Fluid measurement

摘要

This invention relates to sensing in respect to fluids and utilizes an effect relating to a beam of light and a fluid boundary. It has been found that a beam of light will be modulated differently when submerged and unimmersed in a fluid and also that between these two limit positions critical levels of the beam with respect to the boundary exist in which light transmission is at a maxima and a minima. These maxima and minima can be put to use in liquid level detection and control.