著者

北川 啓 Hiraku KITAGAWA

出版者

北見工業大学

雑誌

北見工業大学研究報告 (ISSN:03877035)

巻号頁・発行日

vol.9, no.1, pp.p85-89, 1977-11

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The purpose of the present work is to develope the low electric resistance sensor for humidity measurement, because now the hygrometers of electric resistance type have been using the very high electric resistance sensors, and then are very expensive. The d.c. electric resistances of NaCl single crystals were measured by low cost ohmmeter through the electrodes attached on the surfaces of both sides of the creaved NaCl single crystals. The cleaved surfaces have the area of 7.7×7.7 mm^2, and the thickness of crystal was from 1.4 to 5.2 mm. The electrode materials used in this work were nickel, stainless steel and carbon. The measured values of the d.c. electric resistance of NaCl single crystal of 3.1 mm thick ranged between 2 MΩ and 50 KΩ over the range of relative humidities from 45% to 90%. These values did not change for three kinds of electrode materials ; Ni, stainless steel and C.