Optical distance measuring apparatus

Details Optical distance measuring apparatus Optical distance measuring apparatus

G - Physics

01

S

G01S 17/36 (2006.01)

Patent

CA 2062662

ABSTRACT OF THE DISCLOSURE An optical distance measuring apparatus operable in accordance with a phase difference detecting process wherein a processing system including a central processing unit and a digital type mix-down circuit detects and calculates a phase difference between the electrical phase of a signal outputted from a light receiving portion in response to receipt of a reflected light beam and the electrical phase of a reference signal outputted from a reference oscillator so as to determine a distance between the apparatus and an object to be measured with reference to the electrical phase of a local oscillation signal outputted from a local oscillator is disclosed. A circuit system of the processing system on the light receiving side includes a ladder resistance type attenuation circuit, a multiplexer, an alternate current amplifier, a wave shape correcting circuit and a signal amplitude detecting circuit. When the signal amplitude detecting circuit detects that the signal derived from the reflected light beam has an amplitude in excess of a predetermined value, the central processing unit controls the multiplexer so as to reduce a magnitude of the amplitude. In addition, an optical distance measuring apparatus operable in accordance with a time difference detecting process is disclosed.

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