Development of Compact CO_2 Monitoring System in the Coastal Area.

我们已经在现场测试了该系统：石垣岛，琉球西南部。该系统引入气体渗透膜管作为平衡器，采用NDIR进行测量。该系统已成功地实现了体积、重量和功耗的降低：30 kg、50×50×50 cm和300W。系统的稳定性在0~1000ppm的范围内小于×5ppm，足以用于CO_2变化较大的海岸带监测。将该系统与静态混合器/气泡式平衡器进行了比较。测得的CO_2值相差20ppm。这种差异是由于船体摆动引起的静力混合器/气泡式平衡器内部压力的变化造成的。我们的系统带有膜平衡器，更稳定。经过3年的研究，研制成功了紧凑型CO_2监测系统，并进行了基本设计和实际测试。我们正在不断完善这个系统，以使其得到更广泛的应用。

We have tested the system in the field : Ishigaki Island, the southwest Ryukyus. The system introduces a gas permeable membrane tube as the equilibrator with NDIR for measurement. It has been succeeded in reducing size, weight and power consumption : 30kg, 50x50x50cm and 300W.The stability of the system is less than *5 ppm within a range of 0 to 1000 ppm, which is enough for coastal zone monitoring where a large change in CO_2 occurrs. We compared the system with a static mixer/bubble type equilibrator. The measured CO_2 values differed with each other as much as 20 ppm. This discrepancy resulted from the changes in pressure inside the equilibrator of static mixer/bubble type by swing of the boat. Our system with a membrane equilibrator is more stable. Through the 3-year research, the development of a compact CO_2, monitoring system has been succeeded for its basic designation and practical test. We continue to brush up this system to be more widely used one.