2021/09/21 by Muhammad Junaid Akhtar, Akhtar, Muhammad Junaid, Alp Timuçin Toymuş +5
Earth and Planetary Sciences · Engineering · #Acoustic Wave Resonator Technologies #Advanced Sensor and Energy Harvesting Materials #Energy Harvesting in Wireless Networks #FOS: Electrical engineering #Signal Processing (eess.SP) #Ultrasonics and Acoustic Wave Propagation #Underwater Acoustics Research #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2109.10398
openalex publication_date 2021/09/21 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Ultrasonic backscatter communication has gained popularity in recent years\nwhere piezoceramic resonators are used as acoustic antennas. Currently,\nbackscatter communication revolves around the amplitude modulation of the echo\nsignal by the sensor, which can be modeled as a variable shunt impedance.\nAmplitude based sensing is prone to high levels of noise, motion artifacts, and\nhas low efficiency with respect to power usage and bandwidth. To overcome these\nshortcomings, we present here, a frequency-based sensing method for ultrasonic\nbackscatter communication. This system exhibits a frequency shift in the\nultrasonic sensor's parallel resonance when its shunt capacitance is varied,\nsimilar to an inductive near field link. The concept is simulated using an\nequivalent end-to-end model in SPICE that matches well with the experimental\nobservation. To monitor the resonance frequency shift in the experiments a\nvariety of methods are employed including ringdown measurements, chirp\nspectroscopy, bode analysis and phase locked loop. All the methods provde\nsubstantial proof for feasibility of frequency-based sensing in ultrasonic\nbackscatter communication enabling passive sensor motes for sensing\napplications.\n