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/content/asa/journal/jasa/139/6/10.1121/1.4952407
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http://aip.metastore.ingenta.com/content/asa/journal/jasa/139/6/10.1121/1.4952407
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/content/asa/journal/jasa/139/6/10.1121/1.4952407
2016-06-01
2016-12-03

Abstract

This paper presents the foundations of a unidirectional acoustic probe based on the particle velocity gradient. Highly directional characteristics play a key role in reducing the influence of undesired acoustic sources. These characteristics can be achieved by using multiple acoustic sensors in a spatial gradient arrangement. Two particle velocity sensors possessing the figure eight directivity pattern were used in a first-order gradient configuration to yield a unidirectional probe that can reject most excitations originating from both sides and the rear. The effects of key parameters are thoroughly discussed, and the proposed theory is validated in practice.

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