Two-step phase-shift coaxial holography technology realizes 90° phase shift and calibration system and method

A holographic technology and calibration system technology, applied in the field of 0° phase shift and calibration system, can solve the problems of 90° phase shift and calibration methods that have not been reported in literature, and achieve the effects of simple structure, high adjustment accuracy and few optical components
CN106019913BActive Publication Date: 2018-12-07SHANGHAI UNIV
4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2018-12-07

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a system and method of utilizing the two-step phase-shifting coaxial holographic technology to realize 90 DEG phase shift and calibration. The method comprises: establishing a mach-zehnder double beam plane quasi coaxial holographic optical path system, and separately adding a standard glass slide into an object optical path and a reference light path; adding a condensing lens into the object optical path to converge with the plane of the reference light path to form spherical interference fringes; the spherical interference fringes being distributed in a Sinc function, fine tuning a rotating platform to allow the center of a Sinc function distribution curve to be a maximum value; continuing fine tuning the rotating platform, allowing the center of a sampled Sinc function distribution curve to be a minimum value; and removing the condensing lens in the object optical path, placing a tested sample, and marking according to twice scale values of the rotating platform so as to collect two holograms with 90 DEG phase shift. The recording device referred in the method has the characteristics of less optical elements, simple structure, convenient operation, high adjusting precision, and low cost, and can realize 90 DEG phase shift and calibration in the two-step phase-shifting coaxial holographic technology.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a system and method for realizing 90° phase shift and calibration in two-step phase shift coaxial holography technology. Background technique

[0002] Phase-shift digital holography is a digital holographic technology developed by combining phase-shifting technology with digital holographic technology. During the recording process of the hologram, the phase of the reference light relative to the object light is changed to record multiple phase-shifted holograms, and then the recorded holograms are processed and numerically reconstructed using the corresponding phase-shift algorithm and digital reconstruction algorithm to restore the measured The complex amplitude distribution of the object and realize the quantitative observation. Through phase-shift operation, phase-shift digital holography can effectively solve the interference problem of zero-order and conjugate images in holographic reconstruction in the case of coaxial re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More