19/03/2018 by EAC Directory 0 Comments
100 billion fps high speed camera tracks light bouncing off a mirror
For majority of people, high speed cameras are ones that can capture footage from 120 to 240 frames per second or even from 1000 to 250,000 frames per second. These camera's do remarkable things and can slow down a bullet in motion giving one a chance to view how a bullet travels, or how glass shatters among other cool things.
High speed cameras don't come cheap though, so unless you have a huge chunk of money to spend you might as well just stick to those cool YouTube video shot at high frame rates to get a feel of how the cameras work and what they are capable of.
There has been advancements in the high speed camera to a point that one has been used to actually slow down a beam of light to a speed that one can actually see it bouncing off a mirror. As we all know, light travels at roughly a speed of 300,000 Km/s meaning that whatever needs to be used to capture it in slow motion also needs to have a super high frame rate.
Using a technique called "compressed ultrafast photography" (CUP), researchers at Washington University in St. Louis can track light as it travels and interacts with objects.
With this new technique, they are able to capture a laser beam bouncing off a mirror at an impressive 100 billion frames per second, see the below video.
So far, researchers have used the technique to explore a number of phenomena, including how light reflects and refracts, as well as how photons behave when transitioning from one medium to another. It is claimed that the CUP technique could be used in the development of so-called invisibility cloaks that work by bending light around an object.