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| 电子厂女工xp | 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 {nU=%w"\ %kgkXc~6|x
 High-precision prisms, having maximum angle tolerances ^k<oT'89
 of 1 to 3 arcsec, find increasing application in optical metrology. h<~7"ONhV
 Reported interferometric techniques for measuring O9:U8$*
 the wedge angles of such prisms achieve a precision of up 0Ia($.1mY
 to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques {\[5}nV
 have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric 	k%^lF?_0I
 methods have made use of goniometers,2 dK>7fy;mv
 spectrometers,3 master prisms,4,5 and collimators.6 However, &>H!}"Yk
 in the literature there are few reported methods for )Wb0u0)_
 measuring the pyramidal error, and the majority rely on QNDHOo>v
 visual observation,2,7,8 by which it is only possible to measure _  	84ut
 pyramidal errors to the order of 1 arcmin ~Ref. 8!. U4G`ZKv(!
 In the new arrangement presented here, one can measure TwgrRtj'
 the prism angle and the pyramidal error separately or in fA89|NTSUh
 combination. This is possible because the measurements U!Ek'
 are made simultaneously but with different techniques.
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