A5.4 - Unidirectional Acoustic Sensor Based on the Particle Velocity Gradient
- Event
- AMA Conferences 2015
2015-05-19 - 2015-05-21
Nürnberg, Germany - Band
- Proceedings SENSOR 2015
- Chapter
- A5 - Acoustic Sensing
- Author(s)
- S. Yu, Y. Yang - Northwestern Polytechnical University, Xi’an (China), G. Carrillo Pousa, D. Fernández Comesaña - Microflown Technologies, Arnhem (The Netherlands)
- Pages
- 124 - 129
- DOI
- 10.5162/sensor2015/A5.4
- ISBN
- 978-3-9813484-8-4
- Price
- free
Abstract
Particle velocity sensors have a directivity pattern of “figure-of-eight”, whose sensitivity is proportional to the cosine of the sound angle of arrival. Similar to the sound pressure gradient probe, a first order particle velocity gradient probe could be created by using two closely spaced particle velocity sensors. The combination of the properties of both particle velocity sensors and a first order particle velocity gradient can yield to a unidirectional particle velocity sensor which can play a key role in many cases
where the rejection of the acoustic excitation coming from undesired directions is critical. The aim of this work is to summarize the theory of unidirectional particle velocity sensors both in frequency domain and time domain, and demonstrate it experimentally with two closely spaced particle velocity sensors.