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Actually let me refrase this question.Hope I posted this in the correct forum. Lets say I have a common vortex sensor from an average vehicle, one that uses ultrasound to measure vortex frequency, hooked directly to an oscilloscope.What variables influence the output? Obviously cross section...

The math involved in the Von Karman equations is beyond me.I have one simple question.Does air temp have a direct effect on the vortex frequency produced? I know the resulting vortex is based on factors such as the blunt body, cross section, and air velocity, but to what effect(if any) does air...

Yeah that's my "last resort" plan.

Curious if anyone had a transfer function for one of these sensors.Specifically the ones in late 80's Porsche 951, or even one similar.I can get the exact part number if needed.This will be of great help to me and I will be extremely appreciative if some one could post/send me it.Thanks in advance.

Check out the QProx sensors from Quantum Research Group.They are very cheap($2) touch sensor IC's, they work very well at sensing rain through glass. http://www.qprox.com/products/index.php

It is for flow testing, so yeah I need a fluid with properties similar to gasoline. Viscor(as posted by NeilDS) seems to be the most appropriate.Anyone know how deionized water and alchohol(or cutting oil) compares physically to gasoline?

From what I hear/read, a non-flammable fluid with similar physical properties as gasoline is used.I was assuming the question would be easily answered, I guess it must be a trade secret of some kind.Anyway, thanks for the reply

I'm in the process of building a fuel injector flow bench.My question is, what would a suitable test fluid be?