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Paper Abstract and Keywords
Presentation 2022-12-22 16:50
[Poster Presentation] Selection of light sources and amplification with fiber amplifier in fiber optic reflection ultrasonic probe
Jumpei Hayakawa, Yuji Wada, Kentaro Nakamura (Tokyo Tech) US2022-60
Abstract (in Japanese) (See Japanese page) 
(in English) Currently, application of high intensity airborne ultrasound in high frequency band is expanding. For evaluating such intense sound filed, conventional 1/8-inch condenser microphone has some problems especially in measuring standing waves such as the finite size, toughness of the membrane, and necessity of regular calibration. Thus, fiber optic reflection ultrasonic probe has been used as an alternative method. However, its use is limited to very high intensity sound field due to the low sensitivity. In this report, we examine the selection of light sources and the effectiveness of amplification in the reflected light signal for improving SN ratio. Regarding the selection of the light sources, ASE, SLD, and LD were tested. Being based on the experimental comparison of the intrinsic noise of the light sources and the SN ratio in the sound pressure measurements, the ASE and SLD light sources were found to be suitable for the current measurement system. Then, the effectiveness of the amplification was verified for fiber amplifier inserted before the photo detector and electric amplifier connected to the photo detector. SN ratio with the fiber amplifier was improved up to 5.6 dB, while the SN ratio without the fiber amplifier was -2.0 dB. It was found that the optical amplification of the reflected light was more effective than the electrical amplification of the photo detector signal. Compared to an electric amplifier, optical fiber amplifier exhibited better SN ratio and enabled measurements at lower sound pressure.
Keyword (in Japanese) (See Japanese page) 
(in English) optical fiber / ultrasonic probe / airborne ultrasonic wave / sound pressure measurement / fiber amplifier / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 323, US2022-60, pp. 50-55, Dec. 2022.
Paper # US2022-60 
Date of Issue 2022-12-15 (US) 
ISSN 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 US2022-60

Conference Information
Committee EA US  
Conference Date 2022-12-22 - 2022-12-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Satellite Campus Hiroshima 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2022-12-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Selection of light sources and amplification with fiber amplifier in fiber optic reflection ultrasonic probe 
Sub Title (in English)  
Keyword(1) optical fiber  
Keyword(2) ultrasonic probe  
Keyword(3) airborne ultrasonic wave  
Keyword(4) sound pressure measurement  
Keyword(5) fiber amplifier  
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Keyword(8)  
1st Author's Name Jumpei Hayakawa  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Yuji Wada  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Kentaro Nakamura  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2022-12-22 16:50:00 
Presentation Time 120 minutes 
Registration for US 
Paper # US2022-60 
Volume (vol) vol.122 
Number (no) no.323 
Page pp.50-55 
#Pages 6 
Date of Issue 2022-12-15 (US) 

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