Smart Car with Security Camera for Road Accidence Monitoring

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.

Section: Tilt Sensor Design and Operation Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrolytic Tilt Sensor with Domed Cap for Improved Performance

Choi

Lee

et al. 2013

“…Recently, there has been an increasing number of new applications for motion sensors, within portable devices such as smartphones, notebooks, and tablet PCs. 1,2) For example, they are used for the rapid detection of abnormal movements (such as impacts and falls) in notebook computers, and offer protection by stopping all read and write operations and quickly moving the hard disk's magnetic head to a safe position before the computer hits the floor. They are also used to detect the tilted orientation of a mobile phone screen and adjust the display image accordingly.…”

Section: Introductionmentioning

confidence: 99%

Effect of heater geometry and cavity volume on the sensitivity of a thermal convection-based tilt sensor

Han

Kim

Kong

et al. 2018

This paper reports a micro-electro-mechanical-system (MEMS)-based tilt sensor using air medium. Since the working mechanism of the sensor is the thermal convection in a sealed chamber, structural parameters that can affect thermal convection must be considered to optimize the performance of the sensor. This paper presents the experimental results that were conducted by optimizing several parameters such as the heater geometry, input power and cavity volume. We observed that an increase in the heating power and cavity volume can improve the sensitivity, and heater geometry plays important role in performance of the sensor.

“…Tilt sensors are widely applicable in the fields of aviation, automation (machine control and industrial process monitoring), seismic monitoring, and game control, and more especially in automotive applications such as chassis regulation or active car suspension. [1][2][3][4][5][6][7] In particular, miniaturized tilt sensors widen their application fields even to mobile electronic devices, which require a functionality of motion capture. The development of a tilt sensor with low power consumption, small size, and wide operating range would further broaden the scope of these applications.…”

Section: Introductionmentioning

confidence: 99%

A MEMS tilt sensor with expanded operating range and improved sensitivity

Choi

Kong

2014

In this paper, a simple and novel method of expanding the operating range of inclinations and of increasing the sensitivity of convection-based tilt sensors is shown. Even though the previously reported convective tilt sensors fabricated in our laboratory have their own merits in performing dual-axes inclination measurement with excellent linearity and symmetric sensitivity, they showed limited operating range from −90 to 90° because of their structural limitations. However, this proposed tilt sensor has overcome the structural limitations and it detects inclinations wider than the ±90° range on two axes with symmetric sensitivity. The improved performance could be achieved by removing the membrane at the bottom of the microheater and temperature sensors for unlimited gas movement in the cavity when it tilted over the ±90° range. The operating range of the newly proposed tilt sensor expands to ±180° compared with that of the previously reported convective tilt sensor. Moreover, various designs of cavities and cap substrates were adopted to improve the sensitivity of the proposed convective tilt sensor. The mass production of the proposed convection-based tilt sensor is still feasible because it can be fabricated at a low cost because of its simple fabrication step. Its sensitivity is high and it has a very wide-angle detection range.