Coaxial digital holography method capable of effectively inhibiting zero-order and conjugate images

A digital holographic and conjugate technology, applied in the field of holography, can solve problems such as complex calculations of multiple holograms

Inactive Publication Date: 2011-01-26
HAIAN JULI MAGNETIC MATERIAL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a coaxial holographic method that can effectively suppress zero-order diffraction and conjugate images. Through the special design of the digital hologram recording process, only one digital hologram is used, and A holographic reconstruction image that suppresses zero-order diffraction and conjugate images is obtained through simple numerical calculations, which overcomes the shortcomings of existing methods such as the need to record multiple holograms or complex calculations

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  • Coaxial digital holography method capable of effectively inhibiting zero-order and conjugate images
  • Coaxial digital holography method capable of effectively inhibiting zero-order and conjugate images
  • Coaxial digital holography method capable of effectively inhibiting zero-order and conjugate images

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Embodiment 1

[0042] Example 1: See figure 1 and figure 2 . This embodiment is a coaxial digital holographic method that can effectively suppress zero-order diffraction and conjugate images for wooden chess pieces of diffuse objects. This embodiment includes a diffuse object to be measured 3, a CCD camera 5, and a small hole. Aperture 4, beam splitting device 6, laser beam 1 reflected or transmitted from diffuse object 3, reference light wave 2 coherent with laser beam 1, reproduced illumination light wave 7 conjugated to reference light wave 2, and holographic interferogram H, diffraction Pattern H 1 、H 2 and H 3 .

[0043] The working process of this embodiment is: a pinhole diaphragm 4 is set between the diffuse reflection type object 3 to be measured and the CCD camera 5 for digitally recording the holographic interferogram, and the laser light is irradiated and passed through the diffuse type object 3 or from the diffuse type The laser beam 1 reflected by the surface of the obje...

Embodiment 2

[0056] Example 2: See image 3 and Figure 4 . This embodiment is a coaxial digital holography method that can effectively suppress zero-order diffraction and conjugate images for transparent biological cell slices of transmission objects. This embodiment includes a transmission object to be measured 8, a CCD camera 5, a spectroscopic device 6, a transmission The converging spherical laser beam 1 of the diffuse object 8, the reference light wave 2 coherent with the laser beam 1, the reconstructed illumination light wave 7 conjugated with the reference light wave 2, and the holographic interferogram H, the diffraction pattern H 1 、H 2 and H 3 .

[0057] The working process of this embodiment is as follows: irradiate with the converging laser beam 1 and pass through the transmission type object 8 to be measured to reach the CCD camera 5 of the digitally recorded holographic interferogram to form an object light wave, and the object light wave interferes with the reference li...

Embodiment 3

[0069] Example 3: See Figure 5 and Figure 6 . This embodiment is a coaxial digital holographic method that can effectively suppress zero-order diffraction and conjugate images for red blood cell slices of transmission-type objects. This embodiment includes a transmission-type object to be measured 8, an imaging lens 9, a CCD camera 5, and a spectroscopic device 6. The parallel laser beam 1 passing through the diffuse object 8, the reference light wave 2 coherent with the laser beam 1, the reproduced illumination light wave 7 conjugated with the reference light wave 2, and the holographic interferogram H, the diffraction pattern H 1 、H 2 、H 3 and H 4 .

[0070] The working process of this embodiment is: an imaging lens 9 is set between the transmission-type object 8 to be measured and the CCD camera 5 for digitally recording the holographic interferogram, and the parallel laser beam 1 is irradiated and passed through the object 8 to be measured, and converged through the...

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Abstract

The invention relates to a coaxial digital holography method capable of effectively inhibiting zero-order and conjugate images. The method is characterized in that: aiming at a diffuse reflection type object or a transmission type object, through special design of a digital hologram recording process, a holographic reproduction image inhibiting the zero-order diffraction and conjugate image is acquired through simple numerical calculation by using only one digital hologram; and in a hologram reproduction process, an aperture or low-pass filtering operation can buffer zero-order + one-order diffraction optical waves and all the high-order diffraction optical waves and only allows the -1-order diffraction optical wave to transmit, so that the -1-order hologram is separated and reproduced. Compared with the traditional coaxial digital hologram, of which the reproduction of the hologram is seriously interfered by the zero-order and conjugate image, the holographic reproduction image by the method has ideal effect and overcomes the defects of non-instantaneity of the methods, such as phase shift, HRO substraction and the like, and complexity, multi-step calculation and the like of numerical iteration algorithm.

Description

technical field [0001] The invention relates to the field of holographic technology, in particular to a coaxial digital holographic method capable of effectively suppressing zero-order and conjugate images. Background technique [0002] British scholar Gabor first proposed the idea of ​​coaxial holography when he was studying how to improve the resolving power of the electron microscope. The characteristic of coaxial holography is that the reference light wave is coaxial with the object light wave, the recording light path is simple, and the coherence requirements for the environment and light source are low. But the disadvantage is that the zero-order diffraction (that is, straight light) and the conjugate image are also coaxial with the reproduced image of the original object field, so that the reproduced image of the original object field is strongly disturbed by the background, and the quality of the reproduced image is reduced. Compared with coaxial holography, there i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/021G01N21/45
Inventor 赵建林邸江磊
Owner HAIAN JULI MAGNETIC MATERIAL CO LTD
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