Rapid evaluation of thin-film barrier coatings on thick substrat

Details Rapid evaluation of thin-film barrier coatings on thick substrat Rapid evaluation of thin-film barrier coatings on thick substrat

1997-11-21

2000-09-12

Larkin, Daniel S.

Measuring and testing

With fluid pressure

Leakage

73 38, G01N 1508

Patent

active

061160814

ABSTRACT:
The present invention is directed to an apparatus for measuring gas permeation through test articles, such as evacuated tubes used for blood sample collection. The apparatus includes first and second sealable chambers, with the collection tube being placed in the first chamber. The apparatus is pressurized, and both chambers are sealed such that each chamber has an identical pressure and isolated from the other chamber. Permeation of gas into the collection tube located in the first chamber is detected as a differential pressure change relative to the second chamber. This change in pressure is recorded and is indicative of the rate of gas transport into the collection tube.

REFERENCES:
patent: 3921436 (1975-11-01), Plegat
patent: 4670847 (1987-06-01), Furuse
patent: 4675834 (1987-06-01), Furuse
patent: 4686638 (1987-08-01), Furuse
patent: 4811252 (1989-03-01), Furuse
patent: 5600996 (1997-02-01), Witschi

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