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Laser Level
A level that uses a laser beam instead of manual reading. The laser beam emitted by the laser is directed into the telescope tube, causing it to emit a horizontal laser beam along the collimation axis.
Utilizing the monochromaticity and coherence of the laser, a glass or metal plate with a specific shading pattern, known as a zone plate, can be assembled in front of the telescope objective lens to produce diffraction interference. After focusing the telescope, within the focusing range of the zone plate, a bright and fine cross-shaped or circular laser spot is obtained, allowing for more accurate targeting of the object. If photoelectric receiving targets with automatic tracking are equipped on the front and rear leveling staffs, leveling measurement can be carried out. In construction surveying and large component assembly, laser levels are commonly used to establish horizontal planes or lines.
It is currently the most advanced level, which, when paired with specialized barcode leveling staffs, automatically obtains barcode readings from the staff through a built-in digital imaging system, eliminating the need for manual reading. This instrument can greatly reduce the labor intensity of surveying operations, avoid subjective human reading errors, and improve measurement accuracy and efficiency.
Electronic Level
Electronic levels, also known as digital levels, are developed based on automatic compensating levels. They use barcode staffs, and the barcode patterns encoded by different manufacturers are not interchangeable. Before 2013, sighting the staff and focusing still required visual adjustment. After manual sighting and focusing, the staff barcode is imaged on the telescope reticle for visual observation, and simultaneously, through the telescope's beam splitter, the barcode is imaged on a photoelectric sensor (also known as a detector), i.e., a linear CCD array, for electronic reading. Therefore, if traditional leveling staffs are used, an electronic level can be used like an ordinary automatic compensating level. However, the measurement accuracy in this case is lower than that of electronic measurement. Especially for precision electronic levels, due to the absence of an optical micrometer, when used as ordinary automatic compensating levels, their accuracy is even lower.
Currently, electronic levels employ three automatic electronic reading methods that differ significantly in principle:
1) Correlation method (Leica NA3002/3003)
2) Geometric method (Zeiss DiNi10/20)
3) Phase method
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
