Successful shooting in the world that the same Mach cone as when "Sonic Boom" occurred in the world

BySilver Blue

When an object flies at supersonic speed, shock waves are generated in front of and behind the object, respectively, and it is known that a roaring sound called "sonic boom" echoes. This shock wave has a conical shape and is called "Mach cone". Even when the light travels it is like a cone like a coneWakeflow (late flow)It has long been argued that whether it will be created, but now, the world's first "Mach-con of light" was filmed.

Single-shot real-time video recording of a photonic Machine induced by a scattered light pulse | Science Advances
http://advances.sciencemag.org/content/3/1/e1601814

Ultrafast Camera Captures 'Sonic Booms' of Light for First Time
http://www.livescience.com/57572-ultrafast-camera-captures-sonic-booms-of-light.html

Ultrafast cameras capture 'sonic booms' of light | Daily Mail Online
http://www.dailymail.co.uk/sciencetech/article-4142128/Ultrafast-cameras-capture-sonic-booms-light.html

The shock waves observed when fighter aircraft fly at supersonic speed, and what kind of sonic boom is, it is easy to understand by seeing the following movie.

Supersonic Flight, Sonic Booms - YouTube


Discussions have been made on the possibility that moving light creates a conical wakeflow similar to Mach corn, but the research team at Washington University is the world's first conical wake generated by light, so to speak I succeeded in photographing "Mach Ma cone".

Light travels in vacuum at about 300,000 km per second, but when passing through glass the speed drops to about 60%. A research team who focused on the phenomenon that the speed of light changes when passing through different substances conducted an experiment to fire and observe a green laser light pulse in a tubular space filled with water vapor of dry ice It was.

An ultra high speed camera that can shoot 100 billion frames per second is used for shooting. When shooting with this camera, I was able to shoot the following "Mach-con of light".


The success of the shooting is due to the high speed camera, and the research team says, "This high speed camera may be used for observing neurons moving in the brain."

By the way, a picture like "a conical cloud is generated behind the aircraft" is not a Mach CornVapor ConeI caught a cone of water vapor called. Depending on the environment, it may occur less than the speed of sound, and it may not occur even if it exceeds the speed of sound.

ByTodd Lappin