computer hardware, consumer electronics, electronic components

Angular velocity sensor

Linear velocity sensors may play a very important role in the control of any mechanical system motion, or vibration that may be encountered by the mechanical system. There are various types of angular velocity sensors (gyro sensors) depending on the method of operation. The angular velocity sensors are chiefly classified into a mechanical type utilizing the precession of a rotary body, an optical type that utilizes change in the timing of light reception due to the rotation of laser light that is rotated in an enclosure, a fluid type sensing a hot wire temperature representing an injection amount of a sensing gas changing in accordance with the rotation of a casing when the sensing gas is injected to a hot wire in the casing. Recently, demand for angular velocity sensors for vehicle direction detection in car navigation systems or the like has been rapidly increased. As a result, vibration type angular velocity sensors that are inexpensive and lightweight as compared with the above-mentioned types are going mainstream. The vibration type angular velocity sensors are generally arranged to detect the angular velocity electronically from a displacement of a vibratory member under the influence of Coriolis force which is known to be proportional to the angular velocity, through the use of piezoelectric elements located in association with the vibratory member. The vibration gyro-type angular velocity sensor has a rod-shaped vibrator and a piezoelectric element. The vibrator is vibrated at a predetermined resonant frequency. The piezoelectric element detects the Coriolis force generated due to the angular velocity. The sensor determines the angular velocity from the Coriolis force.


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