Mechatronic Systems Engineering 2202A/B Lecture Notes - Lecture 13: Sound Energy, Sintering, Hall Effect
30 Jan 2020
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Optical rotary encoders can use geometric masking, which allows light to pass through unmasked slits (grating) and be detected by photodetectors on the other side of the disk. Designed to produce a digital word that distinguishes 2n distinct positions of the shaft, where. An absolute encoder, yielding 16 distinct outputs, employing the gray-coding scheme: A single transducer may operate as a source/sensor pair. Transducer generates a short burst of high frequency sound. Objects in path of sound are reflected back to sensor. Same transducer acts as a microphone, receiving reflected sound energy and converting it into an electrical signal. Elapsed time between sound pulse and echo are measured. Can sense most materials including wood, plastics, cardboard, glass, grain, granular and powered materials, all metals and most fluids. The active element is formed by two metallic electrodes positioned much like an "opened" capacitor. A conductive target, entering the sensor;s field, forms a counter electrode to the active face of the sensor.
