Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
2008-06-10
2008-06-10
Punnoose, Roy M (Department: 2886)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C356S437000
Reexamination Certificate
active
07385703
ABSTRACT:
The method of determining, by absorption spectroscopy, the pressure of a gas mixture in a vacuum container located in an environment containing the gas to be measured, and the pressure of the gas is different from that in the vacuum container. A device comprising a laser and a laser detector measures an absorption curve AR(λ) of the gas in the beam path between the laser and the detector. The vacuum container is placed into the beam path and the absorption curve AM(λ) of the gas is determined in the beam path into which the vacuum container has been placed and the absorption curve AR(λ) is made to coincide by compression with the absorption curve AM(λA) outside of the absorption curve of the gas, the extent of compression being determined by a proportionality factor c, the following relation for determining the gas to be measured in the vacuum container being: AG(λ)=AM(λ)− c·AR(λ).
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William J. Kessler, Mark G. Allen, Steven J. Davis, Phillip A. Mulhall and Jan A. Polex, Physical Sciences Inc., 20 New England Business Center, Andover, MA 01810 1998 Photonics East, SPIE International, Symposium on Industrial and Environmental Monitors and Biosensors Nov. 2-5, 1998, Hynes Convention Center, Boston MA “Near-IR Diode Laser-Based Sensor For PPB-Level Water Vapor in Industrial Gases”.
C S Edwards, G P Barwood, S A Bell, P Gill and M Stevens National Physical Laboratory, Queens Road, Teddington, Middlesex TW11 0LW, UK Received Mar. 22, 2001, accepted for publication Apr. 30, 2001 “A tunable diode laser absorption spectrometer for moisture measurements in the low parts in 109range”.
Lavision GmbH
Punnoose Roy M
Vigil Thomas R.
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