Acoustic resonance frequency locked photoacoustic spectrometer
US6618148B1 · kind B1 · utility
34Cited by
10References
25Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 12, 2001 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Feb 12, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/1704
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell, the acoustic source having a source frequency; repeatedly and continuously sweeping the source frequency across the resonance frequency at a sweep rate; and employing an odd-harmonic of the source frequency sweep rate to maintain the source frequency sweep centered on the resonance frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.