Electrolytic Tilt Sensor with Domed Cap for Improved Performance

In recent years, some efforts have been made in our laboratory to improve the performance of previously reported electrolyte-based tilt sensors. Even though the previously reported electrolytic tilt sensors have merits of low cost and a simple fabrication process, they show several undesirable performances such as inconsistent response time and slow reversion when it returns to the initial position (inclination angle of 0°) from an arbitrary tilted position. The irregular performances are caused by the flat upper cover. In this paper, we report the design and fabrication of an electrolytic tilt sensor with a domed cap for improving the response time and instant reversion. For a fast and regular reversion, the cavities on the cap substrate have been designed to be a domed shape. The measured reversion time with the proposed tilt sensor from 10° to the initial state was approximately 0.3 s, which is more than 6 times faster than the previously reported one.