Last improvements in the analysis of resonant strip sensors

The paper proposes new improvements to a previously established two-dimensional model of 29.3 MHz NLC-cut strip resonators used as temperature sensors. Starting from that previous model, we present a model which takes into account the dependence of the vibration mode along the third coordinate i.e....

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Bibliographic Details
Main Authors: Dulmet, B., Tinguy, P., Lazarov, Y., Spassov, L.
Format: Conference Proceeding
Language:English
Subjects:
Boundary conditions
Capacitance
Chemical sensors
Force sensors
Frequency measurement
Platinum
Resonance
Strips
Temperature sensors
Thermal force
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Summary:The paper proposes new improvements to a previously established two-dimensional model of 29.3 MHz NLC-cut strip resonators used as temperature sensors. Starting from that previous model, we present a model which takes into account the dependence of the vibration mode along the third coordinate i.e. along the length of the strip, by means of Hamilton's principle. Thereafter, an estimation of the C 1 parameter is numerically achieved by performing additional simplifications, which have little effect onto the accuracy in the circumstance. We also present the results of a force-sensitivity experiment applying a compressive load equal to - 1N at the end of the sensor narrow plate. The measured frequency shift was close to 1.3 kHz. Simple calculations show that the frequency shift predicted by the acousto-elastic effect is much larger than the shift arising from the action of rigid stiffening onto the flexural branch coupled with thickness shear. These first investigations indicate that the force-frequency effect in strip resonators seems to be large enough to make them usable as force sensors.
ISSN:2327-1914
DOI:10.1109/FREQ.2007.4319098