초록 ▼

A system is disclosed for non-contact distance or thickness measurements. A deflectable laser beam scans the object and produces a measuring impulse during a forward and reverse motion when the laser beam hits a point on an object along a sighting line of a measuring detector. A rectangular pulse is

A system is disclosed for non-contact distance or thickness measurements. A deflectable laser beam scans the object and produces a measuring impulse during a forward and reverse motion when the laser beam hits a point on an object along a sighting line of a measuring detector. A rectangular pulse is produced from each measuring pulse and rising or falling edges of the rectangular pulse are used for measurement. The impulse widths and possible store times of the evaluation circuitry do not influence the measuring result in the system disclosed.

대표청구항 ▼

A system for measuring the distance of a point on a surface of an object from a zero plane, comprising: a sharply focused light beam; beam deflector means for periodically deflecting the light beam in one direction and then a reverse direction over a measuring area in which the object is arranged, a

A system for measuring the distance of a point on a surface of an object from a zero plane, comprising: a sharply focused light beam; beam deflector means for periodically deflecting the light beam in one direction and then a reverse direction over a measuring area in which the object is arranged, a point on the object being located on a predetermined line of sight during both directions of scan; a measuring photo-detector means for receiving light only along said predetermined line of sight and for providing a measuring pulse at a measuring time when the point on the object surface is hit by the light beam; means providing a reference pulse at a reference time when said beam deflector means deflects the light beam towards a zero plane point located on said predetermined line of sight; pulse former means for converting measuring pulses of the measuring photo-detector means into rectangular pulses; said measuring photo-detector means producing a first measuring pulse and said pulse former means producing a corresponding first rectangular pulse during deflection movement of the light beam by said deflector means in the one direction; said measuring photo-detector means producing a second measuring pulse and said pulse former means producing a corresponding second rectangular pulse during deflection movement of the light beam by said deflector means in the reverse direction; and means for determining a time difference representative of the distance from a comparison of corresponding same side edges of the first and second rectangular pulses with reference times produced during deflection of the light beam in the one and in the reverse directions.