Testing electronic components and systems under hydrostatic pressure
Hakonen, Kalle (2021)
Hakonen, Kalle
2021
Automaatiotekniikan DI-ohjelma - Master's Programme in Automation Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Hyväksymispäivämäärä
2021-04-13
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202102122069
https://urn.fi/URN:NBN:fi:tuni-202102122069
Tiivistelmä
The study aimed to find how the single-board computer can be used in computing as a part of a gigabit network under hydrostatic pressure of 50 MPa . The single-board computer was tested as a whole system, and it was interpreted to work when communication between computers was
successful. For evaluation, the study includes designing the hydrostatic test system capable of 70 MPa pressure. Additionally, a pressure hull penetrator, based on a printed circuit board instead of separate wires, was designed for gigabit ethernet.
The study includes pressure tests to define the behavior of a Secure Digital (SD) memory card, which resulted in tolerating a pressure up to 70 MPa . The discovery simplified subsequent tests as the SD card’s possible malfunction could be ensured separately from the system. Quartz crystal as a part of an oscillator circuit is a mandatory component in almost all networking applications, and it was also expected to be the first to fail under pressure. During the study, these quartz crystals are first examined as a part of the microcontroller circuit and later with the computer itself.
Finally, the quartz crystals are successfully protected in the system using two different methods. These methods improved the tolerance for short-term exposure, and as a consequence, the system successfully executes the networking and computing. The results show the correct operation of the single-board computer under the hydrostatic pressure of 50 MPa .
successful. For evaluation, the study includes designing the hydrostatic test system capable of 70 MPa pressure. Additionally, a pressure hull penetrator, based on a printed circuit board instead of separate wires, was designed for gigabit ethernet.
The study includes pressure tests to define the behavior of a Secure Digital (SD) memory card, which resulted in tolerating a pressure up to 70 MPa . The discovery simplified subsequent tests as the SD card’s possible malfunction could be ensured separately from the system. Quartz crystal as a part of an oscillator circuit is a mandatory component in almost all networking applications, and it was also expected to be the first to fail under pressure. During the study, these quartz crystals are first examined as a part of the microcontroller circuit and later with the computer itself.
Finally, the quartz crystals are successfully protected in the system using two different methods. These methods improved the tolerance for short-term exposure, and as a consequence, the system successfully executes the networking and computing. The results show the correct operation of the single-board computer under the hydrostatic pressure of 50 MPa .