Optical displacement measuring system using a triangulation including a processing of position signals in a time sharing manner

An optical displacement measuring system using a triangulation comprising:

• a light projecting means for emitting a light beam, which is amplitude-modulated by a reference signal having a predetermined period, to an object;
• a position signal generator for receiving light reflected by said object and providing a pair of first and second position signals;
• a control signal generating means for providing first and second control signals in synchronism with said reference signal;
• a first switching means for processing said first and second position signals in a time sharing manner according to said first control signal to obtain a first composite signal, in which said first and second position signals occur alternately and occur once every n periods of said reference signal, where n is a positive integer;
• a single amplifying means for amplifying said first composite signal at a desired amplification rate;
• and
• a distance determining means for periodically reversing the polarity of said first composite signal provided from said amplifying means according to said second control signal so as to obtain a second composite signal, and determining a distance between said light projecting means and said object from said second composite signal.