Measuring the angles and pyramidal error of high-precision prisms sT^R0Q'>
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High-precision prisms, having maximum angle tolerances 'f( CN3.!
of 1 to 3 arcsec, find increasing application in optical metrology. u8-6s+
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Reported interferometric techniques for measuring (*S<2HN5
the wedge angles of such prisms achieve a precision of up u)@:V)z
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques pGs?Y81
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric JL M Xkcc
methods have made use of goniometers,2 ~F"S]
spectrometers,3 master prisms,4,5 and collimators.6 However, M9iX_4
in the literature there are few reported methods for H^d?(Svh
measuring the pyramidal error, and the majority rely on /.]u%;%r[
visual observation,2,7,8 by which it is only possible to measure E ; Z(v
pyramidal errors to the order of 1 arcmin ~Ref. 8!. +ktv : d
In the new arrangement presented here, one can measure &gCGc?/R#
the prism angle and the pyramidal error separately or in
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combination. This is possible because the measurements r8 9o
are made simultaneously but with different techniques.
