Combustion Diagnostics for Microgravity Research Using Near-Infrared Diode Lasers
Combustion Diagnostics for Microgravity
Research Using Near-Infrared Diode Lasers
Southwest Sciences, Inc.
1570 Pacheco Street #E-11
Santa Fe, NM 87501
Joel A. Silver
An improved method for measuring species concentrations and temperature will be
developed for microgravity combustion research. The method will utilize inexpensive,
room-temperature, laser diodes to measure absorption by important species in the
fuel, oxidizer, and combustion products at near-infrared wavelengths. Combining these
lasers with high-frequency detection techniques should result in a non-intrusive
instrument with high sensitivity, wide dynamic range, and extremely fast-response
time that is also useful for measurement of gas temperature in combustion flows.
In comparison with other optically-based methods for measuring combustion species
concentrations, the approach taken in this project uses exceptionally reliable and
inexpensive laser sources that can readily be combined with fiber optics for multi-point
monitoring. The feasibility of the technique will be demonstrated in Phase I by measurements
in a room-temperature absorption cell and in the post-flame gases of a methane-air
Potential Commercial Application:
Potential Commercial Applications: Commercial applications may be expected in combustion
process monitoring and control, gas monitoring in industrial chemical processes,
pollutant and toxic gas sensing, and measurement of trace atmospheric species.