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:
Dec. 15, 2020
Filed:
Feb. 13, 2019
Commissariat a L'energie Atomique ET Aux Energies Alternatives, Paris, FR;
Abstract
An element of a photoacoustic sensor combines an optomechanical resonator and a photoacoustic cavity. The photoacoustic cavity is formed by a measurement chamber, traversed by a pulsed excitation beam. The optomechanical resonator is formed by an optical resonator, a mechanical element for being set in rapid oscillations, by an optical signal confined in the optomechanical resonator, and in slow oscillations, by an acoustic wave generated in the photoacoustic cavity. A measurement beam is sent into the optical resonator, where it carries out several passages via the mechanical element. The optical properties thereof at the output of the optical resonator are therefore dependent on the oscillations of the mechanical element. A low-frequency-amplitude-modulated high-frequency signal can be obtained, with the amplitude modulation representing the acoustic wave in the measurement chamber. An accurate, low-noise, and highly compact method is enabled for making measurements with a photoacoustic effect.