1. Beam steering is a result of large gradients in the refractive index of the combusting gases. This causes the laser beam to wander and bloom.47-50As a result, part of the light signal does not make it into the light collection system, leading to reduced signals which can be misconstrued as molecular absorption. The beam steering can be seen on the reference laser signals in Figure 11. Careful optical engineering was performed in an effort to mitigate the effectsofbeamsteering (for example, tighteropticalalignment, large collection fiber, thinwindowsto get optics
2. 120910_0010 6.0 Diluted 1540 1532 -2.7
3. 121410_0015 4.25 Diluted 1393 1338 -4.0
4. 120910_0013 6.0 Undiluted 2103 1988 -5.5