Gas & Water Vapor Transmittance Measurement Device - Contracted Analysis: Device Details
Faster Measurement Using the MA Method
The MA method is characterized by the use of a support layer between the space connected to the water vapor/gas QMS and the measurement sample.
The support has the effect of delaying the flow of gas into the space on the QMS side, making it possible to prevent contamination of the space on the detector side when replacing samples.
As a result, a high degree of vacuum is always maintained in the space on the QMS side, making it possible to shorten time required for preprocessing or omit this step.
The sample chamber was opened to the atmosphere for approximately 90 seconds, then measured for approximately 24 hours. Atmospheric components (water, nitrogen, and oxygen) were not detected during measurement, which indicates that the QMS-side space maintained a clean environment.
There is also an example of measurement time reduced to 1/5 of conventional times in the measurement of barrier film with water vapor transmittance at a level of 104 g/m2/day.
Reduced damage to sample
A photograph of the sample after measurement is shown to the right.
As the support serves as a buffer, it is possible to reduce damage to the sample during measurement, which has been a problem of the conventional differential pressure method.
This measurement method using a support makes it possible to accurately measure thin and brittle samples, fragile samples, and samples that are otherwise difficult to handle.
Enabling SI traceability
QMS detectors can quantify various gases with a high level of sensitivity, but the sensitivity varies greatly depending on the type of gas. The usage history and environment of the detector can also affect the sensitivity, and as such, it must be calibrated regularly.
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