TY - JOUR
T1 - Coupled Dark State Magnetometer for the China Seismo-Electromagnetic Satellite
AU - Pollinger, Andreas
AU - Lammegger, Roland
AU - Magnes, Werner
AU - Hagen, Christian
AU - Ellmeier, Michaela
AU - Jernej, Irmgard
AU - Leichtfried, Mario
AU - Kürbisch, Christoph
AU - Maierhofer, Rupert
AU - Wallner, Robert
AU - Fremuth, Gerhard
AU - Amtmann, Christoph
AU - Betzler, Alexander
AU - Delva, Magda
AU - Prattes, Gustav
AU - Baumjohann, Wolfgang
PY - 2018/8/6
Y1 - 2018/8/6
N2 - The Coupled Dark State Magnetometer (CDSM) is an optically pumped scalar magnetometer, which is based on two-photon spectroscopy of free alkali atoms. This paper introduces the measurement principle, instrument design, required resources and key performance characteristics of the flight model for the China Seismo-Electromagnetic Satellite, which is the first demonstration of the CDSM measurement principle in space. The CDSM uses several Coherent Population Trapping (CPT) resonances in parallel in order to reduce systematic errors, e.g. the sensor temperature dependence. Overall five control loops were identified to enable a reliable operation. As known so far CPT is the only effect in optical magnetometry which inherently enables omni-directional, dead zone free measurements. This leads to a simple all-optical sensor design without double cell units, excitation coils or electromechanical parts. The instrument is characterized by an accuracy of 0.19 nT (σ), a detection noise of 50 pTrms at 1 s integration time, a mass of 1672 g and an in Earth orbit measured power consumption of 3394 mW.
AB - The Coupled Dark State Magnetometer (CDSM) is an optically pumped scalar magnetometer, which is based on two-photon spectroscopy of free alkali atoms. This paper introduces the measurement principle, instrument design, required resources and key performance characteristics of the flight model for the China Seismo-Electromagnetic Satellite, which is the first demonstration of the CDSM measurement principle in space. The CDSM uses several Coherent Population Trapping (CPT) resonances in parallel in order to reduce systematic errors, e.g. the sensor temperature dependence. Overall five control loops were identified to enable a reliable operation. As known so far CPT is the only effect in optical magnetometry which inherently enables omni-directional, dead zone free measurements. This leads to a simple all-optical sensor design without double cell units, excitation coils or electromechanical parts. The instrument is characterized by an accuracy of 0.19 nT (σ), a detection noise of 50 pTrms at 1 s integration time, a mass of 1672 g and an in Earth orbit measured power consumption of 3394 mW.
U2 - 10.1088/1361-6501/aacde4
DO - 10.1088/1361-6501/aacde4
M3 - Article
SN - 1361-6501
JO - Measurement Science and Technology
JF - Measurement Science and Technology
ER -