Quote:
Originally Posted by redneck
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Nice... 
Maybe mount a small camera like a cheap backup or dash cam video camera to see or record what’s happening instead of trying to take pictures as the vehicle passes. If your think the camera or mounts might affect the air flow patterns then something else may be needed. In the movie industry when rolling action shots are needed, the cameras are often mounted to a “Jib” on another vehicle. A jib being a long supported pole. Several pieces of 1/2” EMT (electrical metal tubing) welded or bolted together in a triangular shape and mounted solidly to the front of a second vehicle with the camera mounted low should work nicely and would be easy to fabricate.
Again, just spitballing...
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I tried using a Go Pro video camera about 3 years ago to look at tufts on the undertray but the angle was so small that you couldn't see anything. I couldn't have the camera any lower or it was in danger of hitting the road.
I am thinking of using a miniature pitot tube (yet to be covered in this thread on measuring techniques) where airspeed should be able to be used to determine if flow is attached or separated.