METHOD FOR MEASURING LASER TEMPERATURE USING DEGENERATE FOUR-WAVE MIX METHOD

摘要

PROBLEM TO BE SOLVED: To instantaneously measure a temperature of a body to be measured, by measuring intensities of a first and a second signal lights corresponding to a first and a second rotational lines of a specific chemical species. ;SOLUTION: A first signal light S1 having the same wavelength as a first, a second and a third laser lights L1, L2 and L3 is emitted from NO molecules on a second optical path 9 because of an interaction of the laser lights. The first signal light S1 is detected by a first detector 2 and an intensity of the light is measured. A second signal light S2 is emitted from NO molecules on a fourth optical path 29 as a result of an interaction of a fourth, a fifth and a sixth laser lights L4, L5 and L6. An intensity of the second signal light S2 is measured by a second detector 22. A temperature is calculated on the basis of measured data of the first and second signal lights S1, S2 from a specific chemical species NO. A rotational quantum number corresponding to a wavelength corresponding to a rotational line peak is already known, and therefore an absolute temperature is calculated from a rotational quantum amount of a first wavelength corresponding to a first rotational line as one peak and a rotational quantum amount of a second wavelength corresponding to a second rotational line.;COPYRIGHT: (C)1998,JPO