Radio-interrogated surface-wave technology sensor
First Claim
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1. A sensor arrangement, comprising:
- a surface-wave arrangement having surface-wave structures and an antenna;
a sensitive impedance element as a sensor part, said sensitive element being a resistive element, the resistive element being a photoresistor;
a radio frequency transmitter and receiver with radio antenna and electronic evaluation device;
the impedance element, which is exposable to an effect to be detected by the sensor part, being electrically connected to at least one of the surface-wave structures; and
the transmitter being structured for radio transmission of an interrogation pulse and the receiver with its evaluation device being structured for radio reception and for qualitative/quantitative evaluation of a change, influenced by the effect on the impedance element, in the impulse response of the surface-wave arrangement.
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Abstract
Radio-interrogated surface-wave technology sensor, in which the sensitive element (12) is an impedance which is electrically connected as termination to a surface-wave structure (26) of the sensor.
76 Citations
2 Claims
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1. A sensor arrangement, comprising:
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a surface-wave arrangement having surface-wave structures and an antenna; a sensitive impedance element as a sensor part, said sensitive element being a resistive element, the resistive element being a photoresistor; a radio frequency transmitter and receiver with radio antenna and electronic evaluation device; the impedance element, which is exposable to an effect to be detected by the sensor part, being electrically connected to at least one of the surface-wave structures; and the transmitter being structured for radio transmission of an interrogation pulse and the receiver with its evaluation device being structured for radio reception and for qualitative/quantitative evaluation of a change, influenced by the effect on the impedance element, in the impulse response of the surface-wave arrangement.
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2. A sensor arrangement, comprising:
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a surface-wave arrangement having surface-wave structures and an antenna; a sensitive impedance element as a sensor part, the sensitive element being a variable-capacitance diode; a radio frequency transmitter and receiver with radio antenna and electronic evaluation device; the impedance element, which is exposable to an effect to be detected by the sensor part, being electrically connected to at least one of the surface-wave structures; and the transmitter being structured for radio transmission of an interrogation pulse and the receiver with its evaluation device being structured for radio reception and for qualitative/quantitative evaluation of a change, influenced by the effect on the impedance element, in the impulse response of the surface-wave arrangement.
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Specification
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Current AssigneeSiemens AG
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Original AssigneeSiemens AG
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InventorsOstertag, Thomas, Scholl, Gerd, Ruile, Werner, Reindl, Leonhard, Magori, Valentin
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Primary Examiner(s)Zimmerman, Brian
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Assistant Examiner(s)Dalencourt, Yves
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Application NumberUS08/945,294Time in Patent Office991 DaysField of Search340/825.54, 340/870.3, 340/870.16, 340/664, 340/572.1, 324/96, 324/117 R, 324/117 H, 324/127, 324/239, 324/252, 310/313 R, 310/313 BUS Class Current340/10.1CPC Class CodesG01S 13/755 using delay lines, e.g. aco...
