Device for measuring the permeability of a membrane to water vapor
US5390539A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/082
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.