Schlieren imaging is a fairly standard optical technique for visualizing heat, sound, or pressure differences in air. Technically, a schlieren system is able to see clear disturbances in air due to slight differences in the speed of light in the air.
The technique can be sensitive enough to see the heat rising off a human […]. petapixel.com
The recording of the patterns made by static electricity date back to the invention of the technique in 1777 by Georg Lichtenberg. Since he was the first to observe the patterns they are referred to as Lichtenberg figures. [Read More]
Originally, the geometric chuck was a device to make ornate patterns on a lathe. Invented in the 1860s, the device could have up to 8 layers—each driven by a central shaft. There are several of these complex devices still in existence and on display in museums. Each layer can have a unique set of gears […]
A few years ago, I saw an article on water-damaged film that claimed the damage was due to bacteria and fungus eating the film. Having a bit of experience with fungus and bacteria from various scientific projects over the years, I thought I would explore this topic. Could I speed up the process? I also […]
I often hear my students lament about how if only they could travel to the rainforest they would find something really interesting to photograph. I tell students “look around where you live – there are wonderful things to photograph everywhere”.
Polarized light is light that has waves oscillating all in the same direction. There are two basic ways to get polarized light: from reflection or by using a filter. Amazing colors can be created in frozen ice crystals, which are seen here beginning to form as the water freezes. Under polarized light the ice appears […]
Many materials show internal stress when illuminated with polarized light and photographed with a second analyzing polarizer. This unique property of materials is called birefringence. Some of the more common material that exhibits this property is glass, ice, and most plastics.