external sync of ccd camera

[viswa]

Hello all,

                     I am using Pulnix PE2013P CCIR PAL standard analog monochrome camera for my experiments. I want to use the camera in external sync mode. I can do that by change over switch changing manually frominternal sync position using spec sheet instructions. 

My question is

Does it possible to see an image from the camera with out supplying sync pulses??? I have changed camera from internal sync to external sync mode i still see an image. I dont understand the reason. 

The spec sheet is given here

http://www.crijolanta.com.pl/produkty/pulnix/pe2020.pdf

My target is generating TTL pulses using DAQ card and supplying to CCD camera. I can now generate pulses but stuck with the above problem.

Any help is greatly appreciated.

[AnalogKid2DigitalMan]

viswa:

The link you posted is not valid (http:///)

-AK2DM

[viswa]

http://www.crijolanta.com.pl/produkty/pulnix/pe2020.pdf

Message Edited by viswa on 01-07-2010 10:25 AM

http://www.rapitron.it/archivi/oldindustrbwE.htm

ONE OF THESE LINKS SHOULD WORK.

Message Edited by viswa on 01-07-2010 10:27 AM

[david.bolt]

Dear Viswa

In camera files, there are two types of camera control lines, 4 internal and 4 external.  Lines 0-3 are external while Lines 4-7 are internal.  The internal and external pulse generation lines are by definition in sync. All defined pulses start at the same time and cannot repeat until the longest pulse has finished. It's common to define a pulse to trigger the camera on control lines 0-3 and use a dummy pulse generation on one of the lines that's not exposed to control it's repetition rate. If you're looking to trigger the camera from an external source (each line), then you need to configure the appropriate pulse for the camera and in your application define which trigger input will trigger each line. You only need to define the dummy pulse if you want the board to generate periodic triggers without an external input.

In the following diagram, the camera requires a 1 µs pulse for every line, and the frequency of the pulses determines the line rate. Control line 4 has the longest period, so no additional Pulse Generation Actions can repeat until control line 4 has completed its pulse. Control line 0 has an initial state of low for 1 timebase and then high for 1 µs. The initial state of control line 4 has been set to high, and it must have a duration equal to the line period desired for the camera.

You will be needing to work with a NI Camera File Generator to accomplish this:

https://www.ni.com/en/support/documentation/supplemental/19/creating-a-camera-file-using-the-ni-came...

Do you have a framegrabber card? Unfortunately, only the PCI-1426, PCIe-1429, and the PCIe-1430 support this feature.  If your camera had a separate line, you could try sending the TTL signal directly to the camera. 

Message Edited by david.bolt on 01-08-2010 08:46 AM

[viswa]

Hi David,

                Thanks for your reply.  i do have frame grabber PCI1411 card but we are not using the framegrabber to generate pulses to trigger each frame. I have to generate a sine wave for a laser in synchronisation with HD/VD sync pulses for camera, so that at the beginning of each frame we want to chnage laser wavelength.

I thought generating waveforms and pulses from DAQ card could make sure of everything in synchronisation. But i still see my camera generates image or frames with out supplying H-sync and V Sync pulses.

Then what is the use of giving external sync pulses when already camera is generating an image in external sync mode with out H and V sync supply?? 

Message Edited by viswa on 01-11-2010 11:44 AM

[david.bolt]

Dear viswa

Many thanks for your reply. In External HSYNC/VSYNC Mode, you must supply HSYNC, VSYNC, and at least one channel of video data. The IMAQ device locks to the timing provided on both the HSYNC and the VSYNC lines. The device then internally generates its own pixel clock and uses it to sample the selected video signal.

Have you configured the camera in MAX? (Measurement and Automation Explorer)

A) Launch Measurement & Automation Explorer (MAX).

1. Expand the Devices and Interfaces branch of the tree view.
2. Expand the IMAQ PCI/PXI-1411 branch of the tree view.
3. Right-click Channel 0.
4. Select Camera>>Select your camera
5. Click Save.

B) Click Snap or Grab to acquire images.

This will configure your hardware and software to acquire images with your camera externally.

A useful link for using the acquistion modes of Cameras can be found below:

https://www.ni.com/en/shop/choosing-the-right-hardware-for-your-vision-applications/image-acquisitio...

Please let me know how you get on. I look forward to hearing from you.