Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Université Grenoble Alpes

Institut Polytechnique De Grenoble

Centre National De La Recherche Scientifique

Commissariat a L'energie Atomique

Cnrs

Alain Gliere

Jean-Guillaume Coutard

Sergio Nicoletti

Justin Rouxel

Salim Boutami

Skandar Basrour

Guillaume Laffont

Thomas Lauwers

Laurent Duraffourg

Jean-Marc Dinten

Pierre Labeye

Mickaël Brun

Corinne Mestais

Maryse Fournier

Anne Koenig

Alexandre Teulle

The invention relates to a device and method for detecting an acoustic wave propagating toward a membrane, the membrane carrying a waveguide comprising an optical cavity defining a resonant frequency. Under the effect of a vibration of the membrane, the resonance frequency of the optical cavity varies. The device includes a light source for directing a light wave into the optical cavity, and a servo circuit for servo-controlling the wavelength of the light wave to the resonant wavelength of the optical cavity. Monitoring the variation in the wavelength of the light wave allows an amplitude of the acoustic wave to be estimated.

Optical device for detecting an acoustic wave

The invention is a device and method for detecting an analyte in a medium. An exciting light source produces an exciting light wave, which propagates to the medium and heats the latter. The device comprises a transducer for detecting the heating of the medium. According to one embodiment, the transducer is a thermal transducer, configured to detect a variation in the temperature of the medium. According to another embodiment, the transducer is an acoustic transducer, configured to detect a photoacoustic wave propagating from the medium. Whatever the embodiment, the transducer employs a membrane, on which a waveguide is placed. The waveguide comprises a resonant optical cavity. Transduction is achieved by analyzing a variation in a resonant wavelength of the optical cavity.

Photoacoustic or photothermal detector comprising an optical transducer

A photoacoustic detecting device to be applied, via a contact face, against a medium to be analyzed, is disclosed. The device includes: a hollow cavity that opens onto a contact aperture, the contact aperture being produced in the contact face; a pulsed or amplitude-modulated light source configured to emit, when activated, an incident light beam, in an emission spectral band, through the cavity, to the contact aperture; and an acoustic transducer connected to the cavity and configured to detect a photoacoustic wave extending through the cavity. Under the effect of illuminating the medium by the incident light beam, the acoustic transducer detects an acoustic wave produced by heating the medium. The cavity includes a membrane extending through the cavity, facing the contact face. The membrane is bounded by a lower face and an upper face. The membrane includes through-apertures produced between the lower face and the upper face.

Photoacoustic detecting device comprising a protective membrane

Photoacoustic detecting device (), intended to be applied, via a contact face (), against a medium to be analysed, the device comprising: The photoacoustic detecting device is optimized to increase the amplitude of the photoacoustic wave detected by the acoustic transducer.

Device for detecting an analyte via photoacoustic detection

A photoacoustic device for detecting gas includes a photoacoustic cavity having a side wall extending between a first end and a second end and having an outer surface; a light source suitable for emitting a modulated light radiation, and coupled to the first end; a microphone coupled to the side wall, the photoacoustic cavity being made of a material transparent to the light radiation of the light source; a mirror being arranged on at least one portion of the outer surface of the side wall; and the side wall having a thickness chosen as a function of the depth of penetration &#x3b4; of a thermal wave coming from the mirror into the transparent material.

Photoacoustic device for detecting gas and method for manufacturing such a device

A source () that includes a membrane, where the membrane includes: an emissive layer () including an emissive surface (); an adaptor (), each adaptor () facing a different section of the emissive section (), called the emissive section (), and with which it forms an emissive assembly () adapted to reduce the spectral extent of infrared radiation emitted by the emissive section; and a plurality of heaters () for heating the emissive layer (), the heaters () being arranged so as to impose different relative temperature variations in different emissive sections ().

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Grenoble, France

Alain Gliere