센서학회지 (Journal of Sensor Science and Technology)

  • 제28권2호
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  • Pages.106-112
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  • 2019
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  • 1225-5475(pISSN)
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  • 2093-7563(eISSN)
한국센서학회 (The Korean Sensors Society)
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전자 미트 응용을 위한 유연 압전 충격 센서의 제조와 특성 평가

Fabrication and Evaluation of a Flexible Piezoelectric Impact Force Sensor for Electronic Mitt Application

  • 나용현 (한국세라믹기술원 광전자부품소재센터) ;
  • 이민선 (한국세라믹기술원 광전자부품소재센터) ;
  • 조정호 (한국세라믹기술원 광전자부품소재센터) ;
  • 백종후 (한국세라믹기술원 광전자부품소재센터) ;
  • 이정우 (부산대학교재료공학과) ;
  • 박영준 ((주)아이엔아이테크, 기술연구소) ;
  • 정영훈 (한국세라믹기술원 광전자부품소재센터)
  • Na, Yong-hyeon (Optic&electronic Components Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Min-seon (Optic&electronic Components Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Jeong-ho (Optic&electronic Components Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Paik, Jong-hoo (Optic&electronic Components Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Jung Woo (Department of Materials Science and Engineering, Pusan National University) ;
  • Park, Youngjun (INI Tech R&D center) ;
  • Jeong, Young Hun (Optic&electronic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
  • 투고 : 2019.03.09
  • 심사 : 2019.03.25
  • 발행 : 2019.03.31
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초록

Flexible impact force sensors composed of piezoelectric PZT/PDMS composite sandwiched between Al/PET films were fabricated and their voltage signal characteristics were evaluated under varying impact forces for electronic mitt applications. The piezoelectric impact force sensor on an ethylene-vinyl acetate (EVA) substrate exhibited an output voltage difference of no greater than 40 mV a periodical impact test in with the impact load was increased by as much as 240 N by a restoration time of 5 s in a five-time experiment, implying good sensing ability. Moreover, the impact force sensor embedded four electronic mitts showed a reliable sensitivity of less than 1 mV/N and good repeatability under 100 N-impact force during a cycle test executed 10,000 times. This indicated that the fabricated flexible piezoelectric impact sensor could be used in electronic mitt applications. However, the relatively low elastic limit of substrate material such as EVA or poly-urethane slightly deteriorated the sensitivity of the impact sensor embedded electronic mitt at over 200 N-impact forces.

키워드

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Fig. 1. Commercial PVDF piezoelectric impact force sensor for electronic body armour.

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Fig. 2. Particle size analysis spectra of the piezoelectric ceramic powders (S55, Sunny Tech. Co., Taiwan) after ball-milling for 24 h.

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Fig. 3. Flow chart of fabrication process for flexible piezoelectric impact force sensor composed of 50 μm-thick piezoelectric composite film sandwiched Al/PET film.

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Fig. 5. Testing apparatus using a rotating hammer fitted with a hemispherical impactor

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Fig. 10. Repeatability measurements of the impact force sensor for the electronic mitt set to periodic 100 N impact force.

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Fig. 4. (a) Schematic image of the impact force tester for measurement of output signal from the electronic mitt and (b) real images of the impact force tester system.

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Fig. 6. (a) Schematic of cross-sectional structure of the flexible piezoelectric impact force sensor, (b) the printed piezoelectric composite film on Al/PET film (left) and the final product of flexible piezoelectric impact force sensor.

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Fig. 7. Output voltage obtained from the flexible piezoelectric impact force sensor at various impact force.

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Fig. 8. (a) Internal structure and (b) photograph of the fabricated electronic mitt.

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Fig. 9. Output sensing signal of the fabricated electronic mitt depending on applied impact force.

Table 1. Piezoelectric and dielectric properties of the piezoelectric ceramic (S55, Sunny Tech. Co., Taiwan) sintered at 1,100℃.

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Table 2. Summary of voltage signals from piezoelectric impact force sensor on EVA (ethylene-vinyl acetate) plate after impact force loading.

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Table 3. Summary of impact sensing signal characteristics of the piezoelectric sensor embedded electronic mitts.

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