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

Photoelasticity test system and method based on optical amplification technology

An optical amplification and testing system technology, which is applied in optics, optical components, and the measurement of the change force of the optical properties of the material when it is stressed, can solve the problem of high stress in material damage, indistinguishable number of stripes, concentration, etc. question

Inactive Publication Date: 2021-07-06
CHINA UNIV OF MINING & TECH (BEIJING)
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the laser is used as the light source for photoelasticity testing, although the number of isocline fringes is increased and the accuracy of stress calculation is improved, the material fringe value of some photoelastic materials is low, especially when the laser is used as the light source, it is easy to appear There are too many series of fringes that cannot be distinguished, or there are small damages inside the material that cause high stress concentration and the fringes are too fine to be distinguished

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
  • Photoelasticity test system and method based on optical amplification technology
  • Photoelasticity test system and method based on optical amplification technology
  • Photoelasticity test system and method based on optical amplification technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the photoelasticity testing system based on optical amplification technology in this embodiment includes a laser output unit 1 for providing the light source required for the field of view, and the first lens is sequentially arranged along the optical path direction output by the laser output unit 1 from front to back. group, photoelasticity test unit, second lens group and image acquisition unit 11. Among them: the first lens group is used to expand and collimate the beam at the exit of the laser output unit; the photoelastic test unit includes a polarizer 4, a first λ / 4 wave plate 5, a loading unit 6, a second The λ / 4 wave plate 7 and the analyzer 8 are used to realize the photoelastic optical path to obtain the arithmetic fringes; the second lens group is used to amplify the image, and the image acquisition unit is used to take the photoelastic image.

[0036] The optical path of the photoelastic test of the present invention is arranged a...

Embodiment 2

[0053] This embodiment provides a method for distinguishing fine and dense photoelastic arithmetic fringes, and the device is set up from front to back: laser output unit, first concave lens, first convex lens, polarizer, first λ / 4 wave plate, loading unit , the second λ / 4 wave plate, the analyzer, the second concave lens, the second convex lens and the CCD camera, and make the centers of each device be located at the same height of a straight line; adjust the frequency of the laser output device to make it and the CCD camera The frequencies are the same, and the beam expanded by the first lens group completely covers the object to be tested; the polarization direction of the polarizer is adjusted, and the fast and slow axes of the first λ / 4 wave plate and the second λ / 4 wave plate are adjusted to The angle between the polarizing directions of the polarizer and the analyzer is 45°; turn on the laser output unit, and place the test piece loaded on the loading unit in the optical...

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 photoelasticity test system and method based on an optical amplification technology, and the system comprises: a laser output unit which is used for providing a light source needed by a field of view, and a first lens group, a photoelasticity test unit, a second lens group and an image collection unit which are sequentially arranged from front to back in the direction of a light path outputted by the laser output unit. The first lens group is used for collimating and expanding a laser light source; the photoelasticity test unit is used for realizing a photoelasticity light path to obtain equal-difference stripes and comprises a polarizer, a first lambda / 4 wave plate, a loading unit, a second lambda / 4 wave plate and an analyzer which are arranged in sequence; the second lens group is used for amplifying the image; and the image acquisition unit is used for shooting a photoelastic image. According to the invention, the fringes are distinguished by using an optical amplification principle, and the problem that fine fringes appearing at a higher stress position of a photoelastic material with a low material fringe value during a laser photoelastic test cannot be distinguished can be solved by adjusting the configuration of the second concave lens and the second convex lens.

Description

technical field [0001] The invention belongs to the field of optical imaging and engineering flaw detection, in particular to a photoelastic testing system and method based on optical amplification technology. Background technique [0002] Birefringence refers to the phenomenon that one incident ray produces two refracted rays. Some amorphous materials that are originally optically isotropic (such as epoxy resin, plexiglass, polycarbonate, etc.) have no birefringence when they are not subjected to external forces, but when they are subjected to external forces, they show optical anisotropy , birefringence occurs; when the external force is removed, the original isotropy is restored, this phenomenon is called temporary birefringence. Photoelasticity is a full-field photomechanical technique based on the principle of birefringence. As a classic mechanical testing method, photoelasticity testing is widely used in mechanical analysis because of its full-field and real-time anal...

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): G01L1/24G02B27/28
CPCG01L1/241G02B27/286
Inventor 李德建张鸣原陈露李英骏
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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