Oxygen Fluorescence as a Means for Temperature and Pressure Measurement

The application of interest in this work is the measurement of air temperature and pressure using broadband laser-induced fluorescence (LIF). Because of the cost, bulkiness, and operating complications of ArF lasers, a xenon flashlamp is used instead of LIF. The oxygen is excited by photons in the 185–200nm range. Large wavelength windows (100nm and 65nm) are used to reduce the fluctuations in the total measured fluorescence. A correlation between temperature and fluorescence ratio is developed with an error in fluorescence ratio of approximately ±1.3%, resulting in an error in temperature of ±1.35° C for temperatures from 25–50° C.Copyright © 2003 by ASME