Systems and methods for permeability rate testing of barrier films
US8729472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2011 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Aug 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/399
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention is directed to systems and methods which utilize a cavity ring-down spectroscopy (CRDS) technique implemented for the measurements of vapor transmission rate. In one embodiment, the vapor content to be measured is contained within an optical cavity. Light is then injected into the cavity up to a threshold level and the decay time of the injected light is measured. When the wavelength of the injected light is resonant with an absorption feature of the vapor the decay time increases linearly as a function of vapor content. In this manner, vapor content causes a longer decay time and thus the amount of vapor passing through the film (film permeation rate) can be determined in real-time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.