High temperature ultrasonic immersion measurements using a BS-PT based piezoelectric transducer without a delay line

Bilgunde, Prathamesh N.; Bond, Leonard J.

doi:10.1063/1.5031576

Cited by 2 publications

(3 citation statements)

References 48 publications

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“…The developed ultrasonic transducer was tested only up to 142 °C, because signal loss was obtained. Although sellers assure that this conductive paste could be used up to 340 °C, this failure could be explained by the degradation of the conductive paste, which was used to replace a solder [ 34 , 111 ].…”

Section: Bonding Methodsmentioning

confidence: 99%

“…As it was mentioned above, one of the most important requirements for the high temperature ultrasonic transducers used in hot liquid sodium is wettability of the protective layer. Such a property possesses a layer made of nickel that is widely used in many applications [ 34 , 35 , 36 ]. The shortcoming of this material is that the acoustic impedance of nickel is very high (50.7 MRayl) and in spite of the quarter wavelength thickness of the protective layer there is a significant mismatch of acoustic impedances between the transducer and liquid sodium.…”

Section: Types Of the Ultrasonic Transducersmentioning

confidence: 99%

“…Due to that, a lower amplitude of the received ultrasonic signal is obtained. The proposed transducer was tested in water and silicon oil up to 142 °C [ 34 ]. The presented example shows that due to other priorities other than providing good acoustic matching, it is necessary to sacrifice the efficiency of an ultrasonic transducer.…”

Section: Types Of the Ultrasonic Transducersmentioning

confidence: 99%

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High Temperature Ultrasonic Transducers: A Review

Kažys

Vaškelienė

2021

Sensors

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There are many fields such as online monitoring of manufacturing processes, non-destructive testing in nuclear plants, or corrosion rate monitoring techniques of steel pipes in which measurements must be performed at elevated temperatures. For that high temperature ultrasonic transducers are necessary. In the presented paper, a literature review on the main types of such transducers, piezoelectric materials, backings, and the bonding techniques of transducers elements suitable for high temperatures, is presented. In this review, the main focus is on ultrasonic transducers with piezoelectric elements suitable for operation at temperatures higher than of the most commercially available transducers, i.e., 150 °C. The main types of the ultrasonic transducers that are discussed are the transducers with thin protectors, which may serve as matching layers, transducers with high temperature delay lines, wedges, and waveguide type transducers. The piezoelectric materials suitable for high temperature applications such as aluminum nitride, lithium niobate, gallium orthophosphate, bismuth titanate, oxyborate crystals, lead metaniobate, and other piezoceramics are analyzed. Bonding techniques used for joining of the transducer elements such as joining with glue, soldering, brazing, dry contact, and diffusion bonding are discussed. Special attention is paid to efficient diffusion and thermo-sonic diffusion bonding techniques. Various types of backings necessary for improving a bandwidth and to obtain a short pulse response are described.

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Section: Bonding Methodsmentioning

confidence: 99%

Section: Types Of the Ultrasonic Transducersmentioning

confidence: 99%

Section: Types Of the Ultrasonic Transducersmentioning

confidence: 99%

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High Temperature Ultrasonic Transducers: A Review

Kažys

Vaškelienė

2021

Sensors

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A Review of Ultrasonic Reflectometry for the Physical Characterization of Lubricated Tribological Contacts: History, Methods, Devices, and Technological Trends

Schirru

Varga

2022

Tribol Lett

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Although “film thickness” and “viscosity” represent two of the most important physical parameters in lubricated tribological contacts, their in situ measurement in tribosystems is still difficult. Sensors based on ultrasonic reflectance are a class of sensing devices that allow the direct measurement of these properties. For tribologists especially, the condition changes of tribosystems are of interest, as they determine the smooth operation, proper lubrication condition or the tribosystems’ change to impending failures. Here, ultrasonic reflectance sensors can provide valuable transient information, as they are capable of measuring the evolution of film thickness and viscosity directly, non-invasive, and in situ, thereby bringing a large benefit over classic commercial condition monitoring sensors such as vibration sensors. This paper reviews the methods of operation of ultrasonic reflectance devices, their historical evolution, limitations, potentials, and outline trends of application for the challenges faced by the tribological community and society.

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High temperature ultrasonic immersion measurements using a BS-PT based piezoelectric transducer without a delay line

Cited by 2 publications

References 48 publications

High Temperature Ultrasonic Transducers: A Review

High Temperature Ultrasonic Transducers: A Review

A Review of Ultrasonic Reflectometry for the Physical Characterization of Lubricated Tribological Contacts: History, Methods, Devices, and Technological Trends

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