Category : Sensors, probes, transducers > Piezoelectric sensors

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Piezoelectric gyroscopes are sensors which use piezoelectric oscillators to capture the rotational movements of objects, and are essential for compensating for hand shaking in video and digital still cameras.
The principle of piezoelectric gyroscopes is the same as that of the Foucault pendulum. A piezoelectric element vibrates a rod, which causes it to work as a pendulum. Then, the Coriolis force that occurs when movement is applied is extracted after it is converted into voltage by the piezoelectric element.
A feature of the NEC TOKIN Ceramic gyro is that the vibrating element is made up of a cylindrical piezoelectric ceramic oscillator rod. On this rod, six electrodes are printed and polarized. This structure is as effective as that of a rod carrying three piezoelectric elements. When voltage is applied to the piezoelectric ceramic oscillator rod, it torsionally vibrates. When the rod rotates, it outputs voltages in proportion to the rotational velocity.
The greatest advantage of the structure of the oscillator--a cylindrical ceramic rod--is that it can easily be processed with high accuracy. When conventional square-shape rods were used, it was difficult to accurately make the thickness and horizontal width, as well as the lengthwise and crosswise proportions uniform. On the other hand, high accuracy can be achieved with rods because they can be processed while they are rolled; therefore they are highly effective in downsizing elements with high performance.

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