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Paper Abstract and Keywords
Presentation 2010-08-10 14:30
Application of Total Reflection to Microphone
Yasushi Suzuki (Gunma Nat. Coll. Tech.), Ken'iti Kido (Prof. Emer. Tohoku Univ.) EA2010-56
Abstract (in Japanese) (See Japanese page) 
(in English) A new microphone, which uses the optical total reflection at the curved interface between glass and air, is proposed in this paper. The critical angle for total reflection changes by the refractive index of air, which depends on the air density. The density changes by the sound pressure. Therefore, the sound pressure is measurable by detecting the intensity of the reflected light from the total reflection area. The microphone has no limitation in the frequency range and can be used for the measurement of great volume of sound as the mechanical vibration is not used. The sound pressure sensitivity of the microphone is investigated theoretically and some experiments are carried out to verify the theoretical investigations. A method to compensate the reduced sensitivity incurred by the fluctuation of atmospheric pressure or temperature is presented.
Keyword (in Japanese) (See Japanese page) 
(in English) Microphone / Total reflection / Curved interface / Refractive index / Broadband / High sound pressure / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 171, EA2010-56, pp. 75-80, Aug. 2010.
Paper # EA2010-56 
Date of Issue 2010-08-02 (EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF EA2010-56

Conference Information
Committee EA  
Conference Date 2010-08-09 - 2010-08-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustic Signal Processing, Psychological and Physiological Acoustics, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2010-08-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Application of Total Reflection to Microphone 
Sub Title (in English)  
Keyword(1) Microphone  
Keyword(2) Total reflection  
Keyword(3) Curved interface  
Keyword(4) Refractive index  
Keyword(5) Broadband  
Keyword(6) High sound pressure  
Keyword(7)  
Keyword(8)  
1st Author's Name Yasushi Suzuki  
1st Author's Affiliation Gunma National College of Technology (Gunma Nat. Coll. Tech.)
2nd Author's Name Ken'iti Kido  
2nd Author's Affiliation Professor Emeritus of Tohoku University (Prof. Emer. Tohoku Univ.)
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Speaker Author-1 
Date Time 2010-08-10 14:30:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2010-56 
Volume (vol) vol.110 
Number (no) no.171 
Page pp.75-80 
#Pages 6 
Date of Issue 2010-08-02 (EA) 

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