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Highly Sensitive Surface Acoustic Wave Strain Sensor for the Measurement of Tire Deformation
은경태,이기정,이기근,양상식,좌성훈 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.6
We developed a surface acoustic wave (SAW) strain sensor system with high sensitivity for real-time monitoring tire deformation. The SAW sensor utilizes a shear horizontal wave and split interdigital transducer (IDT). After the SAW sensor was attached to the tire specimen, the characteristics of the SAW sensor were investigated using tensile and three-point bending tests, respectively. When external deformation is applied to the SAW sensor, the strain of the piezoelectric substrate changes the distance between the two IDTs and alters the velocity of the propagating SAW, resulting in a change in the center frequency of the SAW sensor. Based on the degree of changes in the center frequency, we can evaluate the extent of the tire deformation. The center frequency linearly decreases by 20 kHz as the tire is strained to 20%. As the tire specimen with SAW sensor was bent upto 2 mm, the center frequency linearly decreased by 25 kHz. The sensitivity and linearity of the SAW strain sensor were measured to be 2.5 kHz/% and 0.97. These results indicate that the developed SAW sensor has excellent sensitivity for external deformation and it is capable of measuring tire deformation.
폴리머 기판에 전사된 실리콘 박막 및 투명 ZnO TFT의 유연성 연구
은경태,황우진,박경애,안종현,김재현,최현주,좌성훈 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.5
본 연구에서는 나노 두께의 단결정 실리콘 박막 및 투명 ZnO TFT 소자를 기판으로부터 분리한 후, transfer printing 기술을 사용하여 그 소자를 다시 폴리머 기판에 부착시켰다. 현재 PI와 PET가 대표적인 유연 기판으로 사용되고 있으며 본 연구에서는 50㎛ 두께의 PI에 단결정 실리콘을 전사하였고, 188㎛의 PET 기판에 ZnO TFT의 전사를 진행하였다. 그 후 굽힘 시험 및 피로 시험을 통하여 폴리머 기판에 전사된 소자들의 유연성(bendability) 및 신뢰성을 파악하였다.