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Working principle description of the wireless passive EM transduction pressure sensor

Published online by Cambridge University Press:  28 September 2011

M.M. Jatlaoui ,
F. Chebila ,
P. Pons  and
H. Aubert
M.M. Jatlaoui*
Affiliation:
CNRS-LAAS, 7 avenue du Colonel Roche, 31077 Toulouse, France
F. Chebila
Affiliation:
CNRS-LAAS, 7 avenue du Colonel Roche, 31077 Toulouse, France University of Toulouse, UPS, INSA, INP, ISAE, LAAS, 31077 Toulouse, France
P. Pons
Affiliation:
CNRS-LAAS, 7 avenue du Colonel Roche, 31077 Toulouse, France
H. Aubert
Affiliation:
CNRS-LAAS, 7 avenue du Colonel Roche, 31077 Toulouse, France University of Toulouse, UPS, INSA, INP, ISAE, LAAS, 31077 Toulouse, France
*
ae-mail: mjatlaou@laas.fr
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Abstract

The development of a new passive wireless pressure sensor, based on an electromagnetic transduction approach, is reported. The sensing element is a flexible high resistivity silicon membrane located above a coplanar quarter-wavelength resonator. The comprehensive coverage of the physical bases is beyond the scope of this paper. For the remote extraction of the applied pressure value, the passive pressure sensor is connected to a broadband horn antenna via a coaxial delay line. When interrogated by a frequency modulated continuous wave radar, the level of the backscattered signal changes versus the pressure applied to the proof body. Through this interrogation principle, the sensor provides load impedance that is reflected back to the radar reader: the measured dynamic is about 0.8 dBm/bar. This completely passive and wireless pressure telemetry micro-sensor has been designed, fabricated and characterized, thereby eliminating the need for contact, signal processing circuits, and power supplies needed by conventional active sensors.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 56 , Issue 1: Topical Issue: 5th Colloquium Interdisciplinary in Instrumentation (C2I) 2010 , October 2011 , 13702
Copyright
© EDP Sciences, 2011

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