Field Evaluation of the U.S. Army Engineer Topographic Laboratories' Laser Dam Alignment Instrument.
Final rept. 1971-1972,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Several series of laser instrument alignment surveys were made at the exterior road-way deck level and within the interior inspection gallery of Keystone Dam, Oklahoma, and compared with theodolite surveys over the same lines and under similar conditions. Results indicate optimum laser instrument precision is obtained in protected environs such as galleries, tunnels, and conduits the practical range of the laser instrument is limited when exposed to atmospheric turbulence and the accuracies of the laser and theodolite systems are essentially equal under similar conditions. Improvements in centering and plumbing the laser receiver and a technique for measuring and compensating for laser beam drift are needed. A vertical angle adjustment capability is desirable. A laser instrument survey can be made in about one-half the time required for a theodolite system. Author
- Civil Engineering