Electronic leveling apparatus and leveling staff used with the s

Details Electronic leveling apparatus and leveling staff used with the s Electronic leveling apparatus and leveling staff used with the s

1996-10-07

1998-04-21

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

33293, 356375, 356401, G01C 308, G01C 1502, G01B 1100

Patent

active

057423784

ABSTRACT:
An electronic leveling apparatus and associated leveling staff are designed to form an image of scale patterns of the leveling staff on a photo-electric transducer by means of a telescopic optical system, convert the image into an electrical signal with the transducer and implement the Fourier transformation for the signal with a signal processor, thereby having functions of focusing control and abnormality detection. The leveling staff has an alignment of the first and second (and third) scale patterns aligned in order cyclically at a constant pitch along the length measuring direction, with the first and second patterns having their widths varied in different cyclic periods and the third pattern having a constant width.

REFERENCES:
patent: 4488050 (1984-12-01), Iwafune
patent: 4715714 (1987-12-01), Gaechter et al.
patent: 4778273 (1988-10-01), Michel

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