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Measurements are reported of absorption coefficient for nitrogen-diluted propane obtained by both photoacoustic spectroscopy and photothermal deflection spectroscopy using a CO/sub 2/ laser.
In this paper photothermal deflection spectroscopy (PDS) is used to measure ethylene in nitrogen in a flowing stream with velocities high enough (>100 cm/sec) that forced convection dominates over… Continue Reading
A whole-field quantitative shadow method was used to determine the temperature in a laser ignition experiment. An ethylene-air mixture was heated by a CO(2) laser, and the hot gas was illuminated… Continue Reading
This paper demonstrates two different ways in which photothermal deflection spectroscopy (PDS) can be used to measure a single spatial component of gas velocity. The first method is a transit-time… Continue Reading
A geometrical algorithm for optical ray tracing is used to trace the trajectories of probe laser beam rays in pulsed photothermal deflection spectroscopy (PDS) of a static gas. Rays are traced as a… Continue Reading
The velocity profile across a cold laminar jet of a mixture of ethylene and nitrogen gas was measured with the photo‐thermal velocimetry technique for a series of volumetric flow rates. (AIP)