Читать книгу Spectroscopy for Materials Characterization - Группа авторов - Страница 27

A typical experiment of absorption consists in the investigation of the light transmitted by a given sample. The block scheme of the instrumentation has been presented in Section 1.3.1 and it includes a light source and a system to select the wavelength interacting with the sample. Two possible configurations are typically used. In the first, the wavelength of the source is selected by a monochromator and it is sent to the sample and the transmitted light is detected. In the second, all the radiation of the source is sent to the sample and the analysis of the wavelength is done after the sample by a grating and a CCD. Obviously, in each case, a blank or a reference spectrum of the source should be done without the sample to determine the intensity of light arriving at the sample before to traverse it and give rise to the absorption process. In Sections 1.4.1.1, 1.4.1.2 examples of the practice to apply to obtain good spectra are reported.