Optical Coherence Tomography Provides Structural Analysis

In the Winter 2025 issue of Vision Spectra magazine, Excelitas Product Manager Matt Angstadt examines how optical coherence tomography (OCT) is gaining momentum as an industrial imaging technology for applications where traditional camera-based machine vision falls short.

The article explains how OCT uses near-infrared (NIR) light and interferometry to generate cross-sectional images or detailed surface topography, enabling visualization of features that cannot be captured with conventional imaging systems. Compared to alternatives such as x-ray, CT and ultrasound, OCT offers a compelling balance of high resolution, production-speed acquisition and lower system complexity for many inspection and measurement tasks.

Several industrial use cases are highlighted, including real-time laser weld monitoring, where OCT can measure keyhole depth and support automated process control. The technology also enables inline measurement of conformal coating thickness on printed circuit board assemblies and high-speed inspection of flat panel displays, allowing manufacturers to detect defects and verify layer integrity during production.

While OCT has limitations related to penetration depth and application-specific cost considerations, the article positions it as a powerful complement to existing inspection technologies. Read the full article, “Optical Coherence Tomography Provides Structural Analysis,” in Vision Spectra to learn how OCT is expanding the industrial imaging toolbox by enabling high-resolution subsurface analysis and real-time process guidance for advanced manufacturing applications.