Wide Bandwidth and Low Driving Voltage Vented CMUTs for Airborne Applications

Ma, Bo; Firouzi, Kamyar; Brenner, Kevin; Khuri‐Yakub, Butrus T.

doi:10.1109/tuffc.2019.2928170

Cited by 21 publications

(9 citation statements)

References 22 publications

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“…To compensate for the large 65 dB loss, we utilize air-coupled CMUTs. CMUTs are proving to be a superior solution to piezoelectric transducers for the problem of efficiently receiving sound waves in air [56], [57]. These transducers are simple capacitors with a thin plate that is set into vibration by impinging ultrasound waves [58].…”

Section: Airborne Ultrasound Detectionmentioning

confidence: 99%

“…The displacement of the thin plate results in a change in capacitance that is in turn detected by interfacing the CMUT with appropriate electronic circuitry. The high efficiency of CMUTs is due to the large DC electric field across the electrodes (plate and substrate) which permits good signal transduction and the fact that the thin vibrating plates have a mechanical impedance that is well-matched to air [56].…”

Section: Airborne Ultrasound Detectionmentioning

confidence: 99%

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An Airborne Sonar System for Underwater Remote Sensing and Imaging

2020

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High-resolution imaging and mapping of the ocean and its floor has been limited to less than 5% of the global waters due to technological barriers. Whereas sonar is the primary contributor to existing underwater imagery, the water-based system is limited in spatial coverage due to its low imaging throughput. On the other hand, aerial synthetic aperture radar systems have provided high-resolution imaging of the entire earth's landscapes but are incapable of deep penetration into water. In this work, we present a proofof-concept system which bridges the gap between electromagnetic imaging in air and sonar imaging in water through the laser-induced photoacoustic effect and high-sensitivity airborne ultrasonic detection. Here, we use air-coupled capacitive micromachined ultrasonic transducers (CMUTs) which is a critical differentiator from previous works and has enabled the acquisition of an underwater image from a fully airborne acoustic imaging system-a task that has yet to be accomplished in the literature. With the entire imaging system located on an airborne platform, there is much promise for the scalability of our system to one which could perform high-throughput imaging of underwater in large-scale deployment. Non-contact acousticbased imaging modalities are also of much interest to the medical imaging and non-destructive testing communities. Incorporating air-coupled transducers, for example CMUTs, or other resonant sensors in these applications could be aided by the analysis presented throughout this work. INDEX TERMS Capacitive micromachined ultrasonic transducer, CMUT, laser doppler vibrometer, laser ultrasound, non-destructive testing, photoacoustic, sonar, ultrasound, underwater imaging This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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Section: Airborne Ultrasound Detectionmentioning

confidence: 99%

Section: Airborne Ultrasound Detectionmentioning

confidence: 99%

An Airborne Sonar System for Underwater Remote Sensing and Imaging

2020

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“…The mode representing the Helmholtz resonance was shown to emerge at higher pressure levels, and the mode was observed to maintain its frequency and bandwidth. More recently, venting has been adopted as a strategy for simultaneously widening the bandwidth and ensuring a low minimum detectable pressure in CMUTs, through gaseous squeeze film damping [15].…”

Section: B Transducers For Environments Of Elevated Pressurementioning

confidence: 99%

Venting in the Comparative Study of Flexural Ultrasonic Transducers to Improve Resilience at Elevated Environmental Pressure Levels

et al. 2020

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“…In this application, as conceptually illustrated in Fig. 1a, TA waves are generated at root-soil interfaces, with non-contact detection using highly sensitive air-coupled Capacitive Micromachined Ultrasound Transducers (CMUTs) [10], paving the way for high-throughput, autonomous sensing at large spatial scales.…”

Section: Introductionmentioning

confidence: 99%

A Thermoacoustic Imaging System for Noninvasive and Nondestructive Root Phenotyping

Singhvi

Fitzpatrick

Scharwies

et al. 2022

IEEE Trans. Circuits Syst. II

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Information about the root system architecture of plants is of great value in modern crop science. However, there is a dearth of tools that can provide field-scale measurements of below-ground parameters in a non-destructive and non-invasive fashion. In this paper, we propose a multi-modal, non-contact thermoacoustic sensing system to address this measurement gap and discuss various system design aspects in the context of belowground sensing. We also demonstrate the first thermoacoustic images of plant material (potatoes) in a soil medium, with the use of highly sensitive capacitive micromachined ultrasound transducers enabling non-contact detection and cm-scale image resolution. Finally, we show high correlation (adj. R 2 = 0.95) between the measured biomass content and the reconstructed thermoacoustic images of the potato tubers.

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Wide Bandwidth and Low Driving Voltage Vented CMUTs for Airborne Applications

Cited by 21 publications

References 22 publications

An Airborne Sonar System for Underwater Remote Sensing and Imaging

An Airborne Sonar System for Underwater Remote Sensing and Imaging

Venting in the Comparative Study of Flexural Ultrasonic Transducers to Improve Resilience at Elevated Environmental Pressure Levels

A Thermoacoustic Imaging System for Noninvasive and Nondestructive Root Phenotyping

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