Additively Manufactured, Multi-Langmuir Probe Plasma Sensing Device for Use on CubeSats

Abstract

This thesis presents a Langmuir probe (LP) sensor array for CubeSat ionospheric plasma diagnostics. The ionosphere is a critical layer of Earth's atmosphere consisting entirely of plasma, and reliable in-situ measurements made on satellites orbiting within the ionosphere are necessary for better understanding its properties. LPs are an ideal choice for CubeSats due to their simplicity, versatility, and minimal maintenance requirements.

This thesis focuses on the development and characterization of a novel LP sensor array that employs three types of LP arrangements (single, dual, and triple) to measure plasma properties. This includes the development of low-power electronics to run the multi-LP device and the design of 3D-printed housing to push the lower bounds of device size and electrode spacing. The designs were rigorously tested in a helicon plasma chamber.

The resulting LP sensor array is the first of its kind, allowing for the development of better and cheaper CubeSat sensors. The multi-LP device is designed to draw low power and is intended to be cost-effectively manufactured via rapid prototyping techniques. This makes it an ideal solution for CubeSats that is compatible with in-space manufacturing. This device provides critical data to help us better understand the thermosphere's plasma and its impact on climate change.