Seidel's Aberrations and Laser Displacement Sensors

This document explains how Seidel's five classifications of aberrations (spherical aberration, chromatic aberration, astigmatism, field curvature, and distortion) affect laser displacement sensors using the triangulation measurement method. It details the specific influences of chromatic aberration, astigmatism, and field curvature on spot shape and measurement accuracy, and describes countermeasures such as aspherical lenses and combination lenses (Ernostar lens).