CM3-U3-13Y3M-CS Photon Integration Cycle

Answered

Timothy Stamm

• December 31, 2023 19:31

Hi,

How does the CM3-U3-13Y3M-CS GPIO output correspond to the camera exposure cycle when using PointGrey? 

Trying to determine where in the GPIO output cycle waveform images are saved/timestamped to align with GPIO input sync or trigger signal in multiple scenarios. 

One scenario is running camera at 30fps with input sync signal and output strobe. Yellow signal on o-scope is GPIO output strobe waveform.  Green signal is input synchronization waveform.

 

Another scenario is triggering the camera using 30 fps GPIO input, and GPIO output strobe. Green is input trigger, Yellow is output strobe.

Camera set to trigger on high-low:

Camera set to trigger on low-high:

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• Official comment

  

  TDY_Demos

  Community team

  • February 09, 2024 22:42
  • Edited

  

  Hello Timothy,

  I am just following up to make sure you have what you need.  As Manuel mentioned, the GPIO output by default matches the integration time.  That is what the last 2 images grabs from you show.

  The first image seems to be the camera running in free running mode, and you also sending a trigger signal to the camera.  They are not synchronized, the camera would ignore the trigger signal.  The GPIO output matches the exposure time.

  You can verify this in both cases by adjusting exposure time and seeing the pulse width change.  Depending on your polarity, the exposure time is active low or active high.

  Thank you,

  Demos
• 

  TDY_Manuel

  Community team

  • January 03, 2024 14:05

  

  Hi Timothy,
  
  Unless you configure a strobe length, the pulse length represents the exposure time. The image timestamp always represents the end of exposure. 

   

  Best regards,

  Manuel 

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• 

  Timothy Stamm

  • February 03, 2024 01:10

  Thank you!

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