User manual

Scan IF Operation

24-28 Scan IF

24.2.6 Using the Scan IF with LC Sensors

Systems with LC sensors use a disk that is partially covered with a damping

material to measure rotation. Rotation is measured with LC sensors by

exciting the sensors and observing the resulting oscillation. The oscillation is

either damped or un-damped by the rotating disk. The oscillation is always

decaying because of energy losses but it decays faster when the damping

material on the disk is within the field of the LC sensor, as shown in

Figure 24−14. The LC oscillations can be measured with the oscillation test or

the envelope test.

Figure 24−14. LC Sensor Oscillations

Damped

Undamped

Envelope

Time