Abstract
Two Surface acoustic wave (SAW) resonators were fabricated on langasite substrates with Euler angle of (0°, 138.5°, 117°) and (0°, 138.5°, 27°). A dipole antenna was bonded to the prepared SAW resonator to form a wireless sensor. The characteristics of the SAW sensors were measured by wireless frequency domain interrogation methods from 20 °C to 600 °C. Different temperature behaviors of the sensors were observed. Strain sensing was achieved using a cantilever configuration. The sensors were measured under applied strain from 20 °C to 500 °C. The shift of the resonance frequency contributed merely by strain is extracted from the combined effects of temperature and strain. Both the strain factors of the two SAW sensors increase with rising ambient temperature, and the SAW sensor deposited on (0°, 138.5°, 117°) cut is more sensitive to applied strain. The measurement errors of the two sensors are also discussed. The relative errors of the two sensors are between 0.63% and 2.09%. Even at 500 °C, the hysteresis errors of the two sensors are less than 5%.
Highlights
Nowadays, strain measurements for structural health monitoring (SHM) are in great demand, in the aerospace, automotive and energy industries [1]
Wireless Surface acoustic wave (SAW) sensors were deposited on LGS substrate with Euler angle
From room temperature to 600 °C, the resonance frequency of the two SAW sensors under different applied strain was measured by wireless interrogation methods
Summary
Strain measurements for structural health monitoring (SHM) are in great demand, in the aerospace, automotive and energy industries [1]. Wireless sensing is advantageous when traditional wired strain gages are not convenient or sufficiently robust for rotating machine components or in harsh environments. Dielectric and microwave cavity resonators that can operate at temperatures up to 700 °C have been used for wireless passive high temperature sensing [2,3]. Surface acoustic wave (SAW) sensors fabricated on high-temperature piezoelectric substrates have attracted considerable attention due to the properties of being passive and having high sensitivity, small size, low cost and good reproducibility [4]
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