Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Method for Generating Programmable Analog Grating with Large Depth of Field

A grating and depth-of-field technology, applied in the field of optical detection, can solve the problems of limited three-dimensional measurement range, fixed projection pattern, inflexible use, etc., to achieve the effect of improving three-dimensional measurement accuracy, expanding depth of field, and improving measurement range

Active Publication Date: 2019-05-07
XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage of physical grating is that the projection pattern is fixed and the use is not flexible
In addition, no matter the analog pattern of digital light projection technology or physical grating projection, it is an image of the film, which is an imaging relationship, so there is a limitation of depth of field
Greatly limits the range of 3D measurements

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
  • A Method for Generating Programmable Analog Grating with Large Depth of Field
  • A Method for Generating Programmable Analog Grating with Large Depth of Field
  • A Method for Generating Programmable Analog Grating with Large Depth of Field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039]The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] The technical solution is:

[0041] The first step is to design the working parameters of the system. Determine the maximum working distance L according to the working distance of the grating 2 , the minimum working distance L 1 ; the maximum spot ω of ΔL within the depth of field max ; The number M of lines scanned by a single frame raster image, M is determined by the characteristics of the laser beam.

[0042] The second step is to generate the driving signal. There are three types of drive signals involved. 1) MEMS scanning galvanometer fast axis drive signal, which is a current signal of sine (or cosine) waveform, its frequency f x Equal to the resonant frequency f of the fast axis direction of the MEMS scanning galvanometer, its peak-to-peak value I x峰峰 Determined by the parameters of the MEMS galvanometer. 2) The slow axis drive signal of the MEM...

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 method for generating a programmable analog grating with a large depth of field. The laser beam emitted by a laser is focused and collimated by a collimator lens to obtain a collimated Gaussian laser beam that meets the requirements; The laser beam is incident on the MEMS vibrating mirror through the circular aperture; the beam is reflected to the surface of the object to be measured through the MEMS vibrating mirror; under the control of the sinusoidal current signal generated by the drive board, the laser performs sinusoidal modulation on the brightness of the laser beam; the MEMS vibrating mirror is driven Under the excitation of the driving signal generated by the board, it makes a two-dimensional rotation, thereby driving the laser beam to scan and generate a raster image. Change the period and phase of the laser driving signal to obtain grating patterns with different periods and phases. The grating produced by the invention has the advantages of programmable digital grating and high resolution of physical grating. In addition, the depth of field of the resulting grating has been expanded by more than 10 times, and the measurement range has been greatly improved.

Description

Technical field: [0001] The invention belongs to the field of optical detection, and relates to a method for generating a grating, in particular to a method for generating a programmable analog grating with a large depth of field. Background technique: [0002] As a bridge between the real world and the virtual digital world, 3D measurement technology plays an increasingly important role. It is widely used in many industries such as industrial inspection, medical health, digital entertainment, e-commerce, cultural relics protection, etc. Due to the advantages of non-contact, high precision and fast speed, optical three-dimensional measurement has developed into the most important technology in the field of three-dimensional inspection. Optical three-dimensional measurement can be divided into two types: active and passive. Passive measurement methods are represented by stereo vision. However, the stereoscopic vision technology system is simple in structure and low in cost...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/2536G02B26/101G02B27/0075G01B11/2518G02B26/0833G02B27/30
Inventor 杨涛金瑞李泉刘涛马力黄军旗
Owner XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com