Combined vapor and/or gas concentration sensor and switch

A combined vapor and/or gas concentration sensor and switch includes a resonating structure, a first alternating current, AC, voltage source coupled to a drive electrode, the first AC voltage source providing the resonating structure with a first voltage having an amplitude causing a first vibration...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Jaber, Nizar, Younis, Mohammad Ibrahim
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A combined vapor and/or gas concentration sensor and switch includes a resonating structure, a first alternating current, AC, voltage source coupled to a drive electrode, the first AC voltage source providing the resonating structure with a first voltage having an amplitude causing a first vibration mode of the resonating structure to exhibit a pull-in band and having a first frequency response adjacent to the pull-in band, where the first frequency response is nonlinear, a second AC voltage source coupled to the drive electrode and providing a second voltage having a frequency so that a second frequency response of the resonant structure, adjacent to a third vibration mode, is linear, and a read-out circuit coupled configured to determine a vapor and/or gas concentration based on a difference between (1) the frequency of the second voltage and (2) a frequency obtained by the read-out circuit from the resonating structure.