Absolute gravimetric measurement device by atomic interferometry for geophysical applications particularly for monitoring hydrocarbon reservoirs

Abstract

The invention relates to a device comprising a laser system (13) for generating a plurality of laser bands. The frequency of each of the bands is consistent and equal to an energetic transition between a hyperfine level (Fl, F2) of a fundamental state (52Si / 2) and a hyperfine level (F'2,F'3) of an excited state (52P3 / 2) of the plurality of atoms, wherein the laser system (13) comprises a first laser source (23) which is stabilized in frequency and emits a first band (30), and a second laser source (24) which is connected in phase with the first laser source (23) and emits a repumping band (37); the first laser source (23) and the second laser source (24) are coupled with a device (29) for generating secondary bands; and the device (29) for generating the secondary bands is capable of generating a detection band (31), a band for producing a three-dimensional magneto-optical trap (32), a thrust band (33) and a reference band (36). The laser system (13) also comprises a device (39) for generating Raman bands. The device (39) for generating the Raman bands is capable of producing two exiting superimposed Raman interferometric bands (41) from the reference band (36). The device for generating the Raman bands (39) is associated with a device (40) for generating cooling bands. The device (40) for generating the cooling bands is additionally coupled with the repumping band (37) and is capable of generating three bands (53) for obtaining the magneto-optical trap.

Description

technical field [0001] The present invention relates to an absolute gravimetric measurement device based on atomic interferometry particularly suitable for field applications and advantageously for use in geophysical fields. Background technique [0002] Thanks to the measurement of the temporal variation of the acceleration of gravity, gravimetry is today successfully used not only in oil exploration, but also in the study of phenomena related to the field of geomechanics, hydrology and geodynamic evolution. [0003] In fact, it is known that the Earth's gravitational field varies with time and space. [0004] More specifically, this force field is also dependent on the considered site, since it depends on latitude, longitude and composition of the subsoil and is time-varying as it is influenced by various phenomena. Among these, it is worth mentioning: geodynamic or tectonic phenomena, gravitational forces exerted by celestial bodies of the solar system, gravitational for...

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Problems solved by technology

[0051] However, all vibration damping systems known today have dimensions such that they cannot be integrated into the absolute gravimetric measuring device according to the invention with low burden

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