成年轻人电影直接看

成年轻人电影直接看

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... https://www.amazon.com/gp/product/B071ZQL9YZ/ 



Idea to use macro tubes for telecentric conversion of normal lenses came from here: http://www.4photos.de/camera-diy/Telecentric-Lens.html 


Commercial hypercentric and telecentric lens maker: https://lw4u.com/ 

Paper on making telecentric lenses with fresnel front elements: https://sci-hub.tw/10.1117/12.455256 

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: https://circuitcellar.com/wp-content/uploads/2012/06/CC2011110601.pdf

Staticmaster refill: https://www.amazon.com/Static-Master-4331991414-Static-Master-Refill/dp/B0000ALKDH/

Ionization chamber: https://www.aliexpress.com/item/32838644316.html

Carl Willis' video on spark gap detectors. (check out his whole channel) https://www.youtube.com/watch?v=-8GlzUjYazs

Polonium poisoning: https://en.wikipedia.org/wiki/Poisoning_of_Alexander_Litvinenko
https://sci-hub.tw/10.1088/1361-6498/aa58a7

Mightyohm geiger counter: https://mightyohm.com/blog/products/geiger-counter/

Applied Science on Patreon: https://www.patreon.com/AppliedScience

Saturday, February 22, 2020

Electron microscope animation: Carbon nanotubes pulled into thread




First-ever animation of carbon nanotubes self-aligning into a thread, captured by an electron microscope (as far as I know).Electron microscope animation of phonograph needle: https://www.youtube.com/watch?v=GuCdsyCWmt8Toothbrush:https://www.youtube.com/watch?v=cwN983PnJoAActive integrated circuit in homebuilt electron microscope: https://www.youtube.com/watch?v=eoRVEw5gL8cElectron microscope image capture system: https://www.youtube.com/watch?v=ruuxn2u3yaohttps://www.patreon.com/AppliedScience