Double-resonance magnetometry in arbitrarily oriented fields

Research output: Contribution to conferenceSpeech

Abstract

Our magnetometry development is focussed on compact, portable sensors for geophysical field measurements. In order to develop practical sensors with minimised size and power requirements, single-beam double-resonance magnetometry is used, avoiding any requirement for extensive optical hardware or full-field compensation. Magnetic resonance in atomic polarisation is detected using a polarimeter to measure optical rotation in transmitted pump light, allowing rejection of common-mode optical noise. The application of this technique to unshielded geophysical field measurements requires detailed understanding of systematic effects arising in arbitrary orientations of the static field B0.

We report the development and calibration of a test system for double resonance measurements in generated static fields of well-controlled magnitude and orientation, including systems for automated B0 control and software generated modulation/demodulation [1]. The sensitivity of these devices depends on signal amplitude, phase and RF broadening, all of which vary with B0 orientation. By working in a low-field, weak-pumping regime, we obtain experimental measurements of anisotropy in these parameters, in agreement with theoretically derived distributions [2]. We comment on the importance of measurement mode and signal demodulation in optimising double-resonance sensitivity and bandwidth, and the suitability of these techniques for compact, portable magnetometers.
This work is supported by the UK Quantum Technology Hub in Sensors and Metrology [3].

Conference

ConferenceWorkshop on Optically Pumped Magnetometers 2017
Abbreviated titleWOPM 2017
CountrySwitzerland
CityFribourg
Period21/08/1722/08/17

Fingerprint

magnetic measurement
demodulation
sensors
requirements
hubs
sensitivity
polarimeters
rejection
magnetometers
metrology
magnetic resonance
hardware
pumping
pumps
bandwidth
computer programs
modulation
anisotropy
polarization

Keywords

  • magnetometry
  • Photonics
  • atomic polarisation

Cite this

@conference{ed493743934b4a278b505610c09e72ac,
title = "Double-resonance magnetometry in arbitrarily oriented fields",
abstract = "Our magnetometry development is focussed on compact, portable sensors for geophysical field measurements. In order to develop practical sensors with minimised size and power requirements, single-beam double-resonance magnetometry is used, avoiding any requirement for extensive optical hardware or full-field compensation. Magnetic resonance in atomic polarisation is detected using a polarimeter to measure optical rotation in transmitted pump light, allowing rejection of common-mode optical noise. The application of this technique to unshielded geophysical field measurements requires detailed understanding of systematic effects arising in arbitrary orientations of the static field B0.We report the development and calibration of a test system for double resonance measurements in generated static fields of well-controlled magnitude and orientation, including systems for automated B0 control and software generated modulation/demodulation [1]. The sensitivity of these devices depends on signal amplitude, phase and RF broadening, all of which vary with B0 orientation. By working in a low-field, weak-pumping regime, we obtain experimental measurements of anisotropy in these parameters, in agreement with theoretically derived distributions [2]. We comment on the importance of measurement mode and signal demodulation in optimising double-resonance sensitivity and bandwidth, and the suitability of these techniques for compact, portable magnetometers.This work is supported by the UK Quantum Technology Hub in Sensors and Metrology [3].",
keywords = "magnetometry, Photonics, atomic polarisation",
author = "Stuart Ingleby and Erling Riis and Aidan Arnold and Paul Griffin and Carolyn O'Dwyer and Iain Chalmers",
year = "2017",
month = "8",
day = "21",
language = "English",
note = "Workshop on Optically Pumped Magnetometers 2017, WOPM 2017 ; Conference date: 21-08-2017 Through 22-08-2017",

}

Ingleby, S, Riis, E, Arnold, A, Griffin, P, O'Dwyer, C & Chalmers, I 2017, 'Double-resonance magnetometry in arbitrarily oriented fields' Workshop on Optically Pumped Magnetometers 2017, Fribourg, Switzerland, 21/08/17 - 22/08/17, .

Double-resonance magnetometry in arbitrarily oriented fields. / Ingleby, Stuart; Riis, Erling; Arnold, Aidan; Griffin, Paul; O'Dwyer, Carolyn; Chalmers, Iain.

2017. Workshop on Optically Pumped Magnetometers 2017, Fribourg, Switzerland.

Research output: Contribution to conferenceSpeech

TY - CONF

T1 - Double-resonance magnetometry in arbitrarily oriented fields

AU - Ingleby, Stuart

AU - Riis, Erling

AU - Arnold, Aidan

AU - Griffin, Paul

AU - O'Dwyer, Carolyn

AU - Chalmers, Iain

PY - 2017/8/21

Y1 - 2017/8/21

N2 - Our magnetometry development is focussed on compact, portable sensors for geophysical field measurements. In order to develop practical sensors with minimised size and power requirements, single-beam double-resonance magnetometry is used, avoiding any requirement for extensive optical hardware or full-field compensation. Magnetic resonance in atomic polarisation is detected using a polarimeter to measure optical rotation in transmitted pump light, allowing rejection of common-mode optical noise. The application of this technique to unshielded geophysical field measurements requires detailed understanding of systematic effects arising in arbitrary orientations of the static field B0.We report the development and calibration of a test system for double resonance measurements in generated static fields of well-controlled magnitude and orientation, including systems for automated B0 control and software generated modulation/demodulation [1]. The sensitivity of these devices depends on signal amplitude, phase and RF broadening, all of which vary with B0 orientation. By working in a low-field, weak-pumping regime, we obtain experimental measurements of anisotropy in these parameters, in agreement with theoretically derived distributions [2]. We comment on the importance of measurement mode and signal demodulation in optimising double-resonance sensitivity and bandwidth, and the suitability of these techniques for compact, portable magnetometers.This work is supported by the UK Quantum Technology Hub in Sensors and Metrology [3].

AB - Our magnetometry development is focussed on compact, portable sensors for geophysical field measurements. In order to develop practical sensors with minimised size and power requirements, single-beam double-resonance magnetometry is used, avoiding any requirement for extensive optical hardware or full-field compensation. Magnetic resonance in atomic polarisation is detected using a polarimeter to measure optical rotation in transmitted pump light, allowing rejection of common-mode optical noise. The application of this technique to unshielded geophysical field measurements requires detailed understanding of systematic effects arising in arbitrary orientations of the static field B0.We report the development and calibration of a test system for double resonance measurements in generated static fields of well-controlled magnitude and orientation, including systems for automated B0 control and software generated modulation/demodulation [1]. The sensitivity of these devices depends on signal amplitude, phase and RF broadening, all of which vary with B0 orientation. By working in a low-field, weak-pumping regime, we obtain experimental measurements of anisotropy in these parameters, in agreement with theoretically derived distributions [2]. We comment on the importance of measurement mode and signal demodulation in optimising double-resonance sensitivity and bandwidth, and the suitability of these techniques for compact, portable magnetometers.This work is supported by the UK Quantum Technology Hub in Sensors and Metrology [3].

KW - magnetometry

KW - Photonics

KW - atomic polarisation

M3 - Speech

ER -

Ingleby S, Riis E, Arnold A, Griffin P, O'Dwyer C, Chalmers I. Double-resonance magnetometry in arbitrarily oriented fields. 2017. Workshop on Optically Pumped Magnetometers 2017, Fribourg, Switzerland.