Publication Date:
1983-01-01
Description:
At the Istanbul workshop we described an MT-System for remote reference measurements which at that time was partly in the manufacturing phase. The system has now been completed and gone through a process of thorough testing with the elimination of a number of faults. Presently it will be tested in the field for the third time. In this paper we should like to describe the system in its present state and the changes made. As shown in the block diagram (Fig. 1), the system consists of two complete 5-component digital recording systems, each built in its own truck. The first (or central) system has successfully served since 1974 as a single station (loseckeet. al., 1978, 1979). The computer system has now been enlarged in order to allow, during acquisition of new data, processing of measured data from both stations. The second (or satellite) station is in principle designed according to the same concept as the first station. This concerns mainly the analog part of the system. However, the flux gate sensors for the long period magnetic fields were replaced by an induction coil system, and the short period limit of the second system was changed from 5 Hz to 250 Hz. Both systems now include more precise 15 bit — ADC’s and synchronizable high precision clocks necessary for remote reference measurements. The small computer of the second station serves as a controller that mainly organizes the scanning and data transfer to the magnetic tape. One consequence of the functional tests was the installation of temperature measurements within the magnetometers in order to take into account a number of temperature effects. This feature is not included in the block diagram. The following pictures give an impression of the systems. Figure 2 shows the working place of the measurement operator in the first system. It includes an 8-channel recorder, the analog electronics with 2 E-channels, 3 induction coil channels and 3 flux gate channels and the teletype for measurement control and protocol. The synchronizable clock is not shown in this figure. Figure 3 shows the working place of the operator involved in data processing, including the computer, video terminal, disc and magnetic tape. In Fig. © 1983, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
Print ISSN:
0022-1392
Topics:
Geosciences
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