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Optical scanning holographic technique without mechanical motion scanning

A technology of optical scanning and holographic technology, applied in the field of optical holographic imaging, it can solve the problems such as the limitation of scanning accuracy of lateral resolution effect, affecting the effect of object image reconstruction, and increasing system cost.

Inactive Publication Date: 2016-05-25
SICHUAN UNIV
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Problems solved by technology

In this system, the two-dimensional plane scanning often adopts the method of mechanical scanning, and the horizontal resolution effect of the reconstructed image of the system is largely limited by the scanning accuracy.
However, if a high-precision mechanical scanning device is used, it will undoubtedly increase the cost of the system
In addition, the mechanical scanning process mainly relies on controlling the start-stop movement of the stepping motor, and the unavoidable micro-jitter will cause deviations in the recording of the hologram, thereby affecting the reconstruction effect of the object image

Method used

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  • Optical scanning holographic technique without mechanical motion scanning
  • Optical scanning holographic technique without mechanical motion scanning
  • Optical scanning holographic technique without mechanical motion scanning

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Embodiment Construction

[0052] Combine below Attached picture The present invention is further described, and a specific embodiment of the present invention is described.

[0053] In this embodiment, a solid-state laser with an output power of about 20mW is used as a light source, the light wavelength is λ=532nm, the pupil size is D=5mm×5mm (128×128pixels), and the resolution of the digital micromirror device (DMD) is 1920 ×1080, the measured object is like figure 2 As shown in the 5mm×5mm (128×128pixels) character image, the distance from the measured object and the point element object (pinhole) to the DMD is 20cm.

[0054] The whole experimental process was carried out according to the aforementioned steps (1)-(5). The DMD configuration matrix is ​​a random matrix, and each element has only two values ​​of 0 and 1, which are randomly determined according to the probability of 50%; in order to compare the experimental results under the conditions of sampling rate of 15% and 30%, 2500 and 500...

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Abstract

The invention discloses an optical scanning holographic technique without mechanical motion scanning and belongs to the field of optical imaging. The optical scanning holographic technique is used for improving the traditional optical scanning holographic system. According to the optical scanning holographic technique, a digital micro-mirror device is used for replacing a two-dimensional mechanical scanning device in the traditional system and a compressing sensitive technique is applied to the two key links of data recording and plural hologram reconstruction, so that the problems caused by the factors, such as, precision and jittering of mechanical motion scanning in the traditional system are solved, the volume of to-be-recorded data of the system is extremely reduced, and the technique also can be used for reconstructing images with acceptable quality even under the condition of lower sampling rate.

Description

technical field [0001] The invention belongs to the field of optical holographic imaging, in particular to an optical scanning holographic imaging method. Background technique [0002] Optical scanning holography is an unconventional digital holographic technology proposed by Professor Poon and others in the United States (T.-C. Poon, "Scanningholography and two-dimensional image processing by acoustic to-optic two-pupilsynthesis," J.Opt.Soc.Am.A2, 621–627, 1985). Different from the traditional way of recording holographic information by interference of object light and reference light, this technology is based on a double-pupil optical system and uses active optical heterodyne scanning to obtain holographic data information (including amplitude and phase) of three-dimensional objects. Its working process is that only through one two-dimensional plane scanning, the single-pixel detector can record the intensity information of each layer distributed along the longitudinal di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/08G03H1/10
CPCG03H1/0866G03H1/10G03H2001/2292
Inventor 周昕呼有军孙阿茜
Owner SICHUAN UNIV
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