ENVR 47 |
| This work presents the development of a prototype of a sensor for platform environmental networks. The measurement node is designed as a floater. It is equipped with DO, pH and turbidity optical sensors. The pH sensor can be easily replaced by a CO2 sensor. The sensors are mounted outside on a window. Inside, the platform houses readout optics and electronics equipped with analog-to-digital converter, microcontroller and transmitter in a waterproof case. The prototype provides reading of O2, pH and turbidity every 15 minutes. It is able to operate from AA size alkaline batteries for an extended period of time. The data are received by a base station, which is operated by a PC (laptop). The base station can address up to 65,000 nodes. The sensor node is miniature in size (3”x3”x3” sensing head and electronics, 4”x4”x1” battery pack), consumes very little power and is low cost. The built-in transmitter has a range of ~1 km and the transmission rate is 2.4 kbps. The sensor platform prototype is able to withstand continuous field deployment in streams and/or riparian areas. The anti-biofouling protection and the longevity of the platform are discussed. |
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Recent Developments in Sensors and Sensor Networks for Contaminants in Environmental Systems
8:30 AM-11:45 AM, Monday, August 20, 2007 Boston Park Plaza -- Beacon Hill Rm, Oral
Division of Environmental Chemistry |