Yebes Technological Development Center
Services The Center for Technological Developments (CDT) is a branch of the National Geographic Institute of Spain. The new Gravimetry Laboratory hosts some of the most accurate state of the art gravimeters in the world. FG5 General Specifications Accuracy
2µGal
Precision
15µGal/sqrt(Hz) 1µGal
Repeatability Operating Temp. Range
+10º to +30ºC
Weight
320Kg
Power Requirements
500W
Gravimetry
A10 General Specifications Accuracy
10µGal
Precision
100µGal/sqrt(Hz) 10µGal
Repeatability Operating Temp.
-20º to +35ºC
Weight
105Kg
Power Requirements
300W
GWR-OSG General Specifications Sensibility Accuracy (1 hour measurement) Frequency range Drift
1nGal 5ngal O.1 Hz to Years < 6µgal/year
Yebes Technological Development Center Cerro de la Palera s/n 19141 - Yebes Guadalajara Spain Phone: (+34) 949290311 Fax: (+34) 949290063
Centro de Desarrollos Tecnológicos de Yebes Instituto Geográfico Nacional (Spain)
Phone: (+34) 949290311 Fax: (+34) 949290063 Email: jm.serna@oan.es
Gravimetry at the CDT
Gravimetry Laboratory
GWR-OSG Relative Gravimeter
Specially designed to host gravimeters. Given the delicacy of
In the SG sensor, levitation of a spherical test mass in an ultra-
these instruments and the high sensibility, it is necessary to have
stable magnetic field replaces the mechanical springs found in
control over the thermal behaviour of the building (double
previous relative gravity meters.
chamber with air conditioning system in the external one) and the structural behaviour (isolated concrete pillars).
OSG Gravity sensor unit
High precision continuous gravity monitoring for
geophysical
phenomena such as normal modes, mantle rheology, tides, solid
Gravimetry Applications • Geophysical research: Detection of vertical crustal motion, complementary verification of displacements measured with GPS and VLBI, determination of the geoid, volcanic magma flow monitoring, postglacial rebound studies, uplift of subduction studies, Earthquake research, long period tidal monitoring and modeling of earth anelasticity. • Environmental: Water table monitoring in deep and / or multiple aquifers, global sea level studies for global warming.
Earth-oceans-atmosphere
Gravimetry laboratory
interactions,
hydrology,
and
Earth
rotation.
FG5 Absolute Gravimeter A freely falling reflective test mass is dropped in a vacuum chamber. This causes optical fringes to be detected at the output of an interferometer. This signal is used to determine the local gravitational acceleration.
FG5, A10 working principle FG5
• Exploration and resource management: Oil and mineral exploration. • Inertial navigation: Gravity reference determinations, relative gravity network control points, establishing geodetic tie points for gravity networks, defining the geoid.
Gravity Acquisition and Processing Software “g” software
A10 Absolute Gravimeter
FG5
The A-10 is an absolute gravimeter optimized for fast data acquisition, ease of use, and portability in outdoor applications. The instrument allows true field operation in harsh conditions on open outdoor sites in the sun, snow, and wind. OSG
“UIPC” software A10