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In my spare time I like to make videos on technical subjects, which are published on the Huygens Optics Youtube Channel.

How to make Very Flat Optical Surfaces on Glass Dec 16, 2019   
The video shows (hands on) how a nanometer level flat optical surface can be made. It first discusses the principle of the continuous pitch polisher, also known as the planetary polisher or optical lap master.

Metal Detector Discrimination Explained (with a Garret AT Pro) Nov 12, 2019   
In this video I discuss the principle of a VLF- type induction balanced metal detector (Garrett AT pro), in particular how the discrimination between different metals works. I do this by looking at the emitted and received signals of a test coil, so not by opening up the detector.

Next Level Spirit Level (for billiard / pool table) Oct 14, 2019   
Leveling a billiard table to an exact horizontal orientation requires a very accurate "spirit level" device (also called "bubble level"). In this video I show the complete process, from requirements and design, to prototype manufacturing of the bubble level from 2 borosilicate glass disks.

Optical Lens Centering using a LOH LZ-80. Oct 8, 2019   
Unfortunately it turned out that -after my Loh LZ-80 centering machine was brought back to operational status- the lenses were already correctly centered. The cause for their poor performance was actually in the construction of the optical tube holding the triplet. So in the end, centering of the lenses turned out to be unnescessary.

Polishing a Small Spherical Mirror Surface on a Glass Blank Sep 17, 2019   
This video is a follow-up from the video on spherical radius grinding. In this video I explain briefly the grinding process (using sIlicon carbide, SiC) and polishing process (using Cerium oxide, CeO and optical pitch).

CNC Radius Milling in Optics: the LOH Spheromatic Curve Generator. May 30, 2019   
In this video I discuss spherical radius milling of both metal and glass. In addition the principle of the Loh Spheromatic CNC 120 radius grinder / mill is discussed. This machine can be used to mill / grind spherical surfaces on glass and ceramic objects.

DMD Mirrors in a DLP-Projector Moving in Slow Motion (Stroboscopic Effect). May 9, 2019   
This video shows how you can view in slow motion the very tiny digital micro mirrors that can be found in for example DLP-projectors (beamers). The method used here is based on a combination of microscopy and stroboscopy and does not require a high-speed camera. By using this method, we cannot only look at the pixels in real time but at the same time slow down the switching process (which is in the microsecond time range) by several orders of magnitude.

DIY Photolithography using 1980s Carl Zeiss S-Planar Lens (405nm). Apr 13, 2019   
In this video I demonstrate how I used a Carl Zeiss S-planar wafer stepper lens to do micron-size photolithography and used this pattern to etch a chromium layer.

   Hobby Projects         2022         2021         2020         2019