Wireless measurement of temperature using surface acoustic waves sensors

Reindl, Leonhard M.; Shrena, I.

doi:10.1109/tuffc.2004.1367486

Cited by 114 publications

(34 citation statements)

References 4 publications

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“…For the last 20 yr, SAW transducers have also been used as wireless sensors in harsh environments such as for temperature measurements as reported in Reindl and Shrena (2004), Friedt et al (2011), Fachberger et al (2006. They have also been used for torque (Beckley et al, 2002;Kalinin and Brown, 2010), strain (Pohl et al, 1999;Friedt et al, 2012), pressure (Reindl et al, 1998;Buff et al, 1997), chemical (Dong et al, 2001;Wang et al, 2009) and moisture level measurements (Kawalec and Pasternak, 2008).…”

Section: Introductionmentioning

confidence: 99%

Near-field interrogation of SAW resonators on rotating machinery

Boccard

Katus

Renevier

et al. 2013

J. Sens. Sens. Syst.

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Abstract. Surface acoustic wave (SAW) resonators electrically behave like LCR circuits, their frequency can be influenced by temperature, pressure and torque. When they are used for passive wireless sensing on rotating machinery, they can also be influenced by the angular variations of the coupling between the coupler elements and the receiving coupler element impedance. This parasitic frequency shift is known as the "pulling effect". In this paper, we present a capacitive coupler based on open coplanar strip lines for physical measurements on a small diameter rotating shaft. This approach allows a single 434 MHz resonator angular frequency pulling lower than 200 Hz (0.46 ppm) and 100 Hz (0.23 ppm) in a differential configuration. This is more than 10 times lower compared to frequency pulling obtained using couplers based on circular and electrically shorted transmission lines. RADAR-based interrogation, finite element method (FEM) simulation, coupler parameters and frequency pulling measurements results are presented to demonstrate the performances of the complete system.

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Section: Introductionmentioning

confidence: 99%

Near-field interrogation of SAW resonators on rotating machinery

Boccard

Katus

Renevier

et al. 2013

J. Sens. Sens. Syst.

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show abstract

“…Currently existing SAW tag products use the so called time position encoding (Plessky et al, 1995;Stierlin & Küng, 2002), which represents the most straightforward way of data encoding in SAW tags. This is the only method currently used in commercial SAW tags (Reindl & Shrena, 2004;Stelzer et al, 2004). In this encoding scheme, the total time delay is divided into slots of certain duration.…”

Section: Time Position Encodingmentioning

confidence: 99%

Surface Acoustic Wave RFID Tags

Harma¹,

Plessky²

2009

Development and Implementation of RFID Technology

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“…we concluded that (1) all of the device parameters had good impedance matching with the propagating SAW, due to very precise device patterning obtained using the EBL, (2) c. Sensitivity evaluation A mechanical compression force was applied to the diaphragm by placing an object at its center, and then the S 11 parameter was measured by the Network analyzer, and the time deviation of the reflected peaks, Δτ, as function of the amount of applied mechanical force was extracted using a parabolic approximation [11]. The phase shifts of the reflected peaks Φ i were obtained from the relation: Φ i = 2πf×Δτ (i=1,2,3).…”

Section: B Wireless Electrical Measurementmentioning

confidence: 99%