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

研究的目的是开发偏远地区CO_2通量的测量与监测系统。该系统由丙烷气燃烧驱动的小型直流发电机和移动电话组成，可以在没有交流线路和电话线路的远程测点使用。利用开发的软件，将野外co2通量测量数据通过手机传输到实验室计算机，在实验室计算机中自动转换为数据库（日常数据），然后在计算机CRT上自动显示各种图形和表格，并通过打印机列出。开发的系统还具有以下特点：(1)能够实现自动、可靠的长期测量。(2)数据记录仪、传输仪器和其他必要的设备可以放在靠近测量杆或塔的小贮备箱内。(3)可从任何实验室在线传输数据。(4)除传感器外，该系统的价格约为200万日元。我们还开发了一种特殊的空气采样和数据处理装置。通过该装置的使用，可以精确、长期地测量波温比法测量co2通量所必需的两高度间的co2差。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，然后它允许我们减少访问现场进行维护工作。在5个不同站点共20个月的试验表明，在偏远站点可靠、长期、连续地测量CO_2通量是可能的。

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.