Permeameter with wide measurement range
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Jan 22, 1999
filing date -
Jan 22, 1998
priority date (Note) -
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Abstract
The permeameter embodying the invention comprises, on the one hand, a measuring head comprising two chambers opening onto two sides of the test piece, one of these chambers being connected to a measuring circuit successively comprising at least one flow meter and a pumping means capable of generating pressure or a partial vacuum in the circuit, an adjusting means being provided to maintain the circuit at a given pressure, and, on the other hand, an electronic circuit comprising plural calibrated amplifiers of which the inputs are connected to the output of the flow meter and of which the outputs are connected to the inputs of a multiplexer whose output is connected to a processor via an analog-to-digital converter. The invention applies notably to the measurement of air permeability of cigarette paper.
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