30 July 1999 Laser 3He magnetometer for UGS applications
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Abstract
A miniature absolute magnetometer is being developed by Raytheon Systems Company (RSC) for military applications under the Miniature Unattended Sensor Technology program. RSC's advanced magnetometer utilizes a laser to optically pump and spin polarize 3He in a small glass cell subjected to an applied field of two gauss. The spin polarized 3He nuclei process about the ambient field at a frequency proportional to the magnitude of the field. Through a process of relaxation, the spin polarized 3He becomes depolarized in a time called T2. The precession generates a current in a pickup coil which is processed for a signal to detect, track and classify the passage of a mobile target. The magnetometer's unique characteristic of low noise at low frequencies makes the sensor well suited for detecting targets at long range.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charlie Hoke, Andrew Ochadlick, John Wynn, "Laser 3He magnetometer for UGS applications", Proc. SPIE 3713, Unattended Ground Sensor Technologies and Applications, (30 July 1999); doi: 10.1117/12.357143; https://doi.org/10.1117/12.357143
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