NRL-USRD Series F42 Omnidirectional Transducer Standards

Ivey, Larry E.

doi:10.21236/ada068805

Cited by 6 publications

(4 citation statements)

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“…The principle of the PUEH device can be regarded as a hydrophone that converts acoustic signals into electrical signals. Receiving is a non-resonant application: hydrophones work well over the entire band below their resonance point (for our device is ~ 4 MHz) [39]. In addition to the sensitivity of the PUEH device itself, output signals also depend on the strong acoustic signals generated by the ultrasonic transmitter.…”

Section: Resultsmentioning

confidence: 99%

Flexible piezoelectric ultrasonic energy harvester array for bio-implantable wireless generator

et al. 2019

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Ultrasonic driven wireless charging technology has recently attracted much attention in the next generation bio-implantable systems; however, most developed ultrasonic energy harvesters are bulky and rigid and cannot be applied to general complex surfaces. Here, a flexible piezoelectric ultrasonic energy harvester (PUEH) array was designed and fabricated by integrating a large number of piezoelectric active elements with multilayered flexible electrodes in an elastomer membrane. The developed flexible PUEH device can be driven by the ultrasonic wave to produce continuous voltage and current outputs on both planar and curved surfaces, reaching output signals of more than 2 Vpp and 4 μA, respectively. Potential applications of using the flexible PUEH to charge energy-storage devices and power commercial electronics were demonstrated. Its low attenuation performance was also evaluated using the in vitro test of transmitting power through pork tissue, demonstrating its potential use in the next generation of wirelessly powered bioimplantable micro-devices.

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Section: Resultsmentioning

confidence: 99%

Flexible piezoelectric ultrasonic energy harvester array for bio-implantable wireless generator

et al. 2019

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“…First, the LF‐PUEH device is an ultrasound receiver that converts the perceived ultrasonic signal into an electrical signal. Receiving is operated in a non‐resonant mode which works well over a wide range of the band that is below its resonance frequency (the resonance frequency of our piezo‐component is 6.06 MHz) . Apart from the sensitivity of the LF‐PUEH itself, the outputs also depend on the strength of the received ultrasound signal.…”

Section: Resultsmentioning

confidence: 99%

Ultrasound‐Induced Wireless Energy Harvesting for Potential Retinal Electrical Stimulation Application

Jiang

Yang

Chen

et al. 2019

Adv Funct Materials

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Retinal electrical stimulation for people with neurodegenerative diseases has shown to be feasible for direct excitation of neurons as a means of restoring vision. In this work, a new electrical stimulation strategy is proposed using ultrasound-driven wireless energy harvesting technology to convert acoustic energy to electricity through the piezoelectric effect. The design, fabrication, and performance of a millimeter-scale flexible ultrasound patch that utilizes an environment-friendly lead-free piezocomposite are described. A modified dice-and-fill technique is used to manufacture the microstructure of the piezocomposite and to generate improved electrical and acoustic properties. The as-developed device can be attached on a complex surface and be driven by ultrasound to produce adjustable electrical outputs, reaching a maximum output power of 45 mW cm −2 . Potential applications for charging energy storage devices and powering commercial electronics using the device are demonstrated. The considerable current signals (e.g., current >72 µA and current density >9.2 nA µm −2 ) that are higher than the average thresholds of retinal stimulation are also obtained in the ex vivo experiment of an implanted environment, showing great potential to be integrated on implanted biomedical devices for electrical stimulation application.

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“…The low-frequency free-field voltage sensitivity of a thin wall hollow sphere can be calculated from the relation [30]…”

Section: Underwater Sonar Performance Of the Bb Transducersmentioning

confidence: 99%

Design, performance and modeling of piezoceramic hollow-sphere microprobe hydrophones

Alkoy

Meyer

Hughes

et al. 2009

Meas. Sci. Technol.

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This paper describes the design and performance of a small, high-frequency, piezoelectric, underwater probe. The probes are fabricated from miniature, thin-wall, lead zirconate titanate ceramic hollow spheres with radii (r) from 0.5 mm to 2.5 mm and wall thickness (t) from 50 µm to 250 µm. The experimental results reported in this paper are focused on devices prepared from hollow spheres with an outer radius of 1.38 mm and a mean wall thickness of 75 µm. As a hydrophone, these devices display a sensitivity of −220.7 dB re 1 V µPa−1 at 250 kHz that stays flat to within ±3 dB over the frequency range from 10 kHz to 450 kHz with an omnidirectional response. Within the accessible range of sphere sizes (r = 0.5–2.5 mm, t = 50–250 µm), this stable and flat sensitivity behavior could be extended to a range from −212 to −225 dB re 1 V µPa−1 and up to 1 MHz. Finite element analysis of this transducer using the ATILA® software is also included in this paper, comparing the computational results with the results from the experimental measurements. Based on the excellent agreement obtained, a parametric modeling study was also undertaken and its results are discussed in this paper. The miniature ceramic hollow-sphere transducers fill a gap in the frequency range of 200 kHz to 1 MHz with an omnidirectional response and much higher sensitivity than other ceramic and polymer piezoelectric probes.

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NRL-USRD Series F42 Omnidirectional Transducer Standards

Cited by 6 publications

References 0 publications

Flexible piezoelectric ultrasonic energy harvester array for bio-implantable wireless generator

Flexible piezoelectric ultrasonic energy harvester array for bio-implantable wireless generator

Ultrasound‐Induced Wireless Energy Harvesting for Potential Retinal Electrical Stimulation Application

Design, performance and modeling of piezoceramic hollow-sphere microprobe hydrophones

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