Passive surface wave sensor which can be wirelessly interrogated

Details Passive surface wave sensor which can be wirelessly interrogated Passive surface wave sensor which can be wirelessly interrogated

1994-07-05

2000-11-07

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

340 101, 34082572, G01S 1302

Patent

active

061443328

ABSTRACT:
In a passive surface wave sensor for measured value determination, a measured value is transmitted by radio from a remote measuring location to an interrogation device, which transmits energy by radio to a sensor element as an interrogation pulse. The surface wave sensor is suitable for contactless measured value acquisition. A surface wave configuration is the sensor element and a surface wave reference element is provided for phase discrimination and/or propagation time measurement. As a further development, a sensor operated with chirped transmitting signals and having chirped reflectors is provided, in which the configuration has a reference function in place of the reference element. A sensor constructed in such a way that it has a chirped function has the characteristics of an imminently temperature-compensated sensor for measuring other physical or similar variables.

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patent: 4951057 (1990-08-01), Nagel
"Surface acoustic-wave . . . ", Bowers et al., Review of Scientific Instrument, Jul. 1989, No. 7, pp. 1297-1302.
"Measurement of Saw Velocity", Cullen et al., 1975 Symposium Proceedings, IEEE, pp. 519-522.
"Surface-Acoustic-Wave Pressure and Temperature . . . ", Reeder et al., Proceedings of the IEEE, pp. 754-756.

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