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

Hamsch, M.; Hoffmann, René; Buff, W.; Binhack, M.; Klett, S.

doi:10.1109/tuffc.2004.1367485

Cited by 56 publications

(21 citation statements)

References 13 publications

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“…As these are purely passive devices, a reader system is required to interrogate the sensor. To this day, several different reader concepts [45,46,47] for resonant SAW sensors have emerged. The latest systems measure the sensor’s self-resonance frequency directly by transmitting an excitation signal and processing the response signal of the resonator that contains the desired information, typically by means of a fast Fourier transform (FFT) [48].…”

Section: Six-port In Metrologymentioning

confidence: 99%

Six-Port Based Interferometry for Precise Radar and Sensing Applications

Koelpin

Lurz

Linz

et al. 2016

Sensors

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Microwave technology plays a more important role in modern industrial sensing applications. Pushed by the significant progress in monolithic microwave integrated circuit technology over the past decades, complex sensing systems operating in the microwave and even millimeter-wave range are available for reasonable costs combined with exquisite performance. In the context of industrial sensing, this stimulates new approaches for metrology based on microwave technology. An old measurement principle nearly forgotten over the years has recently gained more and more attention in both academia and industry: the six-port interferometer. This paper reviews the basic concept, investigates promising applications in remote, as well as contact-based sensing and compares the system with state-of-the-art metrology. The significant advantages will be discussed just as the limitations of the six-port architecture. Particular attention will be paid to impairment effects and non-ideal behavior, as well as compensation and linearization concepts. It will be shown that in application fields, like remote distance sensing, precise alignment measurements, as well as interferometrically-evaluated mechanical strain analysis, the six-port architecture delivers extraordinary measurement results combined with high measurement data update rates for reasonable system costs. This makes the six-port architecture a promising candidate for industrial metrology.

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Section: Six-port In Metrologymentioning

confidence: 99%

Six-Port Based Interferometry for Precise Radar and Sensing Applications

Koelpin

Lurz

Linz

et al. 2016

Sensors

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“…Duration of oscillations is of course depending on quality factor of the resonator. Resonance frequency of the sensor, directly linked to the mesurand, could be extracted from this signal using Fourrier Transform Analysis for example [11][12][13]. …”

Section: Iii-2 Resonatormentioning

confidence: 99%

Wireless and batteryless surface acoustic wave sensors for high temperature environments

Aubert

Elmazria

Assouar

2009

2009 9th International Conference on Electronic Measurement &Amp; Instruments

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Surface acoustic wave (SAW) devices are widely used as filter, resonator or delay line in electronic systems in a wide range of applications: mobile communication, TVs, radar, stable resonator for clock generation, etc. The resonance frequency and the delay line of SAW devices are depending on the properties of materials forming the device and could be very sensitive to the physical parameters of the environment.Since SAW devices are more and more used as sensor for a large variety of area: gas, pressure, force, temperature, strain, radiation, etc. The sensors based SAW present the advantage to be passive (batteryless) and/or wireless. These interesting properties combined with a small size, a low cost radio request system and a small antennas when operating at high frequency, offer new and exiting perspectives for wireless measurement processes and IDTAG applications. When the materials constituting the devices are properly selected, it becomes possible to use those sensors without embedded electronic in hostile environments (as high temperature, nuclear site, …) where no solutions are currently used. General principle of the SAW sensor in wired and wireless configurations will be developed and a review of recent works concerning the field of high temperature applications will be presented with specific attention given to the choice of materials constituting the SAW device.

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“…Passive and wireless operations are desirable in applications where an unrestricted operation is more critical than the long distance communication [3]. The ability to store energy in SAW and the possibility of handling high frequencies enables the construction of passive sensors with the capability to be interrogated by RF signals [6]. …”

Section: Wireless Operationmentioning

confidence: 99%

A radio frequency controlled microvalve for biomedical applications

et al. 2006

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In this paper we propose the use of a RF controlled microvalve for implementation on a PZT substrate for biomedical applications. Such device has a huge range of applications such as parallel mixing of photo-lithographically defined nanolitre volumes, flow control in pneumatically driven microfluidic systems and lab-on-chip applications. The microvalve makes use of direct actuation mechanisms at the microscale level to allow its use in vivo applications. A number of acoustic propagation modes are investigated and their suitability for biomedical applications, in terms of the required displacement, device size and operation frequency. A theoretical model of the Surface Acoustic Wave (SAW) device is presented and its use in micro-valve application was evaluated using ANSYS tools. Furthermore, the wireless aspect of the device is considered through combining the RF antenna with the microvalve simulation by assuming a high carrier frequency with a small peak-to-peak signal. A new microvalve structure which uses a parallel type piezoelectric bimorph actuator was designed and simulated using ANSYS tools. Then, further optimization of the device was carried out to achieve a better coupling between electrical signal and mechanical actuation within the SAW device.

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

Cited by 56 publications

References 13 publications

Six-Port Based Interferometry for Precise Radar and Sensing Applications

Six-Port Based Interferometry for Precise Radar and Sensing Applications

Wireless and batteryless surface acoustic wave sensors for high temperature environments

A radio frequency controlled microvalve for biomedical applications

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