5:15 PM - 7:15 PM
[PCG20-P08] Development of Onboard Vacuum Pump That Requires No Continuous Power Supply and Has a Negligible Volume
Keywords:vacuum pump, getter, For onboard satellite applications, absorption of moisture
Researchers in space physics must consider not only the development of science instruments but also how to ensure their performances in space. Since it takes many years from their manufacturing to the start of observations in space, it is essential to devise mechanisms to maintain its performance; otherwise, meaningful results cannot be obtained. One such mechanism is vacuum sealing.
For example, if certain components must avoid exposure to Earth's atmosphere and should only be exposed for the first time in space, they are placed in a vacuum-sealed container, which is opened once outside the atmosphere. However, outgassing from the inner walls of the container can increase the internal pressure, potentially degrading the performances before observations begin. This exemplifies why maintaining performance is as crucial as developing the instrument itself in order to achieve optimal results.
In recent years, we have developed a power-free pump using zirconium. While it functions as ground support equipment (GSE), it has not yet been suitable for onboard deployment due to limitations in shock resistance, repeatability, volume, and weight. In this study, we have developed a palladium/titanium thin film capable of absorbing residual atmospheric gases inside the instrument and maintaining a high vacuum (approximately 10E-2 Pa) until the instrument reaches space. By coating the inner surfaces of components such as bellows with this film, it can function as an atmospheric absorption pump with nearly zero volume and a weight of only a few dozen grams.
This technology not only prevents instrument degradation but also reduces the complexity of satellite integration testing, ultimately contributing to lower overall satellite development costs.
For example, if certain components must avoid exposure to Earth's atmosphere and should only be exposed for the first time in space, they are placed in a vacuum-sealed container, which is opened once outside the atmosphere. However, outgassing from the inner walls of the container can increase the internal pressure, potentially degrading the performances before observations begin. This exemplifies why maintaining performance is as crucial as developing the instrument itself in order to achieve optimal results.
In recent years, we have developed a power-free pump using zirconium. While it functions as ground support equipment (GSE), it has not yet been suitable for onboard deployment due to limitations in shock resistance, repeatability, volume, and weight. In this study, we have developed a palladium/titanium thin film capable of absorbing residual atmospheric gases inside the instrument and maintaining a high vacuum (approximately 10E-2 Pa) until the instrument reaches space. By coating the inner surfaces of components such as bellows with this film, it can function as an atmospheric absorption pump with nearly zero volume and a weight of only a few dozen grams.
This technology not only prevents instrument degradation but also reduces the complexity of satellite integration testing, ultimately contributing to lower overall satellite development costs.