| 摘要 |
A system for measuring the permeability of membranes, particularly with reference to water vapor, utilizing a diffusion cell having a first water vapor chamber and a second gas flow chamber, the chambers being separated by the membrane to be tested. Gas flow through the gas flow chamber is conveyed to an infrared gas analyzer and to a gas flow sensor; the infrared analyzer provides an electrical signal representative of the water vapor content of the gas, and the gas flow sensor provides a signal representative of the rate of gas flow through the system; the analyzer signal is conveyed to an amplifier and the gas flow sensor signal is utilized to adjust the gain of the amplifier, the output of the amplifier thereby presenting a water vapor signal which has been adjusted to compensate for air flow through the system.
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