High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force

G.A. Cranch, Gordon M.H. Flockhart, C.K. Kirkendall

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

A low-frequency magnetic field sensor, based on a current-carrying beam driven by the Lorentzian force, is described. The amplitude of the oscillation is measured by a distributed-feedback fiber laser strain sensor attached to the beam. The transduction mechanism of the sensor is derived analytically using conventional beam theory, which is shown to accurately predict the responsivity of a prototype sensor. Excellent linearity and negligible hysteresis are demonstrated. Noise sources in the fiber laser strain sensor are described and thermo-mechanical noise in the transducer is estimated. The prototype sensor achieves a magnetic field resolution of 5 nT Hz for 25 mA of current, which is shown to be close to the predicted thermo-mechanical noise limit of the sensor. The current is supplied optically through a separate optical fiber yielding an electrically passive sensor head.
LanguageEnglish
Article number034023
Number of pages12
JournalMeasurement Science and Technology
Volume20
Issue number3
DOIs
Publication statusPublished - Mar 2009

Fingerprint

Distributed Feedback Lasers
Distributed feedback lasers
distributed feedback lasers
Fiber Laser
Magnetometers
Fiber lasers
magnetometers
fiber lasers
High Resolution
Sensor
high resolution
sensors
Sensors
Strain Sensor
Magnetic Field
Prototype
Responsivity
prototypes
Magnetic fields
Hysteresis

Keywords

  • beam characteristics
  • intensity
  • spatial pattern formation
  • dynamical laser instabilities
  • noisy laser behavior
  • fiber lasers
  • magnetometers
  • magnetic field measurements

Cite this

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abstract = "A low-frequency magnetic field sensor, based on a current-carrying beam driven by the Lorentzian force, is described. The amplitude of the oscillation is measured by a distributed-feedback fiber laser strain sensor attached to the beam. The transduction mechanism of the sensor is derived analytically using conventional beam theory, which is shown to accurately predict the responsivity of a prototype sensor. Excellent linearity and negligible hysteresis are demonstrated. Noise sources in the fiber laser strain sensor are described and thermo-mechanical noise in the transducer is estimated. The prototype sensor achieves a magnetic field resolution of 5 nT Hz for 25 mA of current, which is shown to be close to the predicted thermo-mechanical noise limit of the sensor. The current is supplied optically through a separate optical fiber yielding an electrically passive sensor head.",
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High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force. / Cranch, G.A.; Flockhart, Gordon M.H.; Kirkendall, C.K.

In: Measurement Science and Technology, Vol. 20, No. 3, 034023, 03.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force

AU - Cranch, G.A.

AU - Flockhart, Gordon M.H.

AU - Kirkendall, C.K.

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AB - A low-frequency magnetic field sensor, based on a current-carrying beam driven by the Lorentzian force, is described. The amplitude of the oscillation is measured by a distributed-feedback fiber laser strain sensor attached to the beam. The transduction mechanism of the sensor is derived analytically using conventional beam theory, which is shown to accurately predict the responsivity of a prototype sensor. Excellent linearity and negligible hysteresis are demonstrated. Noise sources in the fiber laser strain sensor are described and thermo-mechanical noise in the transducer is estimated. The prototype sensor achieves a magnetic field resolution of 5 nT Hz for 25 mA of current, which is shown to be close to the predicted thermo-mechanical noise limit of the sensor. The current is supplied optically through a separate optical fiber yielding an electrically passive sensor head.

KW - beam characteristics

KW - intensity

KW - spatial pattern formation

KW - dynamical laser instabilities

KW - noisy laser behavior

KW - fiber lasers

KW - magnetometers

KW - magnetic field measurements

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