ABSTRACT
Several kinds of spectrophotometers have some parts in common, particularly spectrophotometers UV-visible and infrared. This chapter deals with these parts. Concerning the sources, the principal possibilities for the production of light are temperature radiations and luminescence collision. One can also use laser sources. They are particularly interesting because they are sources of high intensities, they give narrow bands. An appendix of this chapter completes these data. As wavelengths selectors and monochromators are cited in the chapter the absorption filters, interference filters and monochromators of the kind gratings. There are also numerous common measurement cells in plastic and glass and microplates (96 or 384 holes) authorizing measurements at high temperatures. The measurement of the radiant energy is now essentially carried out with radiation transducers which are photon transducers and heat transducers. Phototransducers are generally not applicable in the infrared domain because of a lack of energy in their photons. Therefore, thermal transducers such as thermocouples or bolometers are used. From the standpoint of their configuration, spectrophotometers can be mono-channel or double-channel.
