How much does a gravimeter cost?
The best gravimeters in use today are the size of a shopping basket, weigh a few kilograms, and cost around US $100,000, which limits their use.
What is unstable gravimeter?
Unstable (astatic) gravimeters Since the 1930s, unstable gravimeters have been used far more extensively than their stable counterparts. In a stable device, once the system has been disturbed it will return to its original position, whereas an unstable device will move further away from its original position.
Which of the following is an example of unstable gravimeter?
For example, if a pencil lying flat on a table is lifted at one end and then allowed to drop, the pencil will return to being flat on the table. However, if the pencil starts by being balanced on its end, once disturbed, it will fall over; i.e. it becomes unstable, rather than returning to its rest position.
What is Worden gravimeter?
A compact temperature-compensated gravity meter, in which a system is held in unstable equilibrium about an axis, so that an increase in the gravitational pull on a mass at the end of a weight arm causes a rotation opposed by a sensitive spring.
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.
How does gravimeter help in modern oil exploration?
gravimeter, also called gravity meter, sensitive device for measuring variations in the Earth’s gravitational field, useful in prospecting for oil and minerals. Gravimeters have been developed that can detect variations in the Earth’s gravitational field as small as one part in 10,000,000.
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.
What are the types of gravimeter?
There are two types of gravimeters: absolute and relative. Absolute gravimeters measure the local gravity in absolute units (Gal). Absolute gravimeters are compact (Autograv CG-5 model) and used in the field. They work by directly measuring the acceleration of a mass during freefall in a vacuum.
Who invented the gravimeter?
Lucien LaCoste (1908 – 1995) was a physicist and metrologist. He coinvented the modern gravimeter and invented the zero-length spring and vehicle-mounted gravimeters.
How do you use Worden gravimeter?
1) LEVEL THE GRAVIMETER: The gravimeter is placed on its tripod. The tripod must be leveled so that the bullseye level is centered. Center the two levels (longitudinal and transverse) using the knobs on each of the 3 legs. Both level bubbles must be absolutely centered.
What is gravity made of?
Earth’s gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body. That’s what gives you weight. And if you were on a planet with less mass than Earth, you would weigh less than you do here.
What is gravity number?
The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.