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Authors = Junwu Kan

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9 pages, 2599 KiB  
Article
A Dual-Chamber Serial–Parallel Piezoelectric Pump with an Integrated Sensor for Flow Rate Measurement
by Song Chen, Mai Yu, Junwu Kan, Jianping Li, Zhonghua Zhang, Xinyi Xie and Xiaomin Wang
Sensors 2019, 19(6), 1447; https://doi.org/10.3390/s19061447 - 25 Mar 2019
Cited by 13 | Viewed by 3754
Abstract
A new concept of a dual-chamber serial-parallel piezoelectric pump with an integrated sensor (DSPPIS) is presented in this paper. By means of dividing a piezoelectric bimorph into an actuator and a sensor, sensing function is integrated onto the DSPPIS for flow rate measurement. [...] Read more.
A new concept of a dual-chamber serial-parallel piezoelectric pump with an integrated sensor (DSPPIS) is presented in this paper. By means of dividing a piezoelectric bimorph into an actuator and a sensor, sensing function is integrated onto the DSPPIS for flow rate measurement. A prototype of the DSPPIS was manufactured and assembled from a finished piezoelectric bimorph. Then, frequency and voltage characteristics were tested to evaluate the performance of the DSPPIS with serial and parallel connection. Experimental results show that the optimal frequency range of DSPPIS can be achieved and determined by itself through monitoring the sensing voltage when driven by a fixed voltage of 150 Vpp and a frequency range of 40–400 Hz. For a fixed frequency of 100 Hz and a voltage range of 50–250 Vpp, both the sensing voltage and output flow rate increase with the increase of driving voltage. It is observed that there is a positive correlation between sensing voltage and output flow rate, which was further fitted by using linear function. The correlation coefficients for the DSPPIS with serial and parallel connection are calculated as 0.9716 and 0.9054, respectively. As a result, the DSPPIS demonstrated in this paper has realized the measurement of flow rate without the additional flow-sensing equipment both in serial and parallel connection. Full article
(This article belongs to the Section Physical Sensors)
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8 pages, 390 KiB  
Communication
Piezoelectric Bimorph Cantilever for Vibration-Producing-Hydrogen
by Jun Zhang, Zheng Wu, Yanmin Jia, Junwu Kan and Guangming Cheng
Sensors 2013, 13(1), 367-374; https://doi.org/10.3390/s130100367 - 27 Dec 2012
Cited by 31 | Viewed by 9429
Abstract
A device composed of a piezoelectric bimorph cantilever and a water electrolysis device was fabricated to realize piezoelectrochemical hydrogen production. The obvious output of the hydrogen and oxygen through application of a mechanical vibration of ~0.07 N and ~46.2 Hz was observed. This [...] Read more.
A device composed of a piezoelectric bimorph cantilever and a water electrolysis device was fabricated to realize piezoelectrochemical hydrogen production. The obvious output of the hydrogen and oxygen through application of a mechanical vibration of ~0.07 N and ~46.2 Hz was observed. This method provides a cost-effective, recyclable, environment-friendly and simple way to directly split water for hydrogen fuels by scavenging mechanical waste energy forms such as noise or traffic vibration in the environment. Full article
(This article belongs to the Special Issue Piezoelectric Sensors and Actuators)
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