Device for determining the position of a structural element

Details Device for determining the position of a structural element Device for determining the position of a structural element

1974-07-31

1976-02-03

Smith, Alfred E.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250209, 356171, G01B 1100

Patent

active

039361950

ABSTRACT:
The invention is related to a device for determining the position of a structural element to which is affixed a scale composed of regularly spaced markings which are optically cast onto a line scanner containing regularly spaced photosensitive elements, the spacing between photosensitive elements being a subdivision of the distance between two adjacent markings of the scale. The output of the line scanner is coupled to a processing network which detects shifts in the shadows of the cast markings to evaluate the position of the element with precision. A pulse generator in the processing network provides pulses at a frequency which is a multiple of the rate of scanning of the photosensitive elements for measurement of a subdivision of the distance separating two photosensitive elements of the line scanner to obtain greater precision.

REFERENCES:
patent: 3748043 (1973-07-01), Zipin

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