Flexible measurement of low-intensity shock wave based on coupling piezoelectric effect of PVDF

FAN Zhiqiang; CHANG Hanlin; HE Tianming; ZHENG Hang; HU Jingkun; TAN Xiaoli

doi:10.11883/bzycj-2022-0152

Volume 43 Issue 1

Jan. 2023

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Article Navigation > Explosion And Shock Waves > 2023 > 43(1): 013102

FAN Zhiqiang, CHANG Hanlin, HE Tianming, ZHENG Hang, HU Jingkun, TAN Xiaoli. Flexible measurement of low-intensity shock wave based on coupling piezoelectric effect of PVDF[J]. Explosion And Shock Waves, 2023, 43(1): 013102. doi: 10.11883/bzycj-2022-0152

Citation:

FAN Zhiqiang, CHANG Hanlin, HE Tianming, ZHENG Hang, HU Jingkun, TAN Xiaoli. Flexible measurement of low-intensity shock wave based on coupling piezoelectric effect of PVDF[J]. Explosion And Shock Waves, 2023, 43(1): 013102. doi: 10.11883/bzycj-2022-0152

Citation:

FAN Zhiqiang, CHANG Hanlin, HE Tianming, ZHENG Hang, HU Jingkun, TAN Xiaoli. Flexible measurement of low-intensity shock wave based on coupling piezoelectric effect of PVDF[J]. Explosion And Shock Waves, 2023, 43(1): 013102. doi: 10.11883/bzycj-2022-0152

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Flexible measurement of low-intensity shock wave based on coupling piezoelectric effect of PVDF

doi: 10.11883/bzycj-2022-0152

1.
School of Science, North University of China, Taiyuan 030051, Shanxi, China
2.
School of Aeronautics, Northwestern Poly technical University, Xi’an 710072, Shaanxi, China
3.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Hefei 230027, Anhui, China

Received Date: 2022-04-11
Rev Recd Date: 2022-07-01

Available Online: 2022-09-09

Publish Date: 2023-01-05

Abstract

Abstract

To explore the flexible measurement technology of low-intensity shock wave, the sensitivity calibration experiment was performed on PVDF (polyvinylidene fluoride) filmed pressure gauges by using a shock tube. The measurement reliability of flexible PVDF pressure gauge for low intensity shock wave was evaluated. To improve the measurement stability and sensitivity, the filmed pressure gauge was modified based on the microstructure design and obtained a flexible gauge with high force-electric sensitivity, which was more suitable for low-intensity shock wave measurement. It was found that the effective output charge caused by the out-of-plane shock wave and the signal-noise ratio were too low when the pressure gauge was in an individual piezoelectric mode that was mostly used in high intensity pressure measurement. The measurement results were significantly influenced by the nonlinear force-electric response of the piezoelectric membrane, the deformation and vibration of the structural surface, and the packaging factors inside the gauge. The effects of these factors led to unstable piezoelectric sensitivity and large discrepancy among different gauges when the gauges were used under low intensity pressure. By using the micro-structure design with circumferential fixed constraint on the filmed gauge, the low-intensity out-of-plane shock can be transformed into a high-amplitude in-plane tensile stress field in the PVDF filmed gauge, causing a coupling piezoelectric working mode. The coupling piezoelectric effect produced by the micro-structure can greatly improve the nominal sensitivity coefficient of the gauge and reduce the individual difference. The nominal sensitivity of the developed flexible gauge is about 900−1350 pC/N within the 0.2−0.7 MPa pressure range, which is about 40 times higher than that in the individual piezoelectric working mode. In addition, the relative measurement error can be controlled within ±13% under the coupling piezoelectric mode. The proposed flexible measurement method of low-intensity shock wave can provide effective design technique for the development of high-sensitive flexible devices which are suitable for shock wave monitoring of personnel equipment.
- shock wave,
- flexible measurement,
- polyvinylidene fluoride (PVDF),
- coupling piezoelectric effect,
- sensitivity coefficient

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References(14)

References

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