Non-contact liquid level measuring system

The invention relates to the technical field of sensors and measurement, in particular to a non-contact liquid level measuring system which comprises a probe arranged on the upper side of a liquid storage tank. The probe outputs collected analog video information to a processing module. The processing module comprises an image collection card, an industrial personal computer or a computer. The image collection card converts the analog video information into digital image information. The industrial personal computer or the computer processes the digital image information to extract a liquid level boundary function to obtain liquid level height according to the function. In the whole liquid level, the liquid level boundary is smallest in change, and the boundary liquid level distribution is simulated through an equation by collecting the liquid level image information. When the position of the probe is fixed, the liquid level height can be obtained directly through the liquid level boundary function. Even if t