Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1995-11-30
1998-07-14
Font, Frank G.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356437, 250373, 250374, G01N 2100
Patent
active
057813060
ABSTRACT:
A spectrometric gas measurement apparatus for the determination of the presence and/or concentration of gases in a spatial region has a spectrometric measurement head which transmits into the spatial region measurement radiation having the spectral ranges necessary for the determination of the gases. Furthermore, a reflector is provided at the spatial region which reflects the light which is passed through at least a part of the spatial region back to the measurement head where it is split up spectrally in an analyzer and then supplied to a photoreceiver arrangement. A measurement tube extending in the direction of light propagation is provided in the spatial region through which the measurement light passes. The measurement tube has a transverse throughflow opening, is closed at the end remote from the measurement head, accommodates the retro-reflector, and is also supplied at both ends of the transverse throughflow opening with flushing air which stands at a slight excess pressure relative to the spatial region. A reference tube with an audit cell is inserted in front of the measurement tube.
REFERENCES:
patent: 3861809 (1975-01-01), Hall, Jr.
patent: 4126396 (1978-11-01), Hartmann et al.
patent: 4560873 (1985-12-01), McGowan et al.
patent: 5241368 (1993-08-01), Ponstingl et al.
Hartig Wolfgang
Kaufmann Jurgen
Erwin Sick GmbH - Optik-Elektronik
Font Frank G.
Stafira Michael P.
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