Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1997-08-28
2000-04-04
Font, Frank G.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
25033913, G01J 508, G01N 2184
Patent
active
060468149
ABSTRACT:
The invention relates to an additional feature for use in a measuring sensor which is used for analyzing mediums spectroscopically. The measuring sensor comprises: a radiation source (1), emitting radiation which travels through a first window (3a) of a sample chamber (2), an absorption length (L1) and further a second window (3b) of the sample chamber (2), the sample chamber being provided, if necessary, with flow connections for a gas mixture; at least done detector (9), which is optically directed towards the second window; at least one optical filter (8), which is permeable to a certain wavelength band, or a radiation dispersion device between the radiation source and the detector. Between the first sample chamber window and the radiation source, the feature comprises a length (L2) and/or, between the second window and the detector, a length (L3), totalling at least about 20% of the absorption length. The length (L2) between an inner surface (13a) of the first sample chamber window and the radiation source and/or the length (L3) between an inner surface (13b) of the second window and the detector or, respectively, detectors are constituted over substantially all other sections of the radiation path, except those in alignment with possible accessories, by a solid material (7) transmissive to the applied radiation wavelengths. This material is preferably homogeneous at least in the direction transverse to a main radiating direction (R).
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A Reliable, Accurate CO.sub.2 Analyzer for Medical Use, Rodney J. Solomon, Hewlett-Packard Journal, Sep. 1961, pp. 3-9.
Karlsson Kai
Weckstrom Kurt Peter
Font Frank G.
Instrumentarium Oy
Smith Zandra V.
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