Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers

Sivaram Nishal Ramadas; Richard O'Leary; Anthony Mulholland; Gordon Hayward; Allan Mackintosh; Alexandre Troge; Richard Pethrick

doi:10.1109/ULTSYM.2009.5441463

Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers

Sivaram Nishal Ramadas, Richard O'Leary, Anthony Mulholland, Gordon Hayward, Allan Mackintosh, Alexandre Troge, Richard Pethrick

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

1 Citation (Scopus)

629 Downloads (Pure)

Abstract

Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device. Typically a number of layers, 2-4 in number, are employed resulting in discrete impedance steps within the acoustic matching scheme. This can result in impedance matching with limited bandwidth characteristics. This paper investigates the application of tapered transmission line filter theory to implement a graded impedance profile, through the thickness of the matching layer scheme, to solve the impedance mismatch problem whilst accounting for enhanced transducer sensitivity
and bandwidth.

Original language	English
Title of host publication	2009 IEEE International Ultrasonics Symposium
Place of Publication	Piscataway
Publisher	IEEE
Pages	1695-1698
Number of pages	4
ISBN (Print)	9781424443895
DOIs	https://doi.org/10.1109/ULTSYM.2009.5441463
Publication status	Published - 22 Sep 2009
Event	2009 IEEE Ultrasonics Symposium - Rome, Italy Duration: 20 Sep 2009 → 23 Sep 2009

Conference

Conference	2009 IEEE Ultrasonics Symposium
Country	Italy
City	Rome
Period	20/09/09 → 23/09/09

Keywords

acoustic transducers
graded matching layer
acoustic devices
acoustic waves
bandwidth
filtering theory
impedance matching
matched filters
piezoelectric transducers

Access to Document

10.1109/ULTSYM.2009.5441463

IEEE Symposium 2009 Ramadas ISubmitted manuscript, 363 KB

http://ewh.ieee.org/conf/ius_2009/

2 Finished

PGII: Generation, Detection & Analysis of Optimally Coded Ultrasonic Waveforms
Gachagan, A., Hayward, G., Mulholland, A. & Pierce, G.
EPSRC (Engineering and Physical Sciences Research Council)
9/06/08 → 9/09/12
Project: Research
Two-Dimensional Arrays for the Quantitative Characterisation of Complex Defects
Gachagan, A. & Hayward, G.
EPSRC (Engineering and Physical Sciences Research Council)
1/04/08 → 31/03/11
Project: Research

Cite this

@inproceedings{7792d863173b4a88ac2bd41656366f3c,

title = "Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers",

abstract = "Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device. Typically a number of layers, 2-4 in number, are employed resulting in discrete impedance steps within the acoustic matching scheme. This can result in impedance matching with limited bandwidth characteristics. This paper investigates the application of tapered transmission line filter theory to implement a graded impedance profile, through the thickness of the matching layer scheme, to solve the impedance mismatch problem whilst accounting for enhanced transducer sensitivity and bandwidth.",

keywords = "acoustic transducers, graded matching layer, acoustic devices, acoustic waves , bandwidth, filtering theory, impedance matching, matched filters, piezoelectric transducers",

author = "Ramadas, {Sivaram Nishal} and Richard O'Leary and Anthony Mulholland and Gordon Hayward and Allan Mackintosh and Alexandre Troge and Richard Pethrick",

year = "2009",

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doi = "10.1109/ULTSYM.2009.5441463",

language = "English",

isbn = "9781424443895",

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booktitle = "2009 IEEE International Ultrasonics Symposium",

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note = "2009 IEEE Ultrasonics Symposium ; Conference date: 20-09-2009 Through 23-09-2009",

}

Ramadas, SN, O'Leary, R , Mulholland, A, Hayward, G, Mackintosh, A, Troge, A & Pethrick, R 2009, Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers. in 2009 IEEE International Ultrasonics Symposium. IEEE, Piscataway, pp. 1695-1698, 2009 IEEE Ultrasonics Symposium, Rome, Italy, 20/09/09. https://doi.org/10.1109/ULTSYM.2009.5441463

Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers. / Ramadas, Sivaram Nishal; O'Leary, Richard ; Mulholland, Anthony; Hayward, Gordon; Mackintosh, Allan; Troge, Alexandre; Pethrick, Richard.

2009 IEEE International Ultrasonics Symposium. Piscataway : IEEE, 2009. p. 1695-1698.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

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AU - Ramadas, Sivaram Nishal

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AU - Troge, Alexandre

AU - Pethrick, Richard

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N2 - Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device. Typically a number of layers, 2-4 in number, are employed resulting in discrete impedance steps within the acoustic matching scheme. This can result in impedance matching with limited bandwidth characteristics. This paper investigates the application of tapered transmission line filter theory to implement a graded impedance profile, through the thickness of the matching layer scheme, to solve the impedance mismatch problem whilst accounting for enhanced transducer sensitivity and bandwidth.

AB - Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device. Typically a number of layers, 2-4 in number, are employed resulting in discrete impedance steps within the acoustic matching scheme. This can result in impedance matching with limited bandwidth characteristics. This paper investigates the application of tapered transmission line filter theory to implement a graded impedance profile, through the thickness of the matching layer scheme, to solve the impedance mismatch problem whilst accounting for enhanced transducer sensitivity and bandwidth.

KW - acoustic transducers

KW - graded matching layer

KW - acoustic devices

KW - acoustic waves

KW - bandwidth

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KW - impedance matching

KW - matched filters

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Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers

Abstract

Conference

Keywords

Access to Document

PGII: Generation, Detection & Analysis of Optimally Coded Ultrasonic Waveforms

Two-Dimensional Arrays for the Quantitative Characterisation of Complex Defects

Cite this