Temperature Effects on Lasers

by Robert J. Devery, (M.ASCE), Pres.; Devery Engineering, Inc., P.O. Box 404, Libertyville, Ill. 60048,
Thomas J. Gilmartin, Systems Analyst; Lawrence Livermore National Laboratory, Livermore, Calif.,

Serial Information: Civil Engineering—ASCE, 1984, Vol. 54, Issue 11, Pg. 51-53

Document Type: Feature article


While lasers have markedly improved the accuracy of engineering, air temperature gradients can reduce that drastically. Based on a sewer project that used lasers to align all the pipe, the authors provide several methods of overcoming this problem. One is to move the laser along the pipe as construction progresses; the other is to install a blower in the pipe with the laser to mix the air and prevent temperature gradients from forming, which will decrease the amount of deflection. Deflection versus distance is plotted in a table, the accuracy of construction lasers are measured, their capabilities are described, and general guidelines are offered to help prevent deflection from occurring in construction work.

Subject Headings: Air temperature | Pipelines | Construction management | Displacement (mechanics) | Temperature effects | Lasers | Sewers | Alignment

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