A1.1 - Q-factor doubling in the acoustoelectronic sensors measurements
- Event
- 54th Winter School on Wave and Quantum Acoustics
2026-02-09 - 2026-02-12
Szczyrk (Poland) - Chapter
- Acoustoelectronic Sensors
- Author(s)
- M. Grabka, K. Jasek, M. Pasternak - Military University of Technology, Warsaw (Poland)
- Pages
- 6 - 7
- DOI
- 10.5162/WSWQA2026/1
- ISBN
- 978-3-910600-09-6
- Price
- free
Abstract
Amplitude vary under the influence of environmental factors. Most commonly only frequency shift is measured using self-oscillating circuits with the sensors working in the positive feedback loop. Alternatively, the systems with an external sweeping generator and detector may be applied. Such systems additionally enable tracking of the amplitude and phase of generated signals. All the approaches are well established and allow for the analysis of signals transmitted through the sensors. The investigations of alternative method based on reflection-coefficient measurements brought an unexpected effect of significantly improving Q-factor of the system. The results of comparative measurements show that reflective measurements yield noticeably higher resonance-peak Q-factors than transmissive measurements, while maintaining similar acoustic power. In the experimental systems this coefficient was doubled. As demonstrated by the results, this improvement persists even under substantial mechanical loading of the acoustic parts of the sensors by functional layers. However, this kind of measurement appears to be sensitive to instrumentation-related issues, and its implementation may be challenging but Q-factor doubling increases the accuracy of measurements and allows to apply heavier mass loading.