Patent ID: 6819437
Filing Date: 2004-11-16
Classification: G01F,G01N,G01S

Abstract:
A liquid handling apparatus for detecting at least one of liquid level, object, and identify of an object, the apparatus comprising:an installation for lighting an approximately punctiform illumination point in a room and including a system for imaging light of a punctiform light source on the illumination point at a distance from the imaging system; an approximately punctiform light-receiving device having a photodetector for providing a measuring signal dependent on intensity of a received light; the imaging system imaging the illumination point onto the approximately punctiform light-receiving device; and an evaluation device for detecting approaching of an interface between two media of different refractive indices to the illumination point by evaluating the measurement signal provided by the photodetector, wherein a light beam lighting the illumination point has an aperture angle of at most 8Â°.