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 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) |
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EA2012-135 |
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) |
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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 |
6 |
Date of Issue |
2013-01-17 (EA) |
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