Un sistema automatico per la misura di tre componenti del campo geomagnetico utilizzante un magnetometro a precessione nucleare
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Abstract
Recording in digital form from the start is almost a necessary step in
Geomagnetic Observatories; we propose in this paper a simple method
based on the use of a proton precession magnetometer equipped with two
Helmholtz coils. A small microprocessor has been used to transform
the signal frequency measured by the electronic counter to obtain the
components absolute values and to automatize the set of measures.
A sophisticated equipment for the current generation and control was
necessary to maintain the current flowing in the Helmoholtz coils within
2 [iA for successive measurements. To maximize the signal coming from
the sensor inside the coils, for the different components, a simple arrangement
of two ortogonal small coils in only one sensor has been made.
The system proposed can furnish a very good stability and accuracy
(~ 1.5 riT) in the measured components (H, D, Z) and could avoid the
absolute measurements.
The time sampling for the complete set of components is ~ 20 sec;
the instrument can be used then to obtain informations of the geomagnetic
variations with period T > 1 min. The Observatory use is
suggested for an automatic hourly means computation.
Geomagnetic Observatories; we propose in this paper a simple method
based on the use of a proton precession magnetometer equipped with two
Helmholtz coils. A small microprocessor has been used to transform
the signal frequency measured by the electronic counter to obtain the
components absolute values and to automatize the set of measures.
A sophisticated equipment for the current generation and control was
necessary to maintain the current flowing in the Helmoholtz coils within
2 [iA for successive measurements. To maximize the signal coming from
the sensor inside the coils, for the different components, a simple arrangement
of two ortogonal small coils in only one sensor has been made.
The system proposed can furnish a very good stability and accuracy
(~ 1.5 riT) in the measured components (H, D, Z) and could avoid the
absolute measurements.
The time sampling for the complete set of components is ~ 20 sec;
the instrument can be used then to obtain informations of the geomagnetic
variations with period T > 1 min. The Observatory use is
suggested for an automatic hourly means computation.
Article Details
How to Cite
1.
DE SANTIS A, MELONI A, PALANGIO P, TACCETTI Q. Un sistema automatico per la misura di tre componenti del campo geomagnetico utilizzante un magnetometro a precessione nucleare. Ann. Geophys. [Internet]. 1981Nov.25 [cited 2022Jul.5];34(1):83-114. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4688
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