Seal Test, Fine & Gross Leak
The purpose of the seal test is to determine the effectiveness of the sealing of components with internal cavities, i.e. to determine their hermeticity. Defective sealing may permit the entrance of contaminants, thus reducing the effective life and reliability of devices.
There are two hermeticity testing techniques: fine leak and gross leak tests.
Fine leak is performed using suitable pressure and vacuum chambers and a mass-spectrometer-type leak detector calibrated for helium. Samples are placed in a sealed chamber pressurized with pure helium. The pressure and test condition are decided depending on the volume of the device cavity. The samples are then analyzed by the leak detector for presence of helium, which would be an indication of the existence of a leak.
- Gross leak. The sample is dipped in low density freon liquid and after that immersed in a higher density high temperature freon bath. If the hermeticity of the sample is not adequate, low density freon enters the sample, and consequently escapes as the sample is immersed in the second bath. The test results are photographed.
Head of the Scanning Acoustic Microscopy Service.
Degree in Physics and Ph.D. in Materials Science by the University of Seville.
Since 2007 Dr Aparicio has developed a productive research career within the field of Materials Science including post-doctoral stays at the University of Trento, the University of Mons, and the Spanish National Research Council (CSIC). His researches have been published in more than 30 articles in reputed international research journals and conferences (> 70) including more than 10 invited talks and lectures.
Within the frame of the programme “Torres Quevedo” for the Knowledge Transfer and the incorporation of research talent into the industry, in 2019 he joined Alter Technology as Senior Materials Science Test Engineer. In 2019 he was appointed to lead the Scanning Acoustic Microscopy Service. Within this framework, he currently collaborates in different ESA projects (JUICE and PLATO).”
- Scanning Acoustic Microscopy on Ceramic Capacitors - 18th May 2020
- Non-destructive detection of micrometric internal features within EEE microelectronic systems. - 3rd September 2019
- Acoustic Inspection of Hybrid Systems on Laminated Substrates - 3rd September 2019
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