US 12,436,000 B2
Capacitive displacement sensor system with interdigitated combs
Stéphane Bouyat, Chatellerault (FR)
Assigned to THALES, Courbevoie (FR)
Appl. No. 18/008,933
Filed by THALES, Courbevoie (FR)
PCT Filed Jun. 9, 2021, PCT No. PCT/EP2021/065395
§ 371(c)(1), (2) Date Dec. 7, 2022,
PCT Pub. No. WO2021/254839, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 2006374 (FR), filed on Jun. 18, 2020.
Prior Publication US 2023/0236039 A1, Jul. 27, 2023
Int. Cl. G01D 5/24 (2006.01); G01B 7/14 (2006.01); G01D 5/241 (2006.01)
CPC G01D 5/2412 (2013.01) [G01B 7/14 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A capacitive displacement sensor system with interdigitated combs, comprising capacitive detection in a direction (y) perpendicular to the surfaces of the combs facing one another, the combs being subjected to a sinusoidal movement (A0.sin (ωt)) in said direction (y), comprising:
a device for converting the capacitance delivered by the sensor into a voltage;
an analog/digital converter configured to digitize the voltage delivered by the device for converting, and supply a digitized signal (Vadc); and
a control unit comprising:
a harmonic estimator configured to estimate the amplitudes of the harmonics of order less than or equal to a maximum order based on the digitized signal (Vadc) and an instantaneous reference angle (α) corresponding to an input; and
a signal reconstruction module for reconstructing a signal from the amplitudes and the instantaneous reference angle that are supplied by the harmonic estimator and from the digitized signal delivered by the analog/digital converter.