I am measuring intensity.Are you measuring intensity or using triangulation?
Have you seen the Sharp GP2D12 group of sensors?
John
Their response is slower than Sharp's sensors!I suspect when you are measuring intensity, for best accuracy, you want a collimated beam. For the detector, I suspect a narrow aperture, slit, or some other way to limit extraneous light would be best (analogous to eliminating "stray light" in absorption spectroscopy). I have no experience in using intensity for distance determination.
Vishay makes analog detectors. In case you haven't seen them, here is a link:
http://www.vishay.com/company/press/releases/2010/100628irsensors/
John
Where do you see that 300us?300 µS (3.3 KHz) is slow? I don't think you are going to do much better than that with commercial IR, unless you go with straight carrier wave.
John
I won't measure the travel time but the intensity.What resolution do you need to be able to resolve? (+/- 1cm, +/- 2cm, other)
Since light travels approximately 30cm in 1 nanosecond. 1cm resolution would involve time measurements on the order of 32 femtoseconds (10e-15).
That is quite a stretch for most circuitry.
hgmjr
I get it. Time-of-flight is off the table.I won't measure the travel time but the intensity.