Remote sensor system using passive SAW sensors

Buff, W.; Plath, F.; Schmeckebier, O.; Rusko, M.; Vandahl, T.; Lück, H.; Möller, Frank; Malocha, D.C.

doi:10.1109/ultsym.1994.401655

Cited by 65 publications

(21 citation statements)

References 5 publications

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“…Environmental conditions influenced the physical parameters of the piezoelectric layer, such as conductivity, stiffness, mass density, and dielectric constant, which in turn influenced the phase velocity and caused a frequency shift. 25,26 The change of SAW velocity is expressed as follows: 27…”

Section: Resultsmentioning

confidence: 99%

Characterization of ZnO films of surface acoustic-wave oscillators for ultraviolet sensing applications

Wei

2010

J. Micro/Nanolith. MEMS MOEMS

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A UV sensor composed of a surface acoustic wave ͑SAW͒ device and a high-frequency amplifier was constructed using a Colpitts oscillator circuit. Zinc oxide ͑ZnO͒ films of SAW devices were prepared on lithium niobate substrates with various deposition temperatures to investigate their effect on the sensitivity of UV sensors. Larger grain sizes and a better chemical composition of the ZnO films were obtained at high-deposition temperatures rather than at low-deposition temperatures. An extreme frequency shift of 264 kHz and sensitivity of 0.21 kHz/ ͑W/cm 2 ͒ were obtained for the ZnO-based SAW oscillator at the deposition temperature of 400°C. © 2010 Society of Photo-Optical Instrumentation Engineers.

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Section: Resultsmentioning

confidence: 99%

Characterization of ZnO films of surface acoustic-wave oscillators for ultraviolet sensing applications

Wei

2010

J. Micro/Nanolith. MEMS MOEMS

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“…Surface acoustic wave (SAW) devices are considered as ideal candidates for structural and material health monitoring applications, because of their reliability and long life [20][21][22][23]. In addition, SAW sensors are known to be extremely rugged and can be manufactured in a relatively small size [20,23].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, SAW sensors are known to be extremely rugged and can be manufactured in a relatively small size [20,23]. In this paper, a passive wireless SAW temperature sensor was used to monitor the temperature variations of concrete.…”

Section: Introductionmentioning

confidence: 99%

Concrete temperature monitoring using passive wireless surface acoustic wave sensor system

Kim

Luis

Smith

et al. 2015

Sensors and Actuators A: Physical

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“…Because the frequencies that can be handled by SAW devices are quite high, the sensor signal can be transmitted wireless. Due to the energy storage in SAW wireless transmission of the sensor signal can be done passively [4]. That means no power supply and no battery is necessary for the sensor.…”

Section: Introductionmentioning

confidence: 99%

An interrogation unit for passive wireless SAW sensors based on Fourier transform

Hamsch

Hoffmann

Buff

et al. 2004

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The application of surface acoustic wave (SAW) resonators as sensor elements for different physical parameters such as temperature, pressure, and force has been well-known for several years. The energy storage in the SAW and the direct conversion from physical parameter to a parameter of the wave, such as frequency or phase, enables the construction of a passive sensor that can be interrogated wireless.This paper presents a temperature-measurement system based on passive wireless SAW sensors. The principle of SAW sensors and SAW sensor interrogation is discussed briefly. A new measurement device developed for analyzing the sensor signals is introduced. Compared to former interrogation units that detect resonance frequency of the SAW resonator by comparing amplitudes of sensor response signals related to different stimulating frequencies, the new equipment is able to measure the resonance frequency directly by calculating a Fourier transformation of the resonator response signal. Measurement results of an experimental setup and field tests are presented and discussed.

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Remote sensor system using passive SAW sensors

Cited by 65 publications

References 5 publications

Characterization of ZnO films of surface acoustic-wave oscillators for ultraviolet sensing applications

Characterization of ZnO films of surface acoustic-wave oscillators for ultraviolet sensing applications

Concrete temperature monitoring using passive wireless surface acoustic wave sensor system

An interrogation unit for passive wireless SAW sensors based on Fourier transform

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