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Abstract

A photoelectric sensor comprises an emitter that generates a light beam modulated using a single-tone or multi-tone continuous wave signal (e.g., a sine wave, square wave, or triangular wave) rather than emitting a high-bandwidth pulsed light signal. Since the light beam is modulated using a single tone signal, the receiver is able to demodulate and evaluate the received optical signal within a narrow band around the fundamental frequency of the signal, thereby achieving greater noise rejection relative to light pulse modulation techniques, which require evaluation over a larger bandwidth. The photoelectric sensor also consumes relatively low power, since the single-tone signal requires less power to generate relative to light pulse modulation techniques.

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First Claim