Optical tests : next stage !
We did launch a new optical metrology company this fall. You'll find optical tests at this page.
Tests reports are written in french only unfortunatly, but the results can be understood anyway and they are much more precise and complete than before for we use professional measurement solutions.
Last Updated (Tuesday, 09 November 2010 15:49)
LX90 Lyot test
This time the LX90, at least it's primary mirror, volunteered for the phase contraste test. As it is a spherical mirror (i.e. no spherical aberration at the radius of curvature), i used my most fine and sensible plate : D 1.8 and 0.3mm width. The 1.8 gave better results than the 1.4 or the 2.1.
It's clean !
I did also the full telescope (Plate+secondary+primary). But the light decomes scarce, a the focus point changes the result depending which optical component you're imaging.
Last Updated (Tuesday, 08 June 2010 17:26)
Bath and Haso compared with a FS-60
I'm just back from Imagine Optic where i was trained to use my incoming Shack Hartmann wavefront analyser. My FS60 was one of the guinea pigs.
Thanks to this, we could make a measurement keeping all the off axis Aberrations.
Last Updated (Thursday, 03 June 2010 18:05)
Takahashi CN212 Lyot test
This test is much more stringent than for the Orion Optics that has been tested previously. With the same protocol as for the OO, nothing shown up. I had to close the slit and take a narrower phase constrast blade to get some defaults. That shows that i need some qualification protocol. Airylab will acquire an adjustable slit some Newport and i just bought a densitometer from Gretag.
The Foucault shows no defect.
With the phase constrast, nothing to be seen with the bare eye. The pictures shows a couple of scratches of no incidence, and some low level bounces. Nevertheless the polishing has been very good, that confirms the star test that gives a very clean diffusion free Airy figure.
Last Updated (Friday, 28 May 2010 22:33)
Lyot test of a Orion Optics 200/900
I tested a one year old Orion Optics mirror with the Lyot test and a Foucault to check the surface aspect.
First contrast test, then the Foucault.
Comparaison between the Bath and the Zygo wavefront :
Last Updated (Wednesday, 26 May 2010 12:58)