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Title: Frequency‐Locked Wireless Multifunctional Surface Acoustic Wave Sensors

Journal Article · · Advanced Sensor Research
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  1. Department of Mechanical Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA
  2. Department of Biomedical Engineering and Sciences Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA

Abstract Surface acoustic waves (SAWs) have shown great potential for developing sensors for structural health monitoring (SHM) and lab‐on‐a‐chip (LOC) applications. Existing SAW sensors mainly rely on measuring the frequency shifts of high‐frequency (e.g., >0.1 GHz) resonance peaks. This study presents frequency‐locked wireless multifunctional SAW sensors that enable multiple wireless sensing functions, including strain sensing, temperature measurement, water presence detection, and vibration sensing. These sensors leverage SAW resonators on piezoelectric chips, inductive coupling‐based wireless power transmission, and, particularly, a frequency‐locked wireless sensing mechanism that works at low frequencies (e.g., <0.1 GHz). This mechanism locks the input frequency on the slope of a sensor's reflection spectrum and monitors the reflection signal's amplitude change induced by the changes of sensing parameters. The proof‐of‐concept experiments show that these wireless sensors can operate in a low‐power active mode for on‐demand wireless strain measurement, temperature sensing, and water presence detection. Moreover, these sensors can operate in a power‐free passive mode for vibration sensing, with results that agree well with laser vibrometer measurements. It is anticipated that the designs and mechanisms of the frequency‐locked wireless SAW sensors will inspire researchers to develop future wireless multifunctional sensors for SHM and LOC applications.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; NE0009187
OSTI ID:
2429048
Journal Information:
Advanced Sensor Research, Journal Name: Advanced Sensor Research Journal Issue: 12 Vol. 3; ISSN 2751-1219
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Country unknown/Code not available
Language:
English

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