A thermally flexible and multi-site tactile sensor for remote 3D dynamic sensing imaging
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RESEARCH ARTICLE
A thermally flexible and multi-site tactile sensor for remote 3D dynamic sensing imaging Guoting Xia1, Yinuo Huang1, Fujiang Li2, Licheng Wang3, Jinbo Pang4, Liwei Li1, Kai Wang (✉)1 1 School of Electrical Engineering, Qingdao University, Qingdao 266000, China 2 Department of Pediatric Surgery, Affiliated Hospital of Qingdao University, Qingdao 266000, China 3 College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China 4 Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, Institute for Advanced Interdisciplinary Research (iAIR), Jinan University, Jinan 250022, China
© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A flexible, multi-site tactile and thermal sensor (MTTS) based on polyvinylidene fluoride (resolution 50 50) is reported. It can be used to implement spatial mapping caused by tactile and thermal events and record the two-dimensional motion trajectory of a tracked target object. The output voltage and current signal are recorded as a mapping by sensing the external pressure and thermal radiation stimulus, and the response distribution is dynamically observed on the three-dimensional interface. Through the mapping relationship between the established piezoelectric and pyroelectric signals, the piezoelectric component and the pyroelectric component are effectively extracted from the composite signals. The MTTS has a good sensitivity for tactile and thermal detection, and the electrodes have good synchronism. In addition, the signal interference is less than 9.5% and decreases as the pressure decreases after the distance between adjacent sites exceeds 200 µm. The integration of MTTS and signal processing units has potential applications in human-machine interaction systems, health status detection and smart assistive devices. Keywords tactile/thermal sensor, piezoelectric/pyroelectric effects, high resolution, spatial mapping, motion monitoring
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Introduction
The rapid development of artificial intelligence has stimulated the research of smart sensor technology to meet the needs of wearable devices and human-machine Received August 8, 2019; accepted September 11, 2019 E-mail: [email protected]
interaction [1,2]. To simulate mechanical and thermal stimulation functions of skin sensing, multi-function sensors are more potential in application [3]. In particular, thin film systems have great applications in condition monitoring, human-machine interaction, and bionic medical devices due to their low cost and flexibility [4–6]. In recent years, sensor arrays make spatial mapping viable by sensing and quantifying external stimuli and has thus led to more and more researches [7–9]. Space mapping and basic, simple trajectory tracking are achieved through the design of a triboelectric induction array [10]. Light-emitting diodes and thin electret films based on triboelectric mechanisms are used to perform a momentary touch event and record the motio
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