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Sensitivity Training: Considerations for Measuring Very Low Pressures

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William K.
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Platinum
Re: Sensing those spray patterns: Not touch
William K.   1/4/2014 4:08:51 PM
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Jae Son, I had not considered the case where the goal was to measure the kinetic energy of the spray particle impacts. That must have been a very interesting project indeed. Quite different from investigating fuel injector performance.

I am aware that high pressure sprays do behave differently, but I have not read much about the details of that difference. 

Jae Son
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Blogger
Re: Sensing those spray patterns: Not touch
Jae Son   1/4/2014 1:12:54 PM
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William, 

Yes, you are correct that using laser light with a camera is a good way to charaterize spray patterns as the particles fly through the air, but our customers who have tried this approach wasn't satisfied due to thier needs to actually quantify the impact pressures on the surface for higher pressure sprays to seeing how the fluid accumulates and drips on the surface both of which the laser system could not quantify. 

William K.
User Rank
Platinum
Sensing those spray patterns: Not touch
William K.   12/31/2013 4:59:09 PM
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Sensing spray patterns is indeed an application that would need a great deal of sensitivity if it were done with a touch sensor. But a touch sensor is a poor choice for that taskby many standards. The very best way to evaluate spay patterns is with a camera and laser light. Timed flashes can allow plotting the velocity of each particle as to both speed and direction. So why waste time attempting to use the wrong technology for the job? Just like hoping to drive screws with a hammer, the results will seldom be accept6able and the efort will always to much work.

notarboca
User Rank
Gold
Capacitive Sensing
notarboca   12/30/2013 2:33:00 PM
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The capacitive sensor would seem to be the ideal way to measure droplet densities and spray coverage.

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