Optics: measuring and testing – By polarized light examination – With polariscopes
Patent
1980-06-11
1982-06-01
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With polariscopes
356351, 356 31, G01J 400
Patent
active
043324746
ABSTRACT:
A method and apparatus for checking the orientation of crystal plates in a stacked configuration. The plate stack (15) is placed between a polarizer (11) and analyzer (12). A cylindrical lens (13) placed between the stack and analyzer is utilized as a convergent element. Included with the stack are reference plates (17, 18) having known orientation angles representing the upper and lower limits of the desired orientation tolerance. Monochromatic light is made incident on one surface of the plates in the stack through the polarizer. Since the crystals are birefringent, an interference pattern will be produced by light emerging from the opposite surface. Due to the presence of the cylindrical lens, this pattern can be viewed as a series of essentially linear, parallel bands of light. Deviations within a particular band are compared with bands produced by the reference plates to determine if the angle of each plate falls within the desired limits.
REFERENCES:
patent: 1766037 (1930-06-01), Dawson
patent: 2352072 (1944-06-01), Bond
patent: 2497070 (1950-02-01), Coleman
patent: 3052152 (1962-09-01), Koester
Bell Telephone Laboratories Incorporated
Birnbaum Lester H.
Rosenberger R. A.
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