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Messages - AIAS

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1
Yes, I remember when that firmware was released for the 1.4

in this post by foobar https://forum.krontech.ca/index.php?topic=464.msg3047#msg3047, I think that firmware was used on Chronos 2.1. off course and as you said, it is not supported anymore due to instability.


Thank you, it is a very informative repleys

2
Thank you very much for the clarification. it is an unfortunate that it cannot go below 832px due to hardware limitations, but still the Chronos 2.1-HD is a very good and affordable high speed camera and it seems that it was meant to be for media production industry and the Chronos 1.4 for both.

I wish it took all the advantages of its LUX2100 capabilities, but off course the price would go higher.

3
Hello everyone

I had the Chronos 1.4 for nearly 3 years and a lot of improvement were done in these years in terms of software updates. well done.

I have the need to go for higher fps and Chronos 2.1-HD would theoretically satisfy my need. for example, at 336 x 240, the Chronos 1.4 would give 15,968 fps (form Data sheet). the Chronos 2.1-HD theoretically would give nearly 26,000 fps. mklinger posted a very handy resolution vs fps chart, you can view it here: https://forum.krontech.ca/index.php?topic=629.msg4103#msg4103

you can see that we only have 4 options for the horizontal length (1920, 1472, 1152, 832). Is it a limitation from the new sensor or could be improved/already solved with new software updates?

BTW, mklinger is a very old post, and the specifications of the Chronos 2.1-HD in the official store shows different horizontal length options (1920, 1440, 1280, 1024, 800, 640) but still doesn't show the capability of going down to 336 for example.


Please advise. Thank you,

4
General high-speed discussion / Re: Speed Calculations
« on: July 25, 2019, 02:07:01 AM »
For the calculation of the speed accurately. First, take two successive images from your video. you can use "free video to jpg converter" to extract every frame.
The Chronos can already safe individual frames, no need for external  tools here. However a firmware upgrade might be required to do this.

Yes. Also as a TIFF Format, but I found it less quality than h.254

5
Many thanks to you all. It worked  ;D

I make sure there is continuity between the braided shield and the central conductor by measuring the resistance (4.2 kohm). Then I change the setting to 1mA pullups only.

Well done


6
One wire should be on the center conductor and the other on the outside braided shield. On your image they are both on the center conductor.

I attached one to the braided shield but still not able to successfully trigger it. BTW, I'll make a 10m long trigger once I know how to make it.

7
I tried it here very quickly

I connect the green and yellow wires together instead of a switch for now

still, I couldn't make work.


8
Hello everyone

I don't really know how this work, but I found in the following post that they just bring a BNC cable and switch button and it worked.

Reply #3: http://forum.krontech.ca/index.php?topic=475.0
http://forum.krontech.ca/index.php?topic=77.msg574#msg574
http://forum.krontech.ca/index.php?topic=56.msg697#msg697


I think there is smth missed but don't laugh, I bought BNC cable, BNC connector, two small wires and attached to one end of the BNC cable and connect them together as a normally open push button. I was 100% sure it won't work because there is no way that any signal will be generated... off course it didn't work  ;D ;D ;D


could instruct me on how to make it.

Thank you!

9
General high-speed discussion / Re: Speed Calculations
« on: July 23, 2019, 09:37:17 AM »
For the calculation of the speed accurately. First, take two successive images from your video. you can use "free video to jpg converter" to extract every frame. Second, download imageJ software and open the two images. you supposed to know the time interval between them. Then use the scale feature and draw a line for a known distance in the image. this stage determines how accurate your measurement is. it will give you how many pixels per inch/mm depends on your known distance. Finally, find the delta x and delta y of the moving object in pixels (you can easily get the pixel position by hovering the mouse in the image).

For example:
delta t between the two images is 0.001 second
delta x is 114 pixels
delta y is 0 >> object is moving horizontally.
scale: 228 pixels/mm

to find the distance: delta x / scale = 114/228 = 2 mm in 0.001 second
the speed then is distance/delta t = 2/0.001 = 2,000 mm/s    or    2 m/s



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