Pollution monitor with self-contained calibration and cell-block

Details Pollution monitor with self-contained calibration and cell-block Pollution monitor with self-contained calibration and cell-block

1974-10-04

1976-03-16

Borchelt, Archie R.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

250252, 250461R, G01D 1800, G01J 142, G01N 2138

Patent

active

039448347

ABSTRACT:
The embodiment of the pollution monitor described in the specification uses the principle of ultraviolet-induced fluorescence to detect and measure gaseous pollution in air, smokestack exhaust and other fluids. Improved calibration or standardization is effected by the use of one or more calibration cells in which a non-gaseous material simulates the fluorescence of the gaseous species under investigation, by scattering the incident ultraviolet light into a spectral region similar to that of the fluorescence of the gaseous species. Examples of suitable materials have been found to be aluminum, gold, platinum and molybdenum, all of which scatter light in the appropriate spectral region at a level which stays substantially constant with time.
In the preferred embodiment, the sample cell and the calibration cells are all formed in a single cell block by drilling holes into solid bar material which holes function as the individual cell cavities. The sample cell has ports for the flow of sample gas therethrough, while in each of the calibration cells, the metallic material is mounted to intercept and scatter the incident ultraviolet light energy. The cell block is constructed to rotate so that the several cells can be individually aligned in the light path between the ultraviolet source and fluorescence detector.

REFERENCES:
patent: 2974227 (1961-03-01), Fisher et al.
patent: 3409774 (1968-11-01), Dykeman
patent: 3795812 (1974-03-01), Okabe
patent: 3854050 (1974-12-01), Peterson et al.

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