extracting time from digital signal

[Chata]

 Hello,

If I have digital signal originating from optical barriers and want to extract time (for a body that passes these 2 barriers) how can I extract that time using Labview.

thx 

[Hillman]

Hi Chata,

Thanks for the post!

I was wondering if you could post an image of this signal. What aspect of the signal tells you that it has passed through these barriers?

Are you trying to find out the time between the 2 barriers?.. some more detail would help greatly.

Kind Regards,

[Chata]

Actually I don't have this signal yet (my friend works on that aspect) I just want to find out the time between the 2 barriers?

[Hillman]

Hi.

So would this signal have peaks?

What do you mean by barriers?

Kind Regards,

[Chata]

hey,

I'll get back to this when I see the signal. 

[Chata]

Let's say I have these two analog signal obtained from each optical barrier. What I want is to fin the time between maximum points of diagram. Does someone have some guiding points on this?

[Hillman · Accepted solution]

I chata,

Thanks for the reply, and I hope your well.

Here is an example Ive done for a customer, who wanted to find out the time of a flat section of his waveform.

In your case, you would need to do a peak detection on both codes, and then minus the locations and do some x by sample number to get time.

Let me know what you think.

Kind Regards,

James.

ps sorry code is a bit rushed.

[Chata]

It is interesting. Waveform Peak Detection VI uses quadratic least squares fit. I menage to solve this using Statistics (time of maximum). Thanks for help.