Un sistema automatico per la misura di tre componenti del campo geomagnetico utilizzante un magnetometro a precessione nucleare
Main Article Content
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
DE SANTIS, A., MELONI, A., PALANGIO, P. and TACCETTI, Q. (1981) “Un sistema automatico per la misura di tre componenti del campo geomagnetico utilizzante un magnetometro a precessione nucleare”, Annals of Geophysics, 34(1), pp. 83–114. doi: 10.4401/ag-4688.
Issue
Section
OLD
Open-Access License
No Permission Required
Istituto Nazionale di Geofisica e Vulcanologia applies the Creative Commons Attribution License (CCAL) to all works we publish.
Under the CCAL, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, so long as the original authors and source are cited. No permission is required from the authors or the publishers.
In most cases, appropriate attribution can be provided by simply citing the original article.
If the item you plan to reuse is not part of a published article (e.g., a featured issue image), then please indicate the originator of the work, and the volume, issue, and date of the journal in which the item appeared. For any reuse or redistribution of a work, you must also make clear the license terms under which the work was published.
This broad license was developed to facilitate open access to, and free use of, original works of all types. Applying this standard license to your own work will ensure your right to make your work freely and openly available. For queries about the license, please contact ann.geophys@ingv.it.