Narrow Line Rubidium Magnetometer for High Accuracy Field Measurements

Allen, J. H.; Bender, P. L.

doi:10.5636/jgg.24.105

Cited by 29 publications

(9 citation statements)

References 27 publications

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“…In contrast, the M x -OPQM generates a group of unresolved lines in the vicinity of the center of gravity and produces large systematic errors. Both parts of the first tandem magnetometer [141] were filled with 87 Rb vapor. The choice of 87 Rb was far from optimal because the magnetic resonance spectrum of this isotope contains a group of lines, the distance between which in EMS at a minimal number of perturbations was only severalfold greater than their width.…”

Section: Z àMmentioning

confidence: 99%

Modern radio-optical methods in quantum magnetometry

Aleksandrov

Vershovskiĭ

2009

Phys.-Usp.

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This paper is an extension of a part of the talk delivered under the more general title``Narrow spectral lines in fundamental metrology: state of the art, prospects, and problems'' at the session of the 90th anniversary of Physics± Uspekhi. The talk reviewed past developments and the current status of the metrology of length, frequency/time, and magnetic fields. The measurement of these quantities currently relies on the high stability of energies of standard transitions between metastable atomic states. Because of space restrictions in the journal, all metrology topics other than the title one were omitted in the present review.

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Section: Z àMmentioning

confidence: 99%

Modern radio-optical methods in quantum magnetometry

Aleksandrov

Vershovskiĭ

2009

Phys.-Usp.

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“…While component or vector instruments would be most desirable for such purposes, the only instruments of sufficient stability and accuracy which have been available are total field magnetometers, particularly the proton precession magnetometer and the rubidium narrow line magnetometer (NLM) initially described by Allen and Bender [1972]. The NLM was used by Brill as the basic instrument for differential measurements over a 12-km base line near Denver, Colorado, and his initial results showed that short-term background fluctuations were reduced by about a factor of 40 over a single sensor and the residual short-term difference field was consistent with a model based on induction effects in a local conductivity anomaly.…”

Section: Introductionmentioning

confidence: 99%

Geomagnetic field gradient measurements and noise reduction techniques in Colorado

Beahn¹

1976

J. Geophys. Res.

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Two rubidium narrow line magnetometers were operated in a differe, ntial mode along a 12-km base line near Boulder, Colorado, and the total field gradient measured to high accuracy. A number of runs of difference field were made from March through September of 1974. The results showed that daily averages were generally constant to within +0.1 • during quiet or disturbed periods with the exception of a few days in late August and early September. The agreement is eXCellent between the observed difference field and a difference field calculated from the measured east-west field Y and a transfer function appropriate to a local conductivity anomaly. Accounting for the effect of the anomaly typically permits a reduction of a factor of 3 in the standard deviation of the daily average; on very disturbed days a reduction of a factor of 5 in gradiometer noise was achieved. For periods of more than several days the corrections for anomaly edge effects are comparatively small.

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“…The first tandem M x -M z was suggested and realized by A. H. Allen and P. L. Bender [6]. The idea was to combine a fast M x -OPM with a slow and accurate M z -OPM based on separated resonance lines to correct the frequency of the self-oscillator.…”

Section: Tandem-type Magnetometersmentioning

confidence: 99%

Recent Progress in Optically Pumped Magnetometers

Alexandrov

2003

Physica Scripta

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Optically pumped magnetometres (OPM) are known as the most precise instruments for scalar measurement of low magnetic fields, including those of the Earth's magnetic field. For a long time OPM could not compete, in absolute accuracy, with the proton precession magnetometers, being, at the same time, much more sensitive and fast. Nowadays, due to the considerable progress in the OPM performance, several types of OPM became much more accurate than the best proton magnetometer. During the last decade the main progress was associated with OPM of the following three types: (1) The narrow-line potassium M x -OMP with the highest shot-noise-limited resolution (about 10 fT=Hz 1=2 ) and with an absolute accuracy better than 0.1 nT; (2) The ''tandem'' M x -M z -type magnetometer with a narrow line potassium M z unit of enhanced absolute accuracy (of about 10 pT); (3) The laser pumped 3 He freeprecession magnetometer of highest absolute accuracy and lowest energy consumption. Each of these three types has its own specific features, preferable in certain applications.

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Narrow Line Rubidium Magnetometer for High Accuracy Field Measurements

Cited by 29 publications

References 27 publications

Modern radio-optical methods in quantum magnetometry

Modern radio-optical methods in quantum magnetometry

Geomagnetic field gradient measurements and noise reduction techniques in Colorado

Recent Progress in Optically Pumped Magnetometers

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