Apparatus for measuring the transmittance or opacity of a gaseou

Details Apparatus for measuring the transmittance or opacity of a gaseou Apparatus for measuring the transmittance or opacity of a gaseou

1976-03-02

1977-04-12

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250575, 340237S, 356207, G01N 2126

Patent

active

040171930

ABSTRACT:
The apparatus has spaced light sources and light sensors on opposite walls of a conduit positioned to provide a pair of equal shorter path lengths and a pair of equal longer path lengths for narrow collimated beams between the sources and sensors. Each sensor is exposed to beams from the sources alternately during measuring periods. Computing means computes the quotient of the products of the sensor outputs corresponding to light transmitted over the longer and shorter paths, and an output is produced from the quotient corresponding to the transmittance or opacity over a predetermined distance of smoke, etc. Test means are provided to monitor the operation continually. Beam splitters for the sources, and disks having transparent and mirror sectors for the sensors, are described. Mirror sectors of different reflectivity operate during measuring and test periods. Windows are employed at the sources and sensors and the apparatus largely compensates for dirt build-up on the windows, and variations in the sources and sensors. Specific features to promote accuracy are described.

REFERENCES:
patent: 3652850 (1972-03-01), Briggs
patent: 3973852 (1976-08-01), Moore et al.
patent: 3976891 (1976-08-01), Parkinson

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