US 12,076,279 B2
Ultrasonic object detection
Jean-Pierre Nikolovski, Grenoble (FR)
Assigned to COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Appl. No. 17/258,949
Filed by COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
PCT Filed Jul. 9, 2019, PCT No. PCT/FR2019/051702
§ 371(c)(1), (2) Date Jan. 8, 2021,
PCT Pub. No. WO2020/012110, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 1856357 (FR), filed on Jul. 10, 2018.
Prior Publication US 2021/0121331 A1, Apr. 29, 2021
Int. Cl. A61F 9/08 (2006.01); A61F 9/00 (2006.01); G01S 7/521 (2006.01); G01S 7/52 (2006.01); G01S 15/93 (2020.01)
CPC A61F 9/08 (2013.01) [A61F 9/00 (2013.01); G01S 7/521 (2013.01); G01S 7/5208 (2013.01); G01S 15/93 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An ultrasonic object detection device including at least two independent transducers capable of emitting at least two ultrasonic signals, respectively, to produce as feedback reflected ultrasonic signals, and capable of receiving the reflected ultrasonic signals, comprising:
an electronic processing unit configured to:
convert the reflected ultrasonic signals received into corresponding spectrograms, within an audible frequency band, and
form corresponding audible time signals by inverse Fourier transform of the spectrograms,
wherein each of the least two independent transducers comprises a dual-frequency, triple-radiation-diagram, triaxial transducer comprising:
an annular metal resonator with central narrowing with a cylindrical shoulder, and
two annular-shaped piezoelectric ceramics arranged on either side of the metal resonator, one for causing a vibration of the cylindrical shoulder according to the axis of symmetry thereof, and the other for causing vibrations according to two axes that are mutually perpendicular and perpendicular to the axis of symmetry of the cylindrical shoulder.