Laser alignment measuring and testing equipment based on interference fringe
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1.
Department of Enlisted Man, the Academy of Equipment Command & Technology, Beijing 102200, China;
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2.
State KeyLaboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
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Received Date:
2008-07-23
Accepted Date:
2008-09-16
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Abstract
A laser alignment system based on interference fringe was developed to test the alignment of a rail.After being collimated and broadened,a semiconductor laser was irradiated onto a wedge.Reflecting on the front and back surfaces of the wedge,the laser beam was divided into two cross beams at an angle of 2α,leading to interference fringes in the crossing zone.The interference beam was used to be the measuring reference,and a linear CCD was fixed on the receiving target.The offset distance between the measured point and the measure reference was obtained by detecting the interference position on the receiving target. The stability and repetition of the measuring system was tested.The test results were compared with those obtained with a photoelectricity autocollimator.The alignment error was 18.96μm when the test length was 842mm.The maximum test length was up to 14m.The results indicate that the performance of the sample device met the scheduled target.
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