I need a detector to measure thickness of water layer. could some one recomment some type of detectors? using utrasonic or light?
Hello, it should be possible by measuring the resistivity of the water layer. This should correlate with the thickness of your sample. You only need 2 electrodes on your sample and some measuring device. Perhaps you can also use a quartz crystal. They change resonant frequency with the thickness of teir coating. But i dont know if this works for liquids. A third option works on conducting substrates. You can simple use a needle where you can adjust z position in µm range. When the needle touches the water courent flows that can be measured. The same principe like a tunneling microscope. You can also freeze the water and use a profilometer to measure thickness. This device has nm resulution.
Hello.
You can use optical interferometter method or try measure using cheap laser's beam deviation as a result of beam refraction..
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