The field is a gas flow with some turbulence. I would like to have sufficient resolution and frame rate for say 10 to 50 frames/sec.
Hi Peter, many things to consider here. For starters, you'll need to consider spatial aliasing, so you'll need full HD minimum (1920x1280) to get at least 2 pixels spanning each fringe. However, fringe spacing may vary, so ideally you're looking at even higher resolution e.g. 4K. You then need to consider the temporal b/width of the flow you are trying to capture to avoid aliasing in that domain. Is 10-50fps sampling the flow fast enough to follow the turbulence? You then need to consider the interfacing format: at high resolution/frame rate you will need a good capture card with an SSD to avoid dropping frames. Black Magic do capture cards for SDI cameras that are reasonably priced. Another factor to consider is whether a rolling shutter is tolerable i.e. the exposure is not instantaneous across the whole field. I guess you need a monochrome, high sensitivity (at the wavelength of the laser), low noise camera, with good bit depth. Might be worth contacting Stemmer with these requirements to see what they have that fits the spec and your budget. I hope this helps. All the best, Steve
Hi Steve. Many thanks for the advice. I will check out black magic. I know well about rolling shutters, but will be able to pulse the laser.
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