Measuring with microscope

Details Measuring with microscope Measuring with microscope

1975-12-22

1977-10-18

Corbin, John K.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

356170, 356252, G01B 904, G01B 1104

Patent

active

040543870

ABSTRACT:
A measurement module projects into a microscope a fiduciary image having a visually extensive area. Measurements are made by translating the fiduciary relative to the object between two positions in which different fiduciary image boundaries are tangent to respective object image sides, as determined by null positions in which neither dark overlap nor bright separation zones appear between the two semi-transparent images. The width of the object can be determined from the distance of relative movement of the fiduciary between these positions. In preferred form the fiduciary image has first and second boundaries in fixed relation at a predetermined spacing and the measurement is corrected by the spacing between the two fiduciary boundaries.

REFERENCES:
patent: 3068743 (1962-12-01), Dyson
patent: 3288021 (1966-11-01), Hopkins
patent: 3326079 (1967-06-01), Dyson et al.
patent: 3973713 (1976-08-01), Furuya et al.
Dyson "The Precise Measurement of Small Objects", AEI Engineering, vol. 1, No. 1, Jan. 1961.

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