The spectrometer setup will consist of an electro-optical system supplying a continuous laser beam to the tested gas sample, a radiation source and an absorption spectrum detection system. The electro-optical system will ensure precise frequency tuning and modulation of the light amplitude as well as linking the frequency to the resonance of the optical cavity. The spectrometer will enable the measurement of the absorption spectrum in the wavelength range of 1565 – 1605 nm and in the temperature range from room to 600 K. In the case of weakly absorbing particles, it will be possible to enhance the sensitivity of the optical cavity detection and to measure the absorption using the cavity ring-down technique. The system will also enable the measurement of the dispersion spectrum using the cavity mode dispersion spectroscopy technique.
The system will enable precise spectroscopic measurements of particle vibrational transitions, in particular the frequency, intensity and collision effects of the line shape. The absolute frequency measurement will be performed by a wavemeter with an uncertainty below 0.003 cm-1. The design of the system will enable future adaptation to even higher accuracy of the absolute frequency measurement using an optical frequency comb, or the extension of the spectral range by replacing several electro-optical elements.
0000-0001-5545-7989
