View Full Version : How Do IR Rangefinders work?

12-18-2005, 10:29 PM

I have a doubt about the operating principle behind IR rangefinders. They use an IR transmitter and a position sensitve IR receiver kept close to each other . By geometry position on which the IR light hits the receiver depends on the distance to the obstacle, but wont it also depend on the orientation of the obstacle relative to the sensor? Doesnt turning the obstacle just a little cause a large deviation in the position at which the IR is received?


12-19-2005, 12:12 PM
yeah it does,
it does depends on the angle of the object in front.
in addition it depends on the reflectivity of the surface too....
tats why it works gr8 for metal or aluminum[smooth /silvered} surface than a blurred surface.
it also depends on the color.. u ll have a hard time if the object infront is black in color. u ll loose on the distance at which u can sense the object.

12-21-2005, 09:58 AM
go through "triangulation used in rangefinding" on google or some search site..

you will get the point