how to trigger a galvo mirror (AO) and a camera (in external trigger mode) simultaneously ?

[mnemo15]

Hi,

I have 1 galvo mirror and a camera that i want to trigger , that means that when the camera start to record a image with a certain exposure time, the galvo mirror is doing oscillation during this time (it is a line scan). The galvo mirror is controlled by  PCI-6733/SCB-68  via Analog Output and the Camera (from Andor) can be configurated  in a external trigger mode. Do you have any idea how i have to proceed?

thanks by advance

regards,

mnemo15

[Kevin_Price]

Assuming that you want to make one "trigger" pulse per cycle of the analog waveform, I would configure one of the board's counters to generate an output pulse train that is based on dividing down the AO sample clock.  You can use the "initial delay" parameter to help set the phase of the pulse relative to the analog waveform; thereafter, the "high time" and "low time" parameters need to sum up to the # of AO samples per waveform period.

Here's a little headstart to show you the counter stuff to add in:

-Kevin P

[mnemo15]

Hi,

the galvo mirrors receive a waveform signal (cosine) as shown in the snapshot. In fact it is when the galvo start oscillating on 2 cycles that I want to record with the camera. So I want to trig the camera with the galvo signal. How can i do it ?

thanks by advance

[Kevin_Price]

I'm pretty sure I don't fully understand what you need -- could you describe it again in more detail.

Meanwhile, I'd suggest that trying to trigger the camera off the analog galvo signal is probably not the best approach.  My first reply was a suggestion that you simply create your own separate digital trigger pulse in a way that syncs to the analog galvo signal you're generating.