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Paper Abstract and Keywords
Presentation 2013-01-25 11:20
Theoretical and experimental investigation of influence of preamplifier's shield configuration on free-field reciprocity calibration of WS3 microphones
Hironobu Takahashi, Ryuzo Horiuchi (AIST) EA2012-135
Abstract (in Japanese) (See Japanese page) 
(in English) The free-field sensitivity of a microphone depends on the geometrical configuration of the housing including preamplifier. The sensitivity also depends on stray capacitance inside the microphone and preamplifier. Thus IEC standards provide that the preamplifier shall be inserted into a long cylinder with same diameter as the microphone and shall satisfy requirements on the ground-shield configuration used for the mechanical attachment to the microphone. Other shield configuration called “driven-shield” is often used for general acoustical measurements because it can obtain larger preamplifier output voltage than the ground-shield. Most of preamplifiers commercially available have the same outside diameter as WS1 or WS2 microphones. Thus these microphones can be directly connected to preamplifiers without any adaptor. However, WS3 micro-phone has to be connected to the preamplifier via adaptor to compensate for the diameter difference. Under such conditions, the free-field sensitivity unexpectedly decreased as frequency became higher. In this article, we assumed that this phenomenon is caused by the shield configuration of the preamplifier and we investigated the reason theoretically by circuit simulator and experimentally by electrostatic actuator. It was also revealed that this phenomenon is observed only if the adaptor is used.
Keyword (in Japanese) (See Japanese page) 
(in English) Free-field reciprocity calibration technique / shield configurations / preamplifiers / airborne ultrasound / type WS3 microphones / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 388, EA2012-135, pp. 91-96, Jan. 2013.
Paper # EA2012-135 
Date of Issue 2013-01-17 (EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee US EA  
Conference Date 2013-01-24 - 2013-01-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Kambaikan, Doshisha Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonic and Underwater Acoustics,and Related Topics 
Paper Information
Registration To EA 
Conference Code 2013-01-US-EA 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Theoretical and experimental investigation of influence of preamplifier's shield configuration on free-field reciprocity calibration of WS3 microphones 
Sub Title (in English)  
Keyword(1) Free-field reciprocity calibration technique  
Keyword(2) shield configurations  
Keyword(3) preamplifiers  
Keyword(4) airborne ultrasound  
Keyword(5) type WS3 microphones  
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1st Author's Name Hironobu Takahashi  
1st Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
2nd Author's Name Ryuzo Horiuchi  
2nd Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
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Speaker Author-1 
Date Time 2013-01-25 11:20:00 
Presentation Time 20 minutes 
Registration for EA 
Paper # EA2012-135 
Volume (vol) vol.112 
Number (no) no.388 
Page pp.91-96 
#Pages
Date of Issue 2013-01-17 (EA) 


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