Magneto-Acoustic Resonator for Aquatic Animal Tracking

Almansouri, Abdullah S.; Salama, Khaled N.; Kosel, Jürgen

doi:10.1109/tmag.2018.2861980

Cited by 12 publications

(11 citation statements)

References 18 publications

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“…The idea of enhancing the bandwidth and amplifying the voltage before rectification to minimize the rectification loss has been discussed by many (Supporting Information 1). [ 10–12,16 ] Gu and Livermore tackled the idea by having a low‐frequency (LF) beam colliding with a high‐frequency (HF) piezoelectric generator at high force, thus increasing the output voltage. [ 11 ] This device, however, is susceptible to elasticity damage, and the performance can degrade over time.…”

Section: Figurementioning

confidence: 99%

A Wideband Magnetic Frequency Up‐Converter Energy Harvester

et al. 2021

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Many sensor applications require small and noninvasive methods of powering, such as marine animal tracking and implantable healthcare monitoring. In such cases, energy harvesting is a viable solution. Vibrational energy harvesting is abundantly available in the environment. These vibrations usually are low in frequency and amplitude. Conventional vibrational harvesters convert the environmental vibrations into electrical signals; however, they suffer from low‐voltage outputs and narrow bandwidths, limiting the harvesting to a small range of frequencies. Herein, a new mechanical harvester is introduced using a magnetic frequency up‐converter. It is implemented using attractive‐force magnetic coupling between a soft magnet and a permanent magnet to convert low‐frequency vibrations into high‐frequency pulses. Combined with a piezoelectric generator, the harvester generates a high output voltage for an extended bandwidth of operation. The proposed harvester shows a 50.15% increase in output voltage at the resonant frequency (12.2 Hz), resulting in 14.79 V at 1.0 g, with a maximum peak voltage of 16.28 V. The bandwidth of operation ranges from 10.77 to 22.16 Hz (11.39 Hz), which when compared with a single‐beam harvester shows an increase of 3250% in the bandwidth, where the average power is greater for 92.56% of this bandwidth.

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Section: Figurementioning

confidence: 99%

A Wideband Magnetic Frequency Up‐Converter Energy Harvester

et al. 2021

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“…The self-powered frequency up-converter is shown in Figure 2 and has previously been developed in a macro version [9]. It consists of a permanent magnet attached to a low-frequency beam, and a high-frequency beam made of a soft magnetic material that is in range of the magnet's stray field.…”

Section: A Conceptmentioning

confidence: 99%

“…Such a device eliminates the need of the battery and the electronics that consume up to 80% of the volume of the acoustic tag. The device is based on a recently introduced concept [9], which is here miniaturized and further enhanced by the implementation of a bistable design. The use of the bistable design significantly improves the intensity of the output acoustic signal of the converter, hence, Fig.…”

Section: Introductionmentioning

confidence: 99%

A Self-Powered Magneto-Acoustic Tracking Transducer

et al. 2019

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Acoustic telemetry is widely used for many tracking applications. Objects or subjects are tracked by attaching an acoustic transmitter onto them or having them wear them. The acoustic signal is then detected by different microphones to determine the location of the tagged target. The size and the weight of the tag determine the size of the target that can be tracked. In the case of small-sized tags, about 80% of the volume is consumed by the battery and electronics, while less than 20% by the actual acoustic transducer. Here, we propose a self-powered acoustic tracking transducer that utilizes a magnetic frequency upconverter that directly converts the low-frequency motions of a target to a high-frequency acoustic signal. The intensity of the output signal is enhanced by realizing a bistable cantilever design by local crystallization of an amorphous metal transducer. A micro device has been realized with dimensions of 8×13×38 mm 3 and a weight of 1.3 g. The measurement results show that the transducer up-converts a low-frequency of 7 Hz to 15 kHz, directly and without the need for an external power source.

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“…In addition, to increase the reliability and eliminate the issues of mechanical contact, magnetic coupling has been investigated as a non-mechanical contact method [ 36 , 45 , 57 , 58 ]. The low-frequency motions of animals were up-converted through a self-powered magnetoacoustic into high-frequency acoustic signals [ 59 ]. On the other hand, an electromagnetic frequency up-converter was used with magnets and coils on top of a resonator beam to generate power [ 58 ].…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Analysis of a Bistable Frequency Up-Converter Piezoelectric Energy Harvester

Atmeh

Ibrahim

Ramini³

2023

Micromachines

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Using energy harvesting to convert ambient vibrations efficiently to electrical energy has become a worthy concept in recent years. Nevertheless, the low frequencies of the ambient vibrations cannot be effectively converted to power using traditional harvesters. Therefore, a frequency up-conversion harvester is presented to convert the low-frequency vibrations to high-frequency vibrations utilizing magnetic coupling. The presented harvester consists of a low-frequency beam (LFB) and a high-frequency beam (HFB) with identical tip magnets facing each other at the same polarity. The HFB, fully covered by a piezoelectric strip, is utilized for voltage generation. The dynamic behavior of the system and the corresponding generated voltage signal has been investigated by modeling the system as a two-degrees-of-freedom (2DOF) lumped-parameter model. A threshold distance of 15 mm that divides the system into a monostable regime with a weak magnetic coupling and a bistable regime with a strong magnetic coupling was revealed in the static analysis of the system. Hardening and softening behaviors were reported at the low frequency range for the mono and bistable regimes, respectively. In addition, a combined nonlinear hardening and softening behavior was captured for low frequencies at the threshold distance. Furthermore, a 100% increment was achieved in the generated voltage at the threshold compared to the monostable regime, and the maximum generated voltage was found to be in the bistable regime. The simulated results were validated experimentally. Moreover, the effect of the external resistance was investigated, and a 2 M resistance was found to be optimal for maximizing the generated power. It was found that frequency up-converting based on magnetic nonlinearity can effectively scavenge energy from low-frequency external vibrations.

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Magneto-Acoustic Resonator for Aquatic Animal Tracking

Cited by 12 publications

References 18 publications

A Wideband Magnetic Frequency Up‐Converter Energy Harvester

A Wideband Magnetic Frequency Up‐Converter Energy Harvester

A Self-Powered Magneto-Acoustic Tracking Transducer

Static and Dynamic Analysis of a Bistable Frequency Up-Converter Piezoelectric Energy Harvester

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