivity, the degree of accuracy.Some aviations
The test in field, it is also desirable to carried out under specific condition, such as radiation, burn into high temperature, high pressure, high speed or small space；Also exist
In mechanical industry, in order to improve the precision of precision finishing machine, and the stability of structure and reliability are being held, it is necessary to detect it
The dynamic deformation of working machine under the conditions of load, dynamic deformation field (such as high-rating generator or various big machinery main shafts of such as big machinery
Deformation in operation process), the deformation of machine tool guideway at work etc.；Deformation under building industry jackshaft load bearing beam in addition
Detections of Engineering Structure Distortion situation such as detection, dam, ship etc., and the monitoring to geological disasters such as landslide, earth subsidence, snowslides
It is required for measuring, to obtain the dynamic metrical information of measurement object.Typically conventional microdisplacement measurement means have capacitance method and light
Lever method etc., both make it that measurement accuracy is relatively low for different reasons.Capacitance method is vulnerable to external electromagnetic interference and spuious
The influence of electric capacity, parasitic capacitance；And the measurement accuracy of optical lever method reaches 10 rans.Therefore, high-precision white light quantum
The application study of weak e measurement technology is just particularly important.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of white light quantum interference system, made using white light source
It is low to obtain cost, and device is simple and practical, stable performance, it is small by extraneous bad border influence factor.
The utility model is achieved in that a kind of white light quantum interference system, including：
In same optical axis, according to the incident direction of light, LED light source, collimation lens, the first birefringence rib are followed successively by
The mirror polarizer, birefringece crystal and the second birefringent prism polarizer；LED light source changes the collimated lens of the light source sent
To be converted to linearly polarized light through the first birefringent prism polarizer after directional light, obtained linearly polarized light, impinge perpendicularly on two-fold
When penetrating plane of crystal, birefringence is produced, in crystals, produces o light and e light, what it is through birefringece crystal will be the direction of propagation
Unanimously and there is certain phase difference but the orthogonal two-beam of light vector direction of vibration, then be polarized by the second birefringent prism
After device, only along the light of the second birefringent prism polarizer polarization direction by after obtaining the relevant polarised light of two beams, passing through light
Fibre is connected on spectrometer, using spectrometer with regard to that can be readily achieved data acquisition, can obtain the changing value of phase difference.
Further, the first birefringent prism polarizer and the second birefringent prism polarizer are inclined using Glan-Taylor
Shake the model GT5-A of device, has 5mm clear aperature, operation wavelength 350-700nm.
Further, birefringece crystal includes the first half-wave plate, the second half-wave plate, first half-wave plate and the first birefringence
Prism polarizer angle at 45 °, second half-wave plate and first half-wave plate are into θ angle, by rotating second half-wave plate, change two
Phase difference between beam polarised light.
Further, collimation lens is through being selected from quartz lens, BK-7 glass lens or BaF10/FD10 glass lens.
Further, spectrometer selects HR4000 high resolution micro fiber spectrometers, and incident light passes through SMA905 optical fiber
Interface enters spectrometer, and through being irradiated to after being collimated by after slit on grating, light beam is by wavelength point after optical grating diffraction light splitting
Open, be irradiated on linear CCD array, disposably obtain full spectrum, spectrometer is communicated by USB port to be connected between computer
Connect.
Compared with prior art, beneficial effect is the utility model：
The utility model uses white light source make it that cost is low, and device is simple and practical, stable performance, is influenceed by extraneous bad border
Factor is small.The most important application of the system is relative gravity field measurement, gravity gradient can be accurately measured, in resource exploration and military affairs
All have the function that in terms of investigation huge.
Brief description of the drawings
Fig. 1 is the structural representation for the system that the utility model embodiment provides；
The circuit theory diagrams for the constant-current source that Fig. 2 the utility model embodiments provide.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Referring to Fig. 1, a kind of white light quantum interference system, including：In same optical axis, according to the incident direction of light,
LED light source 1, collimation lens 2, the first birefringent prism polarizer 3, birefringece crystal and the second birefringent prism is followed successively by rise
Inclined device 6；The collimated lens of the light source sent are converted to and changed through the first birefringent prism polarizer 3 after directional light by LED light source
For linearly polarized light, obtained linearly polarized light, when impinging perpendicularly on birefringece crystal surface, birefringence is produced, in crystals, production
Raw o light and e light, what it is through birefringece crystal will be that the direction of propagation is consistent and have certain phase difference but light vector direction of vibration phase
Mutually vertical two-beam, then after the second birefringent prism polarizer, only along the side of polarization of the second birefringent prism polarizer 6
To light by after obtaining the relevant polarised light of two beams, being connected on spectrometer 7 by optical fiber, can just be facilitated using spectrometer
Ground data acquisition, the changing value of phase difference can be obtained.
Referring to Fig. 2, in the present embodiment, after 220V alternating currents are converted into ± 12V DC electricity, in order to promote LED luminous two
Pole pipe light stability, cheap operational amplifier is used to form constant-current source for core, output current 20mA, precision is 0.005, by mistake
Poor 0.1mA, constant current effect are preferable.
Due to the result of amplifier virtual earth so that operational amplifier OP07 reverse input ends voltage is 0, is hindered because amplifier inputs
It is anti-high, it is believed that input does not have electric current, therefore the electric current flowed through from 1.5k resistance is fixed and size is equal to and put from computing
Big device OP07 output ends flow into the electric current of PT100 platinum resistance sensors, and 1.5k resistance connects a precision voltage source
LM336-2.5, external adjustment circuit, it ensure that the effect for reaching constant current.
When transmitting different degrees of decay can occur for light, so selection optical fiber transmission can reduce decay, especially with
The anti-negative sense components of the XSR types Xtreme of premium grade, it is possible to achieve maximum light transmission.In order to farthest reduce
Decay when light transmits, selected optical fiber model QP450-2-XSR.XSR products are the optical fiber and probe of premium grade
One of series of products, the long 2m of the optical fiber, internal diameter 450um, the wave-length coverage that can pass through is 180-900nm, is mainly characterized by having
There is high transparency and very sturdy and durable, each component has aluminized coating, stainless steel BX outer packings, and joint uses high property
(SMA905 connectors are a kind of contactless connectors to the SMA905 connectors of energy, there is a threaded coupling nut and one
Individual straight lock pin, lock pin material are made of stainless steel), ensure that optical fiber and other components closely connect.Select the model
Optical fiber can stablize transmission signal, ensure minimum signal drift.
The first birefringent prism polarizer and the second birefringent prism polarizer use the model of Glan-Taylor's polarizer
For GT5-A, the clear aperature with 5mm, operation wavelength 350-700nm.
Further, birefringece crystal includes the first half-wave plate 4, the second half-wave plate 5, first half-wave plate 4 and first pair
Refracting prisms polarizer angle at 45 °, second half-wave plate 5 and first half-wave plate 4 are into θ angle, by rotating second half-wave plate,
Change the phase difference between two beam polarised lights.
Birefringece crystal is using two half wave plate groups into half-wave plate is exactly o light and e light when the light transmission of normal incidence
Between phase difference be equal to π or its odd-multiple, such chip is referred to as half wave plate, abbreviation half-wave plate [16].Linear polarization
Light impinges perpendicularly on half-wave plate, and transmitted light is still linearly polarized light, and half-wave plate can rotate to linearly polarized light, if when incident
Angle between vibration plane and principal section of crystal is θ, then the vibration plane of the linearly polarized light transmitted turns over 2 from original orientation
θ angles.In system building, first half-wave plate and first Glan-Taylor prism angle at 45 °, second half-wave plate and first
Half-wave plate is into θ angle, when rotating second half-wave plate simultaneously, it is possible to change the phase difference between two beam polarised lights, change
Corresponding optical path difference, so as to extrapolate mechanical displacement to be measured.
It is further preferred that collimation lens pass through selected from quartz lens (74-UV), BK-7 glass lens (74-UV) and
BaF10/FD10 glass lens (74-ACR).
Spectrometer selects HR4000 high resolution micro fiber spectrometers, and incident light enters light by SMA905 optical fiber interfaces
Spectrometer, through being irradiated to after being collimated by after slit on grating, light beam is separated by wavelength after optical grating diffraction light splitting, is irradiated to line
Property ccd array on, disposably obtain full spectrum, spectrometer is communicated by USB port and connected between computer.
System is built：
The output of general ± 12V constant pressure sources is connected on 20mA constant-current source, is powered with this power supply to whole system.By LED light
Source light emitting diode is directly coupled in optical fiber internal diameter, and the light sent passes through the multiple full transmitting of optical fiber, is connected through SMA905 joints
To collimation lens, the light now projected is directional light, and to the rear, out just a branch of is played through the first birefringent prism polarizer
Linearly polarized light, when light incides birefringece crystal surface from left vertical, produce birefringence, in crystals, produce o light and
E light, what it is through chip will be that the direction of propagation is consistent and have certain phase difference but orthogonal two beam of light vector direction of vibration
Light, then after the second birefringent prism polarizer (angle is β/2 between two polarizers), only along polarizer polarization direction
Light could be by, so there is coherent condition through the light of polarizer, then obtain the relevant polarised light of two beams, then with addition
One collimation lens receives, and through SMA905 joints coupled in optical fiber, is connected on HR4000 fiber spectrometers, utilizes light
Spectrometer can obtain the changing value of phase difference, and spectroscopic studying amount with regard to that can be readily achieved data acquisition.
Detection process：
Spectrometer is connected on computer by USB interface, spectrum number is carried out using marine optics spectrometer software kit
According to collection, the time, too short meeting make it that exposure is weaker, therefore data collection interval is 0.5s, and data are preserved into txt file, made
Digital independent is carried out with the GUI editing machines of Matlab softwares, using secondary Gauss curve fitting, draws spectrum and the graph of a relation of luminous intensity
And crest location and time chart.When β is fixed (β is bigger), second half-wave plate is rotated, makes itself and first half-wave plate
It is into θ angle, the α at each moment is measured successively, observes the change of spectroscopic studying amount.Interpretation of result：
According to above-mentioned measuring method, because whole system is adjusted manually so that β is very big, has 1 ° between two half-wave plates
Angle, cause spectroscopic studying not sensitive enough.Measured, the index that the system reaches is：
(1) ocean color instrument software kit gathered data obtains spectrum, centre frequency 635nm, spectral bandwidth 55nm；
(2) noise range：0.02nm；
(3) when β is fixed, second half-wave plate is rotated, when making it with first half-wave plate into 30 °, that is, adjusts α, can be with
It was found that spectroscopic studying 0.05nm：
By observing phenomenon, the result obtained after analysis matches with theory.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (5)
- A kind of 1. white light quantum interference system, it is characterised in that including：In same optical axis, according to the incident direction of light, it is followed successively by LED light source, collimation lens, the first birefringent prism and rises Inclined device, birefringece crystal and the second birefringent prism polarizer；LED light source is converted to the collimated lens of the light source sent flat Linearly polarized light is converted to through the first birefringent prism polarizer after row light, obtained linearly polarized light, impinges perpendicularly on birefringence crystalline substance During body surface face, birefringence is produced, in crystals, produces o light and e light, what it is through birefringece crystal will be that the direction of propagation is consistent And there is certain phase difference but the orthogonal two-beam of light vector direction of vibration, then by the second birefringent prism polarizer Afterwards, only along the light of the second birefringent prism polarizer polarization direction by after obtaining the relevant polarised light of two beams, passing through optical fiber It is connected on spectrometer, using spectrometer with regard to data acquisition can be readily achieved, the changing value of phase difference can be obtained.
- 2. according to the white light quantum interference system described in claim 1, it is characterised in that the first birefringent prism polarizer and The second birefringent prism polarizer uses the model GT5-A of Glan-Taylor's polarizer, has 5mm clear aperature, operating wave A length of 350-700nm.
- 3. white light quantum interference system as claimed in claim 1, it is characterised in that birefringece crystal include the first half-wave plate, Second half-wave plate, first half-wave plate and the first birefringent prism polarizer angle at 45 °, second half-wave plate and first half-wave Piece is into θ angle, by rotating second half-wave plate, changes the phase difference between two beam polarised lights.
- 4. white light quantum interference system as claimed in claim 1, it is characterised in that collimation lens is passed through selected from quartz lens, BK- 7 glass lens or BaF10/FD10 glass lens.
- 5. white light quantum interference system as claimed in claim 1, it is characterised in that spectrometer is micro- from HR4000 high-resolution Type fiber spectrometer, incident light enter spectrometer by SMA905 optical fiber interfaces, through being irradiated to after being collimated by after slit On grating, light beam is separated by wavelength after optical grating diffraction light splitting, is irradiated on linear CCD array, is disposably obtained full spectrum, light Spectrometer is communicated by USB port and connected between computer.
Priority Applications (1)
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| CN201720347804.8U CN206709779U (en) | 2017-04-05 | 2017-04-05 | A kind of white light quantum interference system |
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| CN201720347804.8U CN206709779U (en) | 2017-04-05 | 2017-04-05 | A kind of white light quantum interference system |
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| CN206709779U true CN206709779U (en) | 2017-12-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061755A (en) * | 2018-07-22 | 2018-12-21 | 四川大学 | High-precision microgravity acceleration measurement device and measurement method based on the weak measurement of quantum |
-
2017
- 2017-04-05 CN CN201720347804.8U patent/CN206709779U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061755A (en) * | 2018-07-22 | 2018-12-21 | 四川大学 | High-precision microgravity acceleration measurement device and measurement method based on the weak measurement of quantum |
| CN109061755B (en) * | 2018-07-22 | 2019-11-26 | 四川大学 | High-precision microgravity acceleration measurement device and measurement method based on the weak measurement of quantum |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |