January 2024
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3 Reads
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2 Citations
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January 2024
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3 Reads
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2 Citations
October 2022
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216 Reads
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4 Citations
June 2022
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181 Reads
We report the first-ever in-situ imaging of 3D-Printed Electronics (PE) ink delivery and drying during the printing using GHz ultrasonic imager. The CMOS integrated GHz ultrasonic technology consists of a 128 x 128-pixel array of Aluminum Nitride transducers that image the surface of the silicon chip with transmit/receive of short ultrasonic pulses. The reflected US pulses measure crucial ink parameters such as ink's acoustic impedance and temperature at a sampling rate of up to 30 frames per second. We demonstrate the observation of ink droplets delivered to a surface, the creation of secondary droplets on the surface, and the time history of the ink curing process. The data at single pixel and images over a collection of images indicates that the GHz imager can be used to provide real-time quantitative feedback on the printing process, thus providing uniform and higher yield PE devices.
September 2021
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32 Reads
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5 Citations
September 2020
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37 Reads
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7 Citations
October 2019
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80 Reads
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14 Citations
... Existen diferentes técnicas para procesamiento de señales digitalizadas del sonido. Una de las más usadas es la trasformada de Fourier (Wang, Chen, Shen, Zhong, & Li, 2022), (Hwang, Kuo, Baskota, & Lal, 2024), (Konno, Dobroiu, Suzuki, Asada, & Ito, 2021), (Zhou & Lu, 2021). ...
January 2024
... However, the spatial resolution (0.5 -2mm) provided by this frequency range is insufficient for smaller organisms to capture their fine structural details. On the other hand, GHz frequencies offer significantly higher resolution of ∼0.5 m to 50 , which have been previously used to study cells [9], [10], soil nematodes [11], thin chitosan films [12], and metamaterial lenses [13]. Therefore, GHz Ultrasonic Imaging has the potential to resolve mechanical properties of C. elegans at a higher resolution. ...
October 2022
... Due to their powerful parallel processing, high computational efficiency, and minimal crosstalk, wave-based analog computing systems have been hailed as a potential future of computing 1,8,9 . It was the pioneering work of Silva et al. 10 on computational metamaterials that set the stage for subsequent research into analog computing systems that perform mathematical operations and solve equations [1][2][3][4]37 , with a subset of these focusing on the use of the Fourier transform (FT) to do so 3,6,9,10,[26][27][28]37 . More recently, Zangeneh-Nejad et al. provided a well-written, comprehensive overview of recent developments in this field as a whole 1 . ...
September 2021
... The Fourier transform (FT) is a mathematical operation that maps a function in one variable to the spectral space of its conjugate variable 14,36-38 . It is a powerful tool with wide-ranging applications in myriad disciplines 4,[22][23][24][36][37][38][39][40][41][42][43] . Currently, the two-dimensional Fast Fourier Transform (FFT) algorithm has a computational complexity of O (N 2 logN) , which is not efficient enough for certain applications, such as real-time image processing in autonomous systems 4,22-24 . ...
September 2020
... To date, the ultrasonic WFC has been investigated only for the FFT of 2D data for image processing, however, 1-D FFT for signal processing is important and how to use such a WFC system for signal processing remains unknown. On the other hand, the WFC system using GHz ultrasonic waves 11,13,14 passing through a flat lens 15,16 will be finally packaged into a chip by semiconductor technologies. Before fabrication and measurement, it is important to validate the idea, investigate the main factors that which cause errors, and optimize the system design. ...
October 2019