- #1
nightsparkling
- 8
- 0
Hi everyone,
An auto-focus camera emits an infrared pulse and detects the pulse reflected from the target, then it calculates the distance of that target from the camera (i.e. it can focus the target). As far as I know, all objects will emit infrared radiation, so what is the use of the pulse emitted by the camera? Or if I put it differently, even if the camera emits an infrared pulse, but can it receive another pulse from the target ? or even receiving pulses from another object which is not the target?
An auto-focus camera emits an infrared pulse and detects the pulse reflected from the target, then it calculates the distance of that target from the camera (i.e. it can focus the target). As far as I know, all objects will emit infrared radiation, so what is the use of the pulse emitted by the camera? Or if I put it differently, even if the camera emits an infrared pulse, but can it receive another pulse from the target ? or even receiving pulses from another object which is not the target?