Acoustic resonance phase locked photoacoustic spectrometer
US6608683B1 · kind B1 · utility
28Cited by
7References
17Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 12, 2001 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Mar 20, 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 to generate a photoacoustic signal, the acoustic source having a source frequency; continuously measuring detection phase of the photoacoustic signal with respect to source frequency or a harmonic thereof; and employing the measured detection phase to provide magnitude and direction for correcting the source frequency to the resonance frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.