A compact and versatile laser-interferometric displacement sensor for space applications

Kurzfassung

We present a high accuracy, high dynamic range interferometric displacement sensor for space applications. The readout scheme, based on laser frequency modulation, allows for a compact sensor design that enables sub-micron displacement measurements over a baseline of centimetres to metres. The technology will be applied within the SeRANIS mission, to be launched in 2026, where it will serve as a sensor to monitor and control the dynamics of a novel low thermal expansion structure. The sensor is designed to withstand the harsh LEO environment and is furthermore able to operate within a wide temperature range of more than ± 50°C around a nominal value of about 20°C, a novelty for interferometric sensors of this kind. In this presentation we will introduce the basic concept of the sensor, present its capabilities and highlight its wide range of applications.