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An initial review of transducers and calibration methods suitable for airborne ultrasound measurement standards.

Smart, K (1998) An initial review of transducers and calibration methods suitable for airborne ultrasound measurement standards. NPL Report. CMAM 27

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Abstract

NPL's current measurement standards for airborne sound extend to 50 kHz and are realised through the free-field calibration of IEC type LS2 microphones. However applications using sound in air at frequencies well beyond our limit of hearing and beyond 50 kHz are increasing. With this comes the possibility of hazardous exposure. Published guidelines on what is and is not safe are minimal. However, even before these can be set the ability to make reliable measurements at ultrasonic frequencies needs to be established. This report describes a series of measurements that have been made to examine the feasibility of extending the capability of the NPL free-field reciprocity calibration facility. It investigates the current limitations on measurements at higher frequencies and considers alternative transducers on which the measurements could be based. The measurements that have been made extend to 200 kHz.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 27
Subjects: Acoustics
Acoustics > Ultrasound
Last Modified: 10 Sep 2018 14:04
URI: http://eprintspublications.npl.co.uk/id/eprint/1044

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