Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1993-01-19
1995-01-24
Willis, Davis L.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
73 3102, 250343, G01N 2131, G01N 2135
Patent
active
053846400
ABSTRACT:
A gas sample chamber that is particularly advantageous for use with a semiconductor laser has the form of an elongated hollow tube with a specularly reflective inside surface, a semiconductor laser located at one end of the tube and a detector located at the opposite end of the tube. In one embodiment, apertures in the wall of the tube permit a gas to enter and leave the sample chamber by free diffusion. In another embodiment the gas flows into the hollow tube from a pressurized source through a port or is drawn through the tube by a suction pump. In other embodiments, the tube is partitioned into two successive sections by means of a window located within the tube. The window is transparent to radiation of two different wavelengths that coincide with the absorption bands of two different gases. The semiconductor laser is tuned to these wavelengths successively so that two gas components can be detected and measured simultaneously.
REFERENCES:
patent: 4236827 (1980-12-01), Horiba et al.
patent: 5015094 (1991-05-01), Nagai et al.
patent: 5163332 (1992-11-01), Wong
Gaztech International Corporation
Keesee, II LaCharles P.
McKown Daniel C.
Willis Davis L.
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