Accuracy Improvement of a Laser Diode-Based System for Measuring the Geometric Errors of Machine Tools

Active methods are proposed to improve the measurement accuracy of a compact laser diode-based (LD-based) system, which is designed measure geometric errors machine tools. The LD has some advantages, such as small size, low cost and high efficiency. However, spot elliptical stability in output power low, limits where used source. An active shaping method shape without adding additional optical elements. In addition, beam drifts, including linear drift angular drift, compensated real-time by improved error compensator, consists two feedback units Backpropagation Neural Networks-based PID controller, during long-distance measurement. A series experiments were conducted verify effectiveness capability constructed LD-based system.