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Calibration of the lift-off technique for measuring the internal pressure of fumed silica VIPs and determination of boundary conditions for the lift-off measurements and processing of measurement raw data

Commissioned to: Forschungsinstitut für Wärmeschutz e.V. (FIW), München, Germany and Hanita Coatings, Kibbutz Hanita, Israel
Timeframe: May 2016 to April 2017
Description of the project: The foil lift-off technique is the most commonly used method to determine the internal pressure of VIPs during and after the production process. It is used for more than a decade now without any evidence or comparison to a direct and calibrated measurement method. Besides, boundary conditions for the measurement of the internal pressure according to the lift-off technique are not fixed in a standard or in scientific articles. The purpose of this project is to:
  1. calibrate the readings of the lift-off units against calibrated pressure gauges;
  2. fix the boundary conditions for the measurement;
  3. describe a reliable procedure for deriving pressure results from the obtained measurement raw data (assessment and algorithm);
  4. cross-check the results with fast methods, such as the Va-Q-Check device.