A differential measurement SAW device for passive remote sensoring

Buff, W.; Rusko, M.; Vandahl, T.; Goroll, M.; Möller, Frank

doi:10.1109/ultsym.1996.583988

Cited by 27 publications

(16 citation statements)

References 3 publications

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“…However, most of the SAW sensors developed in the industry can only measure either the pressure or the temperature [3,6,[7][8][9][10]. Some SAW sensors can measure both parameters but the structures are quite complicated [4,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A novel wireless passive SAW sensor based on the delay line theory

Zheng

2008

2008 3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems

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A novel wireless passive SAW temperature and pressure sensor is designed, based on the SAW delay line theory. The effect of the temperature is included in the pressure feedback signal and a weighted factor is introduced in order to separate the temperature effect from the feedback signal. Therefore, the temperature and pressure can be accurately measured at the same time. In this sensor design, the energy converted from IDT is fully used, and the interference between the signals is minimized. The IDT and its reflectors have been optimally designed to improve the sensitivity of the sensor. This wireless passive sensor is capable of working under complicated and hard conditions.

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Section: Introductionmentioning

confidence: 99%

A novel wireless passive SAW sensor based on the delay line theory

Zheng

2008

2008 3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems

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“…If the correlation between change of temperature and variation of frequency is known and can be expressed in a mathematical formula, the temperature can be calculated. The correlation between temperature and resonance frequency of a SAW resonator is well-known and described in many publications ( [1], [3], [5], [9], [10]). Fig.…”

Section: Principle Of Operationmentioning

confidence: 98%

“…If a constant transmission channel cannot be guaranteed, the differential measurement principle can be used. The principle is based on the calculation of difference frequency of double resonators and is described in detail in [10]. There also is the problem of aging.…”

Section: A Laboratory Measurementsmentioning

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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“…It has been shown that a differential measurement setup considerably improves the sensitivity, as well as the accuracy of the measurement setup [51]. Figure 15 depicts a photo and schematic of the measurement setup featuring a mechanical bending beam with two mounted SAW resonators in a differential configuration.…”

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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A differential measurement SAW device for passive remote sensoring

Cited by 27 publications

References 3 publications

A novel wireless passive SAW sensor based on the delay line theory

A novel wireless passive SAW sensor based on the delay line theory

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

Six-Port Based Interferometry for Precise Radar and Sensing Applications

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