FUTEK TRS-Series - Manual (Page 8)

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3.3. Rotation Angle Measuring System (TRD/TRH/TRS/605/705)
Fig. 6: Diagram showing the design of the rotation angle measuring system
1. Rotating Torque Shaft
2. Pulse Disk
3. Forked Light Barrier with LED and Photo Diode
4. Operation Amplifier
Features:
360 light-dark stripes on the pulse disk
Two forked light barriers shifted by phase angle 90°
Pulse number proportional to the rotation angle