MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Detection of Trace Water Vapor Using SiOx-Coated Ball SAW Sensor
Kosuke TakayanagiShingo AkaoTakayuki YanagisawaNoritaka NakasoYusuke TsukaharaSatoshi HagiharaToru OizumiNobuo TakedaToshihiro TsujiKazushi Yamanaka
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2014 Volume 55 Issue 7 Pages 988-993

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Abstract

In manufacturing process of semiconductor, blue light emitting diode (LED), and lithium ion battery, detection and monitoring of trace water vapor (<1 µmol/mol) are significantly important techniques. We have been researching about detection of trace water vapor with high speed and sensitivity by using ball surface acoustic wave (SAW) sensor.
In this paper, we tried to detect trace water vapor by coating silicon oxide (SiOx) on ball SAW sensor using sol–gel method. It was confirmed that SiOx-coated ball SAW sensor could detect water vapor in a wide range from −95 to 0°C in frost point (0.035–6.0 × 103 µmol/mol in concentration) and its response time to frost point change from −70 to −60°C was one half of that of a chilled-mirror hygrometer.

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© 2014 The Japanese Society for Non-Destructive Inspection
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