How do Mitutoyo laser micrometers work? The fundamental component of every Mitutoyo laser micrometer is the laser beam itself. The beam is directed toward a polygonal mirror that rotates within the device at a high speed while synchronizing with regular and stale pulses from a system clock. Once the beam is reflected, it rotates clockwise while sweeping across the input surface on a lens. The beam always changes direction in order to be horizontal following the lens exit surface. The horizontal laser beam enters the open workspace where a part may be placed. Should there be no interfering part being measured, the beam reaches a receiver through a condensing lens, thereby producing an output signal. The time during a sweep when the laser beam is interrupted by a part is indicated by the pulsing clock where the receiver signal is absent. This time is proportional to the part dimension in the downward direction. The edge is defined as each of the transitions between the receiver detecting the beam and then not detecting the beam. The edge marks the start or end of the measuring sections, allowing the differences in position of each edge to define the length of each section. These edges and sections are numbered sequentially and result in the eventual dimensional data output.