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:
Mar. 10, 2026
Filed:
Dec. 13, 2021
Mirsense, Palaiseau, FR;
Mathieu Carras, Saint Nazaire, FR;
Guillaume Aoust, Massy, FR;
MIRSENSE, Palaiseau, FR;
Abstract
A device for measuring the power and wavelength of laser radiation via the photoacoustic effect, includes a cell containing at least one gas having an absorption line with a central wavelength λ, an electro-acoustic transducer arranged within the cell and suitable for generating a signal representative of the photoacoustic signal in the cell, means for processing the signal generated by the electro-acoustic transducer, wherein an estimate of the concentration of the one or more gases is stored, at least one laser source suitable for emitting, into the cell, laser radiation at a wavelength suitable for exciting at least one gas contained in the cell, the laser radiation having a wavelength that is variable in an oscillatory manner about an average wavelength λat a modulation frequency (f), such that an interaction between the laser radiation and at least one gas contained in the cell induces generation of a photoacoustic signal at a detection frequency of the electro-acoustic transducer, the cell being sealed by a membrane so as to be impermeable to the one or more gases contained in the cell and having an optical aperture transparent to the laser radiation, the processing means being configured to determine a variation in the phase Φ(t) of the photoacoustic signal based on the photoacoustic signal, the processing means being suitable for measuring the wavelength of the radiation based on the photoacoustic signal.