CN102122513B - Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism - Google Patents
Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism Download PDFInfo
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- CN102122513B CN102122513B CN2011100731836A CN201110073183A CN102122513B CN 102122513 B CN102122513 B CN 102122513B CN 2011100731836 A CN2011100731836 A CN 2011100731836A CN 201110073183 A CN201110073183 A CN 201110073183A CN 102122513 B CN102122513 B CN 102122513B
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Abstract
The invention relates to a coaxial digital holographic measuring device for a transparent substance based on the beam-splitting property of a Fresnel biprism. The measuring device consists of a laser, a beam expander, a transparent object to be measured, a Fresnel biprism, a CCD (charge coupled device) camera and the like. In the invention, after light sent by the laser is expanded, one part of the light is projected on the Fresnel biprism through the object to be measured and then is split into two beams which form an included angle, and interference information between the two beams is recorded by the CCD camera; and meanwhile one coherent beam of the two beams passes through the object to be measured, thus forming a hologram carried with object information. The device has the advantages of fewer components, simple structure and good portability; and the recording device can be applied to testing structural and state parameters of the transparent substances such as a transparent medium, a living cell and the like.
Description
Technical field
The present invention relates to a kind of coaxial-type transparency material digital hologram pen recorder based on the Fresnel biprism beam split, being mainly used in and measuring transparent substance is pure phase object, like the structure and the state parameter of active somatic cell, optical fiber, small slide etc., like distortion etc.
Background technology
Digital Holography is the important measuring technique that developed recently gets up, and has obtained plurality of applications at contour of object and state parameter etc.The recording mode of employing can be divided into two kinds, and a kind of is the coaxial recording mode, and advantage is only to need a branch of light, and device constitutes often simple, but digital hologram reproduction algorithm is complicated, simultaneously recording medium is had certain requirement, and is more high like transparency; Using more is from the axle recording mode, and when advantage was the digital hologram reproduction, object wave information easy separation was reproduced algorithm and realized easily.Shortcoming is to adopt the structure of branch light path formula, and light path constitutes often complicated, needs a plurality of optical device, and adjustment is had higher requirement, and the influence of being vibrated is also bigger.
The present invention attempts to invent a kind of pen recorder, realizes coaxial manner recording off-axis hologram, makes when the hologram digital reproduction, can adopt general off-axis hologram to reproduce algorithm, improves the anti-interference of system, easy modulability and portability.
In document " Transmission digital holographic microscopy based on a beam-splitter cube interferometer ", propose Amici prism of a kind of employing, and adopted the method that realizes the single beam coaxial recording basically along light splitting surface incident.This method has realized single beam recording off-axis hologram, but the carrier frequency of hologram relies on Amici prism to carry out, and needs the tester that measuring principle is had certain understanding, guarantees that the state of instrument meets test request.
Summary of the invention
The purpose of apparatus of the present invention is the defective to the prior art existence; A kind of coaxial-type transparency material digital hologram pen recorder of Fresnel biprism beam split is provided; Utilize the coaxial-type light path to realize the record of off-axis hologram, and can adjust the enlargement ratio of record easily.
For achieving the above object, design of the present invention is:
The present invention utilized the dichroism of Fresnel biprism and the light beam that divided between intersecting angle, realized beam split and introduced two performances of carrier frequency, in test, need not adjust light path to introduce carrier frequency.This pen recorder is made up of laser instrument, beam expander device, Fresnel biprism and CCD device, has following characteristics: the digital hologram chart recording system that is a kind of coaxial-type; Carrier wave is arranged in the interference signal, need in measurement, not adjust light path, help the object wave information separated in the hologram digital reproduction; Adopt a Fresnel biprism just to realize beam split and two functions of carrier wave; Dynamic is good, promptly can realize the measurement of transparent substance three-dimensional structure, can realize deformation detection again; This recording device records be the hologram that no lens type amplifies, be convenient to the enlargement ratio of adjustment record flexibly; The device device is few, simple in structure, and portable performance is good; This pen recorder can be applied to transparency material, like the structure and the state parameter test of transparent medium and active somatic cell etc.
According to the foregoing invention design, the present invention adopts following technical proposals:
A kind of transparency material digital hologram pen recorder based on the Fresnel biprism beam split; Comprise a laser instrument, a beam expander assembly, a Fresnel biprism, a ccd video camera, a shutter and a computing machine; It is characterized in that on the light path of said laser instrument emission light beam said beam expander assembly being set; Settle testee in the light path between said beam expander assembly and Fresnel prism; Said ccd video camera is set on the light path behind the said Fresnel biprism aims at Fresnel biprism, in the ccd video camera periphery shutter is set, said ccd video camera connects computing machine; By the laser instrument emitted light beams behind the beam expander assembly; Part light is through testee; Pass through the Fresnel biprism beam split again; Remaining non-measuring beam plate that is blocked absorbs or blocks, and the overlapping region signal of two-beam is received by ccd video camera, and ccd video camera transfers to computing machine with the image information of gathering.
In the above-mentioned digital hologram pen recorder, described beam expander assembly is provided with a negative lens and constitutes by on the spatial filter back light path catoptron being set after the catoptron.Its spatial filter (2) can obtain a spherical wave, and catoptron (3) plays the effect of beam steering, to save the horizontal overall length size of register system.
In the above-mentioned digital hologram pen recorder, described negative lens (4) can move to obtain the light beam of different diffusions.
In the above-mentioned digital hologram pen recorder; Described testee (5) is placed between negative lens (4) and the Fresnel biprism (6); And institute's test sample originally is that pure phase object is a transparent substance, is placed on system's center line with upper/lower positions, guarantees through the wavefront of sample still complete after beam splitting.
In the above-mentioned digital hologram pen recorder, described ccd video camera (8) can laterally move, to change the enlargement ratio of testee.
In the above-mentioned digital hologram pen recorder, described ccd video camera (8) connects the computing machine (9) that image pick-up card is housed.
In the above-mentioned digital hologram pen recorder; The structural requirement of described Fresnel biprism (6) is; The size requirements of its drift angle is introduced the proper carrier wave frequency in hologram, guarantee that object wave can be separated from zero level and conjugate image in the hologram digital reproduction.
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 a concrete light path Parameter Map among Fig. 2.
Fig. 4 is the interference fringe synoptic diagram that Fig. 3 light path produces.
Fig. 5 is digital hologram digital reproduction procedure figure.
Embodiment
Preferential embodiment of the present invention combines detailed description of the drawings following:
Embodiment one:
Referring to Fig. 1 and Fig. 2; The coaxial-type transparency material digital hologram pen recorder of this Fresnel biprism beam split; Comprise a laser instrument (1), a beam expander assembly (2-4), a Fresnel biprism (6), a ccd video camera (8), a shutter (7) and a computing machine (9); It is characterized in that on the light path of said laser instrument (1) emission light beam said beam expander assembly (2-4) being set; Settle testee (5) in the light path between said beam expander assembly (2-4) and Fresnel prism (6); Said ccd video camera (8) is set on the light path behind the said Fresnel biprism (6) aims at Fresnel biprism (6), in ccd video camera (8) periphery shutter (7) is set, said ccd video camera (8) connects computing machine (9); By the laser instrument emitted light beams behind beam expander assembly (2-4); Part light is through testee (5); Pass through Fresnel biprism (6) beam split again; Remaining non-measuring beam plate (7) that is blocked absorbs or blocks, and the overlapping region signal of two-beam is received by ccd video camera (8), and ccd video camera (8) transfers to computing machine (9) with the image information of gathering.
Embodiment two:
Referring to Fig. 2, present embodiment and embodiment one basic identical special feature are following:
Said beam expander assembly (2-4) is by being provided with a reflective mirror (3) on the light path of a spatial filter (2) back, and catoptron (3) is placed a negative lens (4) afterwards and constituted; Spatial filter (2) and negative lens (4) play the effect of beam expander, and wherein negative lens (4) requires to be installed on the guide rail, and it can be moved along optical axis direction; The effect of catoptron (3) is the horizontal overall length size that the turnover beam direction reduces whole device.
Said testee (5) is a transparent substance, is placed between negative lens (4) and the Fresnel biprism (5), and requires in the spatial beam angle below optical axis.
Said Fresnel biprism (4) refractive index is
; Choosing and need choosing according to testee size, instrument overall dimension, carrier frequency of its drift angle
size is bigger than the drift angle of the Fresnel biprism that adopts in the traditional measurement.
Said ccd video camera (8) installation requirement can move forward and backward along optical axis direction, to change the enlargement ratio of testee.
Embodiment three:
Referring to Fig. 2 and 3; Present embodiment is identical with embodiment two; Its principle of work is following: focus on the S point behind the light beam process spatial filter (2) that laser (1) sends; Because negative lens (4) has disperse function to light beam,, promptly pass through light beam behind the negative lens (4) and can regard process S ' as and put and send so to throw lens (4) back beam convergence point be S ' through negative.Investigate overlay region (zone that promptly receives), and the angle of establishing Fresnel biprism (6) does by CCD gamma camera (8) through Fresnel biprism (6) back two-beam
θ, the refractive index of prism does
n, then the subtended angle of the light beam of corresponding overlay region is:
As shown in Figure 3, establish the beam convergence point S of spatial filter (2) and the distance between the negative lens (4) and do
-l, the focal length of negative lens (4) does
F ', then theoretical according to optical imagery, the distance between virtual image point S ' and the negative lens (4) is:
As shown in Figure 3, the distance of establishing between negative lens (4) and Fresnel biprism (6) bottom surface does
p, the distance between Fresnel biprism (6) bottom surface and the CCD receiving plane does
q, interference region width then, promptly the CCD scope that should receive is:
As shown in Figure 4, be the equivalent light path of this register system, promptly send light and be divided into two-beam through Fresnel biprism from S ' point, can equivalence become from S
1', S
2' light that sends interferes at space overlap.Therefore, testee should be placed in the shadow region among Fig. 4.
As shown in Figure 4, establish equivalent light source point S
1', S
2' between distance do
d, the carrier frequency of then introducing is:
As shown in Figure 4, the distance of establishing between testee (5) and the CCD receiving plane is L, and the size of the receiving plane of CCD equals interference region width M, and the size that then can write down object is:
Like Fig. 2,3, shown in 4, through regulating negative lens (4), adjust the position of S ', thereby reach the purpose of regulating CCD posting field width (being the interference region size) and carrier frequency.
Like Fig. 2,3, shown in 4, through the position of adjusting ccd video camera (8), adjustable range L and D, thus realization can be write down the size and the enlargement ratio of object.
As shown in Figure 5; The digital hologram of gathering is at first carried out Fourier to be changed; From spectrogram, extract the object wave information on record plane; Utilize Fresnel algorithm or convolution algorithm to carry out digital reproduction then, from the original object wave information of the object position of reproducing gained, obtain by the amplitude and the phase information of record object.The computing formula of Fresnel algorithm is:
In the formula;
record plane object wave information for from spectrogram, proposing;
is for reproducing reference light wave;
represents the coordinate on CCD record plane; Planimetric coordinates is reproduced in
representative;
;
is the pixel separation of ccd video camera both direction;
is the distance of testee to CCD record plane, and
is the wavelength of recording light source.
The computing formula of convolution algorithm is:
（12）
The distribution of amplitudes of the original object wave after the reproduction is:
In the formula:
representes signed magnitude arithmetic(al).
In the formula: the phase angle computing is got in
expression.
Claims (2)
1. the coaxial-type transparency material digital hologram pen recorder of a Fresnel biprism beam split; Comprise a laser instrument (1), a beam expander assembly (2-4), a Fresnel biprism (6), a ccd video camera (8), a shutter (7) and a computing machine (9); It is characterized in that; Said beam expander assembly (2-4) is by being provided with a reflective mirror (3) on the light path of a spatial filter (2) back, and catoptron (3) is placed a negative lens (4) afterwards and constituted; Spatial filter (2) and negative lens (4) play the effect of beam expander, and wherein negative lens (4) requires to be installed on the guide rail, and it can be moved along optical axis direction; The effect of catoptron (3) is the horizontal overall length size that the turnover beam direction reduces whole device; On the light path of said laser instrument (1) emission light beam, said beam expander assembly (2-4) is set; Settle testee (5) in the light path between said beam expander assembly (2-4) and Fresnel biprism (6); Said ccd video camera (8) is set on the light path behind the said Fresnel biprism (6) aims at Fresnel biprism (6); In ccd video camera (8) periphery shutter (7) is set, said ccd video camera (8) connects computing machine (9); By the laser instrument emitted light beams behind beam expander assembly (2-4); Part light is through testee (5); Pass through Fresnel biprism (6) beam split again; Remaining non-measuring beam plate (7) that is blocked absorbs or blocks, and the overlapping region signal of two-beam is received by ccd video camera (8), and ccd video camera (8) transfers to computing machine (9) with the image information of gathering;
Said testee (5) is a transparent substance, is placed between negative lens (4) and the Fresnel biprism (5), and requires in the spatial beam angle below optical axis;
Said Fresnel biprism (6) refractive index is
; Choosing and need choosing according to testee size, instrument overall dimension, carrier frequency of its drift angle
size is bigger than the drift angle of the Fresnel biprism that adopts in the traditional measurement.
2. the coaxial-type transparency material digital hologram pen recorder of Fresnel biprism beam split according to claim 1 is characterized in that said ccd video camera (8) installation requirement can move forward and backward along optical axis direction, to change the enlargement ratio of testee.
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| CN2011100731836A CN102122513B (en) | 2011-03-25 | 2011-03-25 | Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism |
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| CN2011100731836A CN102122513B (en) | 2011-03-25 | 2011-03-25 | Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism |
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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 |
| CN106020241B (en) * | 2016-05-30 | 2018-11-30 | 中国科学院光电技术研究所 | Rotary biprism imaging alignment method |
| CN111289225B (en) * | 2020-02-26 | 2022-04-05 | 中国科学院上海光学精密机械研究所 | Device and method for measuring phase characteristics of liquid crystal wave plate under continuous laser loading |
| CN112179762A (en) * | 2020-03-05 | 2021-01-05 | 成都迪泰科技有限公司 | Double prism auxiliary measurement of Young modulus of metal wire |
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| CN101561746A (en) * | 2009-05-26 | 2009-10-21 | 上海大学 | Holographic photoelectric representation virtual image real-time interactive display unit |
| CN101795344A (en) * | 2010-03-02 | 2010-08-04 | 北京大学 | Digital hologram compression method and system, decoding method and system, and transmission method and system |
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| CN101561746A (en) * | 2009-05-26 | 2009-10-21 | 上海大学 | Holographic photoelectric representation virtual image real-time interactive display unit |
| CN101795344A (en) * | 2010-03-02 | 2010-08-04 | 北京大学 | Digital hologram compression method and system, decoding method and system, and transmission method and system |
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