Abstract:
The invention relates to a system (1) for confocal Raman-spectroscopic measurements, comprising at least the following components: - a sample chamber (10), wherein said sample chamber (10) is configured to house a sample (2) in a closed chamber volume (12) of the sample chamber (10), - an excitation light source (3), - an objective lens (4), configured to focus excitation light (32) of the excitation light source (3) through a ceiling portion (11) of the sample chamber (10) in a focal volume (31) in the chamber volume (12) and to collect inelastically scattered light (33) stemming from the focal volume (31), - a confocal detection arrangement (20), comprising means for a confocal detection (22, 23) of a Raman signal comprised in the inelastically scattered light (33) from the focal volume (31), and a detector (21) that is configured to detect and to record said Raman signal, wherein the distance (5) between the ceiling portion (11) of the sample chamber (10) and the focal volume (31) is greater than one millimetre during operation of the system (1).
Abstract:
The invention relates to a supporting substrate used for the deposition, automated recognition and spectroscopic identification of particulate contaminants in liquid or gaseous media. The inventive supporting substrate comprises a filter membrane from polymer materials with a defined pore width. The surface of the filter membrane is coated with metal that does not represent any spectral features for the spectroscopic identification in the selected wavelength range and absorbs no or only a small portion of the irradiated laser energy at the selected excitation wavelength and that has a very smooth structure.
Abstract:
The invention relates to a supporting substrate used for the deposition, automated recognition and spectroscopic identification of particulate contaminants in liquid or gaseous media. The inventive supporting substrate comprises a filter membrane from polymer materials with a defined pore width. The surface of the filter membrane is coated with metal that does not represent any spectral features for the spectroscopic identification in the selected wavelength range and absorbs no or only a small portion of the irradiated laser energy at the selected excitation wavelength and that has a very smooth structure.