水晶振動子圧力センサ出力の安定性改善のためのプリアンプへの温度の影響低減

摘要

温度安定型水晶振動子を用いた圧力センサのプリアンプ部への温度対策を行い，水晶振動子圧力センサ出力への温度の影響を低減することを試みた.温度対策によるプリアンプ部 への温度変化の低減により，一定の安定性の向上は見られたが，水素センサとしての実用化を図る上で必要となる安定性を得るには至らず，特に低い温度における温度の影響を排除する必要があることがわかった.本研究は科学研究費補助金基盤研究C, 24560070号により行われた.%The stability of the output of a pressure sensor using a temperature-stable quartz oscillator for outdoor use was improved. This was accomplished by reducing the temperature change in the preamp of the pressure sensor using a thermal insulation bag for the preamp. The thermal insulation bag reduced the change in temperature at the preamp by approximately several degrees centigrade. Thus, fluctuations in the output from the pressure sensor were suppressed, with increasing average atmospheric temperature. The method used in this study was less effective at lower atmospheric temperatures, probably because of the preamp temperature dependence of the pressure sensor output. It can be concluded that the method used in this study is not sufficiently effective at all atmospheric temperatures to reduce fluctuations in the output from the pressure sensor below 0.33%, which is the necessary level for practical use of a hydrogen sensor in outdoor environments.