A multi-channel atomic magnetometer operating in an unshielded environment is described and characterised. The magnetometer is based on D1 optical pumping and D2 polarimetry of Cs vapour contained in gas-buffered cells. Several technical implementations are described and discussed in detail. The demonstrated sensitivity of the setup is 100 fT/ √ Hz when operating in the difference mode.
We present encouraging results obtained with an experimental apparatus based on coherent population trapping\ud
and aimed at detecting a biological (cardiac) magnetic field in a magnetically compensated but unshielded\ud
volume. The work includes magnetic-field and magnetic-field-gradient compensation and uses differential detection\ud
to cancel common mode magnetic noise. Synchronous data acquisition with a reference (electrocardiographic\ud
or pulse-oximetric) signal makes possible improvement of the signal-to-noise ratio in off-line averaging.\ud
The setup has the significant advantages of working at room temperature with a small-size head, and the\ud
possibility of fast adjustments of the dc bias magnetic field, which makes the sensor suitable for detecting a\ud
biomagnetic signal at any orientation with respect to the axis of the head and in any position on the patient’s\ud
chest, which is not the case with other kinds of magnetometers
We present experimental data and theoretical interpretation of NMR spectra of remotely magnetized samples, detected in an unshielded environment by means of a differential atomic magnetometer. The measurements are performed in an ultra-low-field at an intermediate regime, where the J-coupling and the Zeeman energies have comparable values and produce rather complex line sets, which are satisfactorily interpreted.
An automated magnetometer suitable for long lasting measurement under stable and controllable experimental\ud
conditions has been implemented. The device is based on coherent population trapping (CPT) produced by\ud
a multifrequency excitation. CPT resonance is observed when a frequency comb, generated by diode laser current\ud
modulation, excites Cs atoms confined in a /42.521 cm3, 2 Torr N2 buffered cell. A fully optical\ud
sensor is connected through an optical fiber to the laser head allowing for truly remote sensing and minimization\ud
of the field perturbation. A detailed analysis of the CPT resonance parameters as a function of the optical\ud
detuning has been made in order to get high sensitivity measurements. The magnetic field monitoring\ud
performances and the best sensitivity obtained in a balanced differential configuration of the sensor are\ud
presented
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