摘要 |
An optical position sensor for monitoring displacements of a movable body is disclosed. The sensor includes a light source transmitter, a light sensing receiver, a digital switching device, and a special encoder plate attached to a movable body. The encoder plate has rows of apertures which are constructed to modulate the light signal transmitted between the transmitter and receiver as a function of plate position to provide a symmetrical digital output signal when the switching device is triggered at a preset practical minimum threshhold level. Fiber optics are particularly suitable for use in constructing such an optical position sensor.
|