CN102231055B - Tricolor recording layered reproduced dynamic hologram recording device - Google Patents
Tricolor recording layered reproduced dynamic hologram recording device Download PDFInfo
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Abstract
The invention relates to a tricolor recording layered reproduced dynamic hologram recording device. The device is composed of three lasers, three beam expanding components, three Fresnel biprisms, a colour CCD (charge coupled device) camera and a computer. When the lights emitted by the three lasers respectively pass through the beam expanding components, part of the lights pass through an object to be measured and interferes with the object under the action of the Fresnel biprisms, and then the formed information can be recorded by the CCD camera; and finally, the computer can work out the dynamic information of the outline and internal structure of the object to be measured through a tomography algorithm. The recording device is a three-direction multi-frequency light coaxial digital hologram recording system and can respectively record the hologram information from different directions simultaneously; and meanwhile, the recording device can be used for realizing the dynamic deformation detection on the outline and internal fine structure of a transparent object or a projector object by adopting the tomography algorithm.
Description
Technical field
The present invention relates to a kind of hologram recorder; Particularly the dynamic hologram pen recorder is reproduced in the layering of three looks record; In this device the light of three kinds of different frequencies respectively from the space three directions pass through object; Formed three groups of holographic signals are simultaneously by the colored CCD record, and utilize the method for colo(u)r breakup to realize the separation of three tunnel information.
Background technology
The present invention relates to a kind of digital hologram chromatographic technique, be collection Digital Holography and two kinds of technical characterstics of optical tomography, be used for technical method transparent or transmissive object tomography.Realize that based on this technology the pacing items that object information is rebuild is, obtains to throw from different directions the holographic information of object.In order to measure dynamic object, need write down the holographic interference information of the projection of different directions simultaneously.Two class methods are arranged at present, the one, adopt a plurality of CCD image data, the information of a projecting direction of each CCD record.The shortcoming of this method is that parameter matching and the adjustment between each road is not easy to realize; Another is to adopt single CCD record thing information, but for the frequency spectrum that in follow-up signal is handled, carries out multiline message separates, pen recorder is just very complicated, for system parameter calibration and the adjustment of measurement state are brought very big inconvenience.Comparatively speaking; Adopt the method practicality of single CCD stronger; But really become practical technique, the problem that need to solve is: when adopting single CCD to carry out multichannel (Ru Sanlu) signal when writing down simultaneously, how to guarantee that multiline message can realize under the condition of separation in subsequent treatment; Reduce the complicacy of pen recorder, thereby satisfy the dynamic and the practicality of measuring method.
For achieving the above object, in this device the light of three kinds of different frequencies respectively from the space three directions through object, formed three groups of holographic signals simultaneously by a colored CCD record, and utilize the method for colo(u)r breakup to realize the separation of three tunnel information.Wherein each road all utilize the dichroism of Fresnel biprism and the light beam that divided between intersecting angle, just realized beam split and interfered two functions through a branch of light.This characteristic feature of an invention: the information of (1) three direction is by single CCD record simultaneously, and the shortcoming when having overcome a plurality of CCD record has realized the dynamic of pen recorder; (2) separate according to the color difference of three tunnel information, realized effective separation of three tunnel information; (3) in each light path, adopted the single beam interference mode of light path altogether, from the shaft type record mode, required device is few, device is simple, stablize than general.Based on these characteristics of apparatus of the present invention, solved the device dynamic in the hologram record and the problem of complicacy in the present digital hologram chromatographic technique, have novelty.
Summary of the invention
The purpose of apparatus of the present invention is the defective to the prior art existence; Provide the layering of a kind of three looks record to reproduce the dynamic hologram pen recorder; Digital Holography and two kinds of technology of optical tomography are combined; Utilize both advantages, provide a kind of transparent or transmissive object are carried out holographic recording, rebuild the profile of object and the real-time dynamic information of inner structure through the chromatography algorithm then.
For achieving the above object and to the requirement of IMAQ, the present invention's design is:
The laser of (one) three frequency is respectively through expanding bundle irradiation transparent substance or transmissive object; (2) each beam optical path through object produces interference pattern under the Fresnel biprism effect; (3) the three beams light path accumulates a beam optical path; (4) also conversion transforms electric signal with light signal through photoelectricity to collect interference pattern; (5) utilize frequency that the different colours signal is carried out separation and Extraction; (6) Computer Processing signal and carry out structural remodeling obtains the tomographic map of testee.
Conceive according to foregoing invention; The present invention adopts following technical proposals: the pen recorder of dynamic hologram is reproduced in the layering of a kind of three looks record, is made up of red, green, blue three laser instruments, three beam expander assemblies, three Fresnel biprisms, four plane mirrors, two dichroic mirrors, a colourful CCD video camera.It is characterized in that: three direction light beams respectively by the light beam that sends by the red, green, blue laser instrument behind the beam expander assembly; The light transmission object of optical axis one side in each beam optical path wherein; Divide to interfere after the wavefront through Fresnel biprism to form interference pattern, the invalid light beam plate that is blocked blocks.Accumulate one road light beam through plane mirror and first, second two dichroic mirrors then, ccd video camera receives through the interference pattern behind the object; Data collecting card is a digital signal with this conversion of signals, carries out image chromatography algorithm by computing machine again and image realize is rebuild.Three beam expander assemblies and three Fresnel biprisms are distributed in respectively on orthohexagonal six limits on plane in space in the said three direction light paths; Three Fresnel biprisms are placed on three adjacent limits of this hexagon; Three spatial filters are placed on three other adjacent edges, relative Fresnel biprism and spatial filter and between negative lens constitute the wherein guide device of a beam optical path.Wherein the beam expander assembly of each light beam is identical with the Fresnel biprism distance; Ruddiness light path and blue light paths with respect to the green glow light path become symmetry and and the green glow light path between angle be 60 degree; It is on the circumference in the center of circle that each identity unit position, road of while need be placed on the O point, and the O point is the intersection point of three beams light path light axis.
In the above-mentioned digital hologram pen recorder; Described testee has certain requirement according to the principle of Fresnel biprism to placement location; Object should be placed between negative lens and the Fresnel biprism and in the overlay region of three beams optical axis one side, guarantee wavefront through testee after beam splitting the still complete while by three beams light path record.
In the above-mentioned digital hologram pen recorder, the structural requirement of described Fresnel biprism is, the size requirements of its drift angle is introduced the proper carrier wave frequency in gatherer process, and guaranteeing to reproduce in the hologram of gathering object wave can separate from zero level and conjugate image.
In the above-mentioned digital hologram pen recorder; The requirement of described first, second dichroic mirror is; First dichroic mirror (10) is the anti-green red light microscopic (anti-532nm passes through 650nm) that closes, and second dichroic mirror (11) is the anti-indigo plant red light microscopic (anti-473nm passes through 532nm and passes through 650nm) that closes that reveals the green.
In the above-mentioned digital hologram pen recorder, described ccd video camera needs to confirm it according to the requirements such as frequency information of adopting laser instrument and gathers used resolution, and simultaneously described ccd video camera connects the computing machine that image pick-up card is housed.
In the above-mentioned digital hologram pen recorder, the carrier frequency of hologram relies on Amici prism to carry out, and needs the tester that measuring principle is had certain understanding.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and obvious improvement: the present invention only has three laser instruments, three beam expander assemblies, three Fresnel biprisms, a colourful CCD video camera and a formation such as computing machine.The present invention is a kind of digital hologram chart recording system of three direction multi frequency optical coaxial-types; Can distinguish the hologram information that writes down different directions simultaneously; Through adopting the chromatography algorithm, realize the dynamic deformation of transparent substance or transmissive thing profile and interior detail microstructure is detected.
Description of drawings
Fig. 1 is the structured flowchart of one embodiment of the invention.
Fig. 2 is the structural representation of Fig. 1 example.
Fig. 3 is wherein any a branch of index path among Fig. 2.
Fig. 4 is a concrete light path Parameter Map among Fig. 3.
Fig. 5 is digital hologram digital reproduction procedure figure.
Embodiment
A preferential embodiment of the present invention combines detailed description of the drawings following: referring to Fig. 2, the layering of three looks shown in Figure 2 record is reproduced the dynamic holographic pen recorder and is made up of 4,5, four plane mirrors of 1,2,3, three beam expander assemblies of three laser instruments, three Fresnel biprisms 7, two 10,11, colourful CCD video cameras 12 of dichroic mirror and computing machine 13.4,5 and three Fresnel biprisms 7 of three beam expander assemblies in the three beams light path are distributed on orthohexagonal six limits of space plane; Three Fresnel biprisms 7 are placed on three adjacent limits of this hexagon; Three beam expander assemblies 4,5 are placed on three other adjacent edges of this hexagon, and a relative Fresnel biprism 7 and spatial filter 4 and negative lens 5 constitute the guide device of a beam optical path; Wherein the beam expander assembly 4,5 of each light beam is identical with Fresnel biprism 7 distances; Ruddiness light path and blue light paths with respect to the green glow light path become symmetry and and the green glow light path between angle be 60 degree; It is on the circumference in the center of circle that each identity unit position, road of while need be placed on the O point, and the O point is the intersection point of three beams light path light axis; The light beam that three direction light beams are sent by red, green, blue laser instrument 1,2,3 respectively is behind beam expander assembly 4,5; The light transmission object 6 of optical axis one side in each beam optical path wherein; Form interference pattern through interfering after 7 fens wavefront of Fresnel biprism, invalid light beam 8 of the plates that are blocked block; Accumulate one road light beam through plane mirror 9 and first, second two dichroic mirrors 10,11 then; Ccd video camera 12 receives through the interference pattern behind the object; Be connected to computing machine 13, have computing machine 13 to carry out signal Processing and structural remodeling, to obtain the tomographic map of testee.Wherein three laser instruments are respectively red laser 1, green laser 2 and blue laser 3; The beam expander assembly is made up of spatial filter 4 and negative lens 5, can regulate the subtended angle of light beam through both position relations; Fresnel biprism has realized that beam split and two functions of carrier wave write down the phase information of object.
Principle of work is following: the concrete job step of this device is: three direction light beams expand bundle through spatial filter 4 backs respectively by the light beam that red, green, blue laser instrument 1,2,3 sends respectively behind negative lens 5; The light transmission object 6 of optical axis one side in each beam optical path wherein; Form interference pattern through interfering after 7 fens wavefront of Fresnel biprism, invalid light beam 8 of the plates that are blocked block.Under the effect of level crossing 9 and dichroic mirror 10,11, converge and project on the ccd video camera 12,, draw final object structures through computer fitting afterwards and change through on the data collecting card data transmission to computing machine 13 being extracted the information of each frequencies.
As shown in Figure 2; The laser of three frequencies is respectively through expanding bundle and irradiation transparent substance or transmissive object 6; Each beam optical path of back produces interference pattern under Fresnel biprism 7 effects; Under the effect of level crossing 9 and dichroic mirror 10,11, the three beams light path is accumulated a beam optical path, gathered by ccd video camera 12.
As shown in Figure 2, the spatial filter 4 of each light beam in the described total system three direction light paths, negative lens 5 are identical with Fresnel biprism 7 distances, ruddiness light path place device and blue light paths place device about green glow light path symmetry and between angle be 60 degree; It is on the circumference in the center of circle that each road identity unit spatial filter 4 of while, negative lens 5, Fresnel biprism 7 positions need be placed on the O point, and the O point is the intersection point of three beams light path light axis; Wherein spatial filter 4 in the beam expander assembly and the distance between the negative lens 5 are confirmed by the single beam road, specifically see formula 1.
As shown in Figure 4; The light beam that red, green, blue laser instrument 1,2,3 sends focuses on the S point through behind the spatial filter 4; Because 5 pairs of light beams of negative lens have disperse function; So through negative lens () back beam convergence point be S ', promptly can regard process S ' as and put and send through the light beam behind the negative lens 5.For a beam optical path, establish the beam convergence point S of spatial filter (4) and the distance between the negative lens 5 and do
-l, the focal length of negative lens 5 does
F ', then theoretical according to optical imagery, the distance between virtual image point S ' and the negative lens 5
For:
Like Fig. 4, investigate a branch of overlay region (zone that promptly receives), and the angle of establishing Fresnel biprism 7 is that the refractive index of prism does by ccd video camera 12 through Fresnel biprism 7 back two-beams
n, the subtended angle of the light beam of corresponding overlay region then
For:
The subtended angle of corresponding red laser beam, green laser beam and blue laser beam is respectively
,
,
, and formula is the same.Because the focal length of negative lens (5) is certain; Then
,
for different light beams is identical, then
=
=
.
Shown in Fig. 3 and 4, the distance of establishing between negative lens 5 and Fresnel biprism 7 bottom surfaces does
p, the distance between Fresnel biprism 7 bottom surfaces and the CCD receiving plane does
q, interference region width then, promptly the CCD scope that should receive is:
Corresponding three kinds of light beams of red, green, blue are because the focal length of negative lens 5
, the distance between light beam subtended angle and negative lens 5 and Fresnel biprism 7 bottom surfaces
pIdentical, corresponding different colours light beam
MBe worth also identical, thereby the CCD of three-beam to accept scope identical.
As shown in Figure 2, this device only has the data for projection of three directions, thus the reproduction process we adopt algebraically iterative algorithm reconstruction model final the structure PHASE DISTRIBUTION.If the individual layer original image that needs to rebuild is turned to by discrete
N=n * nThe one-dimension array that individual pixel is formed
, projection ray adds up to
M=3, then image
iThe projection of bar ray can be represented as follows:
In the formula,
Be
iThe projection value of bar ray is the projection value of red, green, blue three looks,
Be weighting factor, expression the (
I, j) individual pixel is to
iThe contribution of bar ray projection value,
Be (
I, j) projection value of individual pixel.(5) in the formula
Be given value, weighting factor
For from assignment,
Be projection value to be found the solution. for obtaining
, right
(
I=1,2,3) system of equations adopts the algebraically process of iteration to carry out iterative. iterative equation is following:
In the formula
tBe iterations,
ζBe relaxation factor,
ζDemarcating the back value according to experiment condition. substitution
Projection value and given initial value
(generally choose
=0) just can carry out interative computation. iteration finishes when satisfying following condition:
?(
i=1,2,3…,n) (7)
At this moment;
is required reconstructed image. for this device; Hologram numerical reconstruction Wave-front phase information is
value, and the data message of gathering is carried out the complete structure that tomographic reconstruction respectively can obtain the inside of testee.
Claims (5)
1. the dynamic hologram pen recorder is reproduced in look record layering; By red, green, blue three laser instruments (1,2,3), form by three spatial filters (4) and three beam expander assemblies (4,5), three Fresnel biprisms (7), three shadow shields (8), two dichroic mirrors (10), four plane mirrors (9), a colourful CCD video camera (12) of three negative lenses (5) formation; It is characterized in that on orthohexagonal six limits that three beam expander assemblies (4,5) and three Fresnel biprisms (7) in the three beams light path are distributed in space plane; Three Fresnel biprisms (7) are placed on three adjacent limits of this hexagon; Three beam expander assemblies (4,5) are placed on three other adjacent edges of this hexagon, and a relative Fresnel biprism (7) and a spatial filter (4) and a negative lens (5) constitute the guide device of a beam optical path; Wherein the beam expander assembly of each light beam (4,5) is identical with Fresnel biprism (7) distance; Ruddiness light path and blue light paths with respect to the green glow light path become symmetry and and the green glow light path between angle be 60 degree; It is on the circumference in the center of circle that each identity unit position, road of while need be placed on the O point, and the O point is the intersection point of three beams light path light axis; The light beam that three direction light beams are sent by red, green, blue laser instrument (1,2,3) respectively is behind beam expander assembly (4,5); The light transmission object (6) of optical axis one side in each beam optical path wherein; Divide to interfere after the wavefront through Fresnel biprism (7) to form interference pattern, the invalid light beam plate (8) that is blocked blocks; Pass through plane mirror (9) then and first, second two dichroic mirrors (10,11) accumulate one road light beam; Ccd video camera (12) receives through the interference pattern behind the object; Be connected to computing machine (13); Carry out signal Processing and structural remodeling by computing machine (13), to obtain the tomographic map of testee.
2. the dynamic hologram pen recorder is reproduced in 1 described three looks record layering according to claim, it is characterized in that the stationkeeping of said spatial filter (4) and negative lens (5), and the light beam that obtains simultaneously is enough to shine the whole of testee (6); The effect of catoptron (9) is to change beam direction that three-beam is concentrated on is a branch of.
3. the dynamic hologram pen recorder is reproduced in 1 described three looks record layering according to claim; It is characterized in that described testee (6) is transparent substance or transmissive object; Be placed between negative lens (5) and the Fresnel biprism (7), and in the overlay region of three beams optical axis one side.
4. the dynamic hologram pen recorder is reproduced in 1 described three looks record layering according to claim, it is characterized in that described Fresnel biprism (7) refractive index does
n, its drift angle size need be chosen according to testee size, carrier frequency.
5. the dynamic hologram pen recorder is reproduced in layering according to the described three looks record of claim 1, it is characterized in that said first dichroic mirror (10) is the anti-green red light microscopic that closes, and second dichroic mirror (11) is the anti-indigo plant red light microscopic that closes that reveals the green.
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| CN102506755B (en) * | 2011-11-15 | 2014-07-30 | 上海大学 | Digital holographic tomography image recording device based on directional frequency spectrum separation |
| CN105676614B (en) * | 2016-03-19 | 2019-04-02 | 上海大学 | Three visual angle single holographic figure multiple-beam synthesis record system |
| CN107422625B (en) * | 2017-06-29 | 2020-01-10 | 厦门理工学院 | Method for making computer-made color rainbow hologram |
| CN114755905B (en) * | 2022-04-07 | 2023-11-07 | 浙江师范大学 | High-resolution true color image projection display system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2222696A (en) * | 1988-07-09 | 1990-03-14 | Exitech Ltd | Holographic diffraction gratings |
| US6330088B1 (en) * | 1998-02-27 | 2001-12-11 | Zebra Imaging, Inc. | Method and apparatus for recording one-step, full-color, full-parallax, holographic stereograms |
| CN1356603A (en) * | 2001-12-29 | 2002-07-03 | 青岛海洋大学 | Method for generating synthetic hologram by digital microreflector |
| CN101566823A (en) * | 2009-06-05 | 2009-10-28 | 上海大学 | Method and device for true color 3D object holographic display |
| EP2024793B1 (en) * | 2006-05-23 | 2009-12-02 | SeeReal Technologies S.A. | Method and device for rendering and generating computer-generated video holograms |
-
2011
- 2011-06-30 CN CN2011101806789A patent/CN102231055B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2222696A (en) * | 1988-07-09 | 1990-03-14 | Exitech Ltd | Holographic diffraction gratings |
| US6330088B1 (en) * | 1998-02-27 | 2001-12-11 | Zebra Imaging, Inc. | Method and apparatus for recording one-step, full-color, full-parallax, holographic stereograms |
| CN1356603A (en) * | 2001-12-29 | 2002-07-03 | 青岛海洋大学 | Method for generating synthetic hologram by digital microreflector |
| EP2024793B1 (en) * | 2006-05-23 | 2009-12-02 | SeeReal Technologies S.A. | Method and device for rendering and generating computer-generated video holograms |
| CN101566823A (en) * | 2009-06-05 | 2009-10-28 | 上海大学 | Method and device for true color 3D object holographic display |
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