Patent ID: 8661891

Claim:
An apparatus for measuring a liquid level of molten metal, comprising: an image measuring device, a measuring probe, a lifting mechanism, a displacement sensor, a data processing system, and a correction marker mounted either on the measuring probe or on the lifting mechanism, wherein: the lifting mechanism is mounted on a molten metal container, or is independent of the molten metal container; the image measuring device is mounted on the lifting mechanism or is independent of the lifting mechanism, and an optical axis of the image measuring device is set at an angle with a geometric axis of the measuring probe; the measuring probe is mounted on the lifting mechanism or is independent of the lifting mechanism, the measuring probe is located within a range or a field of view of the image measuring device; and the image measuring device, the lifting mechanism and the displacement sensor are connected to the data processing system respectively; wherein the correction marker is used for correcting a measurement error resulting from a change of a relative position between the image measuring device and the measuring probe.