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Entry  Thu Feb 21 18:44:18 2013, Koji, Optics, Configuration, Perpendicularity test perpendicularity_test.pdfP2203206.JPG
    Reply  Wed Feb 27 18:18:48 2013, Koji, Optics, Configuration, More perpendicularity test 
       Reply  Fri Mar 1 23:06:15 2013, Koji, Optics, Configuration, More perpendicularity test final 
Message ID: 63     Entry time: Thu Feb 21 18:44:18 2013     Reply to this: 64
Author: Koji 
Type: Optics 
Category: Configuration 
Subject: Perpendicularity test 

Perpendicularity test of the mounting prisms:

The perpendicularity of the prism pieces were measured with an autocollimator.

Two orthogonally jointed surfaces forms a part of a corner cube.
The deviation of the reflected image from retroreflection is the quantity measured by the device.

When the image is retroreflected, only one horizontal line is observed in the view.
If there is any deviation from the retroreflection, this horizontal line splits into two
as the upper and lower halves have the angled wavefront by 4x\theta. (see attached figure)

The actual reading of the autocollimator is half of the wavefront angle (as it assumes the optical lever).
Therefore the reading of the AC times 30 gives us the deviation from 90deg in the unit of arcsec.

SN / measured / spec

SN10: 12.0 arcsec (29 arcsec)

SN11: 6.6 arcsec (16 arcsec)

SN16: 5.7 arcsec (5 arcsec)

SN20: -17.7 arcsec (5 arcsec)

SN21: - 71.3 arcsec (15 arcsec)

 

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