| Post 1 made on Wednesday September 29, 1999 at 10:24 |
Roland S Historic Forum Post |
|
|
Is there any difference between the terms "infrared" and "passive infrared"? Or can they be interchangeable?
Some products list their items as Passive InfraRed.
Roland
|
|
| OP | Post 2 made on Wednesday September 29, 1999 at 12:10 |
David B Historic Forum Post |
|
|
Passive simply means that the unit does not emit IR light, but does detect it. All warm things emit some degree of IR. a PIR motion detector senses the difference between a warm body and the cold background.
Active IR emits IR light to illuminate an area to be "seen" with it's CCD that is sensitive to IR. Most new Sony camcorders use active IR for "night vision".
IR alone, with no modifier, simply refers to the spectrum of light known as Infra Red, which is slightly above human's vision range.
Dave
|
|
Please read the following: Unsolicited commercial advertisements are absolutely not permitted on this forum. Other private buy & sell messages should be posted to our
Marketplace. For information on how to advertise your service or product
click here. Remote Central reserves the right to remove or modify any post that is deemed inappropriate.
