How to shoot hot air? Who is proficient in optics?

Edge photography is an invention of17th century. Based on aerodynamics, it records the microscopic world invisible to the naked eye through special means. American scientists have found that this ancient technology can develop many new uses, such as preventing infectious diseases and airport security.

Fluctuating air or liquid will produce different refractive indexes due to the change of density in different areas. Edge photography takes advantage of this phenomenon, capturing the fluid fluctuations invisible to the naked eye with the help of strong light irradiation and complex optical equipment, and forming these amazing and beautiful scenes. Since their birth, many artists and photographers have been obsessed with the vagaries of light and shadow. However, in the eyes of scientists, fringe photography, like a microscope, can be used to uncover the secrets of the microscopic world. Gary Secht is a professor of aerodynamics at Pennsylvania State University. He has been dealing with stripe photography for 25 years. According to his research, stripe photography can be used to study the spread of germs in the air and find explosives in time during airport security inspection. This is the safe passage he designed. Every passenger's hot air trajectory will be recorded and captured when he passes by. This gas contains tiny particles of anything that passengers have touched. By analyzing its composition, it can be judged whether the passenger has been exposed to explosives. This kind of security gate has been widely used in American airports at present.

Ordinary cameras are difficult to handle. .