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No.36 (1989/12) >

Title :A/D 交換器を用いた簡易型光合成情報処理システム試作(農学科)
Title alternative :A trial production of simple data processing system making use of analog-digital (A/D) conversion board for gas exchange measurement of crop plant (Department of Agriculture)
Authors :野瀬, 昭博
仲間, 操
宮里, 清松
村山, 盛一
Authors alternative :Nose, Akihiro
Nakama, Misao
Miyazato, Kiyomatsu
Murayama, Seiichi
Issue Date :5-Dec-1989
Abstract :作物のガス交換測定系において用いる低コスト情報処理システムを試作した。コストの低減を計るために,簡易型A/D変換器(ネオログ社,PCN-1209-1)を用い,出力用と入力用のGPIBをシステムから除外した。A/D変換器の入力特性から,本システムでは温度の測定にサーミスタ(φ=1.00mm, 宝工業KXK67-1)を用いた。しかし,3連の同化箱を用いて測定を行うのに必要な12本のサーミスタ価格を含めても,試作したシステムの価格は,既製品のA/D変換システムの1/3∿1/4であった。用いたサーミスタの出力電位と温度の関係は,0∿40℃で直線性を有していた(図4)。試作した情報処理システムを用いて,サトウキビ葉身の温度-光合成反応を測定した。得られた結果は高温域に至適温度を有するというC_4光合成特有のものであった。本測定において,試作したシステムを用い葉温を効率よく,かつ正確に制御することができた(図7)。
A simple data processing system for gas exchange measurement of crop plant was produced as a trial product in a laboratory low cost. In order to save the cost, a simple analog-digital (A/D) conversion board (Neolog, PCN-1209-01) was used, but two general purpose interface bus (GPIB) for computer date input and output were excluded in this system. On account of the input range of A/D board, thermister (φ1.00mm, Takara KXK-67) was used for temperature measurements. Including twelve thermisters necessary for a three assimilation chamber system, however, the cost for the trial product was only about one third to a quarter of the price for articles on the market. The thermister in the trial product gave a linear relation between temperature and electric potential in the 10℃ to 40℃ temperature range (Fig. 7). Using the above simple date processing system, photosynthesis-temperature response curves on sugar cane (Saccharamu officinarum, cv. NCo 310) leaf were examined. Curves obatinad in the experiment exhidited a typical response of C_4 photosynthesis in which the optimal was observed at high temperature of 35℃. In the examination, leaf temerature was controlled efficiently and accurately by the system (Fig. 7).
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3870
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.36 p.1 -10
Appears in Collections:No.36 (1989/12)

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