Identification, mapping, and quantification of asbestos minerals in ACM and NOA using NIR-SWIR hyperspectral scan imaging: Preliminary study.

Here, we aimed at extending the Near Infrared-Short-wave infrared (NIR-SWIR) spectroscopy approach in characterizing Asbestos Containing Materials (ACM) and Natural Occurring Asbestos (NOA) through the development and testing of a novel portable asbestos mapping tool based on Hyperspectral Imaging (NIR-HSI) tool. This was built using high resolution spectroscopy over a range of about 170 nm around the OH overtone bands (about 1370-1420 nm), a supercontinuum laser for vibrational excitation, compact XYZ translation stages, and dedicated software. The vibrational reflection data measured using this system allowed discriminating different asbestos minerals and to define the methodological basis for their quantification in various matrices.

Novel Probe for Thermally Controlled Raman Spectroscopy Using Online IR Sensing and Emissivity Measurements.

Temperature rise during Raman spectroscopy can induce chemical alterations of the material under analysis and seriously affect its characterization. Thus, such photothermal side effects can represent a serious problem to be carefully controlled in order to safeguard the integrity of the material and its spectral features. In this work, an innovative probe for thermally controlled portable Raman spectroscopy (exc.

Quantitative Compositional Analyses of Calcareous Rocks for Lime Industry Using LIBS.

Here, the potential of laser-induced breakdown spectroscopy (LIBS) in grading calcareous rocks for the lime industry was investigated. In particular, we developed a system equipped with non-intensified detectors operating in scanning mode, defined a suitable data acquisition protocol, and implemented quantitative data processing using both partial least squares regression (PLS-R) and a multilayer perceptron (MLP) neural network. Tests were carried out on 32 samples collected in various limestone quarries, which were preliminarily analyzed using traditional laboratory X-ray fluorescence (XRF); then, they were divided into two groups for calibration and validation.