A sensitive electromagnetic acoustic transducer for picometer-scale ultrasonic displacement measurements

S. Boonsang; R. J. Dewhurst

doi:10.1016/j.sna.2005.12.029

A sensitive electromagnetic acoustic transducer for picometer-scale ultrasonic displacement measurements

S. Boonsang, R. J. Dewhurst

Research output: Contribution to journal › Article › peer-review

Abstract

The paper presents a novel design of an electromagnetic acoustic transducer (EMAT) for non-contact ultrasonic measurements. An EMAT sensor has been miniaturized with an overall receiver size to 1.0 cm diameter. It has been combined with a specially designed low noise preamplifier. Calibration procedures with a Michelson interferometer revealed that the EMAT sensor detected small displacement amplitudes as low as 1.0 ± 0.2 pm in aluminium samples, with a signal bandwidth up to 7.5 MHz (-3 dB). Alternatively, the sensitivity figure can be expressed in terms of a noise-equivalent displacement spectrum as 4.2 × 10 -17 mHz -1/2. The absolute sensitivity of the EMAT was 1.98 ± 0.50 V pm -1 for the detection of longitudinal ultrasonic waves. This sensitivity is compared with other forms of ultrasonic transducer. © 2005 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	345-354
Number of pages	9
Journal	Sensors and Actuators, A: Physical
Volume	127
Issue number	2
DOIs	https://doi.org/10.1016/j.sna.2005.12.029
Publication status	Published - 13 Mar 2006

Keywords

Absolute calibration
EMAT
Ultrasonic transducer

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10.1016/j.sna.2005.12.029

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title = "A sensitive electromagnetic acoustic transducer for picometer-scale ultrasonic displacement measurements",

abstract = "The paper presents a novel design of an electromagnetic acoustic transducer (EMAT) for non-contact ultrasonic measurements. An EMAT sensor has been miniaturized with an overall receiver size to 1.0 cm diameter. It has been combined with a specially designed low noise preamplifier. Calibration procedures with a Michelson interferometer revealed that the EMAT sensor detected small displacement amplitudes as low as 1.0 ± 0.2 pm in aluminium samples, with a signal bandwidth up to 7.5 MHz (-3 dB). Alternatively, the sensitivity figure can be expressed in terms of a noise-equivalent displacement spectrum as 4.2 × 10 -17 mHz -1/2. The absolute sensitivity of the EMAT was 1.98 ± 0.50 V pm -1 for the detection of longitudinal ultrasonic waves. This sensitivity is compared with other forms of ultrasonic transducer. {\textcopyright} 2005 Elsevier B.V. All rights reserved.",

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AU - Dewhurst, R. J.

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AB - The paper presents a novel design of an electromagnetic acoustic transducer (EMAT) for non-contact ultrasonic measurements. An EMAT sensor has been miniaturized with an overall receiver size to 1.0 cm diameter. It has been combined with a specially designed low noise preamplifier. Calibration procedures with a Michelson interferometer revealed that the EMAT sensor detected small displacement amplitudes as low as 1.0 ± 0.2 pm in aluminium samples, with a signal bandwidth up to 7.5 MHz (-3 dB). Alternatively, the sensitivity figure can be expressed in terms of a noise-equivalent displacement spectrum as 4.2 × 10 -17 mHz -1/2. The absolute sensitivity of the EMAT was 1.98 ± 0.50 V pm -1 for the detection of longitudinal ultrasonic waves. This sensitivity is compared with other forms of ultrasonic transducer. © 2005 Elsevier B.V. All rights reserved.

KW - Absolute calibration

KW - EMAT

KW - Ultrasonic transducer

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DO - 10.1016/j.sna.2005.12.029

M3 - Article

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JO - Sensors and Actuators, A: Physical

JF - Sensors and Actuators, A: Physical

IS - 2

ER -

A sensitive electromagnetic acoustic transducer for picometer-scale ultrasonic displacement measurements

Abstract

Keywords

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