Wireless Remote Weather Monitoring System Based on MEMS Technologies

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Wireless Remote Weather Monitoring System Based on MEMS Technologies
出版類型SCI(Sciences Citation Index)
AuthorsRong-Hua Ma, 馬榮華, Yu-Hsiang Wang 王禹翔, & Chia-Yen Lee 李佳言
出版日期2011 / 3

This study proposes a wireless remote weather monitoring system based on Micro-Electro-Mechanical Systems (MEMS) and wireless sensor network (WSN) technologies comprising sensors for the measurement of temperature, humidity, pressure, wind speed and direction, integrated on a single chip. The sensing signals are transmitted between the Octopus II-A sensor nodes using WSN technology, following amplification and analog/digital conversion (ADC). Experimental results show that the resistance of the micro temperature sensor increases linearly with input temperature, with an average TCR (temperature coefficient of resistance) value of 8.2 × 10?4 (°C?1). The resistance of the pressure sensor also increases linearly with air pressure, with an average sensitivity value of 3.5 × 10?2 (Ω/kPa). The sensitivity to humidity increases with ambient temperature due to the effect of temperature on the dielectric constant, which was determined to be 16.9, 21.4, 27.0, and 38.2 (pF/%RH) at 27 °C, 30 °C, 40 °C, and 50 °C, respectively. The velocity of airflow is obtained by summing the variations in resistor response as airflow passed over the sensors providing sensitivity of 4.2 × 10?2, 9.2 × 10?2, 9.7 × 10?2 (Ω/ms?1) with power consumption by the heating resistor of 0.2, 0.3, and 0.5 W, respectively. The passage of air across the surface of the flow sensors prompts variations in temperature among each of the sensing resistors. Evaluating these variations in resistance caused by the
temperature change enables the measurement of wind direction.

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