Commissariat a L'energie Atomique Et Aux Energies Alternatives

François Gardien

Laurent Frey

Laurent Mollard

Christel Dieppedale

Bruno Fain

Jean Hue

François Blard

An acoustic, preferably ultrasonic, wave emission and/or reception device, including a wave emitter configured to transmit waves at an emission frequency, and a receiver of preferably ultrasonic waves, separate from the emitter, having a resonance frequency, and configured to receive waves generated by the emitter and including direct waves and reflected waves, wherein the device includes a resonance frequency modulator of the receiver and a control unit configured to control the resonance frequency modulator during a predetermined time period, so as to reduce the sensitivity of the receiver during the predetermined time period by moving the resonance frequency of the receiver away from the emission frequency of the emitter. The acoustic device relates to the field of ultrasonic sensors, particularly PMUTs or CMUTs, having a high quality factor.

Variable resonance frequency acoustic wave emission and/or detection device

A reflector device reflects luminous radiation of wavelength λ. The device is provided with a supporting base whereon are assembled a partially transparent mirror having a partially reflective front face and luminous radiation scattering and/or absorption structure to scatter and/or absorb luminous radiation liable to be transmitted by a rear face, opposite the front face.

Reflective device

Growing community of inventors

Grenoble, France

François Gardien