We need to measure the height of different fluids (from clear water to oil, everything is possible).

The bottles may come in different sizes and may have an opening as small as 10mm. The bottle materials might be glass, plastic, metal, whatever...

The measurement must be non invasive. We only need to know when the bottle is (nearly) full (10-20mm below top).

A few questions:

  • Does a laser work in clear water (suggestion from the comment)?
  • Why won't ultrasonic sensing work?
  • Any other non invasive measurement techniques to measure distance of a liquid?
  • \$\begingroup\$ 10mm is pretty big. If you know which fluid you are measuring, you can weight it. \$\endgroup\$ – Eugene Sh. Oct 24 '19 at 17:31
  • \$\begingroup\$ total or subtotal reflection of a laser works with clear water, too.- \$\endgroup\$ – Marcus Müller Oct 24 '19 at 17:32
  • \$\begingroup\$ @EugeneSh. that will not work. We really need to know the level, as we do not now the bottles inner size. \$\endgroup\$ – Raphael Oct 24 '19 at 17:38
  • 2
    \$\begingroup\$ @Raphael - This is only slightly different than your previous question: "Sensor to detect internal volume of bottle" where you wanted to measure the volume of a bottle. Now you are saying that you want to measure the liquid height in a bottle, not the volume, even though the bottles could be any shape - meaning that knowing the height cannot tell you the volume. So are you sure that this variation on your previous question really should only ask about measuring height, and not the volume? \$\endgroup\$ – SamGibson Oct 24 '19 at 17:48
  • 2
    \$\begingroup\$ Possible duplicate of Sensor to detect internal volume of bottle \$\endgroup\$ – Solar Mike Oct 24 '19 at 18:11

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