Flow contamination tester

Details Flow contamination tester Flow contamination tester

1996-12-23

1998-08-04

Pham, Hoa Q.

Optics: measuring and testing

For size of particles

356336, 356338, G01N 2153

Patent

active

057902496

ABSTRACT:
Apparatus for measuring contamination in a hot melt flow. The apparatus includes a flow cell tube adapted to pass the melt flow. Apparatus is provided for directing laser energy through the tube and the melt flow passing through the flow cell tube to a laser energy detector producing an electrical signal representative of the size of a contaminant in the flow melt. A heater is provided for heating the melt flow as such melt flow passes through the flow cell tube. The apparatus is adapted to measure contamination in a hot melt where the temperature of the melt must be maintained as the melt passes through the flow tube. The flow tube, laser, detector and heater are disposed within a housing. The housing has a cooling chamber. The detector is disposed in the cooling chamber to thermally isolate the detector from the heating of the flow.

REFERENCES:
patent: 4177482 (1979-12-01), Henry
patent: 4509360 (1985-04-01), Erwin et al.
patent: 4529306 (1985-07-01), Kilham et al.
patent: 4910403 (1990-03-01), Kilham et al.
patent: 5231463 (1993-07-01), Shambaugh
patent: 5433112 (1995-07-01), Piche et al.
patent: 5442437 (1995-08-01), Davidson

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