Apparatus for determining the stability of foam

Details Apparatus for determining the stability of foam Apparatus for determining the stability of foam

1985-04-30

1987-06-30

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73 601, 356436, G01N 2100

Patent

active

046773045

ABSTRACT:
Apparatus for determining the stability of a foam comprising a light source (1), a foam sample cell (2), a light sensitive cell (3) having a linear output voltage- or current-exposed area relationship, a voltmeter or ammeter (9) connected to the light sensitive cell (3) and a device (11) responsive to the output from the voltmeter for integrating a voltage-time curve or a current-time curve directly and dividing this area by the difference in voltage or current between that observed in the absence of foam and that observed immediately after foam has been formed to give the average foam lifetime. The light source (1), the foam sample cell (2) and the light sensitive cell (3) are positioned in line and are enclosed in a light-tight box (4).

REFERENCES:
patent: 3454759 (1969-07-01), Calhoun
patent: 3915570 (1975-10-01), Skala
patent: 4061016 (1977-12-01), Noel et al.
patent: 4084426 (1978-04-01), Gales
J. Phys. Chem. 59 pp. 863-866 (1955), Ross, S. et al., "The Transmission of Light by Stahle Foams".
Ross, S. et al., "The Transmission of Light by Stable Foams".

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