I want to create a switch in a circuit which will be operated by a beam of laser light being interupted. (I am making a speed detector using two lasers, 2 meters apart). What is the electronic componant I need to buy which will act as a light-sensitive switch but using red laser light and not sunlight?
2006-09-21 05:17:24 · 5 answers · asked by Paul D 3 in Science & Mathematics ➔ Engineering
Use a photo transistor. Laser light is still just light, just in a narrow band in the spectrum rather than broad white light.
I found a site that shows how you can in fact use such a sensor to detect how strong the laser is:
2006-09-21 05:33:37 · answer #1 · answered by Jonathan W 2 · 0⤊ 0⤋
Yup. Photo transistor or photo diode. Look in the optoelectronics section of the Digi-Key catalogue
http://www.digikey.com/
Doug
2006-09-21 12:24:30 · answer #2 · answered by doug_donaghue 7 · 0⤊ 0⤋
photoswitch is a kind of sensor that detects the presence of light, generally in a certain wavelength. Photoswitches are used for numerous scientific and manufacturing applications.
2006-09-21 12:45:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
photo cell, photo transistor etc
2006-09-21 12:24:51 · answer #4 · answered by Jack Kerouac 6 · 0⤊ 0⤋
photo transitor.
2006-09-21 12:19:17 · answer #5 · answered by Grant d 4 · 0⤊ 0⤋