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- W4376129136 abstract "표면탄성파를 이용한 온도센서는 비접촉 무전원 무선센싱이 가능하여 무선 또는 IoT기반 구조 건전성 모니터링 분야에 폭넓은 사용이 기대되고 있다. 표면탄성파 온도센서의 IDT(inter-digital transducer)는 형상과 제작이 비교적 쉬운 단방향 IDT 구조가 많이 사용되지만 센싱 신호크기가 작아 무선 송 · 수신 거리를 증가시키기 위하여 양방향 IDT 구조의 표면탄성파 온도센서를 제안하였다. 양방향 IDT 구조의 SAW 온도센서는 음향 반사판에서 반사되는 공진주파수 신호가 각각의 IDT에서 전파되는 신호가 동위상일 경우 신호크기가 증대되어 무선 송 ·수신 거리를 증가시킬 수 있다. 425 MHz의 공진주파수를 가지는 양방향 IDT 구조의 표면탄성파 온도센서를 제작하여 –20℃~80℃의 온도 범위에서 실험을 수행한 결과 온도와 공진주파수 변화사이에 결정계수 0.99 이상의 선형적인 관계와 약 30 kHz/℃의 주파수 분해능을 나타내어 단방향 IDT 구조센서보다 우수한 센서 성능을 나타내었다. In structural health monitoring, temperature sensors, based on surface acoustic wave (SAW), for wireless and IoT sensing networks are well recognized owing to their non-contact and non-powered sensing capabilities. The inter-digital transducer (IDT) of these sensors is often based on a uni-directional structure, which has limitations in sensing signal amplitude. Therefore, to increase the wireless transmission/reception distance, we have proposed a bi-directional IDT structure for SAW temperature sensors in this study. The signal amplitude can be amplified in a bi-directional IDT structure when the resonant frequency signals reflected from the acoustic reflectors are same-phase with the signals propagating in each IDT, resulting in increased wireless transmission/reception distance. The fabricated SAW temperature sensor with bi-directional IDTs, operating at 425 MHz, exhibited a linear relationship with a determination coefficient above 0.99 between -20℃ to 80℃ temperature and resonance frequency change with a frequency resolution of 30 kHz/℃. Therefore, it can be concluded that more accurate wireless temperature measurement is possible using bi-directional IDTs." @default.
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- W4376129136 date "2023-04-30" @default.
- W4376129136 modified "2023-10-18" @default.
- W4376129136 title "Wireless Surface Acoustic Wave Temperature Sensor using Bi-directional Wave Propagation" @default.
- W4376129136 doi "https://doi.org/10.7779/jksnt.2023.43.2.108" @default.
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