Measurement of time delay between the out puts of two opto sensors. 1

[aabdallah]

Hello.
I'm looking for some help in determining the type of circuit I shoould use in measuring the time delay between the output of two opto sensors at differant times. I'm thinking of using a laching circuit. The output of the first opto sensor would be connected to the clk of a flip flop and the output of that flip flop would be connected to the clk of another flip flop. Now I can't think of what to do next. Please help.

 

[melone]

How about having one signal start a counter, and the other signal stop the counter....

 

[sdmays]

How much time do you expect to elapse between the two events (one opto sensor gives an output, THEN the other sensor gives an output)?

 

[aabdallah]

Thank you melon, I think I could take it from here. I greatly appreciate your help.

 

[peebee]

That's why melone makes the big bucks.

 

[lcsjk]

Very astute observation peebee!
The guy is good!

 

[automatic2]

or, rather than counting a clock, charge a cap, then read accumulated charge.

 

[47gandalf]

All of these techniques are pretty dependent on knowing what kind of delay we're measuring. Is that picoseconds or kilocenturies?

And of course what kind of accuracy is required.