What is LaCoste Romberg?

LaCoste Romberg LLC In 1965 LaCoste Romberg introduced the world’s first dynamically stabilized platform gravity meter called the S-meter system. These meters revolutionized the geophysics world by making it possible, for the first time, to take highly accurate gravity measurements from a moving ship or aircraft.

How accurate are gravimeters?

Precise relative gravimeters achieve the internal precision about a few μGal 1, even in field conditions. Nevertheless this precision is in fact concerned with the instant of measurement and can not be confused with the accuracy of the gravity at the gravity station, which is influenced by other effects.

What does a gravimeter measure?

The gravimeter measures the shape of seawater-filled cavities at the edge of some major fast-moving glaciers. Data about the amount of water under ice fills in a crucial gap in knowledge related to calving and melting of glaciers.

What is the main principle involved in a gravimeter?

“Gravimeter” is the measuring instrument of gravitational field of the Earth at specific location. The instrument works on the principle of measuring the constant downward acceleration of gravity.

What is LaCoste Gravimeter?

The Model “G” Gravimeter is able to collect the highest accuracy of gravity readings obtainable due to the patented Zero Length Springdesign. The repeatability of the meter is 0.1 milligal and accuracy is better than . 04 milligal. The instrument is used for measuring variation in gravitational attraction.

How does the LaCoste Romberg gravimeter work?

Spring Gravimeter (LaCoste-Romberg Gravimeter) This spring uses a linearized stress-strain curve around the origin; the length of the spring is directly proportional to the external force. The acceleration of gravity, g is measured at the equilibrium state.

What is a stable gravimeter?

An instrument that uses a high order of optical and/or mechanical magnification so that an extremely small change in the position of a weight or associated property can be accurately measured.

How sensitivity of unstable gravimeter is increased in comparison to stable type?

Stable-type meters provide gravity readings which are linear over relatively wide ranges of scale reading. Unstable meters are usually nonlinear but generally have higher sensitivities. The sensitivity of an unstable gravimeter can be increased by lengthening its natural period of oscillation.

What is the sensitivity of gravimeter?

The superconducting gravimeter achieves sensitivities of 10–11 m·s−2 (one nanogal), approximately one trillionth (10−12) of the Earth surface gravity.

Who invented Gravimeter?

Lucien LaCoste
Lucien LaCoste (1908 – 1995) was a physicist and metrologist. He coinvented the modern gravimeter and invented the zero-length spring and vehicle-mounted gravimeters.

What is unstable Gravimeter?

Measurement of gravity We will use a Lacoste and Romberg “unstable” gravimeter. It has a horizontal pendulum with a test mass pulling down and a “zero-length” spring holding it up. Holding it in place requires a balance of torques that is achieved with one setting of the spring.

What is a zero length spring?

A zero-length spring has no extension corresponding to zero initial force. This spring uses a linearized stress-strain curve around the origin; the length of the spring is directly proportional to the external force. The acceleration of gravity, g is measured at the equilibrium state.