The measuremen t of the spectral emlSSlVl ty of heated substances may be accomplished by comparing the energy emitted by the substance under study 'with that emitted by a standard substance for radiation at various wavelengths. For such a standard one usually uses a blackbody, that is, a hollow body provided with a hole for viewing the radia tion inside. The inside surface of the blackbody must...

A project of an X-ray monochromator for the «SKIF» synchrotron based on two flat mirrors with multilayer reflective coatings is reported. The concept absence precision mechanical systems and feedthroughs in vacuum, which significantly reduces mirror surface contamination increases scanning accuracy. In addition, overall structure device greatly simplified this way, turn leads to a significant r...

The paper presents two procedures for the wavelength calibration, in the oxygen telluric absorption spectral bands (O2-A, λc = 687 nm and O2-B, λc = 760.6 nm), of field fixed-point spectrometers used for reflectance and Sun-induced fluorescence measurements. In the first case, Ne and Ar pen-type spectral lamps were employed, while the second approach is based on a double monochromator setup. Th...