Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
2008-05-20
2008-05-20
Lauchman, L. G. (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C250S330000
Reexamination Certificate
active
11078527
ABSTRACT:
A system is described that is suitable for use in determining the location of leaks of gases having a background concentration. The system is a point-wise backscatter absorption gas measurement system that measures absorption and distance to each point of an image. The absorption measurement provides an indication of the total amount of a gas of interest, and the distance provides an estimate of the background concentration of gas. The distance is measured from the time-of-flight of laser pulse that is generated along with the absorption measurement light. The measurements are formated into an image of the presence of gas in excess of the background. Alternatively, an image of the scene is superimosed on the image of the gas to aid in locating leaks. By further modeling excess gas as a plume having a known concentration profile, the present system provides an estimate of the maximum concentration of the gas of interest.
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Devdas Sanjay
Kulp Thomas J.
Luong Amy Khai
Reichardt Thomas A.
Lauchman L. G.
Sandia Corporation
Underwood Jarreas C
Vosen Steven R.
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