Development of measuring and monotoring system for CO_2 flux in remote fields using mobile phone

本课题的研究目的是开发一套适用于偏远地区的CO_2通量监测系统。该系统由丙烷气压缩机驱动的小型直流发电机和移动的电池组成，可用于没有交流线路和电话线路的远程测量现场。利用所开发的软件，通过移动的手机将野外CO_2通量测量数据传输到实验室计算机，自动转换为数据库该系统是将实验室的日常数据输入计算机，然后在计算机CRT上自动显示各种图形和表格，并由打印机打印出来。（1）可进行自动和可靠的长期测量。(2)数据记录器、传输设备和其他必要的装置可以保存在靠近测量杆或塔放置的小夏甲盒中。(3)（4）除传感器外，系统的价格约为200万日元，我们还开发了一种特殊的空气采样和数据处理单元。该装置的使用，使波文比法测量CO_2通量所需的两高度CO_2差的长期精确测量成为可能。该系统可以帮助我们了解测量数据和测量设备中发生的情况，然后它可以让我们减少访问现场进行维护工作。在五个不同地点进行的20个月的试运行表明，在偏远地点进行可靠、长期和连续的CO_2通量测量是可能的。

The aim of the research is to develop measuring and monitoring system for CO_2 flux in remote fields. The system is composed of small DC generator which is driven by propane gas conbustion and mobile phpone, then the system is possible to use in remote measurement sites without AC line and telephone line. By the use of the software developed, CO_2 flux measurement data in the fields are transmitted to laboratory computers through mobile phone, converted automatically as a data base (a daily data) in laboratory computer, and then different kinds of graphs and tables are shown automatically on the computer CRT and listed by printer.The other characteristics of the developed system are as follows : (1) automatic and reliables longterm measurements are possible. (2) the data logger, transmitting apparatuses and other necessary devices are possible to keep in small hagar box placed near the measurement pole or tower. (3) on line data transmitting is possible from any laboratories, (4) the price for the system except for sensors is about two million Yen.We also developed a special air sampling and data processing unit. By the use of the unit, the precise and longterm measurement of CO_2 difference between two heights necessary for CO_2 flux measurement by Bowen ratio techniqu became possible. The system helps us to see what is happning in the measured data and measurement eqipments, and then it allowed us to decrease visitting the sites for maintenance work. It was shown by the test runs of total 20 monthes at five different sites that reliable, longterm and continuous measurement of CO_2 flux is possible in remote sites.