The draft beer fermentation process was monitored by using electronic nose. The system used the seven types of generally commercial metal oxide gas sensor in array. The selected process was one of the commercial processes and the data were gathered every hour for 10 day process which was 240 steps. It was processed for monitoring the chemical reaction for quality control. The results showed the good difference of the chemical reaction of the each day very clearly. The signature processing showed the variance 98.78 %, 96.55 % of the first component (PC1) and 2.3 % of the second component (PC2), which was sufficiency for data explanation in 2D plot. It would be useful for production process to ensure a quality standard.

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This research presents the multi-sensor that can detect both magnetic field and photo in the one device. The structure is based on p-n junction diode that is the fundamental of light detecting. The idea is how to design p-n junction for magnetic field. The dual magneto diode structure is a solution. It is designed to be suitable for these purposes. The device is specially designed and simulation by Sentaurus TCAD. It is fabricated by standard CMOS process and measured the responses of magnetic field and light. It shows a good device that detects two types of energy equally well. The relative sensitivity of magnetic response is 57 mT -1 at forward bias 1 mA and 128 mT -1 at reverse 8 nA. The dark current of device is 7.34 mA at standard test condition (25ºC, AM 1.5, 100 W/m2). It is current mode device generating photo current and cathode current difference that is linearly induced from magnetic field.

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