MEASUREMENT OF TEMPERATURE OF ATMOSPHERE BY COHERENT ANTI-STOKES RAMAN SPECTROSCOPY

摘要

PURPOSE:To achieve a higher measuring accuracy in temperature of atmosphere using maximal values of two or more signal spectrums in the order of rotation of a gas. CONSTITUTION:Second high frequencies of a wide-band pigment laser 2 and an Nd:YAG laser 3 are used as a laser beam 1 for excitation by being adjusted with a dichroic mirror 4 and a wide-band pigment laser beam identical to the wide-band pigment laser 2 used as the laser beam 1 is used as laser beam 5 for measurement. Then, the laser beam 1 and the laser beam 5 are made to enter a heating furnace 7 through a lens 6 to generate a rotational CARS light 8. The laser beam 1 out of the laser beams outputted is removed with a beam damper 10 through a lens 9 and the Kerr's light 8 is made to enter a spectro scope 14 through a mirror 13 after laser beam 5 contained therein is removed with a beam damper 12 being separated with a dichroic mirror 11 and analyzed to be detected with a detector 15. A CARS signal detected with the detector 15 is applied to an arithmetic device 16 to compute a spectral intensity thereof and the results of computation are shown on a display 17.