Apparatus for determining the liquid level in a container comprises an optical imaging system with a variable light path length or focal length

摘要

Apparatus for determining the liquid level in a container having chambers, comprising a device for generating a parallel light beam at right angles to a chamber surface, an optical imaging system for producing an image of the reflected light beam, a device for recording the image, and a device for varying the path length of the light beam and/or the focal length of the imaging system, is new.