Method for testing carbonation loss from beverage bottles using IR spectroscopy
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United States of America Patent
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Dec 5, 1995
Grant Date -
N/A
app pub date -
Jun 21, 1994
filing date -
Jun 21, 1994
priority date (Note) -
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Abstract
A method for measuring carbonation loss in beverage bottles and predicting shelf-life thereof utilizes infrared (IR) absorption spectroscopy. The concentration of CO.sub.2 gas in a bottle being tested is measured with an infrared beam according to Beer's Law. In one embodiment the CO.sub.2 gas measured is in the headspace of a test bottle partially filled with carbonated water. The walls of the bottle are clamped in a fixture to maintain the bottle diameter substantially constant. An IR beam is transmitted through the bottle just below the fixture, and absorption values of the beam are measured. Shelf-life is calculated from the absorption values. In another embodiment the test bottle is filled with compressed CO.sub.2 gas generated by dry ice placed in the bottle.
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