Abstract
The method is based on light coming through a first slit (light source), being converted to parallel light through a first lens (collimator), reflected at the surface of the test piece, focussed at a combed sliding shutter through a second lens (condensing lens). The signal measured by a photo-receiver behind the shutter is a measure of image clarity. Optical evenness of the test piece is shown by the ratio of the longitudinal and transverse values when the shutter is appropriately slid.
General information
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Status: WithdrawnPublication date: 1992-10Stage: Withdrawal of International Standard [95.99]
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Edition: 1Number of pages: 5
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Technical Committee :ISO/TC 79/SC 2ICS :25.220.20
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Life cycle
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Previously
WithdrawnISO 2767:1973
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Now
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Revised by
WithdrawnISO 10216:2010