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http://dx.doi.org/10.14775/ksmpe.2019.18.4.100

Development of New Stacked Element Piezoelectric Polyvinylidene Fluoride Pressure Sensor for Simultaneous Heartbeat and Respiration Measurements  

Park, Chang-Yong (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
Kweon, Hyun-Kyu (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
Lee, So-Jin (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
Manh, Long-Nguyen (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.18, no.4, 2019 , pp. 100-108 More about this Journal
Abstract
In this paper, a new stacked element pressure sensor has proposed for heartbeat and respiration measurement. This device can be directly attached to an individual's chest; heartbeat and respiration are detected by the pulsatile vibration and deformation of the chest. A key feature of the device is the simultaneous measurement of heart rate and respiration. The structure of the sensor consists of two stacked elements, in which one element includes one polyvinylidene fluoride (PVDF) thin film bonded on polydimethylsiloxane (PDMS) substrate. In addition, for the measurement and signal processing, the electric circuit and the filter are simply constructed with an OP-amp, resistance, and a capacitor. One element (element1, PDMS) maximizes the respiration signal; the other (element2, PVDF) is used to measure heartbeat. Element1 and element2 had sensitivity of 0.163V/N and 0.209V/N, respectively, and element2 showed improved characteristics compared with element1 in response to force. Thus, element1 and element2 were optimized for measuring respiration heart rate, respectively. Through mechanical and vivo human tests, this sensor shows the great potential to optimize the signals of heartbeat and respiration compared with commercial devices. Moreover, the proposed sensor is flexible, light weight, and low cost. All of these characteristics illustrate an effective piezoelectric pressure sensor for heartbeat and respiration measurements.
Keywords
Piezoelectric; Pressure Sensor; Polyvinylidene Fluoride; Heartbeat; Respiration;
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