Laser shock peening quality assurance by acoustic analysis
US6629464B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 3, 2001 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Dec 19, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0426
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for quality control monitoring of laser shock peening a surface of a production workpiece during which laser beam pulses form a plurality of corresponding plasmas. An acoustic signal of each laser beam pulse during a period of time during a duration of each corresponding one of the plasmas is monitored and an acoustic energy parameter value for each of the acoustic signals for each of the corresponding laser pulses is calculated. A statistical function value of the workpiece based on the acoustic energy parameter values is calculated and compared to a pass or fail criteria for accepting or rejecting the workpiece. The criteria may be based on a pre-determined correlation of test piece statistical function data such as high cycle fatigue failure data of test pieces. The statistical function value may be an average of the acoustic energy parameter values of the laser beam pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.