Optical acoustic sensing system and method
US12146808B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2018 |
| Grant date | Nov 19, 2024 |
| Priority date | — |
| Expiry date | Sep 28, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring the state or condition of spatially spaced apart machine parts subject to wear and emitting an acoustic signature. The method includes: (a) optically sensing the acoustic properties of the machine parts subject to wear, and deriving sensed signals there from, (b) dividing the sensed signals into a first series of corresponding spatial segments along the spaced apart machine parts and, for each spatial segment, dividing the sensed signal into a temporal segment recording the acoustic properties for the spatial segment over an extended time period; (c) dividing each temporal segment into a series of sub-segments and frequency domain transforming the sub-segments into corresponding frequency domain sub-segments; (d) combining the frequency domain sub-segments within a spatial segment, to produce a corresponding lower noise level combined frequency domain sub segment; and (e) determining the fundamental frequency of the emitted acoustic signatures present in the combined frequency domain sub segment, and associated harmonics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.