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2024-05-14 08:52 |
Measuring the angles and pyramidal error of high-precision prisms
Measuring the angles and pyramidal error of high-precision prisms B{IYVviiP
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High-precision prisms, having maximum angle tolerances ;DWtCtD
of 1 to 3 arcsec, find increasing application in optical metrology. S,&tKDJn
Reported interferometric techniques for measuring c-S_{~~
the wedge angles of such prisms achieve a precision of up X I6L PA0%
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques 0fc]RkHs"
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric Efo,5
methods have made use of goniometers,2 _ PC}`Y'&
spectrometers,3 master prisms,4,5 and collimators.6 However, UPtWj8h
in the literature there are few reported methods for y?BzZ16\bL
measuring the pyramidal error, and the majority rely on ni @Mqb
visual observation,2,7,8 by which it is only possible to measure cZ$!_30N+
pyramidal errors to the order of 1 arcmin ~Ref. 8!. rSTc4m1R
In the new arrangement presented here, one can measure bJ8~/d]+
the prism angle and the pyramidal error separately or in z?C;z7e T
combination. This is possible because the measurements **I9Nw!IH
are made simultaneously but with different techniques.
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