DZ – 03 TYPE QUARTH ZORIZONTAL PENDULUM
DOREL ZUGRAVESCU
Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest
The DZ – 03 type pendulum (fig.
1a – photo, fig. 1b – axonometric
view), the last one of the quartz titltmeter series realized by us, due to
the shape of its quartz supporting structure, has a greater stability and fiability,
a smaller size and weight than the DZ – 01 and DZ – 02 types and
is provided with the remote control for the fine adjustment of its drift. Its
drift and sensitivity are adjusted by differential screws assuring a particularly
fine mechanical adjustment of the DZ – 03 type pendulum
Resolution: 5x10
rad
Nonlinearity: < 1%
Fidelity (distorsion factor): < 1%
Size (mm): 305 x 305 x 370
Weight: 4 kg.
Key words: geodynamics, quartz titltmeters, geodynamics observatories, clinometric
Earth tide, crust deformation.
DZ – 03 TYPE HORIZONTAL PENDULUM EQUIPPED WITH CAPACITIVE TRANSDUCER
DOREL ZUGRAVESCU, R. DOROBANTU
Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest
The DZ – 03 type horizontal pendulum equipped with the capacitive transducer
realized by us (fig. 2a – photo, fig. 2b – axonometric view), a
mechanoelectrical transducer clinograph, is in fact a DZ – 03 type horizontal
pendulum with the quartz mobile mass replaced by a central armature of a capacitive
transducer. The exceptional amplification of the displacement provided by the
horizontal pendulum (105 times) is fructified allowing the capacitive transducer
to work without the electrical connection to the central armature.
Resolution: 5x10rad
Nonlinearity: < 1%
Fidelity (distorsion factor): < 1%.
Key words: geodynamics, quartz titltmeters, geodynamics observatory, clinometric
Earth tides, crust deformation, capacitive transducer, quartz horizontal pendulum.
PROGRAMMABLE GRAVIMETER CALIBRATION
DZ – BN TYPE SYSTEM
DOREL ZUGRAVESCU1, MANFRED BONATZ2
1Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest,
Romania
2Institut für Theoretische Geodäsie, Bonn Universität, West
Germany
Consisting on a three-pin tilt stand (A) (fig.
3a – photo, fig. 3b – axonometric
view) (A), an execution element (B), a displacement command element (C), the
DZ – BN type calibration, without taking the gravity sensor out of its
normal working regime. Both pieces of information concerning calibration and
time variations of gravity are analogically and/or digitally recorded.
Sinusoid period adjustable (15 min – 150 min)
Programmable starting between 12 hours and 7 days
Distorsion factor: < 1.5%
Drift: 10
g/month
Key words: geodynamics, gravimetric Earth tide, geodynamics observatory, gravity
variations, crust deformations, gravimeter calibration.
VERTICAL PENDULUM EQUIPPED WITH CAPACITIVE TRANSDUCER
DOREL ZUGRAVESCU1, R. DOROBANTU1, N. PUSCASU2, V. GHEMIGIAN1, S. ANGHEL3
1Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest
2Enterprise of Geological Surveys and Explorations "Oltenia", Craiova
3Enterprise of Geological and Geophysical Surveys, Bucharest
The vertical pendulum equipped with capacitive transducer realized by us
(fig. 4a – photo, fig. 4b – axonometric view) is in fact a quartz
vertical pendulum, having the same adjustment and screening as the DZ – 03
type horizontal pendulum.
The pendulum mass consists of the central armature of a capacitive transducer
with movable external armatures, a specially built pendular quartz suspension
allowing it only one degree of freedom.
Resolution: 5x10rad
Nonlinearity: 1%
Fidelity (distorsion factor): 1%.
Key words: geodynamics, tiltmeters, geodynamic observatory, crust deformation,
quartz vertical pendulum, capacitive transducer.
FERROFLUID CLINOGRAPH
R. DOROBANTU1, DOREL ZUGRAVESCU1, N. PUSCASU2, ILEANA FATULESCU1, D. DELION1
1Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest
2Enterprise of Geological Surveys and Exploration "Oltenia", Craiova
A ferrofluid clinograph realized (fig.
5a – photo, fig. 5b – axonometric
view) in fact a tilt transducer able to furnish the information concerning
the relative level variations of the ferrofluid located in two communicating
vessels, has been experimented in the frame of the laboratory of calibrating
and ageing geodynamical apparatus.
Analogical or digital information storage.
Sensitivity: 10 mV/sec for a signal/noise ratio 40 dB for length of 1 m order.
Key words: geodynamics, tiltmetry, geodynamics observatory, Earth tides, crust
deformation, ferrofluid clinograph.
DIGITAL THERMOGRAPH FOR HEAT FLOW MEASUREMENT ON THE BLACK SEA CONTINENTAL
SHELF*
R. DOROBANTU1, DOREL ZUGRAVESCU1, C. DEMETRESCU2, M. CARLOGANU3
1Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest
2Center for Earth Physics and Seismology, Natural Field Group, Bucharest – Magurele
3Enterprise for Peripheral Equipment, Bucharest
The digital thermograph (fig. 6) was realized by using the experience gained
in the construction on a thermistor-based thermograph meant to equip the geodynamic
observatories. The thermograph allows the recording of the fast temperature
variations, being suitable for heat flow determinations. It was used in real
conditions on the geodynamical survey ship "Moldova" with satisfactory
results.
Resolution: 0.5x10
°C
A minimum stand by time on a channel: 200 ms
Key words: geodynamcis, geophysical apparatus, Earth tide, crust deformation,
underground observatory, thermograph.
*Paper presented in extenso in Rev.roum.géol., géophys., géogr. – Géophysique,
t. 28, 1984.
RATE PULSE MODULATION THERMOGRAPH FOR REMOTE RECORDING
R. ROROBANTU1, DOREL ZUGRAVESCU1, L. MANEA2
1Center for Earth Physics and Seismology, Department of Geodynamics, Bucharest
2Enterprise of Geological and Geophysical Surveys, Bucharest
Digital signal transmission allows the realized thermograph to obtain unperturbated
records also for transmission lines of the order of the kilometer. Intended
to record the temperature variations in the geodynamics observatories, it may
also be used for the measurements of thermal gradient in bore holes (fig.
7).
Resolution: 5x10°C.
Key words: geodynamics, geophysical apparatus, Earth tides, crust deformation,
underground observatory, thermograph.
MAGNETOMETERS WITH MAGNETIC MODULAR MADE IN THE INSTITUTE OF PHYSICS AND
NUCLEAR ENGINEERING
M. I. CIOBANU
Institute for Physics and Nuclear Engineering, Bucharest
The main technical characteristics of the following magnetometers are presented:
– SGR 1, 2 and 3, used for spatial research in the 1978 – 1981 period
– SGR 6 and 7, designed to some spatial research to be made in the 1987 – 1990
period
– MPFZ –3, an instrument for applications in terrestrial geophysics.
Key words: fluxgate magnetometers, magnetic prospecting, space research.
X-RAY FLUORESCENCE ELEMENT ANALYSER (ARGUS)
CARAGHEORGHEOPOL GH., MAGUREANU C., RUSU AL., VUDCU E.,
BELINSCHI AL., POPA V., LAZAROVICI DOINA, FLORESCU AL, APOSTOLESCU S.,
MATEICIUC V., GORAN B., CATANESCU V., CAPRINI M., NICULESCU D.,
BOZDOG H., SOLOMON ST., PASCOVICI LAVINIA, CRISTEA I.
Institute for Physics and Nuclear Engineering, Bucharest
An X-ray fluorescence spectrometer (ARGUS) is described, designed to be used
for the elemental analysis of minerals and other solid/liquid samples. The
following points are discussed: basic principles, spectrometer structure, operation
and performances.
Key words: fluxgate magnetometers, magnetic prospecting, space research.
MULTIELEMENT X-RAY ANALYSER – MICRO X 250
A. STEFANESCU, M. PETCU, E. BADESCU, A. NICULESCU, S. SPIRIDON,
GH. CARAGHEORGHEOPOL, V. VALEANU, D. DUMITRU
Institute for Physics and Nuclear Engineering, Bucharest
Specifications:
– directly displays in percentages the elemental composition of the materials
by the X-ray method
– energetic range: 2.5 – 23 keV
– resolution: 1.5 keV for the 6.4 keV pick of 57Co radiation source
– memory: 256 addresses, each having 16 bits
– the acquired spectrum, can be displayed and printed.
Key words: fluxgate magnetometers, magnetic prospecting, space research.
ELECTRONIC EQUIPMENT FOR THE MARINE FLOOR SOIL PENETROMETER
H. BOZDOG1, M. I. CIOBANU1, S. C. MARCHIDAN1, V. VALEANU1,
M. ZAHARESCU1, T. SCHULTZ2,
G. WINTER3, S. BENEA4,
R. COMSA4, FL. ZAMFIRESCU4
1Institute for Physics and Nuclear Engineering, Bucharest
2Institute of Welding and Material Testing, Timisoara
3Institute of Physics and Material Technology, Bucharest
4Bureau of Expert Appraisement and Consulting, University of Bucharest
Block diagram and some constructional details of the transducer employed
in 8080 microprocessor controlled equipment for measuring, storing, displaying
and printing values of the penetration and friction forces (0 – 750 daN)
between the penetration rod and marine floor soil together with rod tip depths
(0 – 18 m) and various information on the undersea gear statute are presented.
Key words: fluxgate magnetometers, magnetic prospecting, space research.
PROTON MAGNETOMETERS MADE IN IFIN
O. ANGHELESCU
Institute for Physics and Nuclear Engineering, Bucharest
In 1970 – 1983, proton magnetometers have been made in the Institute
for Physics and Nuclear Engineering, in order to be used in Geology and Geophysics.
After realizing some laboratory models, the MPP – 73 magnetometer was
made, which enabled the modernization of the geomagnetic prospecting. In 1978
the MPP – 78 magnetometer was built, an up-to-date instrument. In 1970
the magnetometric installation IMPS – 01 was realized.
Key words: fluxgate magnetometers, magnetic prospecting, space research.
DIGITAL VELOCITY LOGGING EQUIPMENT D.S.C. – 2
V. VARODIN, V. NEGOESCU, H. POPESCU, S. POP
Enterprise of Geological and Geophysical Surveys, Bucharest
D.S.C. – 2 is a fully portable, digital seismic equipment for velocity
logging in shallow layers. D.S.C. – 2 is a low power compact system with
two channels and built-in blaster having a simple operation and accurate measuring.
Key words: seismic exploration, propagation velocity, velocity logging.
