Real-time focus controller for laser welding with fibre-optic non-invasive capture of light

A. Cobo, F. Bardin, D. P. Hand, J. D C Jones, O. Collin, P. Aubry, T. Dubois, M. Högström, P. Nylen, P. Jonsson, J. M. López-Higuera

Research output: Contribution to journalArticlepeer-review


Laser welding is being introduced in the aerospace industry due to its many advantages over traditional techniques. However, welding of parts with complex shapes requires precise control of the focal point of the laser in order to achieve full penetration over the entire seam. In this paper, we present an improved control system for real-time adjustment of the correct focal position, which is based on the monitoring of the light emitted by the process in two different spectral bands. The reported system has been optimized for use in a real environment: it is robust, compact, easy to operate, able to adjust itself to different welding conditions, materials and laser setups, and includes a direct connection to an external PC. Results from recent field trials on complex aerospace structures are provided.

Original languageEnglish
Pages (from-to)548-551
Number of pages4
JournalProceedings of SPIE - the International Society for Optical Engineering
Publication statusPublished - 2004
EventSecond European Workshop on Optical Fibre Sensors, EWOFS'04 - Santander, Spain
Duration: 9 Jun 200411 Jun 2004


  • Autofocus
  • Chromatic aberration
  • Focus control
  • Laser welding
  • Optical fibre
  • Optical sensor


Dive into the research topics of 'Real-time focus controller for laser welding with fibre-optic non-invasive capture of light'. Together they form a unique fingerprint.

Cite this