Whitepapers

Trimble SX12 Laser Pointer White Paper 3 Background The Trimble SX12 EDM is optimized for high precision and speed, the same qualities that enable the SX12 to be a true high-speed scanner. For many other total stations on the market, the EDM doubles as the laser pointer, however this is not possible for the Trimble SX12 given that the EDM operates at 1550 nm wavelength. 1550nm is in the infrared spectrum and invisible to the human eye, so is not suitable as a laser pointer. Instead, the Trimble SX12 EDM and laser pointer are two separate laser sources. The Trimble SX12 laser pointer is coaxial with the EDM, however, as with all alignments of different sensors, there are collimation errors that need to be compensated for. The laser pointer's small size, color, and power all contribute to its exceptional visibility. The small laser spot is achieved using focusing lenses. The color is green, which is more visible to the average human eye than red. The power, though always Laser Class 1, can be set to three different modes to suit the environment and maximize visibility. Autofocus Implementation As with the telecamera, the laser pointer is focused based on the distance being received from the EDM. EDM Distances are being continually measured to ensure the laser spot is continually being focused for the distance you are working at. The laser pointer spot diameter is 3mm from 1.3m to 50m range, then an additional 3mm for every 50m beyond.

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