Resumen
Precision metrology is important for understanding and monitoring various phenomena, especially in special and scientific applications. The subject of the article covers selected aspects of the study of high-resolution measurements of the absorption spectra and their impact on practical issues. This research is crucial for the development of new systems based on laser absorption spectroscopy methods that can detect trace amounts of matter. Some of the most important parameters describing measuring instruments are also defined and illustrated. Specific examples of measurement results are presented, taking into account the need for the highest possible resolution, accuracy and precision.