Flight Model of

the Coupled Dark State Magnetometer for the China

Seismo-Electromagnetic Satellite


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 [1] 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.



[1] Roland Lammegger, Method and device for measuring magnetic fields,

WIPO, Patent WO/2008/151344 (2008).

[2] 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).

[3] Andreas Pollinger, Development and Evaluation of a Control Unit

for the Coupled Dark State Magnetometer, PhD Thesis, Graz University

of Technology (2013).