Wireless sensing using oscillator circuits locked to remote high-Q SAW resonators

Pohl, A.; Ostermayer, Gerald; Seifert, F.

doi:10.1109/58.726439

Cited by 68 publications

(31 citation statements)

References 4 publications

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“…After the interrogator switching off the charge power, the signals at and close to the resonance frequency f 0 are delivered from the SAW resonator to the connected antenna and decay with a time constant, the rest fades away. 10 The duration of the response is transient and only lasts for a very short time, which is related with the quality factor (Q) of the SAW resonator. Thus, the RF SAW response y(t) off is expressed as: 4 …”

Section: Effective Saw Response Detection Methodsmentioning

confidence: 99%

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A surface acoustic wave response detection method for passive wireless torque sensor

Fan

Kong

et al. 2018

AIP Advances

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This paper presents an effective surface acoustic wave (SAW) response detection method for the passive wireless SAW torque sensor to improve the measurement accuracy. An analysis was conducted on the relationship between the response energy-entropy and the bandwidth of SAW resonator (SAWR). A self-correlation method was modified to suppress the blurred white noise and highlight the attenuation characteristic of wireless SAW response. The SAW response was detected according to both the variation and the duration of energy-entropy ascension of an acquired RF signal. Numerical simulation results showed that the SAW response can be detected even when the signal-to-noise ratio (SNR) is 6dB. The proposed SAW response detection method was evaluated with several experiments at different conditions. The SAW response can be well distinguished from the sinusoidal signal and the noise. The performance of the SAW torque measurement system incorporating the detection method was tested. The obtained repeatability error was 0.23% and the linearity was 0.9934, indicating the validity of the detection method.

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Section: Effective Saw Response Detection Methodsmentioning

confidence: 99%

“…In general, Q can be defined as: Q = f 0 /B r , 10 where B r is the bandwidth of SAWR. Thus, for an acquired SAW signal, Eq.…”

Section: Effective Saw Response Detection Methodsmentioning

confidence: 99%

A surface acoustic wave response detection method for passive wireless torque sensor

Fan

Kong

et al. 2018

AIP Advances

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“…11 noch einmal herangezogen: Fª die Abfrage von Resonatoren und Sensoren vom ID-tag-Typus wird die Phase entlang ~-Max-Kreisen der miteinander zu vergleichenden Reflexionsimpulse genau gemessen. Unsere Arbeiten in den letzten Jahren haben hier zu gut geeigneten Methoden gefª [12,15,18,19,21,24,25]. Diese Erfahrungen fehlen noch fª die Abfrage externer konventioneller Sensoren [28], die an Verz6gerungsleitun-gen angeschlossen sind.…”

Section: Diskussion Der Abfrageverfahrenunclassified

Drahtlose Abfrage von Oberflächenwellen-Identifikationsmarken und Meßwertwandlern

Seifert

Pohl

Reindl

et al. 1998

Elektrotech. Inftech.

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Dem lang]iihrigen Leiter des Forschungslaboratoriums Siemens MªNeuperlach, Herrn Professor zum 75. Geburtstag gewidmet. Es wird die drahtlose Abfrage von drei verschiedenen Typen von passiven Oberfl~i-chenwellen-(OFW-)Identifikationsmarken und Megwertwandlem beschrieben, die alle an eine kleine Antenne fª den Empfang des Abfragesignals und die Rª lung der verz6gerten Antwort angeschlossen sind. (1) Die Abklingfrequenz von OFW-Resonatoren wird w~ihrend mehrerer Mikrosekunden ª eine getastete Phasenregelschleife (PLL) bestimmt. (2) Der Abstand zwischen einigen Antwortimpulsen einer OFW-Laufzeitleitung, die durch akustische Reflektoren in verschiedenen Abst~inden entstehen, wird mit drei verschiedenen integrativen Auswerteverfahren genau gemessen. (3) Die Amplitude des Antwortimpulses wird voto Wert einer an die OFW-Laufzeitstrecke angeschlossenen Kapazit~it bestimmt und ausgewertet. Alle Verfahren dienen der drahtlosen Abfrage fester und einstellbarer Identifikationscodes sowie von Megwerten fª Temperatur, Druck, Kraft, Drehmoment, Deformation, elektrische Spannung usw. Schlª OFW-Identifikationsmarken; OFW-Mef3wertwandler; drahtlose Abfrage; koh~ente Detektion; integrative Signalverarbeitung Wireless readout of surface acoustic wave identification tags and sensors. We describe wireless readout of 3 different species of passive surface acoustic wave (SAW) identification tags and sensors which all are connected to a small antenna for reception of the interrogation signal and transmission of the delayed sensor response.(1) Following the ringing out of SAW resonators using a phase locked loop (PLL) over several microseconds, their resonance-(,,Eigen"-)frequencies are determined.(2) The time between some response impulses in a SAW delay line, caused by acoustical reflectors in different distances, accurately is measured by 3 different signal integrating methods. (3) Amplitude variations of the response impulse, due to variations of a capacitance externally connected to the SAW delay line are evaluated. All methods are used for wireless readout of fixed and adjustable identification codes and sensor measurands e.g. temperature, pressure, mechanical force, torque, deformation, electrical voltage etc. lative signal processing ' Die OFW-Forschung an der TU Wien wird seit 1983 von Siemens Mª erm6glicht. Seit 1991 bestehen im Thernenkreis der Arbeit intensive F6rderung durch Siemens und Zusammenarbeit zwischen den unten angegebenen Standorten. Die Arbeiten von A. Pohl werden auch durch die Hochschuljubil~iumsstiftung der Stadt Wien unterstª

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“…It is interrogated using the burst mode technique and the temperature dependent resonance frequency is measured with a gated FFT in the unforced time frame, shown in Figure 3a as the red area. The excitation frequency is adjusted over the temperature ramp by setting it to the previously obtained resonance frequency completing the feedback chain of the presented digital-gated phased-locked loop [5]. The TSXO shows a quadratic temperature response with a sensitivity of −1.94 Hz/°C at 25 °C.…”

Section: Sensor Characterizationmentioning

confidence: 99%

Ultrasonic Coupled Passive Wireless Oscillating Sensor System

Aftab¹,

Schaechtle²,

Hoppe³

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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This paper presents, for the first time, an instrumentation technique for passively extracting a resonance frequency of a high-Q resonator across a wireless ultrasonic channel. As a first application, passive wireless measurement of temperature is presented along with a proof of concept of the wireless and passive operation of the device. Temperature resolution of 0.17 °C and a measurement range of 350 mm has been demonstrated.

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Wireless sensing using oscillator circuits locked to remote high-Q SAW resonators

Cited by 68 publications

References 4 publications

A surface acoustic wave response detection method for passive wireless torque sensor

A surface acoustic wave response detection method for passive wireless torque sensor

Drahtlose Abfrage von Oberflächenwellen-Identifikationsmarken und Meßwertwandlern

Ultrasonic Coupled Passive Wireless Oscillating Sensor System

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