A common question arising during the design and fabrication of spectral instruments arranged according to the Paschen–Runge scheme with non-classical concave diffraction gratings concerns the permissible deviation of the scheme parameters (distance from the slit to the grating, incident angle, displacement of the photodetector from the dispersion plane) from the calculated ones at which the spectral resolution degrades insignificantly. Computer simulation using ZEMAX software was carried out for two gratings used in the Grand-2 spectral instrument (VMK-Optoelektronika), and the simulation results were validated against the experimental data. The spectral resolution limit increased by 10% or less for the following ranges of the scheme parameters for the grating with curved grooves: distance from the slit to the grating of 895±6 mm, angle of incidence of rays on the grating of (26.5±0.4)o, and displacement of the linear photodetector from the dispersion plane of ±0.6 mm; for the varied line-space (VLS) grating with curved grooves: distance from the slit to the grating of (987.5±9.0) mm, angle of incidence of rays on the grating of (20.3±2.2)o, and displacement of the linear photodetector from the dispersion plane of ±1.15 mm. These tolerances are easily sustained in the fabrication of the spectral instrument resulting in achieving excellent resolution characteristics of 8 pm in the range of 190–350 nm and 25 pm in the range of 350–855 nm.

I. A. Zarubin

A. A. Syrbakov

V. A. Labusov

Analitika i kontrolʹ

Analitika i Kontrol  is a scientific journal covering theoretical and applied aspects of analytical chemistry and analytical control, published since autumn 1997.    Founder and publisher of the journal is the Ural Federal University named after the first President of Russia Boris Yeltsin (UrFU, Ekaterinburg).

Analitika i Kontrol is a scientific journal that covers both theoretical and applied aspects of analytical chemistry and analytical control. It has been published since autumn 1997. The journal is founded and published by the Ural Federal University named after the first President of Russia, Boris Yeltsin (UrFU, Ekaterinburg).

《Analitika i Kontrol》是一本科学期刊，涵盖了分析化学和分析控制的理论与应用方面，自1997年秋季开始出版。期刊的创办和出版单位是俄罗斯第一任总统鲍里斯·叶尔钦命名的乌拉尔联邦大学（UrFU，叶卡捷琳堡）。

Influence of misalignment on spectral resolution in a Paschen–Runge optical system

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