PolyU’s IntraSpect™ “industrial eye” redefines precision manufacturing

Behind every electric vehicle battery, smartphone component or high‑performance electronic device lies an invisible challenge: how to weld metals perfectly, every single time.

Even a microscopic defect too small for the human eye to see, can weaken a joint, shorten a product’s lifespan, or trigger costly failures down the line. In a world increasingly built on advanced manufacturing, this problem has enormous consequences for safety, sustainability, and competitiveness.

IntraSpect™ is designed to eliminate this industry pain point by ensuring defect-free welds. Developed by a PolyU research team, led by Professor H.C. Man, Dean of the Faculty of Engineering, Cheng Yick-chi Chair Professor in Manufacturing Engineering and Chair Professor of Materials Engineering, and Professor Wen Xiewen, Assistant Professor of the Department of Industrial and Systems Engineering, the third-generation, intelligent in-situ laser melt pool monitoring technology represents a genuine breakthrough in high-end precision manufacturing.

Proactive prevention reduces waste

Advanced manufacturing relies heavily on laser‑based welding processes, which are fast, flexible, and ideal for high‑value applications. However, they are also notoriously difficult to control. When a laser melts metal, the intense light and thick vapour hinders visibility into the so‑called “melt pool”—the tiny, molten zone which directly influences the quality of a weld. Manufacturers typically inspect welds after production, discarding defective parts and absorbing any losses. But this reactive approach wastes materials, increases energy consumption and creates quality concerns. And these issues ripple through supply chains in a wide range of industries, including electric vehicles, electronics, and aerospace.

IntraSpect™ tackles this challenge head‑on by enabling manufacturers to monitor and control the welding process in real time, rather than fixing problems after the fact. By integrating high‑frequency optical tomography with a multi‑modal AI engine, IntraSpect™ creates what engineers describe as an “industrial eye”, which is capable of seeing through metal vapour. It captures micron‑level, three‑dimensional images of the melt pool as the welding is actually happening. This allows defects, such as porosity and incomplete fusion, to be detected and corrected instantly before they can become expensive failures.

For manufacturers, the benefits reach far beyond quality control. Real‑time prevention reduces waste, improves energy efficiency and accelerates production—directly supporting sustainability goals and high‑quality industrial growth.

From laboratory breakthrough to factory floor

The appeal of IntraSpect™ lies not just in its sophisticated technology, but also in its readiness for real-world deployment. Designed with industrial environments in mind, it matches the performance of top-tier global solutions at roughly half the cost, and delivers a return on investment in less than a year.

This makes the technology particularly attractive for fast‑growing industries, such as new‑energy vehicles and electronics manufacturing, where margins are tight and scale matters. Instead of relying on expensive imports, manufacturers can adopt a locally developed solution that meets global standards while delivering immediate business value.

In the long term, the technology has additional potential for extension to medical devices, aviation, aerospace, and other sectors with extremely stringent welding quality requirements.

A RAISe+ winner

IntraSpect™ exemplifies PolyU’s commitment to integrating academia, industry and research for societal benefit. Developed in close collaboration with industry partners, the technology is designed for seamless adoption on production lines, accelerating the translation of research into real-world applications. It reflects how university innovation can respond directly to industrial needs, strengthening manufacturing capability while remaining globally competitive.

In April 2026, IntraSpect™ received funding under the third round of the HKSAR Government’s Research, Academic and Industry Sectors One‑plus (RAISe+) Scheme, recognising its strong commercial and societal potential. The support will drive wider deployment, deeper industry collaboration and stronger technology transfer, enabling higher welding quality, reduced waste and more sustainable industrial growth.

The IntraSpect™ project is led by Professor H.C. Man (right) and Professor Wen Xiewen.