US 12,560,498 B2Granted

Method and system for determining the state of a sensor whose mechanical behaviour is nonlinear as a function of the amplitude of the pressure exerted

AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives

InventorGhislain Despesse

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Abstract

A method for determining the state of at least one sensor whose mechanical behaviour is nonlinear as a function of the amplitude of the pressure exerted against the sensor, the sensor and an electromechanical transducer being able to be coupled to a support, the method comprising the steps of: applying an electrical signal at a first amplitude to the terminals of the first electromechanical transducer, and determining a first set of values of a parameter characteristic of the electrical impedance of the first electromechanical transducer in response to the application of the electrical signal; applying the electrical signal at a second amplitude to the terminals of the first electromechanical transducer, and determining a second set of values of the parameter characteristic of the impedance; measuring a deviation between the first set of values and the second set of values; determining a state of the sensor as a function of the deviation between the first set of values and the second set of values.

Claims14

Dependent claims

A method for determining the state of at least one sensor whose mechanical behaviour is nonlinear as a function of the amplitude of the pressure exerted against said sensor, said sensor and an electromechanical transducer being in contact with a support, the method comprising the steps of:

applying an electrical signal (Vin) at a first amplitude to the terminals of the electromechanical transducer at different frequencies by means of a sensor state determination unit which comprises a voltage source, or a current source, which is electrically connected to the electromechanical transducer so as to impose respectively a sinusoidal voltage at a predefined maximum amplitude, or a sinusoidal current at a predefined maximum amplitude,
performing a plurality of measurements of the impedance as seen by the electromechanical transducer for said frequencies, and
determining a first set of values (Mod1, Arg1) based on said plurality of measurements;
applying said electrical signal (Vin) at a second amplitude at different frequencies,
performing a plurality of measurements of the impedance as seen by the electromechanical transducer for said frequencies of the signal, and
determining a second set of values (Mod2, Arg2) based on said plurality of measurements of the impedance;
measuring a deviation between the first set of values (Mod1, Arg1) and the second set of values (Mod2, Arg2);
and
determining a state of the sensor as a function of the deviation between the first set of values (Mod1, Arg1) and the second set of values (Mod2, Arg2).

6 more elements

A system for determining the state of at least one sensor whose mechanical behaviour is nonlinear as a function of the amplitude of the pressure exerted against said sensor, said sensor and an electromechanical transducer being in contact with a support, the system comprising a sensor state determination unit, the sensor state determination unit being configured to:

apply an electrical signal (Vin) at a first amplitude to the terminals of the electromechanical transducer at different frequencies by means of a sensor state determination unit which comprises a voltage source, or a current source, which is electrically connected to the electromechanical transducer so as to impose respectively a sinusoidal voltage at a predefined maximum amplitude, or a sinusoidal current at a predefined maximum amplitude,
perform a plurality of measurements of the impedance as seen by the electromechanical transducer for said frequencies, and
determine a first set of values (Mod1, Arg1) based on said plurality of measurements;
apply said electrical signal (Vin) at a second amplitude at different frequencies,
perform a plurality of measurements of the impedance as seen by the electromechanical transducer for said frequencies of the signal, and
determine a second set of values (Mod2, Arg2) based on said plurality of measurements;
measure a deviation between the first set of values (Mod1, Arg1) and the second set of values (Mod2, Arg2);
and
determine a state of the sensor as a function of the deviation between the first set of values (Mod1, Arg1) and the second set of values (Mod2, Arg2).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/072,556Filed 30 Nov 2022
Priority: FR 211442723 Dec 2021
Published: US 2023/0204440 A129 Jun 2023
Granted: 24 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01L 1/2275
Arrangements for correcting or for compensating unwanted effects: for non linearity
G01L 5/243
For determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed: using washers
G01L 1/10
Measuring force or stress, in general: by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
G01L 1/225
Using resistance strain gauges: measuring circuits therefor