US 12,216,865 B2
Contactless element detection device
Pierre-Henri Orefice, Gif sur Yvette (FR); and Charles Hudin, Gif sur Yvette (FR)
Assigned to COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Appl. No. 18/254,481
Filed by COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
PCT Filed Nov. 24, 2021, PCT No. PCT/FR2021/052080
§ 371(c)(1), (2) Date May 25, 2023,
PCT Pub. No. WO2022/112712, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 2012214 (FR), filed on Nov. 26, 2020.
Prior Publication US 2024/0053854 A1, Feb. 15, 2024
Int. Cl. G06F 3/043 (2006.01); G01R 23/02 (2006.01); G01S 15/87 (2006.01); G06F 3/01 (2006.01)
CPC G06F 3/043 (2013.01) [G01R 23/02 (2013.01); G01S 15/876 (2013.01); G06F 3/017 (2013.01); G06F 2203/04108 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A contactless detection device, comprising:
a detection surface;
a plurality of actuators acoustically coupled to the detection surface and configured to emit ultrasonic acoustic waves;
an ultrasonic acoustic wave detector; and
processing circuitry;
wherein the device is configured to perform detection of one or more elements by implementing the following steps a plurality of times:
focusing detection ultrasonic acoustic waves emitted by the plurality of actuators via the detection surface into a focusing region belonging to a plane located opposite and away from the detection surface, by applying on the plurality of actuators, control signals calculated by the processing circuitry from a measurement of an audio impulse response and/or a vibratory impulse response of the detection surface that was generated by an emission of ultrasonic calibration acoustic waves by each of the plurality of actuators, and application of a first time reversal method to the audio impulse response and/or to the vibratory impulse response of the detection surface, and
measuring a duration between the emission of the detection ultrasonic acoustic waves and a reception of an echo of the detection ultrasonic acoustic waves by the ultrasonic acoustic wave detector,
wherein the processing circuitry is further configured to calculate the control signals such that the detection ultrasonic acoustic waves are focused successively into focusing regions having different shapes and/or dimensions.