measuring time intervals
measuring time intervals
(OP)
I want to make a time-counter, which measures times between two events (event is just an interrupting of a light beam). I’ve been thinking to use double source of light and the appropriate detectors, once for initiating measuring and the other one for stopping. I thought the easiest way was to use laser diode within the visual spectrum (for more precisely pointing its light to the detector). Detector would have a response time of approx. 500-700 microseconds, AND output within the TTL limits, so that it just could be connected directly to a microcontroller.
If this was possible at all, I’d like to know which parts to use, how to drive laser diode and detector. Did someone do that before?
Thanks,
Ivan
If this was possible at all, I’d like to know which parts to use, how to drive laser diode and detector. Did someone do that before?
Thanks,
Ivan





RE: measuring time intervals
If this is a one-off, I'd pick up a cheapy Radio Shack laser pointer for a couple of bucks... those things last for a few hours easily between battery changes. All except the slowest of sensors (like maybe CdS cells) is going to be fast enough for 0.5ms response time... most fiber optic IR detectors work in the multi-kHz range without even thinking twice.
Google will come back with all kinds of light detector circuits...
Dan
Owner
http://www.Hi-TecDesigns.com
RE: measuring time intervals
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RE: measuring time intervals
RE: measuring time intervals
What is the best photo interrupt switch manufacturer / model you can suggest?
Unfortunately, googling for "photo interrupt switch" returns only one hit.
You're right I have not enough knowledge; I'm rather a (uProc) programmer without much practical knowledge concerning the rest of the hardware.
Thank you all,
Ivan
RE: measuring time intervals
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