Abstract
In this paper, a sensor based on polyvinylidene fluoride (PVDF) piezoelectric thin film was designed and fabricated to detect wrist motion signals. A series of dynamic experiments have been carried out, including the contrast experiments of different materials and force-charge signal characterization. The experimental results show that when the excitation signal exceeds 15 Hz, the sensitivity of the sensor is always stable at 3.10 pC/N. The signal acquisition experiment of the wrist motion has been carried out by using this sensor. The experiment results show that, with the advantages of small size, good flexibility, and high sensitivity, this wrist PVDF sensor can be used to detect the wrist motion signals with weak amplitude, low frequency, strong interference, and randomness.
Highlights
With the development of the mobile Internet and the introduction of the high-performance and low-power System-on-Chip (SoC), wearable devices have been widely applied in various fields such as health care, sports, communication, and virtual reality [1]
Gesture recognition technology based on sensors is often realized by analyzing gestures and location information acquired by sensors such as Inertial Measurement Unit (IMU), magnetometer, and Micro-Electro-Mechanical Systems (MEMS) gyroscope [4]
Q that is generated by the sensor is directly proportional to the external force F, while the polyvinylidene fluoride (PVDF) film and the backing of silicone rubber are all made of elastic materials
Summary
With the development of the mobile Internet and the introduction of the high-performance and low-power System-on-Chip (SoC), wearable devices have been widely applied in various fields such as health care, sports, communication, and virtual reality [1] It emphasizes that the equipment is “worn” on the body and usually has sensors with the function of collecting and detecting information such as physiological signals, acceleration, and location. Gesture recognition technology based on sensors is often realized by analyzing gestures and location information acquired by sensors such as Inertial Measurement Unit (IMU), magnetometer, and Micro-Electro-Mechanical Systems (MEMS) gyroscope [4] In order to meet the application needs of complex human–computer interactions and the recognition of slight gestures, we designed and built a sensor to detect wrist motion signals based on PVDF piezoelectric film in this paper. The innovations of this work include two aspects: a novel structure design and the detection of weak wrist motion signals
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