Concept information
Preferred term
LRGM
Definition
- The gravity response system consists of a weight on the end of a horizontal beam supported by a zero-length spring (a zero-length spring is defined as one in which the tension is proportiona1 to the actual length of the spring, that is, if all external forces were removed the spring would collapse to zero length). The gravity meter can detect very small changes in gravity by measuring the restoring force necessary to bring the horizontal beam to a reference position. It is important to note that the instrument does not measure the total force of gravity, only changes in gravity. The accuracy of the instrument is about .01 mgal, perhaps .005 if great care is exercised. The temperature inside the instrument is carefully controlled by a heater and thermostat, because changes in temperature affect the physical properties of the spring. [Summary provided by the University of Colorado] (en)
Broader concept
- Gravimeters (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/2725b06e-67c5-44ed-bfad-95c4b772cf1d
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