Sains Malaysiana
40(1)(2011): 27–33
Effect of BaAl2O4 Addition
on Power Consumption and Oxygen Sensing Response of Er123 Ceramic Rods
Utilizing Hot-Spot Phenomenon
(Kesan Penambahan
BaAl2O4 pada Penggunaan Kuasa dan Respon Pengesanan
Oksigen pada Rod Seramik Er123 Menggunakan Fenomena Titik Panas)
M.
Hassan & A.K. Yahya*
Faculty
of Applied Sciences, Universiti Teknologi MARA
Shah
Alam, Selangor D.E., Malaysia
T.
Okamoto
Department
of Electrical Engineering
Nagaoka
University of Technology, Niigata, Japan
Diserahkan:
7 Disember 2009 / Diterima: 13 Julai 2010
ABSTRACT
In this paper, we report
the effect of BaAl2O4 addition
(0-30 wt. %) on power consumption and oxygen sensing response of hot-spots
developed on short Er123 ceramic rods of around 12 mm length synthesized using
standard solid-state reaction. All the sensor rods showed increase in output
current with increasing voltage followed by sudden reduction in output current
and appearance of hot spot. After appearance of hot spot, for each rod, output
current was observed to decrease gradually with increasing voltage with the
slope of the I-V curve gradually approaching zero. Output current after the hot
spot formation showed sensitivity to oxygen partial pressure, pO2 between
1 to 100 kPa. Addition of 30 wt. % BaAl2O4 reduced
the fluctuation of current and increased the sensitivity for pO2 below
10 kPa. In addition, overshoot current was also reduced and resulted in
improvement of response time from around 10 s to 5 s. Our result also showed
that minimum power consumption was significantly reduced in the Er123 rods with
30 wt. % BaAl2O4.
Keywords: Er123; hot spot;
oxygen sensor
ABSTRAK
Dalam kertas ini, kami
melaporkan kesan penambahan BaAl2O4 (0-30
wt. %) pada penggunaan kuasa elektrik dan respon pengesanan oksigen di titik
panas yang terbentuk pada rod seramik Er123 pendek sekitar 12-mm yang
disintesis menggunakan tindak balas keadaan pepejal piawai. Semua rod pengesan
menunjukkan pertambahan arus output dengan bertambahnya voltan diikuti pengurangan
mendadak arus output dan kemunculan titik panas. Selepas kemunculan titik
panas, untuk setiap rod, arus output dicerap mengurang beransur-ansur dengan
bertambahnya voltan dengan kecerunan lengkung arus-voltan beransur-ansur
mendekati sifar. Arus output selepas pembentukan titik panas menunjukkan
kepekaan pada tekanan separa oksigen, pO2 antara
1 hingga 100 kPa. Penambahan 30 wt. % BaAl2O4 mengurangkan
turun naik arus dan menambahkan kepekaan pada pO2 di
bawah 10 kPa. Tambahan lagi, ayunan lampau arus dikurangkan dan menghasilkan
peningkatan masa respon dari sekitar 10 s ke 5 s. Keputusan juga menunjukkan
penggunaan kuasa minimum dikurangkan dengan ketara bagi rod Er123 dengan 30 wt.
% BaAl2O4.
Kata kunci: Er123;
pengesan oksigen; titik panas
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*Pengarang untuk
surat-menyurat; email: ahmad191@salam.uitm.edu.my
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