Generation method for programmable analog fringe pattern with extended depth of field
US11327297B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2020 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Jul 25, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a generation method for a programmable analog fringe pattern with an extended depth of field. A laser emits a laser beam. After focusing and collimation thereof with a collimating lens, a collimated Gaussian laser beam meeting requirements is obtained. The laser beam is reflected by a mirror once, passes through a round diaphragm and is incident on a MEMS scanning mirror. The beam is reflected by the MEMS scanning mirror to the surface of a tested object. The laser is controlled by a sinusoidal current signal generated by a drive board so as to sinusoidally modulate the brightness of the laser beam. The MEMS scanning mirror is stimulated by a drive signal generated by the drive board to turn two-dimensionally, so as to drive the laser beam to perform scanning, thus generating a fringe pattern image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.