Laser induced breakdown spectroscopy (LIBS) is used for the investigation of element composition on the surface of building materials. From cores depth profiles are available.
No sample preparation is necessary. The measurement can be performed directly on the sample surface. Within one measurement information about the content of the main elements (Ca, Si , Al, etc.) and also of trace elements (Cl, S, N, etc.) are available. All elements are detectable, the results are available directly after measurement.
By a short intense infrared laser pulse a small amount of the material under investigation is ablated and vaporised. A plasma plume is formed. Due to a spectroscopic analysis of the plasma radiation the content of the elements in the vaporised material can be detected. To get quantitative results a calibration is necessary.
Objectives are the analysis of the composition of mineral building materials, the measurement of the content of substances which may cause damage, the investigation of glasses, and the examination of the environmental impact on buildings and soils.
Photograph of a concrete specimen with a focused laser beam hitting the surface. The plasma is the bright spot on the surface. Fluorescence light is collected by the open end of an optical fibre and is guided to the detection system.
Comparison of chlorid profiles, measured on a concrete core with LIBS and standard chemical analysis.
This method can be applied on-site after modification.
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Division 8.2
Dr. rer. nat.