PROCEDE D'INTERROGATION D'UN CAPTEUR DIFFERENTIEL DE TYPE ACOUSTIQUE A DEUX RESONANCES ET DISPOSITIF METTANT EN OEUVRE LE PROCEDE D'INTERROGATION

The method involves transmitting an electromagnetic signal having a variable frequency, and collecting an echo signal received after a predetermined time. The echo signal is transpositioned by mixing with a radio frequency signal whose frequency is equal to the frequency of the electromagnetic signa...

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Bibliographische Detailangaben
Hauptverfasser:	DROIT CHRISTOPHE, BALLANDRAS SYLVAIN, MARTIN GILLES, FRIEDT JEAN-MICHEL
Format:	Patent
Sprache:	fre
Schlagworte:	MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE PHYSICS TESTING THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Beschreibung
Zusammenfassung:	The method involves transmitting an electromagnetic signal having a variable frequency, and collecting an echo signal received after a predetermined time. The echo signal is transpositioned by mixing with a radio frequency signal whose frequency is equal to the frequency of the electromagnetic signal, and the mixed signal is filtered for eliminating high frequencies. A difference between frequencies of resonance of two resonators is determined from a maximum cross-correlation characteristic of the level of echo signal for each sub-band according to the frequency of the electromagnetic signal. An independent claim is also included for an interrogation device for interrogating a sensor.