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Paper Abstract and Keywords
Presentation 2013-04-19 11:15
A Water Retention Control System for Humidity Sensing at High Temperature
Tetsuo Tsujioka, Hiroyuki Iyota, Masahito Ohmori, Junko Yamagata (Osaka City Univ.), Michiaki Tanaka, Haruo Kitamura (Miyagawa Kasei) CS2013-7
Abstract (in Japanese) (See Japanese page) 
(in English) Nowadays, the temperature and humidity control of superheated steam have become important research area in food drier, pasteurization and food processing. The authors have studied on economic humidity sensor that it is available even at high temperature of more than 200 degrees. The humidity sensor works based on relationship between dry-bulb and wet-bulb temperatures. To measure accurate wet-bulb temperature, water retention control is necessary for keeping temperature near the thermocouple for wet-bulb uniform inside wet material. The sensor's structure should be also well-considered so as to be suitable for water supply functionality.
In this paper, porous ceramic is newly developed and used as wet material of the humidity sensor because of high durability against high temperature environment. For automatic water retention control, a prototype of the sensor has a water level sensor inside ceramic and a moisture sensor on the surface of the ceramic. The micro-controller operates a pinch valve to control the amount of water from a tank based on the sensor's outputs. We propose its control algorithm and confirm its validity by transfer function analysis. Moreover, the prototype of the sensor is implemented on the food processing machine and an experimental evaluation of the water retention control is made. We also confirm that the moisture sensor on the surface of the ceramic is effective for detecting reliability of the wet-bulb temperature measurements, by additional experiments.
Keyword (in Japanese) (See Japanese page) 
(in English) Thermal engineering / Drying of foodstuff / Wet-bulb temperature / Thermocouple / Moisturizing and water retention control / Moisture detection / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 6, CS2013-7, pp. 35-41, April 2013.
Paper # CS2013-7 
Date of Issue 2013-04-11 (CS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Notes on Review This article is a technical report without peer review, and its polished version will be published elsewhere.
Download PDF CS2013-7

Conference Information
Committee CQ CS  
Conference Date 2013-04-18 - 2013-04-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Sado Island Development Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) SDN (Software-Defined Network), Cloud, Network Virtualization, Service Quality, Contents Delivery, etc 
Paper Information
Registration To CS 
Conference Code 2013-04-CQ-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Water Retention Control System for Humidity Sensing at High Temperature 
Sub Title (in English)  
Keyword(1) Thermal engineering  
Keyword(2) Drying of foodstuff  
Keyword(3) Wet-bulb temperature  
Keyword(4) Thermocouple  
Keyword(5) Moisturizing and water retention control  
Keyword(6) Moisture detection  
1st Author's Name Tetsuo Tsujioka  
1st Author's Affiliation Osaka City University (Osaka City Univ.)
2nd Author's Name Hiroyuki Iyota  
2nd Author's Affiliation Osaka City University (Osaka City Univ.)
3rd Author's Name Masahito Ohmori  
3rd Author's Affiliation Osaka City University (Osaka City Univ.)
4th Author's Name Junko Yamagata  
4th Author's Affiliation Osaka City University (Osaka City Univ.)
5th Author's Name Michiaki Tanaka  
5th Author's Affiliation Miyagawa Kasei Industry, Co. Ltd (Miyagawa Kasei)
6th Author's Name Haruo Kitamura  
6th Author's Affiliation Miyagawa Kasei Industry, Co. Ltd (Miyagawa Kasei)
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Date Time 2013-04-19 11:15:00 
Presentation Time 25 
Registration for CS 
Paper # IEICE-CS2013-7 
Volume (vol) IEICE-113 
Number (no) no.6 
Page pp.35-41 
#Pages IEICE-7 
Date of Issue IEICE-CS-2013-04-11 

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