2006-11-30 05:41:19 · 6 answers · asked by sekhtet 3 in Science & Mathematics ➔ Engineering
It depends on the centre frequency and bandwidth of the IR detector. Glass will absorb certain IR frequencies, very often IR detectors use this as they do not wish to see beyond windows which would cause false alarms.
2006-11-30 06:09:17 · answer #1 · answered by Anonymous · 0⤊ 0⤋
they are not really motion sensers but they sense light. if the light goes through the glass then they can detect it. So say a shadow through a glass alters the light in a room the sensers will detect that also evan though nothing was in the room. to avoid this they alter the sensativity of the sensers. so large amounts of light are detected not just shadows.
hope this helps
-David-
2006-11-30 05:46:41 · answer #2 · answered by David M 2 · 0⤊ 0⤋
Depends. It could refract it. If the sensor is directly against the glass it should work.
2006-11-30 05:44:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Depends on how thick the glass is
2006-11-30 05:42:37 · answer #4 · answered by Captain Moe 5 · 0⤊ 0⤋
yes, and they also bounce off mirrors. It's pretty cool.
PS: actually, the post above has a good point. if it's too thick it wont work.
2006-11-30 05:43:04 · answer #5 · answered by pito16places 3 · 0⤊ 0⤋
yes it see`s thru everything but lead
2006-11-30 05:43:52 · answer #6 · answered by Anonymous · 0⤊ 1⤋