Method and apparatus for analyzing gaseous samples

A measuring apparatus for measuring a spectrum of a gaseous sample includes a tunable laser light source to provide an illuminating light beam, a sample cell with an inner surface to provide scrambled light that is transmitted through the gaseous sample, a detector to detect intensity of transmitted scrambled light and a pressure control system to maintain an absolute pressure of the gaseous sample smaller than 50 kPa inside the sample cell to reduce spectral widths of spectral features of the gaseous sample. The measuring apparatus measures spectral transmittance values of the sample by modulating the spectral position of the illuminating light, and detecting the intensity of the transmitted light at different spectral positions. The divergence of the illuminating light beam in a transverse direction is greater than 20 degrees to cause multiple consecutive reflections of the scrambled light from the inner surface.

Patent family as of 21.7.2026
CN114729877 A, DE602020022008 D1, EP4042140 A1, EP4042140 B1, EP4042140 C0, FI130319 B, FI20195866 A, US11774350 BB, US2022364984 AA, WO21069800 A1