Testing telescope mirrors for micro-ripple

Details Testing telescope mirrors for micro-ripple Testing telescope mirrors for micro-ripple

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jbaa..103..184f&link_type=abstract

Journal of the British Astronomical Association, vol.103, no.4, p.184-185

Physics

Optics

Amateur Telescope Making, Instrumentation, Optics

Scientific paper

The usual tests applied to telescope mirrors are the Foucault knife-edge
tester, the Ronchi grating and the out-of-focus star image. These tests
reveal errors in the overall figure of the mirror, but do not show the
micro-ripples on its surface. This paper presents a method of testing
for micro-ripples that is available to the practical amateur.

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