Atomic magnetometers for health & security

在高偏置磁场中产生的磁共振信号中，生物磁学信号的频率范围从接近零到射频。就可测量信号而言，它们的范围从大约1 fT（大脑）到100 pT Hz-1/2（心脏）。NPL开发了一种原子磁强计的配置，可以在宽频率范围内以fT Hz-1/2的灵敏度测量磁场，而无需基于squid的商业系统所需的低温。总体目标是开发一种新颖的、具有商业吸引力的系统，用于在一些关键的、重要的临床应用中测量生物磁信号。工作的第一部分将包括矢量磁场测量方法的研究。第二部分将包括多渠道运营的探索。第三部分研究了提高传感器性能的量子增强技术。

Biomagnetic signals cover the frequency range from near zero to radio frequencies in the case of magnetic resonance signal induced in high bias fields. In terms of the measurable signals they range from about 1 fT (brain) to 100 pT Hz-1/2 (heart). NPL has developed a configuration of atomic magnetometer that enables measurements of the magnetic field with fT Hz-1/2 sensitivity over a wide frequency range without cryogenics required for commercial system based on SQUIDs. The overall aim is to develop a novel, commercially attractive, system for measuring biomagnetic signals in a number of key, clinically important, applications.The first part of the work will include studies of the methods for vector magnetic field measurement. The second part will encompass exploration of the multichannel operation. The third part involves studies of the quantum-enhanced techniques ofr improvement of sensor performance.