High-Spatial-Resolution Scanning LIDAR: Towards Accurate Inspection of Tunnel Inner Wall

Abstract

This article introduces a remote laser inspection system that detects cracks on the concrete wall of tunnels. The system consists of three features: distance measurement using an interferometer equipped with a frequency-shifted feedback (FSF) laser, high-speed and high-resolution imaging using a reflected light imaging system, and spectroscopic imaging using triple lasers with different wavelengths. The features have potential to replace conventional manual-based inspection tasks.