Aga Aktiebolag

Geotronics Ab

Holger Marcus

Lennart Nordstrom

Ragnar Scholdstrom

Karl Ragnar Scholdstrom

Nils Stahl

Apparatus is disclosed for measuring the distance to a point on the inner wall of a hot furnace.

Apparatus for measuring the distance to a point on the inner wall of a

A method of making a series of measurements of the relative position of a point on the surface of an object in an object related coordinate system is disclosed. The object is turnable around an axle. The point, which moves between each measurement, is measured by an optical distance and angle measuring device which is placed each time in an arbitrary position in an earth-related coordinate system. The measurements of the position of said point are transformed from an earth related coordinate system to the object related coordinate system. By comparing the current measurement of the point with past measurements of the point, the wear on the surface of the object can be determined.

Optical measuring method

A method of measuring changes in the location of a physically inaccessible point on a surface is disclosed in which the surface may be moved relative to the measuring point between successive measurements.

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Lidingo, Sweden

Holger Marcus