| abstract |
(57) Abstract: A spectrum device suitable for an imaging spectrometer having a wide spectrum bandwidth is provided. In the case of a concentric spectrometer of the type derived from an Offner mirror objective lens, instead of a regular grating, one or more curved prisms (6, 61, 62, 63) known as Ferri prisms are used. ) Is used. The deviation from the concentric form is used as a correction means. It is particularly suitable as an imaging spectrometer equipped with a detector array, as it allows a two-dimensional image to be formed without distortion or curvature in both the positional and spectral coordinates. |