Zellweger Uster Ag

Rudolf Schwarte

Silvio Mira

A distance measuring apparatus based on a time-of-flight measurement of a light pulse is provided. The apparatus includes a light pulse transmitter having a diode laser and a light pulse receiver having a photodiode. Connected to the photodiode is a pulse amplifier and a pulse detector. The pulse detector includes a delay line connected to the pulse amplifier and having a short-circuited end, a threshold valve and zero crossing detector connected to the delay line at a predetermined distance from its short-circuited end, and a timer circuit. The delay line conducts an electrical pulse from the pulse amplifier to its short-circuited end where the pulse is reflected and inverted. The threshold value and zero crossing detector determines when a combination of the electrical pulse and its inverted copy crosses a threshold value and a zero value.

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Munich, Georgia

Rudolf Schwarte