In this paper, we describe the design and development of a polygon laser scanner for undulator magnet size measurement studies. In the laser scan micrometer, a laser light source is focused on to the facets of a rotating polygon mirror that reflects the laser beam. The parallel light emerging from the polygon surface falls on the object through a F-theta lens. The object obstructs the light. A lens at the opposite side of the object collects and focuses the light onto a detector. The shadow caused by the obstruction results in an output voltage for a period of time that is proportional to the size of the object. The method is used for undulator magnet size measurements for free electron laser applications.

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