Abstract
Stability improvement of the output of a quartz-oscillator-based pressure sensor for outdoor use was attempted by maintaining a constant temperature of the preamp connected to the quartz oscillator; this is because the preamp output is affected by temperature, which results in fluctuation of the pressure sensor output. The preamp was located at a place where the temperature is constant, while the quartz oscillator was fixed outdoor where temperature fluctuates. However, the stability of the pressure sensor output was not significantly improved by this method as compared to the other previous procedures to reduce influences of preamp temperature on pressure sensor output, although the fluctuation of preamp temperature was drastically and sufficiently reduced. The results obtained in the present study depict that the fluctuations in pressure sensor output in outdoor use may be attributed to other reasons than the fluctuation of preamp temperature.
