Method for full-field measurement using dynamic laser doppler imaging
US10883817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2016 |
| Grant date | Jan 5, 2021 |
| Priority date | — |
| Expiry date | Nov 17, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for full-field measurement using Doppler imaging, comprising the following steps: turning on a laser and adjusting the laser; adjusting a spatial filter to obtain circular laser spots having uniform intensity distribution; adjusting a quarter-wave plate and a whole polarizer in a system, and requiring two beams in a reference object and a measured object having different frequencies and perpendicular polarization directions; applying slight pressure to the measured object, setting a charge coupled device (CCD) camera into a continuous acquisition mode, observing interference fringes, and adjusting a light path so that the fringes are clear and visible; setting the sampling frequency, sampling time, captured image format and resolution size of the CCD camera; turning on a lithium niobate crystal drive power switch to produce a heterodyne carrier frequency; applying continuous equal pushing force to the measured object by means of piezoelectric ceramics (PZT) so as to make the measured object produce continuous bending deformation; controlling the CCD camera to sample using a computer, and collecting a set of time series light interference images along with the continuous de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.