Research On Obtaining Temperature By Using The Relative Intensity Of The Hydroxyl Radical Spectrum In The Ultraviolet Band

In the plume spectrum of hydrogen-oxygen fuel, the radiation spectrum of hydroxide radical (OH) is an obvious feature in the ultraviolet (UV) band. Since the control temperature can be determined by the relative intensity of a single transition, the Hitran database is used to analyze the OH spectrum structure, then two sets of temperature-sensitive peaks are found, corresponding to the OH ( A(2) Sigma, v' -> chi(2) Pi, v '' = 0) and OH (A(2) Sigma, v' = 1 -> X-2 Pi, v '' = 1) transitions, respectively. The law of the two groups of peaks with temperature is analyzed in the temperature range of 600-3300K, and the method of determining the control temperature can be obtained by knowing the relative intensity, which provides a way for the temperature inversion in the ultraviolet band.