KEYWORDS: Magnetism, Magnetometers, Modulation, Absorption, Sensors, Magnetic sensors, Chemical species, Signal detection, Control systems, Light sources
The magnetometer which is based on the coherence population trapping theory, works by exciting atoms with two modulated coherent light fields and obtaining magnetic resonance signals containing magnetic field intensity information. In view of the problem of measuring blind area in this scheme, the direction characteristics of CPT resonance signal are analyzed. A dark state coupling measurement scheme based on two groups of modulated light fields is proposed. The system performance based on this scheme is verified by the all-optical sensing experiment system. Experimental results show that the resonance signal with higher signal to noise ratio could be obtained by using the dark state coupling measurement technology. This effectively eliminates the blind area of the CPT magnetometer and avoids losing lock of system. As a result, sufficient system stability performance could be obtained in omnidirectional measurement of magnetic field.
KEYWORDS: Vertical cavity surface emitting lasers, Magnetometers, Control systems design, Magnetism, Absorption, Control systems, Magnetic sensors, Sensors, Laser stabilization, Feedback control
Magnetic field detection is an important means of deep space environment exploration. Benefit from simple structure
and low power consumption, atomic interference magnetometer become one of the most potential detector payloads.
Vertical Cavity Surface Emitting Laser (VCSEL) is usually used as a light source in atomic interference magnetometer
and its frequency stability directly affects the stability and sensitivity of magnetometer. In this paper, closed-loop control
strategy of VCSEL was designed and analysis, the controller parameters were selected and the feedback error algorithm
was optimized as well. According to the results of experiments that were performed on the hardware-in-the-loop
simulation platform, the designed closed-loop control system is reasonable and it is able to effectively improve the laser
frequency stability during the actual work of the magnetometer.
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