Optical distance measuring apparatus

Details Optical distance measuring apparatus Optical distance measuring apparatus

1992-03-06

1993-04-20

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

052047326

ABSTRACT:
An optical distance measuring apparatus is disclosed which is 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 output from a light receiving portion in response to receipt of a reflected light beam and the electrical phase of a reference signal output from a reference oscillator so as to determine a distance between the apparatus and a object spaced at a distance to be measured with reference to the electrical phase of a local oscillation signal output from a local oscillator. A second circuit system of the processing system on the light receiving side includes a ladder resistance type attenuation circuit, a multiplexer, an veriable gain 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.

REFERENCES:
patent: 4274736 (1981-06-01), Balmer
patent: 4403857 (1983-09-01), Holscher
patent: 4942561 (1990-07-01), Ohishi et al.

Affiliated with

Also associated with

Rating

Optical distance measuring apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical distance measuring apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical distance measuring apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1529258