2006-11-28 16:49:10 · 2 answers · asked by Carlyne S 1 in Science & Mathematics ➔ Other - Science
An electronic eye is a sensor. It's what opens the door when you walk into the grocery store. Basically, it shoots out a beam of light and when you break the beam of light it triggers a switch which opens the door.
2006-11-28 16:53:23 · answer #1 · answered by somewherein72 4 · 0⤊ 0⤋
Loosely speaking an electric eye is a device that can recognize light or the absence of light, and initiate a response.They can respond to various frequencies of light, such as infra red and ultra violet.
Various chemicals, such as selenium are used as the sensing element. Some change resistance due to light. Others generate a voltage in the presence of light. Motion sensors can use these principles.Interruption of a light beam can sense the presence of an intruder. The other day in the hospital, a sensor was used in a fingertip device to measure the oxygen in my blood. Interruption of a light beam across an elevator door prevents the door from closing if a person is blocking the beam
2006-11-29 11:29:46 · answer #2 · answered by Ed 6 · 0⤊ 0⤋