Development of Ultraviolet Raman Diagnostics for Rocket Engine Injector Analysis

Measurement and simulation of spontaneous Raman scattering in high-pressure fuel-rich H2–air flames

“…Based on the above-mentioned error estimation methodology, the change of n from 9 to 7 due to the exclusion of these two lines reduced the measurement accuracy by only 1%. As seen in figure 7 every curve is well approximated with a linear fit, which means that rotational thermal equilibrium was achieved in the [21,41] cross-talk between these molecules is not negligible. In high-pressure circumstances the cross-talk is a complex issue if pressure broadening or line-narrowing effects become involved.…”

“…Despite the numerous studies that use SRS in combustion studies, few studies have been made to carefully examine the SRS spectral response in high-pressure combustion systems. Examples of the few SRS studies at high pressures including high-pressure research gas turbine combustors [18], internal combustion engines [19,20] and rocket engines [21] have been reported. Work describing high-pressure gas cell studies has also been used to confirm that SRS signals are linearly proportional to gas density [22].…”

Development of a combined confocal and scanning near‐field Raman microscope for deep UV laser excitation

“…15 Deep UV excitation has also facilitated high-temperature Raman studies since the intensity of the interfering blackbody emission from the sample is much less than with visible or infrared lasers. 16 Many Raman studies of materials have benefited from the extra spatial resolution that is available when a microscope is optically coupled to the Raman spectrometer. Following the introduction of Raman microscopy in 1974, the technological advances in the 1980s led to a great increase in its use.…”