METHOD OF MEASUREMENT OF PRISM SPECTROMETER LINE DISPERSION Russian patent published in 1997 - IPC

FIELD: optical spectrometry. SUBSTANCE: the method consists in formation of the spectral pattern and determination of unknown line dispersion D_x. The novelty consists in the fact that the spectral pattern is formed in a continuous spectrum at illumination of the instrument by light of an incandescent lamp, and unknown line dispersion D_x is measured by its comparison with dispersion D_y introduced in the light beam of a standard echelon grating installed relative to the prism spectrometer according to the crossed instrument network and having a hole in its frame, through which the bearing part of the primary light beam passes into the instrument escaping the grating. The spectral pattern arises in the focal plane of the instrument chamber in the form of a narrow horizontal dispersion spectrum produced by the bearing beam, and a combination of narrow inclined diffraction spectra formed as a result of joint action of the grating and prism and crossing the dispersion spectrum at angles α_pah. The value of angle α_pah depends on ratio D_x/D_y. Therefore, for determination of unknown dispersion D_x only a single pattern parameter - angle α_pah is measured. EFFECT: facilitated procedure. 4 dwg