کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
737060 | 1461884 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Scaling of optimal pressure for a helium magnetometer with size has been modeled.
• A polarization rotator is found suitable for application in atomic magnetometers.
• A miniature isotropic helium-4 magnetometer has been realized.
• The sensitivity of the sensor reaches 10 pT/√Hz.
This paper reviews the progress made in the miniaturization of an isotropic space-qualified optically pumped magnetometer. Sensor isotropy is provided by a liquid crystal polarization rotator that sets the linear pumping beam polarization at 90° with respect to the ambient magnetic field. It allows a continuous polarization rotation from 0 to more than 300° with response times compatible with mobile or space applications. This rotator is nonmagnetic and can be easily integrated close to the gas cell. The miniature helium-4 sensor reaches a sensitivity of 10 pT/√Hz in a bandwidth from DC to 100 Hz.
Journal: Sensors and Actuators A: Physical - Volume 216, 1 September 2014, Pages 386–393