Related Experiment Video
Updated: Apr 8, 2026
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
Published on: May 15, 2017
Stroboscopic Surface Thermal Lensing for Fast Detection of Thermal Defects in Large-Scaled Coating Films
Chunxian Tao1, Dawei Zhang1, Ruijin Hong1
1Shanghai Key Laboratory of Modern Optical System, Optical Instruments and Systems Engineering Research Center, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China.
Abstract:
A stroboscopic surface thermal lensing (SSTL) system for the fast detection of thermal-induced defects in large-scaled optical coating films was constructed. The SSTL signal was generated by a set of double-modulators and captured by a high speed matrix camera, respectively. The spot size of both pump laser and probe laser expanded for larger detection area was finished in a single step. Based on the STL technique, both the mapping of amplitude and the phase of SSTL signal on the whole area of the coatings can be achieved simultaneously.
