# Linearized and Compensated Interferometric System for High-Velocity Traceable Length Calibration on a Metre Scale

## TL;DR

This paper presents a high-velocity, traceable length calibration system using interferometry and environmental compensation, achieving micron-level accuracy for a 3.5-meter measurement over fast movements.

## Contribution

The system integrates laser interferometry with real-time environmental compensation and scale linearization, enabling high-speed, accurate length calibration on a meter scale.

## Key findings

- Achieved micron-level accuracy in length measurement.
- Operated reliably at translation speeds over 0.1 m/s.
- Demonstrated effective environmental influence compensation.

## Abstract

We report on a traceable calibration system for a 3500mm-long console that carries a measurement system for inspecting the diameter of a circular reactor chassis. The system uses two single-pass laser interferometers with homodyne fringe detection for measurement in two degrees of freedom. The hybrid FPGA-microcontroller control module carries out the fringe detection together with the application-specific scale linearization approach and the compensation of environmental influences such as thermal elongation and the refractive index of air fluctuations. We demonstrated the system feasibility with an accuracy of a few microns and translation velocity higher than 0:1 metre per second.