Phone: (+34) 949290311 Fax: (+34) 949290063

Cerro de la Palera s/n 19141 - Yebes Guadalajara Spain

Phone: (+34) 949290311 Fax: (+34) 949290063 Email: jm.serna@oan.es

Gravimetry

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.

Services Yebes Technological Development Center

Centro de Desarrollos Tecnológicos de Yebes

Instituto Geográfico Nacional (Spain)

Yebes Technological Development Center

Accuracy 2µGal

Precision 15µGal/sqrt(Hz)

Repeatability 1µGal

Operating Temp. Range +10º to +30ºC

Weight 320Kg

FG5 General Specifications

Power Requirements 500W

GWR-OSG General Specifications

Sensibility 1nGal

Accuracy (1 hour measurement) 5ngal

Frequency range O.1 Hz to Years

Drift < 6µgal/year

Accuracy 10µGal

Precision 100µGal/sqrt(Hz)

Repeatability 10µGal

Operating Temp. -20º to +35ºC

Weight 105Kg

A10 General Specifications

Power Requirements 300W

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.

• 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.

Gravimetry at the CDTGravimetry at the CDTGravimetry at the CDTGravimetry at the CDT Gravimetry Laboratory

Specially designed to host gravimeters. Given the delicacy of

these instruments and the high sensibility, it is necessary to have

control over the thermal behaviour of the building (double

chamber with air conditioning system in the external one) and the

structural behaviour (isolated concrete pillars).

FG5 Absolute Gravimeter

A freely falling reflective test mass is dropped in a vacuum cham-

ber. This causes optical fringes to be detected at the output of an

interferometer. This signal is used to determine the local gravita-

tional acceleration.

A10 Absolute Gravimeter

OSG GravityOSG GravityOSG GravityOSG Gravity

sensor unitsensor unitsensor unitsensor unit

Gravimetry laboratoryGravimetry laboratoryGravimetry laboratoryGravimetry laboratory

GWR-OSG Relative Gravimeter

In the SG sensor, levitation of a spherical test mass in an ultra-

stable magnetic field replaces the mechanical springs found in

previous relative gravity meters.

High precision continuous gravity monitoring for geophysical

phenomena such as normal modes, mantle rheology, tides, solid

Earth-oceans-atmosphere interactions, hydrology, and Earth

rotation.

Gravity Acquisition and Processing Software

“g” software“g” software“g” software“g” software

FG5 FG5 FG5 FG5

“UIPC” software“UIPC” software“UIPC” software“UIPC” software

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.

FG5, A10 working principleFG5, A10 working principleFG5, A10 working principleFG5, A10 working principle

A10A10A10A10

FG5FG5FG5FG5

OSGOSGOSGOSG