Photoacoustic excitation sensing enhanced by cross-correlated unfocused speckle images
US11692810B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2018 |
| Grant date | Jul 4, 2023 |
| Priority date | — |
| Expiry date | Feb 27, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0289
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a system for photoacoustic inspection of a part are provided herein. The method may include the following steps: photo-acoustically exciting a predetermined position in a predetermined region on a part by pulsed laser illumination, to yield ultrasonic excitation of the part; coherently illuminating a predetermined location in the predetermined region on the part; detecting an illumination scattered from the predetermined location; determining, based on the scattered illumination, a plurality of sequence of two or more temporally-sequential de-focused speckle pattern images, wherein each of the sequences corresponds to one of the predetermined illuminated locations; and determining a set of translations, each determined based on the sequences, wherein each translation in the set is determined based on two temporally-sequential speckle patterns images in the respective sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.