With the laser scan micrometer, the measurement point is only one dimensional. It is impossible to measure multiple points simultaneously or to correct the measurement for target inclination.
2D measurement captures all of the target information at once. The measurement is based on the 2D image projected on the CMOS receiver. This allows measurement at desired points or measurement with position correction, which is only possible with a 2D device.
The path of the laser scan varies with every sampling cycle due to the surface accuracy of the rotating polygon mirror used to generate the scan. The laser scan technique is also affected by inconsistent motor rotation which degrades over time. The longer the instrument is used, the greater the inconsistency of the laser scan.
The 2D method allows measurement of the entire range in one instant. Since no scanning laser is used, a specified point can be defined precisely.
The motorized mechanism decreases durability and requires maintenance. There is also a concern about laser deterioration due to electrical noise.
[ No motorized mechanism ]
A system with no moving parts provides higher durability. This eliminates the problem of motor durability which has been a disadvantage of laser scan micrometers.
[ Ultra long life LED ]
The GaN (Gallium Nitride) LED used as a light source has achieved high reliability without being affected by light source deterioration due to electrical noise.
A semiconductor laser beam is projected onto a polygon mirror which
is rotated by a motor to scan the measuring range.
The time in which the laser beam is interrupted by the target is measured to obtain the dimension of the target.