The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2012
Filed:
Mar. 27, 2008
Andras Miklos, Stuttgart, DE;
Judit Angster, Stuttgart, DE;
Andras Miklos, Stuttgart, DE;
Judit Angster, Stuttgart, DE;
Abstract
A method for measuring a photoacoustic signal using light sources that emit light at different wavelengths, wherein the method comprises electing a scanning frequency with which signals are recorded, determining a modulation frequency for each light source by dividing the scanning frequency by an integer division value that is different for each light source, exciting a photoacoustic signal in a photoacoustic measuring cell using the light sources and the modulation frequency, measuring, with a sound pressure sensor, a produced sound pressure, digitizing a signal of the sound pressure sensor, determining a signal component assignable to a respective light source by evaluating a sequence of digitized measured values, and filtering out measured value components that occur periodically with a period of a respective modulation frequency.