Flight Model of
the Coupled Dark State Magnetometer for the China
Pollinger2,1, Roland Lammegger2, Werner Magnes1, Christian Hagen1,
Michaela Ellmeier1,2, Irmgard Jernej1, Mario Leichtfried1, Christoph
Kürbisch1, Rupert Maierhofer2, Robert Wallner1, Gerhard Fremuth1,
Christoph Amtmann2, Alexander Betzler2, Magda Delva1, Gustav Prattes1
and Wolfgang Baumjohann1
1. Space Research Institute, Austrian Academy of
Sciences, Schmiedlstraße 6, 8042 Graz, Austria 2. Institute of
Experimental Physics, Graz University of Technology, Petersgasse 16,
8010 Graz, Austria
The Coupled Dark
State Magnetometer (CDSM) is a scalar magnetometer based on two-photon
spectroscopy of free alkali atoms. Coherent Population Trapping (CPT)
leads to narrow optical resonance features, which enable a precise
determination of the magnetic field-dependent Zeeman energy level
shifts. Systematic errors, which usually degrade the accuracy of
single CPT magnetometers, are cancelled or at least minimized by the
use of several CPT resonances in parallel. CPT inherently allows
omni-directional measurements. This leads to a moderately complex,
all-optical sensor design without double cell units, excitation coils
or electro-mechanical parts.
The measurement principle was discovered in 2008  and since then
the instrument has been developed by the two institutes involved for
future space missions [2, 3]. The first demonstration in space takes
place aboard the China Seismo-Electromagnetic Satellite (CSES)
mission, which was launched into a low Earth orbit in February 2018.
Furthermore, the CDSM is baseline instrument for the JUpiter ICy moons
Explorer (JUICE) mission of the European Space Agecy (ESA) to visit
the Jovian system.
The presentation includes an introduction of the measurement
principle, the instrument design for the CSES mission, performance
characteristics and first in-flight results.
 Roland Lammegger, Method and device for measuring magnetic fields,
WIPO, Patent WO/2008/151344 (2008).
 Andreas Pollinger, Michaela Ellmeier, Werner Magnes, Christian
Hagen, Wolfgang Baumjohann, Erich Leitgeb, Roland Lammegger, Enable
the inherent omni-directionality of an absolute coupled dark state
magnetometer for e.g. scientific space applications, IEEE
Instrumentation and Measurement Technology Conference (I2MTC)
Proceedings, 33 (2012).
 Andreas Pollinger, Development and Evaluation of a Control Unit
for the Coupled Dark State Magnetometer, PhD Thesis, Graz University
of Technology (2013).