Gyroscopic Tachometer
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A gyroscopic tachometer is used when a reference point for the measurement of the angular speed is not available; for instance, in space. If the gyroscopic system is rotated around the axis (y-axis) perpendicular to the axis of the spinning flywheel (x-axis), a gyroscopic moment proportional to the measuring angular speed is developed around the z-axis, which is perpendicular to the x- and y-axes. This moment, being sensed by torque- or force-sensing elements, is converted to an electrical output signal.
Gyroscopic tachometer, w = angular speed, x = spin axis, y = input (measurand) axis, z = output axis, 1 = flywheel, 2 = gimbal, 3 and 4 = restraining springs, 5 = damper, 6 = case, 7 = qimbal axis, 8 = torque sensitive element.
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