8. Conclusion

The dispersive systems used in spectrometry have made considerable progress over the last twenty years. This is due to interest in new radiation sources such as ICP plasma or glow discharge lamps, the availability of gratings with a large number of features thanks to the interferometric grating technique, the revival of ladder gratings for two-dimensional spectra, much greater mechanical precision for driving moving parts, e.g. grating rotation, and the writing of algorithms for peak recognition and spectral background measurement. This justifies their commercial development, their diversity and the number of instrumentation companies involved in this field.