CN104793475A - Non-coherent telescoping digital holographic imaging method and assorted device - Google Patents
Non-coherent telescoping digital holographic imaging method and assorted device Download PDFInfo
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Abstract
The invention provides a non-coherent telescoping digital holographic imaging method, and belongs to the technical field of non-coherent holographic three-dimensional imaging. Light which is transmitted or reflected through a target object can be outputted into parallel light beams via a convergence/collimation system, after the parallel light beams are processed by a polarizing film, an interference filter and a phase type spatial light modulator sequentially, an obtained hologram is received by an image sensor; the image sensor outputs signals to a central processing unit; and an image of the target object is reestablished by the central processing unit through a phase shift technology and a diffraction reappearance algorithm. The non-coherent telescoping digital holographic imaging method has characteristics of simple structure, small data volume, high imaging speed, low requirements on an environment of an imaging system and the like, and is suitable for industrial and commercial application of a holographic technique, and has high application value in the macroscopic fields of military affairs, remote sensing satellites, astronomy, engineering detection and the like.
Description
Technical field
The invention belongs to incoherent hologram three-dimensional technical field of imaging, particularly disclose a kind of incoherent digital hologram formation method and corollary apparatus of looking in the distance.
Background technology
Holographic imaging utilizes principle of interference, is recorded in hologram, reconstructed the 3-D view comprising object depth information by diffraction effect by object light wave amplitude and phase information with the form of interference fringe.Conventional photographic is light source with laser, causes relying on the height of light source coherence, system stability, and the application of holographic technique is extremely restricted.Digital hologram uses imageing sensor (CCD/CMOS) to carry out record, the 3-D view of object is rebuild in a computer by data processing, although structure is simple, abundant information, picture quality improve, do not overcome the dependence to light source and system yet.In recent years, the incoherent relevant holography of Fresnel (the Fresnel incoherent correlation holography that Rosen J etc. propose, FINCH) self-interference of the incoherent Object light wave in space is achieved, utilize self-interference technology to overcome dependence to light source and system, 3D hologram imaging technique has been extended to incoherent field veritably from relevant art.Rosen J and Brooker G designs the three-dimensional static Non-scanning mode X-ray fluorescence holography microscopic system based on FINCH structure, ten thousand rubine etc. are FINCH Experimental Control System based on LabVIEW environment exploitation, Zhong Liyun etc. study discovery, under same experimental conditions restriction, the resolution that the situation that spatial light modulator loads two spherical waves reaches is much larger than the situation loading single spherical wave.The research majority of above-mentioned incoherent digital hologram concentrates on the micro imaging system such as biology, medical science, but, report relative less for integrated telescopic system with the research of the incoherent digital hologram of looking in the distance of incoherent holography.Kim M K etc. utilizes self-interference technology, proposes incoherent self-interference colorful digital holographic.Although incoherent self-interference digital hologram is integrated with telescopic system, adopt Michelson interferometer as non-coherent correlator and beam splitter, utilize piezoelectric ceramic actuator to control phase-shift phase.Due to Michelson interferometer structure adjust the distance control accuracy height rely on, phase-shift phase accuracy also directly affects the signal to noise ratio (S/N ratio) of imaging.In addition, incoherent self-interference colorful digital holographic also exists that experiment parameter is inharmonious, the reconstruction of object reproduction image is apart from the series of problems such as bigger than normal, signal intensity is weak.These problems greatly constrain incoherent Digital Holography of looking in the distance in the industrialization of the macroscopic arts such as satellite imagery, uranology imaging and engineering detecting and commercial applications.
Summary of the invention
The object of the present invention is to provide a kind of incoherent digital hologram formation method of looking in the distance, provide its corollary apparatus to be another goal of the invention of the present invention.
Based on above-mentioned purpose, this invention takes following technical scheme: a kind of incoherent digital hologram formation method of looking in the distance, the light of target object transmission or reflection exports as parallel beam through convergence/colimated light system, the hologram that this parallel beam obtains further after polaroid, interference filter and phase type spatial light modulator process successively is received by imageing sensor, signal is exported to CPU (central processing unit) by imageing sensor, is reconstructed the picture of target object by CPU (central processing unit) by phase-shifting technique and diffraction reconstruction algorithm.
Described phase type spatial light modulator loads the spherical wave of two different radiis.
Described phase-shifting technique is three step phase-shifting techniques, and its phase-shift phase is respectively 0, pi/2, π; The mathematic(al) representation of its phase shift algorithm is H=[I
0-I
π+ j (2I
pi/2-I
0-I
π)]/4, wherein H is integral hologram; I
0, I
pi/2, I
πthe hologram of corresponding phase-shift phase 0, pi/2, π respectively, j is imaginary number.
With the device that described incoherent digital hologram formation method of looking in the distance is supporting, comprise the convergence/colimated light system, polaroid, interference filter, phase type spatial light modulator and the imageing sensor that are successively set in light path, the output terminal of imageing sensor is connected with the input end of CPU (central processing unit).
Described convergence/colimated light system comprises convergent lens and the collimation lens of coaxial setting, and described convergent lens comparatively collimation lens is bordering on target object, and convergent lens is positioned near the front focal plane of collimation lens for target object imaging.
Described convergence/colimated light system comprises the coaxial collimating mirror of setting and the concave mirror of central openings; The setting position of collimating mirror comparatively concave mirror is bordering on target object, and the concave mirror of described central openings is positioned at target object imaging near the focal plane of collimating mirror.
The number of pixels of described phase type spatial light modulator is 1920 × 1080 pixels, and pixel separation is 8 μm, and phase linearity modification scope is 0 ~ 2 π.
The centre wavelength of described interference filter is 532 nm or 632.8 nm, and bandwidth is 10 nm.
Described imageing sensor is charge-coupled image sensor, and its number of pixels is 1024 × 1024 pixels, and pixel separation is 6.45 μm.
Compared with prior art, the present invention has following beneficial effect:
1) the invention provides a kind of novel incoherent digital hologram formation method of looking in the distance based on spatial light modulator, under white light or natural lighting condition, all can realize the three-dimensional imaging of distant objects.
2) imaging system of the present invention has the characteristics such as structure is simple, data volume is little, image taking speed is fast, imaging system environment requirement is low, be suitable for industrialization and the commercial applications of holographic technique, at macroscopic arts such as military affairs, remote sensing satellite, uranology and engineering detecting, there is higher using value.
Accompanying drawing explanation
Fig. 1 is the structural representation of novel incoherent digital hologram imaging device of looking in the distance in embodiment 2;
Fig. 2 is the structural representation of novel incoherent digital hologram imaging device of looking in the distance in embodiment 3;
Fig. 3 utilizes the device in embodiment 2 to the experimental result of tilted-putted resolving power test target imaging;
Fig. 4 utilizes device in embodiment 2 to the experimental result of rule imaging;
Fig. 5 is the result utilizing the device in embodiment 3 three-dimensional body imaging to be carried out to computer simulation.
Embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated.
embodiment 1
A kind of incoherent digital hologram formation method of looking in the distance, the light of target object transmission or reflection exports as parallel beam through convergence/colimated light system, the hologram that this parallel beam obtains further after polaroid, interference filter and phase type spatial light modulator process successively is received by imageing sensor, signal is exported to CPU (central processing unit) by imageing sensor, is reconstructed the picture of target object by CPU (central processing unit) by phase-shifting technique and diffraction reconstruction algorithm.
Phase type spatial light modulator loads the spherical wave of two different radiis.
Phase-shifting technique is three step phase-shifting techniques, and its phase-shift phase is respectively 0, pi/2, π; The mathematic(al) representation of its phase shift algorithm is H=[I
0-I
π+ j (2I
pi/2-I
0-I
π)]/4, wherein H is integral hologram; I
0, I
pi/2, I
πthe hologram of corresponding phase-shift phase 0, pi/2, π respectively, j is imaginary number.
embodiment 2
With the device that the incoherent digital hologram formation method of looking in the distance described in embodiment 1 is supporting, as shown in Figure 1, comprise the convergence/colimated light system be successively set in light path, polaroid 7, interference filter 8, phase type spatial light modulator 9 and imageing sensor 10, the output terminal of imageing sensor 10 is connected with the input end of CPU (central processing unit).
Convergence/colimated light system comprises convergent lens 3 and the collimation lens 4 of coaxial setting, and convergent lens 3 comparatively collimation lens 4 is bordering on target object 2, and convergent lens 3 is positioned at the front focal plane of collimation lens 4 for target object 2 imaging.
Its light path process is: the incident light that white light source 1 sends irradiates target object 2, assembled through convergent lens 3 by target object 2 transmission or reflecting light, after collimation lens 4 collimates, successively through polaroid 7 and interference filter 8, transmitted light, after phase type spatial light modulator 9 is modulated, is received by imageing sensor 10.Convergent lens 3 pairs of target object 2 imagings are positioned at the front focal plane of collimation lens 4.The centre wavelength of interference filter 8 is 632.8 nm, the number of pixels of phase type spatial light modulator 9 is 1920 × 1080 pixels, pixel separation is 8 μm, imageing sensor 10 is charge coupled device ccd, and the number of pixels of charge coupled device ccd is 1024 × 1024 pixels, pixel separation is 6.45 μm.
Utilize this device to carry out record to resolving power test target and rule respectively, its result as shown in Figure 3 and Figure 4.
Fig. 3 (a) is depicted as the incoherent hologram intensity distributions of the tilted-putted resolving power test target utilizing this device record; Then three step phase-shifting techniques are adopted to calculate the complex value hologram of resolving power test target, as shown in Fig. 3 (b); Recycling diffraction reconstruction algorithm reconstructs the picture of resolving power test target, as shown in Fig. 3 (c) He (d), Fig. 3 (c) represents that resolving power test target the 0th group of the 6th unit grating is in the reproduction image of best focus, and Fig. 3 (d) represents that resolving power test target the 1st group of the 1st unit grating is in the reproduction image of best focus.To the experimental result of rule imaging as shown in Figure 4, the incoherent hologram intensity distributions of the rule of this device record is utilized to see Fig. 4 (a), the complex value hologram of the rule adopting three step phase-shifting techniques to calculate is shown in Fig. 4 (b), and Fig. 4 (c) is shown in by the picture of the rule utilizing diffraction reconstruction algorithm to reconstruct.From result shown in Fig. 3 and Fig. 4, under white light or natural lighting, utilize the corollary apparatus of this incoherent digital hologram formation method of looking in the distance can fast recording any distant objects of reproducing 3-D view clearly.
embodiment 3
With the device that the incoherent digital hologram formation method of looking in the distance described in embodiment 1 is supporting, as shown in Figure 2, this device difference from Example 2 is: assemble convex lens 3 and replaced by the concave mirror 5 of central openings, collimation convex lens 4 are replaced by collimating mirror 6, and collimating mirror 6 is positioned at the front end of the concave mirror 5 of central openings, the setting position of collimating mirror comparatively concave mirror is bordering on target object, and the concave mirror of described central openings is positioned at the focal plane of collimating mirror to target object imaging.
The incident light sent by white light source 1 irradiates target object 2, assembled through the concave mirror 5 of central openings by target object 2 transmission or reflecting light, after collimating mirror 6 collimates, successively through polaroid 7 and interference filter 8, transmitted light, after phase type spatial light modulator 9 is modulated, is received by imageing sensor 10.Concave mirror 5 pairs of target object 2 imagings of central openings are positioned at the focal plane of collimating mirror 6.Wherein, the centre wavelength of interference filter 8 is 532 nm, and the number of pixels of phase type spatial light modulator 9 is 1920 × 1080 pixels, pixel separation is 8 μm, imageing sensor 10 is CCD, and the number of pixels of CCD is 1024 × 1024 pixels, and pixel separation is 6.45 μm.
Utilize this imaging device to three-dimensional body hologram record, then by computer simulation hologram record and reproducing processes, result as shown in Figure 5.Imaging system to the complex value hologram of the computer simulation of three-dimensional body as shown in Fig. 5 (a), three-dimensional body hologram amplitude and PHASE DISTRIBUTION are shown in Fig. 5 (b) and (c), and Fig. 5 (d) ~ (f) be shown in by the picture of the three-dimensional body adopting diffraction reconstruction algorithm to reconstruct.Result is known as shown in Figure 5, under white light or natural lighting, utilizes the corollary apparatus of this incoherent digital hologram formation method of looking in the distance can fast recording any distant objects of reproducing 3-D view clearly.
Claims (9)
1. an incoherent digital hologram formation method of looking in the distance, it is characterized in that, the light of target object transmission or reflection exports as parallel beam through convergence/colimated light system, the hologram that this parallel beam obtains further after polaroid, interference filter and phase type spatial light modulator process successively is received by imageing sensor, signal is exported to CPU (central processing unit) by imageing sensor, is reconstructed the picture of target object by CPU (central processing unit) by phase-shifting technique and diffraction reconstruction algorithm.
2. incoherent digital hologram formation method of looking in the distance as claimed in claim 1, is characterized in that, described phase type spatial light modulator loads the spherical wave of two different radiis.
3. incoherent digital hologram formation method of looking in the distance as claimed in claim 2, it is characterized in that, described phase-shifting technique is three step phase-shifting techniques, and its phase-shift phase is respectively 0, pi/2, π; The mathematic(al) representation of its phase shift algorithm is H=[I
0-I
π+ j (2I
pi/2-I
0-I
π)]/4, wherein H is integral hologram; I
0, I
pi/2, I
πthe hologram of corresponding phase-shift phase 0, pi/2, π respectively, j is imaginary number.
4. the device supporting with the arbitrary described incoherent digital hologram formation method of looking in the distance of claim 1 ~ 3, it is characterized in that, comprise the convergence/colimated light system, polaroid, interference filter, phase type spatial light modulator and the imageing sensor that are successively set in light path, the output terminal of imageing sensor is connected with the input end of CPU (central processing unit).
5. device supporting as claimed in claim 4, it is characterized in that, described convergence/colimated light system comprises convergent lens and the collimation lens of coaxial setting, described convergent lens comparatively collimation lens is bordering on target object, and convergent lens is positioned near the front focal plane of collimation lens for target object imaging.
6. device supporting as claimed in claim 4, is characterized in that, described convergence/colimated light system comprises the coaxial collimating mirror of setting and the concave mirror of central openings; The setting position of collimating mirror comparatively concave mirror is bordering on target object, and the concave mirror of described central openings is positioned at target object imaging near the focal plane of collimating mirror.
7. the supporting device as described in claim 5 or 6, is characterized in that, the number of pixels of described phase type spatial light modulator is 1920 × 1080 pixels, and pixel separation is 8 μm, and phase linearity modification scope is 0 ~ 2 π.
8. device supporting as claimed in claim 7, is characterized in that, the centre wavelength of described interference filter is 532 nm or 632.8 nm, and bandwidth is 10 nm.
9. device supporting as claimed in claim 8, is characterized in that, described imageing sensor is charge-coupled image sensor, and its number of pixels is 1024 × 1024 pixels, and pixel separation is 6.45 μm.
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| CN109709785A (en) * | 2019-01-24 | 2019-05-03 | 中国科学院长春光学精密机械与物理研究所 | A kind of holography telescopic system and telescope |
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| CN108459485A (en) * | 2018-01-19 | 2018-08-28 | 中国科学院上海光学精密机械研究所 | The incoherent correlated digital holography generation device of Fresnel based on plane of polarization lens |
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| US11720060B2 (en) | 2018-08-13 | 2023-08-08 | Shanghai Institute Of Optics And Fine Mechanics, Chinese Academy Of Sciences | Single-shot Fresnel non-coherent correlation digital holographic device based on polarization-oriented planar lens |
| CN109709785A (en) * | 2019-01-24 | 2019-05-03 | 中国科学院长春光学精密机械与物理研究所 | A kind of holography telescopic system and telescope |
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