Measurement of methanol solutions using love mode liquid sensor

Controlling the methanol concentration is a key factor in improving the efficiency of the direct methanol fuel cell. In this study, the immersed-type Love mode sensor based on SiO 2 /ST-cut Y-propagation quartz was fabricated for monitoring the methanol concentration. A temperature controlled measur...

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Bibliographic Details
Published in2009 IEEE International Ultrasonics Symposium pp. 637 - 640
Main Authors Yuan-Feng Chiang, Chia-Chi Sung, Cheng-Chiao Tu, Chih-Yung Huang, Ruyen Ro, Ruyue Lee, Sean Wu
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2009
Subjects
Control systems
DMFC
Fuel cells
love wave
Methanol
methanol concentration
Monitoring
Oscillators
sensor
Sensor phenomena and characterization
Spectral analysis
Temperature control
Temperature measurement
Temperature sensors
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Summary:Controlling the methanol concentration is a key factor in improving the efficiency of the direct methanol fuel cell. In this study, the immersed-type Love mode sensor based on SiO 2 /ST-cut Y-propagation quartz was fabricated for monitoring the methanol concentration. A temperature controlled measurement system consisting of a spectrum analyzer and an oscillator circuit was employed to characterize the methanol solutions with different weight concentrations at different temperatures. A theoretical prediction of the phase velocity shift for the methanol solutions with different weight concentrations was also performed for comparison. The results of methanol solutions with different weight concentrations at different temperatures show that the amount of the frequency shift is approximately linearly proportional to the weight concentration, and the proportional rate increases as the temperature increases. The concentration resolutions were 1.1876 and 0.2484 %/kHz by weight at 25°C and 70°C.
ISBN:142444389X
9781424443895
ISSN:1051-0117
DOI:10.1109/ULTSYM.2009.5441679