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Contents 6.4

Contents 6.4 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 6.4.1 Static Measurement . . . . . . . . . . . . . . . . . . . . . . . . . 51 6.4.2 Dynamic Measurement . . . . . . . . . . . . . . . . . . . . . . . 51 7 Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 7.1 Control Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 7.1.1 Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 7.1.2 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.1.3 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 7.2 Control Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 8 Conclusions, Status and Open Work . . . . . . . . . . . . . . . . . . . 58 APPENDIX A Deviation of the Logarithmic Decrement . . . . . . . . . . . . . . . . . 61 B MSTS DM Design Drawing . . . . . . . . . . . . . . . . . . . . . . . . . 63 C MSTS DM Breadboard Electronics Circuit Diagram . . . . . . . . . 65 List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 x

Chapter 1 Introduction 1.1 BepiColombo Mission 1.1.1 About the Mission BepiColombo 1 , an ESA mission in cooperation with Japan, will explore Mercury, the planet closest to the Sun. Europe’s space scientists have identified the mission as one of the most challenging long-term planetary projects, because Mercury’s proximity to the Sun makes it difficult for a spacecraft to reach and survive in the harsh environment. The scientific interest to go to Mercury lies in the valuable clues that such a mission can provide in understanding the planet itself as well as the formation of our Solar System—clues which cannot be obtained with distant observations from Earth. Only NASA’s Mariner 10 and MESSENGER have visited Mercury so far. Mariner 10 provided the first-ever close-up images of the planet when it flew past three times in 1974 - 1975. En route to its final destination in orbit around Mercury in 2011, MESSENGER flew past the planet on January the 14 th , 2008, providing new data and images. The information gleaned, when BepiColombo arrives in 2019, will throw light not only on the composition and history of Mercury, but also on the history and formation of the inner planets in general, including the Earth. The mission will consist of two separate spacecrafts that will orbit the planet. ESA is building one of the main spacecraft, the Mercury Planetary Orbiter (MPO) and the 1 Named after Giuseppe Colombo (October 2, 1920 - February 20, 1984), Italian scientist, mathematician and engineer. He is best known for his orbit calculations on planet Mercury. 1

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