Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
2008-01-08
2009-10-20
Toatley, Jr., Gregory J (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C356S440000, C356S317000
Reexamination Certificate
active
07605922
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.
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European Search Report for corresponding Application No. 07 01 4498 dated Nov. 22, 2007.
Kosterev Anatoliy et al.; “Applications of 1-10 quartz tuning forks in spectroscopic gas sensing”; Review of Scientific Instruments, American Institute of Physics, U.S., vol. 76, No. 4, Mar. 23, 2005, pp. 43105-43105; XP012079295.
Kohli Markus
Seifert Andreas
Willing Bert
IR Microsystems SA
Renner , Otto, Boisselle & Sklar, LLP
Toatley Jr. Gregory J
Underwood Jarreas C
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