Articles and presentations

Dobson Slide bearings
Physical foundation for dimensioning Dobson slide bearings, including calculated examples.
Thermal modeling of telescope mirrors
Explores various models that estimate the transient temperature gradients inside a telescope mirror, specifically during the cooldown phase prior to the actual use.
Polishing model
This derives a model in excel describing the polishing action for ToT circular strokes with sub-diameter tools. The model is applied and verified in practise.
Parabolization supported by interferometry
Presentation at the Optics day 2019, TNO premises in Delft. It shortly explains the working of a Bath interferometer and DFTFringe, gives a working model for manual ToT polishing and concludes with the application of this during the parabolization phase of a telescope mirror..
Bath interferometry
An introduction to the background, construction and use of a Bath interferometer.
While the Foucault test fails to give objective results, Bath interferometry sets the new standard for amateur mirror makers. Thorough evaluation of Foucault test consistency is given in this article by Jan van Gastel.
Schiefspiegler toolkit
A summary of the treaty on two-mirror Tilted Component Telescopes by Anton Kutter. This is presented in the form of a design guideline, used to estimate the dimensions and characteristics of a target system. The results can then be optimized with ray-tracing software. Click for the schief_kit.xlsx and K130F27-anastigmat.len files.
A reformatted and corrected version of the original Kutter article can be found here.
Focal plane illumination
An excercise to calculate the combined vignetting of secondary mirror and front aperture.
A 300mm F/8 Corrected Dall Kirkham
Powerpoint presentation presenting the details and status of my CDK project, d.d. 28/Apr/2018.
Een Planetenkijker
Powerpoint presentatie met overwegingen voor een planetenkijker gebaseerd op een 200mm F/7 parabolische spiegel.
Cell-induced deformation
Analysis of the effect of the torque issued by flotation cell elements that are glued to the mirror. In moste cases other than 3-point cells this leads to unacceptable deformation.