Sensor, sensor system, and method for remotely sensing a variable

US6897775B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernhard Elsner · Bad Berka, DE
• Henry Heidemeyer · Ditzingen, DE

Key dates

• Filing date: Apr 5, 2001
• Grant date: May 24, 2005
• Expiry date: Jul 2, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/753
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor system for remote detection of a measurable variable includes a sensor, with a first resonator (5) which has a resonant frequency that is variable under the influence of the measurable variable; an antenna (1) for sending and receiving a modulated high-frequency signal; a modem (2) for coupling the first resonator (5) to the antenna; and a second resonator (3) that can be excited by a carrier frequency of the high-frequency signal. An interrogation unit generates an inquiry radio signal for exciting the two resonators and interrupts the broadcasting of the inquiry radio signal in order to receive a response radio signal broadcast by the sensor.