Optics: measuring and testing – Standard
Reexamination Certificate
2007-06-26
2007-06-26
Pham, Hoa Q. (Department: 2886)
Optics: measuring and testing
Standard
C356S033000, C356S364000
Reexamination Certificate
active
10907344
ABSTRACT:
A method of making a standard tool for calibrating polarimeters that analyze stress in photoelastic material, includes the steps of partially annealing a starting piece of tempered glass so that the starting piece has a retardance below 250 nm/cm, removing a peripheral portion of the starting piece (preferably, at least about 20% of its radial dimension) to leave a working piece, cutting a rectangular parallelepiped from the working piece, polishing two opposing faces of the rectangular parallelepiped where the two opposing faces are spaced apart by a measurement distance through which light passes during stress analysis in a polarimeter, and determining a birefringence of the rectangular parallelepiped across the measurement distance using a calibrated polarimeter. The standard tool is the rectangular parallelepiped having the determined birefringence for the measurement distance. The method can be used to make a set of the standard tools with different measurement distances.
REFERENCES:
patent: 4655589 (1987-04-01), Cestaro et al.
patent: 2003/0076487 (2003-04-01), Cannon et al.
patent: 2006/0164641 (2006-07-01), Russell et al.
Johnson Mary Ann
Johnston David W.
Clark Robert F.
Osram Sylvania Inc.
Pham Hoa Q.
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