CN202034034U - Large field of view digital hologram recording device - Google Patents
Large field of view digital hologram recording device Download PDFInfo
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- CN202034034U CN202034034U CN2010205993732U CN201020599373U CN202034034U CN 202034034 U CN202034034 U CN 202034034U CN 2010205993732 U CN2010205993732 U CN 2010205993732U CN 201020599373 U CN201020599373 U CN 201020599373U CN 202034034 U CN202034034 U CN 202034034U
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Abstract
The utility model relates to a large field of view digital hologram recording device, comprising an optical path system, a data collector and a computer, wherein the optical path system comprises an LD (laser device), a mirror M2, a BS1 (beam splitter 1), a BS2 ( beam splitter 2), a convex lens L1, a rectangular hole filter SF, a convex lens L2, a BS3 (beam splitter 3) and a two dimensional moving platform P, wherein the BS2, the L1, the SF, the L2, the BS3 and a CCD are arranged in order, and the SF, the L2 and the BS3 are connected on the P. The technology and the device solve the problem that digital reproduction of an object visual angle is restricted by resolution of a recorder. Besides, the technology and the device can be applied to the field of microscopic digital holographic measurement to obtain global information of microscopic objects, realizing an enlarged measuring area in digital holographic.
Description
Technical field
The utility model belongs to digital holography and is applied to face shape checkout equipment, specifically is a kind of big visual field numeral hologram recorder.
Technical background
The characteristics of digital hologram maximum are to carry out quantitative test to the structural information of three-dimensional or phase object, but because the limited pixel count of registering device, make that the high-frequency information of hologram can not be by effective record, thereby the resolution of reconstructed image are limited.Opposite shape is detected, and resolution is corresponding with the visual angle, and the essence of hologram visual angle problem is exactly resolution problem in other words.In addition, because the high frequency hologram is owed sampling or invalid sampling, the signal to noise ratio (S/N ratio) of hologram will be reduced.Increasing effective ways that reproduce visual angle and signal to noise ratio (S/N ratio) is synthetic aperture technology.If will carry out quantitative test to object Shape ' or phase information, must adopt the complex amplitude stacking method, this method requires each to reproduce light field relatively-stationary phase relation, the stability of register system and the displacement accuracy of photoelectronic imaging device there is very high requirement, if any error, the difficulty that numeral revises will be increased.
The utility model content
Another purpose of the present utility model is to provide a kind of pen recorder that adopts spatial frequency spectrum splicing, splicing correction to be easy to look greatly the field boundary digital hologram.
The technical scheme that its technical matters that solves the utility model adopts is: principle is to utilize 4F coherent image disposal system record digital hologram, at the spatial frequency spectrum face movably filtering hole is set, along with moving of aperture, and the subhologram of record different spectral coverage.During reproduction, at first subhologram is carried out digital inverse Fourier transform, the wavelength coverage of reconstruct correspondence, and wavelength coverage is spliced to form complete thing optical spectrum, at last entire spectrum is carried out Fourier transform once more, thereby realize the reconstruct of picture, concrete formation comprises: light path system, data acquisition unit and computing machine three parts, light path system is by laser instrument LD, mirror M 2, beam splitter BS1, beam splitter BS2, convex lens L1, rectangular opening wave filter SF, convex lens L2, beam splitter BS3, two dimension mobile platform P constitutes, beam splitter BS2, convex lens L1, rectangular opening wave filter SF, convex lens L2, beam splitter BS3, photoelectric commutator CCD is arranged in order setting, rectangular opening wave filter SF, convex lens L2, beam splitter BS3 is connected on the two-dimentional mobile platform P; Two dimension mobile platform P by platen P1, be connected vertical direction elevating mechanism on the platen P1, be connected the platen P2 on the elevating mechanism and be connected platen P2 and go up that horizontal direction travel mechanism forms; And horizontal direction travel mechanism and vertical direction travel mechanism are made up of support and shell, feed screw nut, screw mandrel, hinged-support, motor, hinged-support is connected on support and the shell, motor connects screw mandrel, screw mandrel cooperates with the feed screw nut, platen P1 is connected on the feed screw nut of horizontal direction travel mechanism, platen P2 is connected on the feed screw nut of vertical direction travel mechanism, and vertical direction travel mechanism is connected on the platen P1.
Laser instrument LD gives off laser beam and invests beam splitter BS1 generation two bundle laser beam, wherein laser beam 1 through beam splitter BS2 reflected illumination to object under test, its reflected light is arrived spatial frequency domain by lens L1 Fourier transform again behind beam splitter BS2, the segment space frequency spectrum passes rectangular opening wave filter SF, arrive beam splitter BS3 through lens L2 again, and laser beam 2 is invested beam splitter BS3 through mirror M 2, two-beam is interfered the formation hologram on photoelectric commutator CCD1 surface, and received by photoelectric commutator, obtain digital hologram through analog to digital conversion.
Big visual field of the present utility model numeral hologram recorder, it is provided with at the spatial frequency spectrum face can accurately control mobile filtering hole, can note the subhologram of different spectral coverage equably, by subhologram is carried out digital inverse Fourier transform, reconstitute corresponding wavelength coverage, and wavelength coverage is spliced to form complete thing optical spectrum, then entire spectrum is carried out Fourier transform once more, thereby obtain the reconstruct of picture, this device solves digital reproduction object visual angle be subjected to the problem of registering device resolution limit, realized in digital hologram, enlarging the effect of survey area.And palpus structure detection precision height, system bulk is little, the automaticity height.
Description of drawings
Fig. 1 is the big visual field numeral hologram recorder structure and the light path synoptic diagram of the embodiment of the invention
Fig. 2 is the big visual field numeral hologram recorder parts front view of the embodiment of the invention
Fig. 3 is the attached view of big visual field numeral hologram recorder parts of the embodiment of the invention
Fig. 4 is the big visual field numeral hologram recorder parts upward view of the embodiment of the invention
Embodiment
The present invention is further described below in conjunction with drawings and Examples.Following embodiment only is used to illustrate technical scheme of the present invention, but to not restriction of the present invention.
Embodiment
Big visual field of the present invention numeral hologram recording method, principle is to utilize 4F coherent image disposal system record digital hologram, at the spatial frequency spectrum face movably filtering hole is set, along with moving of aperture, the subhologram of record different spectral coverage.During reproduction, at first subhologram is carried out digital inverse Fourier transform, the wavelength coverage of reconstruct correspondence, and wavelength coverage is spliced to form complete thing optical spectrum, at last entire spectrum is carried out Fourier transform once more, thereby realize the reconstruct of picture, the concrete grammar step is as follows:
1) by convex lens the thing light wave is carried out optical Fourier transformation;
2) move at the spatial frequency spectrum face of thing light wave by the sub-aperture segmentation sampling apparatus that is equipped with rectangular opening wave filter, convex lens, beam splitter, photoelectric commutator and two-dimentional mobile platform etc., carry out sub-aperture segmentation sampling;
3) sampled result with each sub-aperture multiply by reference light, digital inverse Fourier transform, displacement respectively earlier, splices again;
4) with spliced thing light wave spatial frequency spectrum distribution the carrying out reconstructed image that digital Fourier transform obtains hologram.
According to shown in Figure 1, look the spatial frequency spectrum splicing apparatus of field boundary digital hologram greatly, comprise light path system, image and data collector, the computing machine three parts, light path system is by laser instrument LD, mirror M 2, beam splitter BS1, beam splitter BS2, condenser lens L1, rectangular opening filtrator SF, condenser lens L2, beam splitter BS3, two dimension mobile platform P constitutes, beam splitter BS2, condenser lens L1, rectangular opening filtrator SF, condenser lens L2, beam splitter BS3, photoelectric commutator CCD is arranged in order setting, at this moment, the rectangular opening wave filter in the sub-aperture segmentation sampling apparatus is positioned at the back focal plane of convex lens L1.Rectangular opening wave filter in the sub-aperture segmentation sampling apparatus is located at the front focal plane of convex lens L2, and photoelectric commutator is located at the back focal plane of convex lens L2.Rectangular opening filtrator SF, condenser lens L2, beam splitter BS3 is connected can move around at X and Y direction on the two-dimentional mobile platform P, by among Fig. 2 to Fig. 4 as can be known, the two dimension mobile platform is by platen P1, platen P2, horizontal direction travel mechanism 1, vertical direction travel mechanism 2 is formed, horizontal direction travel mechanism 1 is connected platen P1 side or below, vertical direction travel mechanism 2 is connected on the platen P1, platform 1 can drive vertical direction travel mechanism 2 and moves horizontally like this, platen P2 is connected in the vertical direction travel mechanism 2, platen P2 just both can move up and down also and can move horizontally like this, by among the figure as can be known, horizontal direction travel mechanism 1 is by support and shell 1a, feed screw nut 1b, screw mandrel 1c, hinged-support 1d, motor 1e is formed, vertical direction travel mechanism 2 is by support and shell 2a, feed screw nut 2b, screw mandrel 2c, hinged-support 2d, motor 2e is formed, motor 1e connects screw mandrel 1c, motor 1e drives screw mandrel 1c and rotates, and feed screw nut 1b moves along the platen P1 that drive simultaneously is connected on the feed screw nut 1b that moves axially of screw mandrel 1c.The support of vertical direction travel mechanism 2 and shell 2a are connected on the platen P1, feed screw nut 2b connects platen P2, motor 2e connects screw mandrel 2c, motor 2e drives screw mandrel 2c and rotates, and feed screw nut 2b drives the platen P2 that is connected on the feed screw nut 2b simultaneously along moving axially of screw mandrel 2c and moves axially promptly and move up and down.
The object under test object is placed the front focal plane of convex lens L1, laser instrument LD gives off laser beam and invests beam splitter BS1 generation two bundle laser beam, wherein laser beam 1 through beam splitter BS2 reflected illumination to object under test, its scattered light again after beam splitter BS2 reflection by lens combination L1 amplification imaging, pass rectangular opening filtrator SF, arrive beam splitter BS3 through lens combination L2 again, and laser beam 2 is invested beam splitter BS3 through mirror M 2, received by photoelectric commutator CCD1, data acquisition system (DAS) is that charge-coupled image sensor is photoelectric commutator CCD.
Use He-Ne laser in the experiment, wavelength is 632.8nm, and power is about 60mw.The focal length of 2 cemented doublets is respectively 50mm and 180mm, and the aperture is respectively 30mm and 50mm, and the enlargement ratio of the 4F coherent image disposal system of composition is about 3.6 times.CCD is the Grasshopper-50S5 type of being produced by PointGrey company, and pixel count is 1024 * 1024, is 3.45um * 3.45um as quick unit size.The model of digital control platform is Zolix TSA 300-B, and resolution is 2.5um, repetitive positioning accuracy:＜3um.The record object is cylindrical surface (a smooth sewing needle), and radius is 390um, and with parallel light pin post surface, the spectrum that has formed on the SP face than broad distributes, and the width of spatial frequency spectrum has reflected height and the width that body surface can be tested.Can estimate in this optical system that according to geometrical optics the face type height of testee is about 4.1um, face molded breadth degree is about 113.3um.Employing is from the axle image plane holographic, and reference light is a directional light, and ginseng thing angle is elected 4.2 ° as according to (16) formula, and the filtering aperture is elected 5mm * 8mm as according to (17), (18) formula.
The technology of utilizing this paper to propose, in recording process, mobile digital control platform makes that system moves in the frame of broken lines, when all spectrum components all cover on frequency plane, mobile end.The face type distribution situation that reproduce in each filtering aperture has been reproduced the various piece on the face of cylinder, from the left surface to the centre again to right flank.Each filtering aperture frequency spectrum is spliced, reappear the former spectrum distribution on SF plane, then the face type that obtains of digital reproduction distributes: face type height is 4.036um.According to the signal to noise ratio (S/N ratio) formula:
In the formula, A
Ideal: desirable face type distributes, A
Noise: noise profile, A
Real: the signal to noise ratio (S/N ratio) that the face type Distribution calculation that experiment is obtained can get the distribution of Mosaic face type is 266.9764dB.
Do not adopt the filtering record as a comparison, it is not overlapping to reproduce spectrum but the thing angle is joined in change, and because of high-frequency information is cut off and is effectively write down and cause reproduction to descend as signal to noise ratio (S/N ratio), face type height of its reproduction picture descends, and signal to noise ratio (S/N ratio) is reduced to 254.2557dB.Tri-dimensional facial type distributes and in fact to have reflected the height of object space frequency, has perhaps reflected the size of reproducing the object visual angle, thus result verification based on the feasibility of the Digital Holography with great visual angle that is filtered into picture.
This paper has proposed a kind of based on the Digital Holography with great visual angle that is filtered into picture.Set up the frequency spectrum split-join model of general object in 4F coherent image disposal system, with cylindrical surface (smooth sewing needle) is object, utilize this technology to reach the set goal, this technology not only can solve the problem that digital reproduction object visual angle is subjected to the registering device resolution limit, can also be applied in the microscopic digital holographic measurement field to obtain the global information of micro-object, be implemented in and enlarge survey area in the digital hologram.The frequency spectrum stitching error of actual object and correcting technology will be the emphasis of further work.
Because the limited pixel count of registering device, make that the high-frequency information of hologram can not be by effective record, thereby the resolution of reconstructed image is limited.The opposite type detects, and resolution is corresponding with the visual angle, and the essence of hologram visual angle problem is exactly resolution problem in other words.In addition, because the high frequency hologram is owed sampling or invalid sampling, the signal to noise ratio (S/N ratio) of hologram will be reduced.Increasing reproduction visual angle and effective method of signal to noise ratio (S/N ratio) is the synthetic aperture technology, if will carry out quantitative test to object plane type or phase information, must adopt the complex amplitude stacking method, this method requires each to reproduce light field relatively-stationary phase relation, the stability of register system and the displacement accuracy of CCD there is very high requirement, if any error, the difficulty that numeral revises will be increased.
We propose to utilize 4F coherent image disposal system record digital hologram, at the spatial frequency spectrum face movably filtering hole are set, along with moving of aperture, and the subhologram of record different spectral coverage.During reproduction, at first subhologram is carried out digital fourier transformation, the wavelength coverage of reconstruct correspondence, and wavelength coverage is spliced to form complete thing optical spectrum, at last entire spectrum is carried out Fourier transform once more, thereby obtain the reconstruct of picture.According to the phase shift properties of Fourier transform, if phase shifts has taken place in recording process hologram, space displacement will take place in its frequency spectrum, can reflect on the spectrum face intuitively like this, be convenient to splice correction.
Claims (3)
1. big visual field numeral hologram recorder that adopts spatial frequency spectrum splicing, comprise light path system, image and data collector, the computing machine three parts, it is characterized in that: light path system is by laser instrument LD, mirror M 2, beam splitter BS1, beam splitter BS2, convex lens L1, rectangular opening wave filter SF, convex lens L2, beam splitter BS3, two dimension mobile platform P constitutes, beam splitter BS2, convex lens L1, rectangular opening wave filter SF, convex lens L2, beam splitter BS3, photoelectric commutator CCD is arranged in order setting, rectangular opening wave filter SF, convex lens L2, beam splitter BS3 is connected on the two-dimentional mobile platform P, laser instrument LD gives off laser beam and invests beam splitter BS1 generation two bundle laser beam, wherein laser beam 1 through beam splitter BS2 reflected illumination to object under test, its reflected light is arrived spatial frequency domain by lens L1 Fourier transform again behind beam splitter BS2, the segment space frequency spectrum passes rectangular opening wave filter SF, arrive beam splitter BS3 through lens L2 again, and laser beam 2 is invested beam splitter BS3 through mirror M 2, two-beam is interfered the formation hologram on photoelectric commutator CCD1 surface, and received by photoelectric commutator, obtain digital hologram through analog to digital conversion.
2. big visual field as claimed in claim 1 numeral hologram recorder is characterized in that: described two-dimentional mobile platform P by platen P1, be connected vertical direction elevating mechanism on the platen P1, be connected the platen P2 on the elevating mechanism and be connected that platen P2 horizontal direction travel mechanism forms.
3. big visual field as claimed in claim 2 numeral hologram recorder, it is characterized in that: described horizontal direction travel mechanism and vertical direction travel mechanism are made up of support and shell, feed screw nut, screw mandrel, hinged-support, motor, hinged-support is connected on support and the shell, motor connects screw mandrel, screw mandrel cooperates with the feed screw nut, platen P1 is connected on the feed screw nut of horizontal direction travel mechanism, platen P2 is connected on the feed screw nut of vertical direction travel mechanism, and vertical direction travel mechanism is connected on the platen P1.
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| CN2010205993732U CN202034034U (en) | 2010-11-01 | 2010-11-01 | Large field of view digital hologram recording device |
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| CN2010205993732U CN202034034U (en) | 2010-11-01 | 2010-11-01 | Large field of view digital hologram recording device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467922A (en) * | 2010-11-01 | 2012-05-23 | 浙江师范大学 | Recording method and device for large view field digital hologram |
| WO2013086940A1 (en) * | 2011-12-12 | 2013-06-20 | 苏州科雷芯电子科技有限公司 | Compact disk reading device |
| CN103226001A (en) * | 2013-04-16 | 2013-07-31 | 上海大学 | Measuring device and measuring method for tiny surface defect through post-magnification digital holographic microscopy |
| CN103615971A (en) * | 2013-11-19 | 2014-03-05 | 苏州慧利仪器有限责任公司 | Optical interferometer used for detecting outer surface of cylinder |
| CN105023275A (en) * | 2015-07-14 | 2015-11-04 | 清华大学 | Super-resolution light field acquisition device and three-dimensional reconstruction method thereof |
| CN115071128A (en) * | 2022-06-10 | 2022-09-20 | 西安交通大学 | Fast holographic 3D copying method and system based on Fourier transform |
-
2010
- 2010-11-01 CN CN2010205993732U patent/CN202034034U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467922A (en) * | 2010-11-01 | 2012-05-23 | 浙江师范大学 | Recording method and device for large view field digital hologram |
| WO2013086940A1 (en) * | 2011-12-12 | 2013-06-20 | 苏州科雷芯电子科技有限公司 | Compact disk reading device |
| CN103226001A (en) * | 2013-04-16 | 2013-07-31 | 上海大学 | Measuring device and measuring method for tiny surface defect through post-magnification digital holographic microscopy |
| CN103615971A (en) * | 2013-11-19 | 2014-03-05 | 苏州慧利仪器有限责任公司 | Optical interferometer used for detecting outer surface of cylinder |
| CN103615971B (en) * | 2013-11-19 | 2016-06-29 | 苏州慧利仪器有限责任公司 | For detecting the optical interdferometer of cylindrical outer surface |
| CN105023275A (en) * | 2015-07-14 | 2015-11-04 | 清华大学 | Super-resolution light field acquisition device and three-dimensional reconstruction method thereof |
| CN105023275B (en) * | 2015-07-14 | 2018-08-28 | 清华大学 | Super-resolution optical field acquisition device and its three-dimensional rebuilding method |
| CN115071128A (en) * | 2022-06-10 | 2022-09-20 | 西安交通大学 | Fast holographic 3D copying method and system based on Fourier transform |
| CN115071128B (en) * | 2022-06-10 | 2024-02-27 | 西安交通大学 | Fast holographic 3D copying method and system based on Fourier transform |
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Granted publication date: 20111109 Termination date: 20131101 |