Simultaneous Measurements of Density, Temperature and Pressure in Rarefiel Gas Flowfields by a Combined LIF Intensity and Lifetime Technique

Abstract

A combined LIF (Laser Induced Fluorescene) intensity and lifetime technique is proposed to measure simultaneously local density, temperature and pressure in rarefied gas flow fields. The theoretical principle is firstly introduced, taking account of the hyperfine structure broadening effect, and then its experimental verification is carried out. As a result, the present LIF measurement technique is found to be attractive.