SAW Parameters on Y-cut Langasite Structured Materials

Puccio, D.; Malocha, D.C.; Saldanha, N.; Cunha, M. Pereira da

doi:10.1109/tuffc.2007.471

Cited by 23 publications

(12 citation statements)

References 10 publications

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“…It should be noticed in ones mind that the minimum phase velocity for quartz crystal is 3300 m/s, which means that the SNGS and STGS crystal are of small phase velocity and can be applied in miniaturized devices. Compared with the experiential values [17,18], it can be found that the calculation is in agreement with experimental results. In addition, we can find that the SAW phase velocity of SNGS is much higher than that of STGS.…”

Section: Resultssupporting

confidence: 71%

“…In comparison, the electromechanical coupling coefficients of SNGS and STGS crystals are much higher than that of quartz (less than 0.3%) in most propagation directions. Comparing the electromechanical coupling coefficients of SNGS and STGS crystals for the Y cuts with the experimental data [17], the calculation predicted electromechanical coupling coefficients is basically accurate. In 45 • , 60 • , 75 • of Y-cut STGS cases a good agreement exists between our calculations and the experimental measurements.…”

Section: Resultsmentioning

confidence: 66%

“…The band structure and density of states, however, have not been investigated as far as we know. The measurement of the SAW parameters for STGS at Y-cut [17] and SNGS at X, Y, Z cuts [18] shows great promise for SAW applications. But the theory calculation for phase velocity and piezoelectric properties has not been reported.…”

Section: Introductionmentioning

confidence: 99%

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Study on the structure and surface acoustic wave properties of SNGS and STGS piezoelectric crystals

Qiu

Jiao

et al. 2011

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 66%

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Study on the structure and surface acoustic wave properties of SNGS and STGS piezoelectric crystals

Qiu

Jiao

et al. 2011

Journal of Alloys and Compounds

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“…These losses will be more apparent for SAW devices operated at frequencies of hundreds of MHz as used here although they may be minimal at low frequencies [26]. These considerations suggest that the width of IDTs in langasite SAW devices should be limited and that the sheet resistance of the metallization is an important parameter.…”

Section: Model Verification and Input Admittancementioning

confidence: 91%

Langasite surface acoustic wave gas sensors: modeling and verification

Zheng

Greve

Oppenheim

2013

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

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We report finite element simulations of the effect of conductive sensing layers on the surface wave velocity of langasite substrates. The simulations include both the mechanical and electrical influences of the conducting sensing layer. We show that three-dimensional simulations are necessary because of the out-of-plane displacements of the commonly used (0, 138.5, 26.7) Euler angle. Measurements of the transducer input admittance in reflective delay-line devices yield a value for the electromechanical coupling coefficient that is in good agreement with the threedimensional simulations on bare langasite substrate. The input admittance measurements also show evidence of excitation of an additional wave mode and excess loss due to the finger resistance. The results of these simulations and measurements will be useful in the design of surface acoustic wave gas sensors.

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“…The sensor is wireless, operates at 433 MHz, and withstands temperatures of 600°C for 192 hours. Exotic materials such as langatite and langatate have been characterized from -100°C to 200°C [25]. These new materials may enable SAW sensors to operate at greater than 1000°C.…”

Section: Aircraft Propulsion Applicationsmentioning

confidence: 99%

Passive wireless SAW sensors for IVHM

Wilson

Perey

Atkinson

et al. 2008

2008 IEEE International Frequency Control Symposium

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Abstract-NASA aeronautical programs require integrated vehicle health monitoring (IVHM) to ensure the safety of the crew and the vehicles. Future IVHM sensors need to be small, light weight, inexpensive, and wireless. Surface acoustic wave (SAW) technology meets all of these constraints. In addition it operates in harsh environments and over wide temperature ranges, and it is inherently radiation hardened. This paper presents a survey of research opportunities for universities and industry to develop new sensors that address anticipated IVHM needs for aerospace vehicles. Potential applications of passive wireless SAW sensors from ground testing to high altitude aircraft operations are presented, along with some of the challenges and issues of the technology.

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SAW Parameters on Y-cut Langasite Structured Materials

Cited by 23 publications

References 10 publications

Study on the structure and surface acoustic wave properties of SNGS and STGS piezoelectric crystals

Study on the structure and surface acoustic wave properties of SNGS and STGS piezoelectric crystals

Langasite surface acoustic wave gas sensors: modeling and verification

Passive wireless SAW sensors for IVHM

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