1. Chulalongkorn University,Faculty of Engineering,Department of Electrical Engineering,Bangkok,Thailand
2. Chulalongkorn University,Faculty of Engineering,Dept. of Electrical Engineering and Biomedical Research Center,Bangkok,Thailand
3. Spectroscopic and Sensing Devices Research Group National Electronics and Computer Technology Center,Pathumthani,Thailand
4. Fukuoka University,Faculty of Engineering,Department of Chemical Engineering,Fukuoka,Japan