Digital hologram-based high-precision spherical surface sub-aperture splicing fusion method

A digital hologram and aperture splicing technology, which is applied to measurement devices, instruments, and optical devices, etc., can solve problems such as measurement result errors, and achieve the effects of accurate phase value, simple calculation process, and improved accuracy and reliability.

Inactive Publication Date: 2016-01-13
BEIHANG UNIV
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the measurement results contain errors due to the inaccuracy of positioning in spherical surface splicing measurement, the present invention proposes a high-precision spherical surface sub-aperture splicing and fusion method based on digital holograms, based on digital

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital hologram-based high-precision spherical surface sub-aperture splicing fusion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0028] The present invention is a high-precision spherical sub-aperture splicing and fusion method based on digital holograms. Firstly, the digital reproduction calculation is performed on the sub-aperture holograms obtained based on the off-axis holographic optical path, and the mathematical model of the system optical path and positioning error is used to correct the positioning error due to positioning errors. The phase aberration introduced by the error is digitally corrected to obtain the phase map of each sub-aperture; then, the sub-aperture phase map is spliced ​​and fused by using the sub-aperture stitching algorithm, and the relative position error of the sub-aperture is further corrected to obtain the phase map of the spherical full aperture , the process is as figure 1 shown, including the following steps:

[0029] The first step is to dig...

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

PUM

No PUM Login to view more

Abstract

The invention discloses a digital hologram-based high-precision spherical surface sub-aperture splicing fusion method. The method of the invention is based on digital holographic technology and sub-aperture splicing technology; a spherical surface sub-aperture hologram measured through adopting the digital holographic technology is subjected to digital reproduction, so that sub-aperture phase diagrams can be obtained, and the sub-aperture phase diagrams are subjected to splicing fusion, and therefore a full-field-of-view spherical surface phase diagram can be obtained; and digital reproduction calculation is performed on the obtained sub-aperture hologram data based on an off-axis holographic optical path. The method specifically includes the following steps that: image apodization, frequency-domain filtering, aberration compensation and digital focusing reproduction are performed sequentially; and the splicing fusion of the sub-aperture phase diagrams is completed through adopting a sub-aperture splicing algorithm, and sub-aperture relative position errors are further corrected through iterative calculation, so that the phase diagram of a complete spherical surface can be obtained. The digital hologram-based high-precision spherical surface sub-aperture splicing fusion method of the invention has the advantages of fully-digitized data processing process, high precision, simple operation, high reliability and the like, and can detect data processing of a spherical surface based on the digital holographic technology.

Description

technical field [0001] The invention relates to a digital hologram-based splicing and fusion method of spherical sub-apertures, which can be used for splicing and fusion when digital holographic technology detects the three-dimensional shape of a spherical surface. Background technique [0002] In the three-dimensional shape measurement of the surface of spherical objects, optical interferometry, as a typical non-contact measurement method, has been widely used, especially the standard optical interferometer. By using a standard mirror that matches the parameters of the measured object, the measurement of the surface topography of the measured object can be completed. However, in the surface topography measurement of three-dimensional objects, especially for three-dimensional objects with characteristics such as large aperture, high numerical aperture, and large curvature, due to the limitation of the output beam aperture of the standard interferometer and the specification ...

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

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01B11/24
Inventor 潘锋肖文吕晓云马希超董斌
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap