Klasifikace vzorků cihel pomocí spektrometrie laserem indukovaného mikroplazmatu

Classification of brick samples by remote Laser-Induced Breakdown Spectroscopy - comparative study.

abstrakt

en

Preservation of cultural heritage is gaining increasing attention all over the world. Many historical objects are essentially made of bricks. Damaged brick identification and classification is important for reparation of disturbed brick constructions. The causes of degradation should be detected and for replacement the most compatible material, stable at given climate conditions, should be chosen. Laser-Induced Breakdown Spectroscopy can be used for fast classification of different type, origin and degree and cause of the masonry damage. One of the unique capabilities of Laser-Induced Breakdown Spectroscopy (LIBS) is the ability to perform real-time and remote measurements in the field, where the sample can be distant several meters from the instrumentation. This can be advantage for analyses of e.g. difficult to reach wall segments. In this comparative study thirty three samples of bricks were analyzed using two remote LIBS systems. Both of the systems were equipped with an Echelle spectrometer-based detection system (Andor Mechelle spectrometer coupled to the Andor Istar 734i ICCD detector and ESA 4000, LLA Instruments, Germany). The elemental composition of the samples after their total decomposition was measured also with an optical ICP – OES spectrometer (Jobin Yvon 170 Ultrace). The results of these analyses were processed using advanced statistical tools, by focusing on the development of a method for bricks classification, which could be used without the need of knowledge of absolute elemental composition. The outcomes suggest that remote LIBS technique will make possible real-time sorting of the masonry material directly in-situ.

Práce pojednává o aplikaci analytické techniky LIBS na klasifikace vzorků cihel. Je zde diskutováno možnost využití tohoto postupu v archeologii, konkrétně v restaurátorství a klasifikaci stěn historických objektů.

Preservation of cultural heritage is gaining increasing attention all over the world. Many historical objects are essentially made of bricks. Damaged brick identification and classification is important for reparation of disturbed brick constructions. The causes of degradation should be detected and for replacement the most compatible material, stable at given climate conditions, should be chosen. Laser-Induced Breakdown Spectroscopy can be used for fast classification of different type, origin and degree and cause of the masonry damage. One of the unique capabilities of Laser-Induced Breakdown Spectroscopy (LIBS) is the ability to perform real-time and remote measurements in the field, where the sample can be distant several meters from the instrumentation. This can be advantage for analyses of e.g. difficult to reach wall segments. In this comparative study thirty three samples of bricks were analyzed using two remote LIBS systems. Both of the systems were equipped with an Echelle spectrometer-based detection system (Andor Mechelle spectrometer coupled to the Andor Istar 734i ICCD detector and ESA 4000, LLA Instruments, Germany). The elemental composition of the samples after their total decomposition was measured also with an optical ICP – OES spectrometer (Jobin Yvon 170 Ultrace). The results of these analyses were processed using advanced statistical tools, by focusing on the development of a method for bricks classification, which could be used without the need of knowledge of absolute elemental composition. The outcomes suggest that remote LIBS technique will make possible real-time sorting of the masonry material directly in-situ.

LIBS, remote LIBS, brick samples, sorting, classification

28.08.2011

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