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

• US 20030102984A1
• Filed: 11/01/2002
• Published: 06/05/2003
• Est. Priority Date: 05/23/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Elsner, Bernhard, Heidemeyer, Henry
• Granted Patent: US 6,897,775 B2
• Time in Patent Office: Days
• US Class Current: 340/870.16
• CPC Class Codes: G01S 13/753 using frequency selective elements, e.g. resonator
• CPC Class Codes: G08C 17/02 using a radio link

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.

Claims