CN106325032A - Digital holographic recording device with off-axis angle precisely adjustable in real time - Google Patents
Digital holographic recording device with off-axis angle precisely adjustable in real time Download PDFInfo
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- CN106325032A CN106325032A CN201610860608.0A CN201610860608A CN106325032A CN 106325032 A CN106325032 A CN 106325032A CN 201610860608 A CN201610860608 A CN 201610860608A CN 106325032 A CN106325032 A CN 106325032A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/10—Processes or apparatus for producing holograms using modulated reference beam
Abstract
The invention discloses a digital holographic recording device with off-axis angle precisely adjustable in real time. Compared with the digital holographic recording device in prior art, a small monitoring optical path and a fine-tuning screw to adjust the reflector are added as a manner to control and measure the off-axis angle. Through the use of the designed optical path of the digital holographic recording device of the invention, it is possible to adjust and detect the reflecting direction of the reference light to realize the conversion of the coaxial off-axis holography. It is also possible to adjust and detect the magnitude of the off-axis angles and obtain the best off-axis angle in the off-axis holography so that an original image can be well separated and the CCD resolution and spatial bandwidth are effectively utilized. It is also possible to correct the optical recovery error caused by the slight inclination of the reference light in the coaxial digital holography.
Description
Technical field
The present invention relates to a kind of off-axis angle real-time accurate adjustable digital hologram recording equipment.
Background technology
In many three-dimensional imagings and Display Technique, holography is the three-dimensional imaging technology that effect is best up to now
One of.This technology utilizes reference light as carrier wave, interferences with Object light wave and forms interference fringe, (object light information is included amplitude
And phase place) be solidified in interference fringe form hologram, with reproduction light-wave irradiation hologram, original object light is shaken again during reproduction
Width diffraction out, continues to propagate forward.Direct transmission light and the interference of negative one level picture during in order to avoid reproducing, generally use off-axis record
Mode, i.e. reference light and object light have certain angle between the direction of propagation.When holographic recording, the resolution of record medium limits
The maximum of off-axis angle, and record the size of object, resolution and recording distance and limit the minima of off-axis angle.From
Shaft angle degree should not be the biggest or the least, and angle is too big, then cannot accurate recording interference fringe；Angle is the least, then cannot be kept completely separate
Go out original object light.
The complicated procedures such as develop a film owing to eliminating the holographic fixing development of optics wet method, overcome and can not pinpoint lack
Point, the digital hologram occurred in recent years obtains widely should at scientific research, engineering, biomedical a lot of aspect
With.Digital hologram replaces photographic plate recording interference fringe with modern photoelectric recording device CCD, uses computer disposal interferogram, permissible
Effectively utilize powerful modern computing technology.But limited by processing technology, the resolution of existing CCD in micron dimension, than
Low 1-2 the order of magnitude of resolution of silver salt dry plate.When this just requires digital hologram record, off-axis angle is less, typically at 2-3 degree
Hereinafter, ensure that enough off-axis angles are to separate original picture again simultaneously.
There are the following problems in actual applications for existing digital hologram recording equipment:
(1) present off-axis gaussian beam optical path adjusting relies primarily on the experience of experimenter and technical ability substantially determines also do not have
The technology having maturation accurately determines off-axis angle, it is impossible to accurately control off-axis angle size.
(2), when judging off-axis angle, propagation distance after the distance of both object light and reference light hot spot and beam splitting is relied primarily on
Ratio calculate off-axis angle, but, owing to object light and reference light hot spot have certain size, distance to be therebetween difficult to standard
Really measuring, easily cause the incorrect of off-axis angle, can only repeatedly regulate, efficiency is low.
(3) experimentation is caused reference path by accidentalia, such as vibrations, single optics by imprudence collision
Deviation, needs to restart to regulate light path；When needing to change object to be recorded, if the size of object to be recorded and resolution are sent out
Changing, light path to be readjusted.
(4) prior art needs to regulate in advance off-axis angle, it is impossible to changes in real time according to the needs in experimentation, detects
The size of off-axis angle, makes troubles to experiment, affects experiment effect and precision.
(5) in holographic measurement and imaging technique are applied, the conversion of off-axis light path and coaxial light path needs again to build light
Road.
(6) there are some researches prove, in-line holographic reference light inclination can introduce error into recovery object light, causes reconstruction Object light wave
Front curve, reduces certainty of measurement and image quality.
Summary of the invention
For above-mentioned technical problem present in prior art, it is adjustable that the present invention proposes a kind of off-axis angle real-time accurate
Digital hologram recording equipment, it adopts the following technical scheme that
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment, including LASER Light Source, beam splitter, two
Number beam splitter, bundling device, No. two bundling devices, reflecting mirror, No. two reflecting mirrors, No. three reflecting mirrors, space filterings
Beam-expanding collimation system, No. two space filtering beam-expanding collimation systems, a CCD, No. two CCD and computer；Wherein, based on No. one point
Bundle device, No. two bundling devices, a reflecting mirror and No. three reflecting mirrors form a rectangle for holographic interference record and interfere
Light path；It is used for monitoring reference light inclines based on No. two beam splitters, a bundling device, No. two reflecting mirrors and No. three reflecting mirror formation one
No. two rectangle optical interference circuits of rake angle；The trend of a number rectangle optical interference circuit is: the laser beam that LASER Light Source sends is through one
Being divided into two bundles after number beam splitter, wherein, the light beam after a beam splitter transmission is through a reflecting mirror reflection and a sky
Between filter after beam-expanding collimation system and become object light illumination light, this road plane wave illumination to object forms diffraction object light, through phenanthrene
Arrive on the memorization COMS clip of a CCD after Nie Er diffraction and No. two bundling device reflections, the light beam after a beam splitter reflection
Become reference light, reference light after No. two space filtering beam-expanding collimation systems transmitted through No. two beam splitters, then by three
The reflection of number reflecting mirror, more successively transmitted through a bundling device and No. two bundling devices, finally it is radiated at the memorization COMS clip of a CCD
On；The trend of No. two rectangle optical interference circuits is: reference light after No. two space filtering beam-expanding collimation systems transmitted through No. two beam splitting
Device, then sequentially pass through No. three reflecting mirrors and a bundling device reflection, finally it is radiated on the memorization COMS clip of No. two CCD；Through No. two
The reference light of beam splitter reflection, then through No. two reflecting mirror reflections and the memorization COMS clip of bundling device transmission No. two CCD of arrival
On；A rectangle optical interference circuit and No. two rectangle optical interference circuits are respectively provided with the corresponding rectangle optical interference circuit of control be in
Work or a shutter of halted state and No. two shutters；Rear side at No. three reflecting mirrors is provided with set screw, is used for adjusting institute
State pitching or the level angle of No. three reflecting mirrors；A number CCD and No. two CCD is connected with computer respectively.
Preferably, a shutter is between a bundling device and No. two bundling devices；No. two shutters are positioned at No. two beam splitters
And between No. two reflecting mirrors.
Preferably, when a shutter is opened and during No. two shutter closes, and only No. one rectangle optical interference circuit is in work shape
State；When No. two shutters are opened and during a shutter close, and only No. two rectangle optical interference circuits are in running order.
Preferably, through No. two beam splitters and the reflection of No. two reflecting mirrors arrive laser beam on No. two CCD memorization COMS clip with
It is dry that laser beam on No. three reflecting mirrors and bundling device reflection No. two CCD memorization COMS clip of arrival interferes formation detection
Relate to striped.
Preferably, before digital hologram recording equipment uses, adjust a rectangle optical interference circuit and No. two rectangles interfere light
Road is in parallel coaxial state.
Preferably, described set screw includes horizontal adjustment screw and vertical set screw.
Preferably, a described CCD and No. two CCD has identical resolution.
Compared to prior art, present invention have the advantage that
1, the present invention is provided with reference light monitoring light path, utilizes the distribution of interference fringe can accurately obtain off-axis angle, with
Time can control accurate to off-axis angle, reach the best angle of off-axis gaussian beam, enable reproduction image to be just kept completely separate, effectively
Utilize resolution and the spatial bandwidth of CCD.
2, the present invention can regulate off-axis angle in experimentation the most in real time, and size is different with resolution
The off-axis angle that needs of object different, can regulate the most in real time.
3, the present invention can not change light path, only by accurately control according to measuring and the needs of imaging in experimentation
The direction of reference light processed, it is achieved coaxial light path and the conversion of off-axis light path, improves conventional efficient.
4, the monitoring of the reference light in present invention light path utilizes two Plane reference light directly to measure angle of inclination, can adjust in real time
Joint.
5, the present invention is based on Digital Holography, measures the precision of angle up to ten thousand/radian.Digital hologram is tested
Building of light path is fairly simple, and the angle measurement method of employing is easier to realize.
6, the present invention can also correct the object light restoration errors that in coaxial digital holography, reference light small skew causes.
Accompanying drawing explanation
Fig. 1 is the index path of a kind of off-axis angle real-time accurate adjustable digital hologram recording equipment in the present invention；
Fig. 2 is the interferogram (when reference light does not tilts) of No. two CCD record monitoring light paths in the present invention；
Fig. 3 is the interferogram (when reference light tilts) of No. two CCD record monitoring light paths in the present invention；
Fig. 4 is an object light of a CCD record and reference light interferogram (when reference light tilts) in the present invention；
Fig. 5 is another object light of a CCD record and reference light interferogram (when reference light tilts) in the present invention；
Reduzate light phase figure when Fig. 6 is that in the present invention, reference light tilts；
Fig. 7 is an object light and the reference light interferogram (when reference light does not tilts) of a CCD record in the present invention；
Fig. 8 is another object light and the reference light interferogram (when reference light does not tilts) of a CCD record in the present invention；
Reduzate light phase figure when Fig. 9 is that in the present invention, reference light does not tilts；
Figure 10 is the reduzate light phase figure after correcting during reference light inclination in the present invention；
Wherein, 1-LASER Light Source, number beam splitter of 2-, No. bis-beam splitters of 3-, number bundling device of 4-, No. bis-bundling devices of 5-,
Number reflecting mirror of 6-, No. bis-reflecting mirrors of 7-, No. tri-reflecting mirrors of 8-, No. bis-CCD, 11-computers of 9-number a CCD, 10-, 12-mono-
Space filtering beam-expanding collimation system, No. bis-space filtering beam-expanding collimation systems of 13-, number shutter of 14-, No. bis-shutters of 15-, 16-
Object.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the present invention is described in further detail by detailed description of the invention:
Shown in Fig. 1, a kind of off-axis angle real-time accurate adjustable digital hologram recording equipment, including LASER Light Source 1,
4, No. two bundling devices of 3, bundling device of 2, No. two beam splitters of a number beam splitter, 6, No. two reflecting mirrors of 5, reflecting mirror 7, three
8, space filtering beam-expanding collimation system of reflecting mirror, 13, CCD9 of 12, No. two space filtering beam-expanding collimation systems, No. two
CCD10 and computer 11.Wherein,
A rectangle is formed based on a beam splitter 5, reflecting mirror 6 of 2, No. two bundling devices and No. three reflecting mirrors 8
Optical interference circuit, for holographic interference record.
No. two rectangles are formed based on No. two beam splitters 4, No. two reflecting mirrors 7 of 3, bundling device and No. three reflecting mirrors 8
Optical interference circuit, for monitoring the angle of inclination of reference light.
Light path in the case of reference light the most indicated by the solid line is coaxial with object light, i.e. in-line holographic recording beam path；Use dotted line
Represent actual light path when reference light is off-axis, i.e. off-axis gaussian beam recording beam path.
The effect of a number space filtering beam-expanding collimation system 12 and No. two space filtering beam-expanding collimation systems 13 is to swash
The laser beam that radiant sends carries out space filtering beam-expanding collimation, and both can use existing device in prior art.
The trend of a number rectangle optical interference circuit is:
The laser beam that LASER Light Source 1 sends is divided into two bundles after a beam splitter 2, after the transmission of a beam splitter 2
Light beam after the reflection of reflecting mirror 6 and a space filtering beam-expanding collimation system 12, become object light illumination light, this road
Plane wave illumination forms diffraction object light on object 16, arrives a CCD9's after fresnel diffraction and No. two bundling device reflections
On memorization COMS clip, the light beam after beam splitter 2 reflection becomes reference light, and reference light expands standard through No. two space filterings
Transmitted through No. two beam splitters 3 after lineal system 13, then reflected by No. three reflecting mirrors 8, more successively transmitted through bundling device 4 He
No. two bundling devices 5, are finally radiated on the memorization COMS clip of a CCD9.
The trend of No. two rectangle optical interference circuits (the dotted line frame being positioned in Fig. 1) is:
Reference light transmitted through No. two beam splitters 3, then sequentially passes through three after No. two space filtering beam-expanding collimation systems 13
Number reflecting mirror 8 and a bundling device 4 reflect, and are finally radiated on the memorization COMS clip of No. two CCD10；Reflect through No. two beam splitters 3
Reference light, then arrive on the memorization COMS clip of No. two CCD10 through the reflection of No. two reflecting mirrors 7 and bundling device 4 transmission.
The laser beam on No. two CCD memorization COMS clip is arrived and through No. three through No. two beam splitters and No. two reflecting mirror reflections
Reflecting mirror and a bundling device reflection arrive the laser beam on No. two CCD memorization COMS clip and interfere formation detection interference fringe.
A rectangle optical interference circuit and No. two rectangle optical interference circuits are respectively provided with the corresponding rectangle of control and interfere light
Road is in work or a shutter 14 of halted state and No. two shutters 15.
Concrete, a shutter 14 is between a bundling device 4 and No. two bundling devices 5；No. two shutters 15 are positioned at No. two
Between beam splitter 3 and No. two reflecting mirrors 7.
When a shutter 14 is opened and No. two shutters 15 are closed, only No. one rectangle optical interference circuit is in running order；
When No. two shutters 15 are opened and a shutter 14 is closed, only No. two rectangle optical interference circuits are in running order.
Additionally, the rear side at No. three reflecting mirrors 8 is provided with set screw (not shown), for adjusting No. three reflecting mirrors 8
Pitching or level angle.A number CCD9 and No. two CCD10 is connected with computer 11 respectively.
Above-mentioned set screw includes horizontal adjustment screw and vertical set screw.Wherein, horizontal adjustment screw is used for adjusting
The level angle of No. three reflecting mirrors 8, vertical set screw is for adjusting the luffing angle of No. three reflecting mirrors 8.
Before digital hologram recording equipment uses, first regulate the parallel and coaxial of light path, make a rectangle optical interference circuit and two
Number rectangle optical interference circuit is all in parallel coaxial state.If needing to record coaxial digital holography figure, then light path has reached work
Make state.In the case of strict, in coaxial digital holography, reference light wave needs coaxial with Object light wave, and tends not in an experiment
Reaching this requirement, reference light is more or less and not coaxial between object light.No. two CCD10 can monitor in experimentation and join
Examine the inclination conditions of light, it is ensured that the success of coaxial recording.Even if reference light run-off the straight, also can be processed by record and interfere bar
Stricture of vagina, it is thus achieved that angle of inclination, is corrected measurement result.The horizontal or vertical tune after No. three reflecting mirrors 8 can certainly be regulated
Joint screw carries out on-line tuning, and need not readjust whole light path.At this moment need to observe the interference on No. two CCD10
The width of striped judges that light path is the most coaxial, and interference fringe broadens, then off-axis angle diminishes；Fringe-width exceeds No. two
CCD10 Chip-wide, then it is believed that reach coaxial state.Obviously, pitching or the level angle of No. three reflecting mirrors 8 of regulation just regulates
Reference light, relative to the angle between object light, makes light path be in off-axis or coaxial digital holography recording status.Analyze further
Fringe distribution on No. two CCD10, it is possible to accurately obtain the size of off-axis angle, it is achieved the most accurately monitoring of off-axis angle.
Under existing instrument condition, precision can reach ten thousand/radian.Off-axis angle is controlled, it is possible to make light path be in by calculating
Optimal state.
It should be noted that only give the recording beam path of transmittance determinand in Fig. 1, the device in the present invention is the suitableeest
Recording beam path for reflective objects.Detection light path is joined other any reflection-type object digital holographic recording optical paths,
The function of real-time accurate detection can be completed.
Shown below is the detailed process utilizing the present invention to carry out off-axis angle measurement:
1, maximal off-axis angles degree calculates
In coaxial light path, reference beam coincidence parallel with object beam after No. two bundling devices 5.Keep No. two beam splitters
3, No. two reflecting mirrors 7 and a bundling device 4 are fixed, and the slight oblique angle θ of No. three reflecting mirrors 8 can make No. two bundling devices 5 of entrance
Reference light occur θ angle inclination, be successively reflected into the reference of No. two CCD10 by 8, bundling device 4 of No. three reflecting mirrors
Also there is same cant angle theta in light.Successively reflected the reference light with the transmission of a bundling device 4 with successively by three by No. two reflecting mirrors 7
Produce angle theta between the reference light of number reflecting mirror 8 and bundling device 4 reflection, the chip of No. two CCD10 occurs significantly
Interference fringe.The straight fringe spacing of the interference figure that No. two CCD10 capture is:
D=λ/[2sin (θ/2)] (1)
In formula, λ is optical maser wavelength.Fringe-width can add divided by striped sum with the chip size of No. two CCD10
To calculate.Generally, angle of inclination is the least.Especially to digital hologram, its off-axis angle typically at about 2 degree, can be counted
Calculate width of fringe and be about 29 wavelength.If optical maser wavelength is 0.532 micron, the chip size of No. two CCD10 is 0.5 li
Rice, then have hundreds of stripe.Can use and interferogram is carried out Fourier transform, find fringe frequency respective coordinates, it is thus achieved that bar
The method of stricture of vagina spacing calculates width of fringe d.After calculating fringe spacing d, i.e. can get off-axis angle:
θ=2arcsin [λ/(2d)] (2)
Fringe spacing during record is at least the twice of Pixel Dimensions Δ l, it may be assumed that
θ=2arcsin [λ/(and 4 Δ l)] (3)
If Δ l takes 6 microns, wavelength takes 0.532 micron, can calculate maximal off-axis angles degree and be about 2.5 degree.
When only one of which striped on recording surface, the size of No. two CCD10 chips is 1 centimetre, can obtain off-axis angle and be
0.00005 radian or 3/1000ths degree.
By above-mentioned result of calculation it can be seen that in the present invention precision of recording equipment can reach ten thousand/radian.
2, minimal off-axis angle degree calculates
In off-axis gaussian beam, it is possible to the smallest record angle making original picture separate by recording laser wavelength and records object
Resolution determines, has a relational expression:
θmin=arcsin (3 λ/Δ x) (4)
In formula, λ is recording laser wavelength, and Δ x is the resolution of object, the minimum dimension that can differentiate.
The resolution assuming object is 50 microns, and optical maser wavelength is 0.532 micron, can calculate minimal off-axis angle degree and be
1.8 degree.Raising along with object resolution, it is desirable to minimal off-axis angle degree becomes big.
When calculating angle, the angle of calculated level and vertical direction can be distinguished as required, further according to direction in space
Between relation carry out converting and obtain total off-axis angle.
When carrying out coaxial digital holography record if, with this device there is small off-axis angle in reference light and object beam, extensive
Multiple original light exists for error.The interference fringe data recording No. two CCD10 process after obtaining inclination angle value and obtain
The spatial frequency of the fringe distribution of both direction, the wavefront correction formula substituting into the recovery object light on a CCD9 recording surface just may be used
Automatically to eliminate the error that this off-axis angle causes.The similar example being operated in below is described and confirms.
3, off-axis angle monitoring example
In order to verify this device monitoring method to off-axis angle, the present invention uses above-mentioned digital hologram recording beam path to enter
Go the experiments of measuring of off-axis angle.In No. two CCD10, the corner dimension of the two bundle plane waves that the interferogram of record is corresponding is with complete
In breath experiment light path, off-axis angle is identical, i.e. can represent holographic dry with the interference fringe information that No. two CCD10 collect
Relate to the off-axis angle in light path.
Closing a shutter 14, open No. two shutters 15, off-axis angle measurement part is started working.By No. two CCD10 notes
The interferogram of record optical path, result is as shown in Figure 2.Open a shutter 14, close No. two shutters 15, a CCD9 record ginseng
Examine holographic interference pattern when light does not tilts, import computer 11.Turn off a shutter 14, open No. two shutters 15, finely tune three
Number reflecting mirror 8 horizontal adjustment screw below, makes to occur on the recording surface of No. two CCD10 interference fringe, imports and calculate after record
Machine 11, result is shown in as shown in Figure 3.Open a shutter 14 again, close No. two shutters 15, when a CCD9 record reference light tilts
Holographic interference pattern, import computer 11.It is hardly visible interference fringe in fig. 2, because two beam interferometer light are in parallel common
Spindle Status, interference fringe is the widest.Obviously, Fig. 3 occurs in that a lot of interference fringe, be that two bundles are dry due to light beam run-off the straight
Relating to light and have small angle, interference fringe narrows.Consider the inclination in horizontal direction, need the striped on eye-level direction
Number, has 16.5.Consider the inclination on vertical direction, it was observed that the fringe number on vertical direction, have 6.5.By formula
(2) can calculate horizontal direction off-axis angle is 0.001 radian, and off-axis angle is equivalent to about 0.06 degree；Vertical direction is off-axis
Angle is 0.0005 radian, and off-axis angle is equivalent to about 0.03 degree.
Being contrasted from Fig. 2 and Fig. 3, when reference light does not tilts, the image that No. two CCD10 collect is uniform light spots,
There is no obvious vertical bar stricture of vagina, need patience to debug in actual experiment, until screen does not has striped.When reference light relative to
When object light has small skew, No. two CCD10 there will be striped, and the change along with angle of inclination is big, striped becomes increasingly
Intensive until invisible striped, need carefully to distinguish the both of these case of invisible striped.Fringe inclination situation from Fig. 3 is just
The angle of inclination of reference light can be calculated, it is provided that be corrected to correcting algorithm.
The slight inclination of the broad sense phase-shifted digital holographic technique observation correction reference light that experiment employing is coaxial is off-axis.
In order to check the accuracy of this measuring method, application reference light tilt detection in phase-shifted digital holographic technique example
Method, recovers the result that obtains of object light updating formula to being brought into by the off-axis angle that this off-axis angle measuring method obtains and does not inclines
The result that time tiltedly, object light is rebuild is compared checking.
Experiment uses the spherical light wave somewhat dissipated as Object light wave, in experiment light path in FIG, use No. one soon
Influencing each other between door 14 and No. two shutter 15 isolation detection light paths and holographic recording optical path.
The image collected on the recording surface at a CCD9 place in two kinds of situation, is respectively when reference light tilts with non-
Object light and two width interferograms of reference light during inclination, respectively as shown in Fig. 4, Fig. 5 and Fig. 8, Fig. 9.
In the holographic two step retrieving algorithms of broad sense phase-shifted digital, the extraction of phase-shift value needs to extract from two width holograies,
A number CCD9 records two width holograies (Fig. 4 and Fig. 5).The phase-shift value extracted in two step retrieving algorithms between two width holograies is
0.9241rad, there is bigger skew, as shown in Figure 6 in the phase diagram of object light of reducing in the case of tilt reference light is uncorrected.
In order to more clearly show the detailed information of phase diagram, when recovering the phase diagram in Fig. 6, we are the 1390 of CCD recording surface
× 1024 pixel zero padding are charged to 1990 × 1990 pixels.Substantially can be seen that the annulus of wherein phase diagram is not at the center of figure.
From above-mentioned Fig. 6, when reference light run-off the straight, not only the hologram that a CCD9 collects can be caused by mistake
Difference, this error can cause, always with object light process of reconstruction, the phase twist going back preimage relative to original image.Use reference light inclines
Tiltedly correcting algorithm can solve this problem.
Obtaining inclination angle horizontal direction 0.06 degree, after vertical direction 0.03 degree, by tilt reference light correcting algorithm, just
Going back original image after can being corrected, when reference light is tilted by the present invention, before correction, after image, correction, image is not with reference light
Reduzate light phase during inclination is put together and is compared, it appeared that correcting algorithm can well be corrected because reference light tilts to make
The reduzate light phase distortion become.
Two width interferograms when Fig. 7 and Fig. 8, Fig. 9, Figure 10 are not have run-off the straight respectively, the phase place of recovery, recover when tilting
Phase diagram after object light correction.By the PHASE DISTRIBUTION in Fig. 6 and Fig. 9, the central annulus of tilt reference photo-reduction image
There occurs significantly skew when not tilting, reference light utilizes correcting algorithm can effectively eliminate reduction object light at this when tilting
The error of aspect, shows as off-centered annulus in Fig. 6 in the drawings and is corrected to the central authorities of Figure 10, PHASE DISTRIBUTION Figure 10 and figure
9 is basically identical.During due to oblique incidence, the object light range of information that CCD receives diminishes, so bar in phase place Figure 10 after Jiao Zheng
Stricture of vagina scope can reduce naturally.Visible, the off-axis angle measured in experiment is correct, in theory precision can reach ten thousand/
One radian.
Light path design in the present invention uses the interference of two bundle reference light plane waves, and interferogram is equidistantly distribution
Vertical bar stricture of vagina, not only improves counting fringe number to measure angle, is also beneficial to interferogram is carried out spectrum analysis.
Method certainty of measurement in the present invention is the highest, and the maximal off-axis angles degree of measurement is limited by No. two CCD10 resolution
System.According to formula (2), if Δ l takes 5 microns, optical maser wavelength takes 0.532 micron, can calculate maximal off-axis angles degree and be about 3
Degree.Improve the resolution of No. two CCD10, it is possible to measurement scope is greatly improved.If two CCD have identical resolution, then
Can be used to detect the off-axis angle of digital hologram completely.Due to the diffraction of object light, diffraction object light and reference interference of light
The fringe density of figure can be more than the interferogram fringe density of two bundle reference lighies.Off-axis angle reaches No. two CCD10 cannot differentiate bar
During stricture of vagina, a CCD9 can not record hologram already.
Certainly, only presently preferred embodiments of the present invention described above, the present invention is not limited to enumerate above-described embodiment, should
When explanation, any those of ordinary skill in the art under the teaching of this specification, made all equivalent substitute, bright
Aobvious variant, within all falling within the essential scope of this specification, ought to be protected by the present invention.
Claims (7)
1. an off-axis angle real-time accurate adjustable digital hologram recording equipment, it is characterised in that include LASER Light Source, No. one
Beam splitter, No. two beam splitters, bundling device, No. two bundling devices, reflecting mirror, No. two reflecting mirrors, No. three reflecting mirrors, No. one
Space filtering beam-expanding collimation system, No. two space filtering beam-expanding collimation systems, a CCD, No. two CCD and computer；Wherein, base
Be used for holographic interference record a No. one is formed in a beam splitter, No. two bundling devices, a reflecting mirror and No. three reflecting mirrors
Rectangle optical interference circuit；Form one be used for monitoring based on No. two beam splitters, a bundling device, No. two reflecting mirrors and No. three reflecting mirrors
No. two rectangle optical interference circuits at reference light angle of inclination；The trend of a number rectangle optical interference circuit is: the laser that LASER Light Source sends
Bundle is divided into two bundles after a beam splitter, and wherein, the light beam after a beam splitter transmission reflects through a reflecting mirror
Become object light illumination light with after a space filtering beam-expanding collimation system, this road plane wave illumination to object is formed derivative
Light, arrives on the memorization COMS clip of a CCD, after fresnel diffraction and No. two bundling device reflections after a beam splitter reflection
Light beam become reference light, reference light after No. two space filtering beam-expanding collimation systems transmitted through No. two beam splitters, so
Reflected by No. three reflecting mirrors afterwards, more successively transmitted through a bundling device and No. two bundling devices, be finally radiated at the record of a CCD
On chip；The trend of No. two rectangle optical interference circuits is: reference light after No. two space filtering beam-expanding collimation systems transmitted through two
Number beam splitter, then sequentially pass through No. three reflecting mirrors and a bundling device reflection, finally it is radiated on the memorization COMS clip of No. two CCD；
Through the reference light of No. two beam splitter reflections, then through No. two reflecting mirror reflections and the note of bundling device transmission No. two CCD of arrival
On recording chip；A rectangle optical interference circuit and No. two rectangle optical interference circuits are respectively provided with the corresponding rectangle of control and interfere light
Road is in work or a shutter of halted state and No. two shutters；Rear side at No. three reflecting mirrors is provided with set screw, is used for
Adjust pitching or the level angle of described No. three reflecting mirrors；A number CCD and No. two CCD is connected with computer respectively.
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment the most according to claim 1, its feature exists
In, a shutter is between a bundling device and No. two bundling devices；No. two shutters are positioned at No. two beam splitters and No. two reflecting mirrors
Between.
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment the most according to claim 1, its feature exists
In, when a shutter is opened and during No. two shutter closes, and only No. one rectangle optical interference circuit is in running order；When No. two shutters
Opening and during a shutter close, only No. two rectangle optical interference circuits are in running order.
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment the most according to claim 1, its feature exists
In, arrive the laser beam on No. two CCD memorization COMS clip and through No. three reflections through No. two beam splitters and No. two reflecting mirror reflections
Mirror and a bundling device reflection arrive the laser beam on No. two CCD memorization COMS clip and interfere formation detection interference fringe.
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment the most according to claim 1, its feature exists
In, before digital hologram recording equipment uses, adjust a rectangle optical interference circuit and No. two rectangle optical interference circuits are in parallel common
Spindle Status.
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment the most according to claim 1, its feature exists
In, described set screw includes horizontal adjustment screw and vertical set screw.
A kind of off-axis angle real-time accurate adjustable digital hologram recording equipment the most according to claim 1, its feature exists
In, a described CCD and No. two CCD has identical resolution.
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| CN107144233A (en) * | 2017-04-11 | 2017-09-08 | 北京航空航天大学 | The three dimensional shape measurement system that a kind of projected grating phase is combined with digital hologram |
| CN107463081A (en) * | 2017-06-16 | 2017-12-12 | 重庆理工大学 | A kind of real-time micro-imaging detecting system of three-dimensional using Digital Holography |
| CN107688284A (en) * | 2017-08-29 | 2018-02-13 | 西北核技术研究所 | A kind of Particle Field is holographic coaxially and off axis to reproduce light path system and method |
| CN109116709A (en) * | 2018-08-14 | 2019-01-01 | 中国石油大学(华东) | The weak off-axis phase-shifted digital holography phase-shift value of one kind extracts and object light restoration methods |
| CN114459342A (en) * | 2022-01-25 | 2022-05-10 | 华南师范大学 | Coaxial and off-axis digital holographic switching device based on parallel beam splitting prism |
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| CN114459342A (en) * | 2022-01-25 | 2022-05-10 | 华南师范大学 | Coaxial and off-axis digital holographic switching device based on parallel beam splitting prism |
| CN114459342B (en) * | 2022-01-25 | 2023-07-04 | 华南师范大学 | On-axis and off-axis digital holographic switching device based on parallel beam splitting prism |
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