6. Special measures: wells, seabed
Gravity meters can be adapted for specific uses. For example, some gravimeters have been modified for use suspended from a cable, placed on the seabed from a surface vessel or landed on the Earth's surface from a helicopter. Others have been adapted to be handled by a submersible such as the Nautile. This requires the instrument to be installed in a watertight housing capable of withstanding water pressure and/or shock, and to be self-levelling.
These are known as seabed gravimeters. These are always relative spring-loaded instruments. However, the Scripps Institution of Oceanography in San Diego, California, has developed a prototype absolute instrument that can be installed on the seabed.
Similarly, spring-loaded relative gravimeters have been adapted for installation in borehole logging probes. These are well gravimeters. They enable...
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Special measures: wells, seabed
Measurements from space
Bibliography
References
Theses
Standardization
Association française de normalisation AFNOR http://www.afnor.fr
- Valeur de la pesanteur terrestre - NF X02-011 - 11-1974
Organizations
Bureau gravimétrique international (BGI) http://www.bgi.cnes.fr:8110
Bureau de recherches géologiques et minières (BRGM) http://infoterre.brgm.fr
Manufacturers
Scintrex http://www.scintrexltd.com
Lacoste & Romberg http://www.lacosteromberg.com
Micro-G Solutions http://www.microgsolutions.com
...
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