Counting number of condensed droplets on mirror or glass

Using Arduino Sensors
#1

I am looking for any solution which can help me out to count the number of droplets or amount of water on a mirror or glass.

I am going to spray mist on two glass or two separate mirrors. and I am looking for solution so I can compare the amount of water deposited on each glass/mirror OR I can count the number of water droplets on each mirror/glass and can display it.

Can I use any light sensor for this. if yes How?

#2

Repost of Best sensor for number small water droplets count

#3

No, not ANY light sensor. You must determine a light wavelength that is absorbed by water, but not by glass.
Once you know that and can produce that particular light, then a sensitive sensor to that wavelength can sense the difference in the light transmission before spraying with water and after spraying with water.
Rest is up to you.
Paul

#4

Veeeery difficult ... car automatic windscreen wipers make use of the effect the droplets have on light reflected off the back of the glass . Might be worth a google .

Might help to say what your project is trying to do ; there maybe an easier solution

#5

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