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→Acquisition and instrumentation
==Acquisition and instrumentation==
==Acquisition and instrumentation==
[[file:applying-gravity-in-petroleum-exploration_fig15-2.png|thumb|{{figure number|2}}]]
[[file:applying-gravity-in-petroleum-exploration_fig15-2.png|thumb|{{figure number|2}}Sensor consisting of a mass at the end of a spring.]]
Gravity can be collected on land, at sea, in the air, and by satellite. On land, sea, and air, most sensors consist of a mass at the end of a spring ([[:file:applying-gravity-in-petroleum-exploration_fig15-2.png|Figure 2]]). On land, the instrument is leveled and the mass is set to a null position for reading the spring tension.
Gravity can be collected on land, at sea, in the air, and by satellite. On land, sea, and air, most sensors consist of a mass at the end of a spring ([[:file:applying-gravity-in-petroleum-exploration_fig15-2.png|Figure 2]]). On land, the instrument is leveled and the mass is set to a null position for reading the spring tension.