Sunday, July 19, 2020

Holograms on chocolate

DIY process to copy commercial holograms onto chocolate! Completely edible -- no dyes or inks used. Tech Ingredients' video: Samy Kamkar's diffractive chocolate: Hologram stickers: Silver mirror process: Add a pinch of sodium lauryl sulfate to the stannous chloride primer solution to help the solution get into contact with the plastic surface. Morphotonix: Caswell nickel electroplating kit: (Price was already pretty high years ago, and has gone up a lot since; and the kit has fewer components than it used to. But it does work well.) Holography Marketplace book -- lots of very practical information for making your own holograms, and good source of suppliers (though many are out-of-business now): Very good source for mold making supplies: Countermeasures against hologram copying. Holograms are often used as a security seal, so making copies as shown in the video could be a problem without countermeasures: I was planning to talk more about different types of holograms in technical detail, but I think I will save it for a future, dedicated video on making original holograms.

Giant glass diffusion pump and cathode ray tube demo

This vacuum diffusion pump is made entirely of glass so we can see how it works. I also show a CRT built from a glass lab flask. The pump was bought on Amazon! Diffusion pump instructions translation: I used DC-704 silicone diffusion pump oil: The tabletop burner and fuel are commonly found at Asian supermarkets. Phosphor paint: Water chiller: Support Applied Science on Patreon:

Tuesday, April 28, 2020

Hypercentric optics: A camera lens that can see behind objects

Telecentric and hypercentric optics are very different from our eyes or normal camera lenses. They have "negative" perspective or no perspective, respectively, leading to very unusual images. In this video I show how to use a common fresnel lens in the creation of your own telecentric optical system. 
Fresnel lens, 300mm dia. 200mm FL is sold out... 

Idea to use macro tubes for telecentric conversion of normal lenses came from here: 

Commercial hypercentric and telecentric lens maker: 

Paper on making telecentric lenses with fresnel front elements: 

Sunday, April 5, 2020

Alpha radiation makes sparks, detects smoke, and eliminates static cling

Interesting applications of a strong polonium-210 alpha radiation source.  The half life is only 140 days, so the Staticmaster brushes must be replaced every year or so.

Great technical article on ionization smoke detectors:

Staticmaster refill:

Ionization chamber:

Carl Willis' video on spark gap detectors. (check out his whole channel)

Polonium poisoning:

Mightyohm geiger counter:

Applied Science on Patreon: