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. 2019 Nov 26;10:5147. doi: 10.1038/s41467-019-13166-6

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Application of the W-TENG in a self-powered falling point distribution statistical system. a Scheme diagram of the W-TENG based self-powered falling point distribution statistical system. b Demonstration of the self-powered falling point distribution statistical system. Scale bar, 6 cm. c Screenshot showing the real-time statistical result of the self-powered system. d The measured output voltage of the TENG under the impact of ping-pong balls with variable velocities. e The summarized relationship and linear fitting between output voltages and velocities. Error bars indicate standard deviations for five sets of data points. f Graphical illustration showing the moving path of the ping-pong ball above a 4 × 2 W-TES array. g Real-time output voltage signals when a ping-pong ball impacted the surface of a 4 × 2 W-TES array along a path: 1-A → 2-A → 3-B → 4-B. h 2D mapping figure showing the distribution of statistical percentage of the falling points