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Measurements of ultrasonic pest deterrents and an acoustically branded hairdryer: Ambiguities in guideline compliance

Measurements of ultrasonic pest deterrents and an acoustically branded hairdryer: Ambiguities in guideline compliance
Measurements of ultrasonic pest deterrents and an acoustically branded hairdryer: Ambiguities in guideline compliance
Acoustic radiation from three commercial pest deterrents and two hair dryers were measured in an anechoic chamber. The deterrents were chosen because the frequency range at which they emit the most energy is either in the very high-frequency sound band (11.2 kHz - 17.8 kHz) or the ultrasound band (greater than 17.8 kHz). These are sources that may be heard by a subset of the general population, with the young typically having better high frequency sensitivity. A hairdryer reported to increase the frequency of the motor noise above the audible hearing range was compared with a standard hairdryer. The outputs of the deterrents are compared against six international regulations and guidelines for audible and ultrasound exposure. Multiple ambiguities in the application of these guidelines are discussed. These ambiguities could lead to a device being considered as in compliance despite unconventionally high levels. Even if a device measured here meets a guideline, actual exposures are likely to exceed those taken here and may therefore breach guidelines if the listener is closer to the device or reflections increase the exposure level.
0001-4966
2565-2574
Dolder, Craig
b08350be-fd09-4049-95bd-06a9c157a8bc
Fletcher, Mark
ac11588a-fafe-4dbb-8b3c-80a6ff030546
Lloyd Jones, Sian
0295b576-6de4-4d1d-b91a-96aee742fbcb
Lineton, Ben
1ace4e96-34da-4fc4-bc17-a1d82b2ba0e2
Dennison, Sarah
04e83c90-b252-43d6-98b8-c920548db988
Symmonds, Michael
28addbfd-005f-4a55-9877-5e56a657b3b0
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Dolder, Craig
b08350be-fd09-4049-95bd-06a9c157a8bc
Fletcher, Mark
ac11588a-fafe-4dbb-8b3c-80a6ff030546
Lloyd Jones, Sian
0295b576-6de4-4d1d-b91a-96aee742fbcb
Lineton, Ben
1ace4e96-34da-4fc4-bc17-a1d82b2ba0e2
Dennison, Sarah
04e83c90-b252-43d6-98b8-c920548db988
Symmonds, Michael
28addbfd-005f-4a55-9877-5e56a657b3b0
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Dolder, Craig, Fletcher, Mark, Lloyd Jones, Sian, Lineton, Ben, Dennison, Sarah, Symmonds, Michael, White, Paul and Leighton, Timothy (2018) Measurements of ultrasonic pest deterrents and an acoustically branded hairdryer: Ambiguities in guideline compliance. Journal of the Acoustical Society of America, 144 (4), 2565-2574, [2565]. (doi:10.1121/1.5064279).

Record type: Article

Abstract

Acoustic radiation from three commercial pest deterrents and two hair dryers were measured in an anechoic chamber. The deterrents were chosen because the frequency range at which they emit the most energy is either in the very high-frequency sound band (11.2 kHz - 17.8 kHz) or the ultrasound band (greater than 17.8 kHz). These are sources that may be heard by a subset of the general population, with the young typically having better high frequency sensitivity. A hairdryer reported to increase the frequency of the motor noise above the audible hearing range was compared with a standard hairdryer. The outputs of the deterrents are compared against six international regulations and guidelines for audible and ultrasound exposure. Multiple ambiguities in the application of these guidelines are discussed. These ambiguities could lead to a device being considered as in compliance despite unconventionally high levels. Even if a device measured here meets a guideline, actual exposures are likely to exceed those taken here and may therefore breach guidelines if the listener is closer to the device or reflections increase the exposure level.

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Measurements of ultrasonic deterrents and an acoustically branded hairdryer - Accepted Manuscript
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Accepted/In Press date: 27 June 2018
e-pub ahead of print date: 31 October 2018

Identifiers

Local EPrints ID: 421979
URI: http://eprints.soton.ac.uk/id/eprint/421979
ISSN: 0001-4966
PURE UUID: 2d2eee20-1d91-40a0-9679-f024535edd20
ORCID for Craig Dolder: ORCID iD orcid.org/0000-0002-0817-326X
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 12 Jul 2018 16:30
Last modified: 30 Jan 2020 05:07

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Contributors

Author: Craig Dolder ORCID iD
Author: Mark Fletcher
Author: Sian Lloyd Jones
Author: Ben Lineton
Author: Sarah Dennison
Author: Michael Symmonds
Author: Paul White ORCID iD

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