Audience scanning (sometimes called "crowd scanning") occurs when a laser beam is directed toward the people observing a laser show or display. Although this is preferred for many laser effects such as tunnels, it is potentially dangerous due to the high levels of laser radiation exposed to the eyes of audience members.
Laser effects involving audience scanning are created by scanning the beam very rapidly across the audience, ensuring that the net exposure to any one eye is very small. Should the scanning mechanism fail, however, it is possible to expose people to laser light at levels that may produce eye injury.
Read more about Audience Scanning: Legality and Regulation, Relatively Few Laser Injury Reports, Audience Scanning Calculations, ILDA Audience Scanning Guidelines
Famous quotes containing the word audience:
“Of the modes of persuasion furnished by the spoken word there are three kinds. The first kind depends on the personal character of the speaker; the second on putting the audience into a certain frame of mind; the third on the proof, provided by the words of the speech itself.”
—Aristotle (384–323 B.C.)