Importance

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Abstract

The laser beam levelling device has a vessel (1) with a U-shaped cross section filled with a dark liquid. A respective photoelectric sensor (2) is located on the exterior of the two free arms of the U. The two sensors (2) are connected to an evaluating device (3). As a respective light source (4) is provided opposite the sensors (2), a clear bright/dark distinction emerges in the region of the liquid surface level. This transition from the dark part into the bright part therefore indicates exactly the height of the liquid level. By comparing the height of the liquid level in the two arms of the U, the inclination of the axis X-X can be calculated in the evaluating device (3), or it can be determined whether the vessel (1) is located in the horizontal. The respective inclination can therefore be defined with high precision. The laser beam levelling device can accordingly be erected on a site on any uneven ground. The laser plane is brought immediately into the horizontal or directly into the inclination set on a keypad.

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First Claim