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Yep, I've considered this - hence the need for 2 collimating lenses - one to spread the beam and another to refocus it. I'm not sure how effective this will be though. Since I'll be doing the measurements in the vicinity of the tire, the direction of the spray should not be an issue (I'm...

Thanks for the welcome ! I considered using a laser as it (will?) give me better control over pointing direction. I also suspect that the beam from a flashlight may be too dispersed by the water fog/spray. I want to use the light intensity measurement as an indirect measurement of the "density"...

Can somebody please point me in the right direction. I'd like to do an experiment to measure the spray that comes off car tires traveling in the rain. I thought about rigging up a small system consisting of a laser, collimating lenses and a light sensor to measure the intensity of the laser...