FIELD: visual devices; range finders; IR optical systems.
SUBSTANCE: prism unit has prism and two structure identical wedge compensators mounted in front of input and behind output faces of prism for rotation around axis belonging to main cross-section of prism. At initial position the input face of second compensator is parallel to output face of first compensator. Compensator can be composed of two like wedges glued together. Wedges are made of materials having different dispersion coefficients or refractivity factors. The wedges are connected in such a manner that bigger base of one wedge at main cross-section has to be prolongation of smaller base of the other wedge.
EFFECT: improved precision of prism unit.
8 cl, 1 dwg
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