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Modelling of a novel high-impedance matching layer for high frequency (>30 MHz) ultrasonic transducers

Modelling of a novel high-impedance matching layer for high frequency (>30 MHz) ultrasonic transducers
Modelling of a novel high-impedance matching layer for high frequency (>30 MHz) ultrasonic transducers
This work describes a new approach to impedance matching for ultrasonic transducers. A single matching layer with high acoustic impedance of 16 MRayls is demonstrated to show a bandwidth of around 70%, compared with conventional single matching layer designs of around 50%. Although as a consequence of this improvement in bandwidth, there is a loss in sensitivity, this is found to be similar to an equivalent double matching layer design. Designs are calculated by using the KLM model and are then verified by FEA simulation, with very good agreement Considering the fabrication difficulties encountered in creating a high-frequency double matched design due to the requirement for materials with specific acoustic impedances, the need to accurately control the thickness of layers, and the relatively narrow bandwidths available for conventional single matched designs, the new approach shows advantages in that alternative (and perhaps more practical) materials become available, and offers a bandwidth close to that of a double layer design with the simplicity of a single layer design. The disadvantage is a trade-off in sensitivity. A typical example of a piezoceramic transducer matched to water can give a 70% fractional bandwidth (comparable to an ideal double matched design of 72%) with a 3 dB penalty in insertion loss.

transducer, matching, simulation, modelling, high-frequency
0041-624X
586-591
Qian, Yi Chen
68efc9b1-cc3f-433d-8c22-83e6af327d50
Harris, N.R.
237cfdbd-86e4-4025-869c-c85136f14dfd
Qian, Yi Chen
68efc9b1-cc3f-433d-8c22-83e6af327d50
Harris, N.R.
237cfdbd-86e4-4025-869c-c85136f14dfd

Qian, Yi Chen and Harris, N.R. (2013) Modelling of a novel high-impedance matching layer for high frequency (>30 MHz) ultrasonic transducers. Ultrasonics, 54 (2), 586-591. (doi:10.1016/j.ultras.2013.08.012).

Record type: Article

Abstract

This work describes a new approach to impedance matching for ultrasonic transducers. A single matching layer with high acoustic impedance of 16 MRayls is demonstrated to show a bandwidth of around 70%, compared with conventional single matching layer designs of around 50%. Although as a consequence of this improvement in bandwidth, there is a loss in sensitivity, this is found to be similar to an equivalent double matching layer design. Designs are calculated by using the KLM model and are then verified by FEA simulation, with very good agreement Considering the fabrication difficulties encountered in creating a high-frequency double matched design due to the requirement for materials with specific acoustic impedances, the need to accurately control the thickness of layers, and the relatively narrow bandwidths available for conventional single matched designs, the new approach shows advantages in that alternative (and perhaps more practical) materials become available, and offers a bandwidth close to that of a double layer design with the simplicity of a single layer design. The disadvantage is a trade-off in sensitivity. A typical example of a piezoceramic transducer matched to water can give a 70% fractional bandwidth (comparable to an ideal double matched design of 72%) with a 3 dB penalty in insertion loss.

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More information

Published date: November 2013
Keywords: transducer, matching, simulation, modelling, high-frequency
Organisations: EEE

Identifiers

Local EPrints ID: 359731
URI: http://eprints.soton.ac.uk/id/eprint/359731
ISSN: 0041-624X
PURE UUID: 126717e5-5fc0-458e-be90-99b264f3dc77
ORCID for N.R. Harris: ORCID iD orcid.org/0000-0003-4122-2219

Catalogue record

Date deposited: 11 Nov 2013 11:26
Last modified: 15 Sep 2021 01:38

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Contributors

Author: Yi Chen Qian
Author: N.R. Harris ORCID iD

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