公开(公告)号：US20230112323A1

公开(公告)日：2023-04-13

申请号：US17914258

申请日：2021-03-08

Applicant: OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES

Inventor： Raphael LEVY ,  Thomas PERRIER ,  Pierre LAVENUS ,  Jean GUERARD ,  Vincent GAUDINEAU

IPC: H03B5/32 ,  H03H9/215 ,  G01R29/12 ,  H10N30/85

Abstract: An electrical field detector includes an electromechanical oscillator, part of which is included of a piezoelectric element, a frequency measuring device which is coupled to the oscillator so as to measure the oscillation frequency, and an electrical masking assembly. The electrical masking assembly is arranged close to the piezoelectric element so that, during an use of the detector, the piezoelectric element moves by vibrating relative to the electrical masking assembly. A variable part of the piezoelectric element is thus exposed to the electrical field to be measured. A change in the oscillating frequency then forms an electrical field measurement result.

公开(公告)号：US20200041462A1

公开(公告)日：2020-02-06

申请号：US16339552

申请日：2017-09-26

Applicant: OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES

Inventor： Raphael LEVY ,  Guillaume AOUST ,  Béatrice VERLHAC ,  Jean GUERARD ,  Olivier LE TRAON ,  Vincent GAUDINEAU

IPC: G01N29/34 ,  G01N21/17 ,  G01N29/24

Abstract: An electric measurement circuit possesses an electrical reaction leg for forming an oscillator from a resonator, and furthermore possesses a measurement leg the input of which is supplied by the electrical reaction leg. The measurement leg contains an adjustable phase shifter so that an additional excitation force that is applied to the resonator in the measurement leg can be adjusted in phase quadrature with respect to an excitation force that is applied to the resonator in the electrical reaction leg. Such an electrical measurement circuit is particularly suitable for forming a photoacoustic gas detector.