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?