Fluid opacity sensor

Details Fluid opacity sensor Fluid opacity sensor

1990-06-11

1993-04-27

Evans, F. L.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356435, 356440, G01N 2100

Patent

active

052067114

ABSTRACT:
A fiber optic fluid opacity sensor includes a light source (12) transmitting light to dividing means (14) for providing a sample light signal (18) and a reference light signal (20) to dual photodetectors (26, 28). Sample and reference optical pathways (19, 21) are defined by optical fibers (18, 20) spaced apart from and axially aligned with the photodetectors (26, 28) at a predetermined distance. Signal processing means (30) takes the log ratio output of the signals from the photodetectors (26, 28) for cancelling the effect of light source drift since the same source (12) is common to both for measuring the light transmission and determining opacity therefrom. A sample probe (40) contains the photodetectors (26, 28) and the sample and reference optical pathways (19, 21). The light source (12) and the signal processing means (30) are situated outside of the probe (40) and by virtue thereof outside of the sample process line (48).

REFERENCES:
patent: 3972625 (1976-08-01), Takahasi et al.
patent: 4637729 (1987-01-01), Schoch
patent: 4851665 (1989-07-01), Presavento et al.
patent: 4860586 (1989-08-01), Miers et al.
patent: 4917491 (1990-04-01), Ring et al.
patent: 4989942 (1991-02-01), Koenigsberg et al.

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