Method and gas sensor for performing quartz-enhanced photoacoustic spectroscopy
US7605922B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2008 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | Jun 7, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/274
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for performing quartz-enhanced photoacoustic spectroscopy of a gas, includes providing a light source configured to introduce a laser beam having at least one wavelength into the gas such said at least one molecule within in the gas is stimulated generating an acoustic signal, accumulating the acoustic signal in a resonant acoustic detector, generating a resonant absorption signal (SA) relative to the gas concentration by at least one tuning fork serving as resonant acoustic detector, generating additionally a resonant intensity signal (SI) proportional to the intensity of the laser beam travelling through the gas, and providing an output signal (SGC) from said absorption signal (SA) and said intensity signal (SI) being independent of the intensity of the light relative to the presence or concentration of the gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.