METHOD AND GAS SENSOR FOR PERFORMING QUARTZ-ENHANCED PHOTOACOUSTIC SPECTROSCOPY
First Claim
1. A method for performing quartz-enhanced photoacoustic spectroscopy of a gas, comprisingproviding 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, andproviding 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.
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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.
17 Citations
10 Claims
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1. A method for performing quartz-enhanced photoacoustic spectroscopy of a gas, comprising
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.
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7. A photoacoustic gas detector for performing quartz-enhanced photoacoustic spectroscopy comprising
a light source for providing a laser beam, a detection region provided for receiving at least one sample gas, at least one tuning fork serving as resonant acoustic detector and providing a resonant absorption signal (SA), processing means for providing a signal relative to the presence or concentration of a given gas in said detection region.
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8. A photoacoustic gas detector comprising
a light source for providing a laser beam, a detection region provided for receiving at least one sample gas, at least one first tuning fork serving as resonant acoustic detector and providing a resonant absorption signal (SA), processing means for providing a signal (SGC) relative to the presence or concentration of a given gas in said detection region, at least one second tuning fork arranged in series to and preferably behind said at least first tuning fork, said at least one second tuning fork serving as resonant acoustic detector for providing a resonant signal relative to the intensity of the laser beam travelling through said sample gas.
Specification