Precise monitoring of fast processes
Laser speckle photometry (LSP), developed at Fraunhofer IKTS, is a new method for inline monitoring of industrial processes. Systems based on LSP are cost-effective, analyze surface properties and draw conclusions about surface defects, porosity or thermal properties for almost all material classes.
With laser speckle photometry, the porosity and surface defects of a wide range of materials can be determined non-destructively without great effort. It is now possible to detect changes in porosity of 2% and surface defects in metallic materials smaller than 10 µm using correlation function and AI analysis. The LSP system presented at Control consists of sensors, electronics, hardware and software as well as the evaluation algorithm. During the measurement, the surface heats up by a few Kelvin due to a short laser pulse. This creates a dynamic speckle pattern whose characteristic change over time allows defects in the material to be detected without affecting the component. Thanks to its modular design, the test method can be adapted to a wide range of tasks. Due to the extremely short measuring times of the LSP, the method is well suited for inline use in industrial production and for in-situ measurements during maintenance and repair tasks.