Messages

1

Chronos User Discussion / Re: Insanely high speed slit scan method?

« on: November 27, 2017, 08:22:45 PM »

PaulBryanTV,

The high-speed imaging industry uses high-speed streak cameras in the way you just described.  With the Chronos 1.4, you would run into a problem with the exposure needed to pull it off.  To get good detail to build an image from lines you would probably need 750ns exposures or faster.  Even if you ran the Chronos at the fastest exposure, you wouldn't have the light.  If you ran the camera at 1-million fps you would be forced to have a <1us exposure.

The picture I posted above was captured with a 500ns flash and a relatively inexpensive Nikon DSLR.  Projectile is exiting 6 inches of gel.  A flash unit like this could be utilized with a Chronos with full exposure at any given resolution (1/frame rate) or frame rate to capture a similar image.

2

Chronos User Discussion / Re: Insanely high speed slit scan method?

« on: November 27, 2017, 08:07:42 PM »

Hi David and others!
Just wondering after reading a lot of articles online about photo finishes, is it possible to make the Chronos read out a 1x720px image at even higher speeds for stuff such as high velocity weapons etc? So we could create high res 'frozen in time' style images from the footage using something like Slit Cam?

As the bullet or projectile would travel through the horizontal axis creating a full image of itself, so we only need the vertical resolution?
Would this make the camera be able to record insanely high speeds?
Is it even possible? Just an idea.

You mean like this?: (see attachment)

3

Chronos User Discussion / Re: Adapting other lenses to C-mount

« on: November 27, 2017, 07:45:09 PM »

Martin,

I'm not familiar with the Sony lenses but if you don't need any electronic controls, I think I can make you one.  Just hunt down a physical drawing of the mount for me and I'll tackle a prototype grade mount. I've already made a few Micro Four Thirds mounts - or at least dedicated speedbooster mounts.  The mount you are looking for is not much different on the distance.

Just reach out to me at Aimed Research and we'll work on something together in our spare time.

-Nathan

4

Chronos User Discussion / Re: Serial numbers.

« on: November 27, 2017, 07:25:59 PM »

You have 7.  I have 8.  Where's 9?

5

General high-speed discussion / Re: Measuring Speed

« on: November 27, 2017, 07:11:45 PM »

You might be looking for a quilter's ruler or cutting mat.  They are sold clear (for your own background) or white among other colors.

Honestly, if a TV show is using a grid (behind or outside the plane of travel) it is only for show.  If you are interested in accuracy, you use an image calibration in the plane of travel.  This means you have a second image file for your calibration grid in the plane of travel and reference it for your tests.  You update the calibration every time you move the camera or adjust the lens.  If you only have video editing software, then you make the calibration image transparent and overlay it to your test videos.  If you have decent motion analysis software, then you can have on-screen point tracking.

6

General high-speed discussion / Re: Triggers?

« on: November 27, 2017, 06:54:09 PM »

What I have been recommending is the Micnova light, sound, and motion trigger.  There are other brands that share the same trigger housing but the electronics are not the same.  Contact me through Aimed-Research.com and I can get you some links to the best outlets to purchase the trigger and the required items to go from 2.5m to BNC.

7

Software Dev / Re: raw video data

« on: August 31, 2017, 05:14:17 PM »

tretee must be going off the FAQ page which still says the orders will be shipped end of August.  Its obviously the end of August but most of us know that there is a two-ish week delay.

8

Software Dev / Re: Missing (weak) Green colours

« on: August 03, 2017, 09:20:10 PM »

I doubt the sensor is lacking in sensitivity for green.  I believe it is common for sensors to be most sensitive to red, green, then blue the least.  Its not drastic, maybe a few percent in terms of quantum efficiency (I didn't look into the response of the sensor, I am guessing from what I've seen on other HS cameras).  I would suspect the optical components starting with the IR filter down to the lens.  I recently was playing around with different IR/UV cut filters for the Fastec TS3.  The results of different IR/UV filters (behind the lens), is wild.  Remember, your lens is not designed to pass IR and UV.  It is designed to pass visible light. Those wavelengths will focus at different points.  If you focus on a subject using visible light and change to a UV light, the focus will be off.  The sensor doesn't know what wavelength excites each pixel.  Only after filtering and digital processing is the color interpreted.  My experience is that high-speed cameras do not have enough native color saturation.  With expensive high-speed cameras, even if you get the color balance right,  the color is never brilliant enough.

9

Chronos User Discussion / Re: Highspeed Video Capture Synchronized with an Analog Input

« on: August 03, 2017, 08:15:27 PM »

Ormia,  I think you could do this now with the current features.  If you have an external timing signal to control the frame rate, just share that signal with your DAQ on a separate channel.  Example: on your DAQ Chan-1 is your sound capture, Chan-2 is your camera timing pulse.  Use the waveform to aid in accurately merging audio and video.  Does that seem to fit your requirements?

10

Chronos User Discussion / Re: Triggering two cameras

« on: August 03, 2017, 07:49:56 PM »

For synchronization it would be best to have an external pulse to control both frame rate and exposure.  You would still want to share a trigger signal.  If you are just triggering both cameras at the same time - sharing a common trigger, you have no control over their clocks.

Think of the frame capture as the series of dashes in the lines below.  Periods just represent time between frames.  T= point in time trigger is received.  If the recording ends at the trigger, it could look like this:
Cam-1 |...|...|...T
Cam-2 ...|...|...|T
The same number of frames (dashes) were captured.  Just not "in-sync".  How close in time the frame captures could be is dependent on frame rate.  At 10,000fps two separate cameras sharing a common trigger would have frame captures within 0.0001 sec (1/10,000) from each other max.  At 1,000fps that time would be longer, 0.0010 sec (1/1000) max.  Obviously the faster your object's motion, the more critical the timing becomes.

When you utilize the Edge Triggered and Shutter Gating features, you are truly synchronizing the cameras, assuming cable lengths are the same to each camera.  Tesla500 would best be able to define the timing resolution in that scenario.

11

Software Dev / Re: Software update V0.2

« on: July 25, 2017, 12:46:56 PM »

New update trigger issue...  I have a report that the new update will allow a trigger delay only for the on-camera trigger but not the BNC trigger input.  Can anyone verify, I am not with my camera.

12

Chronos User Discussion / Re: List of good (and bad) SD cards

« on: July 07, 2017, 03:12:26 PM »

David,  Which Lexar cards do you recommend? The link you posted has various sizes.

13

Software Dev / Re: Suggestion: Reverse direction of buffer bar

« on: June 11, 2017, 08:14:01 PM »

I second the unnatural feel of the scroll bar.  I too would ideally like to see a left-right timeline.  This would allow better "resolution" of scroll bar distance to time making it slightly easier to find an event.

14

Software Dev / Re: Initial feedback

« on: June 11, 2017, 08:07:25 PM »

How hard would it be to have pinch-zoom and pan?

If possible, it would be ideal to have the side bar buttons hidden to make room for a larger view.  Fastec has a top corner of the screen that you touch to access the menus (aside from pressing the menu button).

There needs to be a way to accurately adjust exposure while viewing the image.  The scroll bar is too short for accurate control.  Maybe the jog wheel would be a good control.

When in the menus, the keypad/numerals are small.  Obviously when I type in a resolution, frame rate, or exposure, I do not need alpha characters.  The numerals should take up the screen for clumsy, fat fingers.  Something similar should be changed for naming the file.  Maybe separate the alpha from numerals with a shift function.

We need better trigger settings.  Trigger delay in frames only is not ideal, it needs to be tied to seconds.  Having a timeline trigger slider like Vision Research, Photron, and may others is standard.

15

Chronos User Discussion / Re: Mounting Holes

« on: May 26, 2017, 06:11:30 AM »

I would be more concerned about the muzzle blast/pressure damaging electronics than shrapnel (if the camera will be placed fairly close to the firearm.