RAMAN SPECTROSCOPIC DEVICE AND RAMAN SPECTROSCOPIC METHOD OF AIR-WAY GAS

摘要

PURPOSE: To provide a device and a method for measuring the composition and the density of the airway gas of a patient in the Raman spectroscopic technique. CONSTITUTION: A laser beam 15 is transmitted along the longitudinal axis of a photowaveguide 13 in which a gas sample 14 is flowed, to generate Raman scattering throughout the guide. The Raman scattered light 16 is radiated from both ends of the guide 13, and is guided to a spectrometer 25 through a laser beam excluding filter 19, a lens 21, and a slit 23, as parallel rays formed by the lens 17. The spectrometer 25 comprises a grating spectrograph 27, and the spectral line guided from the slit 23, is Raman-shifted by the grating spectrograph 27. The Raman shift light 28 is dispersed to an optical sensor array 29. The optical sensor array 29 simultaneously measures the whole spetral of the Raman scattering from the mixture gas. The result of the measurement is sent to a computing means 30 to determine the relative or absolute density of the gas 14.