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Motion Sensor. Muhajir Ab. Rahim School of Mechatronic Engineering, KUKUM. Introduction. Designed to measure the rate of change of position, location, or displacement of an object that is occurring.
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Motion Sensor Muhajir Ab. Rahim School of Mechatronic Engineering, KUKUM
Introduction • Designed to measure the rate of change of position, location, or displacement of an object that is occurring. • The primary form of motion sensor is the accelerometer that can provide acceleration, speed (or velocity), and position information.
Type of Motion • Rectilinear • Angular • Vibration • Shock
Accelerometer Principles • In applications that involve flight, such as aircraft and satellites, accelerometers are based on properties of rotating masses. • In the industrial world, however, the most common design is based on a combination of Newton's law of mass acceleration and Hooke's law of spring action.
Accelerometer Principles • Newton’s Law • Hooke’s Law
Types of Accelerometer • Potentiometric • LVDT • Variable Reluctance • Piezoelectric
Piezoelectric • Based on property exhibited by certain crystals where a voltage is generated across the crystal when stressed • When exposed to acceleration, the test mass stresses the crystal by a force (F=ma), resulting in a voltage generated across the crystal
