Gravimeter pdf

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Worden Gravimeter. 2015.ph.641.1: A cylindrical, metallic, reflective instrument stands on three legs that can be adjusted for height. The body has a metal manufacturer's label. A black, plastic rim covers the top and upper edges of the instrument. The top of the object has several components including a dial labelled from 0-9, a viewing port This gravimeter isn't used anymore. It was relatively big & heavy with the sensitivity about 0.25 mgal. The most famous unstable gravimeter is the " Lacoste-Romberg" gravimeter. The most significant point of it: using a very sensitive spring which is named: 'zero-length spring'. FG5-X Absolute Gravimeter The FG5-X absolute gravimeter is the latest version of the high precision, high accuracy, transportable instrument that measures the vertical acceleration of gravity. The operation of the FG5-X is simple in concept: A test mass is dropped vertically by a mechanical device inside a vacuum chamber, and then LAB 1: Using the Gravimeter and Measuring the Free-Air Effect Due Tue, January 26 The purpose of this lab is to learn the proper use of our gravimeters, to get a feel for their accuracy, and to make our own estimate of the effects of elevation on gravity measurements. We will use two different gravimeters: the LaCoste & Romberg G93 and G1096. Abstract and Figures The superconducting gravimeter is a spring type gravimeter in which the mechanical spring is replaced by a magnetic levitation of a superconducting sphere in the field of introduce a superconducting gravimeter into the project. The budget, however, was restricted to use for rental equipment. We introduced a new type of metal spring sensor gravity meter gPhone gravimeter instead of a superconducting gravimeter. In 2010FY we used three gPhone's at the geothermal field for two months. Marine gravimetry came to existence as a standard gravimetric technique some 50 years ago, even though the first attempts were made even earlier, in the 1920s and 1930s, on board submarines (Vening-Meinesz, 1932).It was clear from the beginning that marine measurements could not compete with land measurements in terms of precision. At sea, the gravimeter is subjected to the accelerations of Cold atom gravimeter is in principle also a Mach-Zehnderinterferometer,butwithmatterwavesinsteadof laser light. The test masses are cold atoms in gas phase and beam splitting and mirror reflection is achieved with a properRaman laser light pulse. Wewill discuss its ba-sicprinciplesinthenextfewsections. Thisinterferometer USE OF THE WORDEN GRAVIMETER: 1) LEVEL THE GRAVIMETER: The gravimeter must be placed upon a level surface. If you use the meter on its tripod, the tripod must be leveled so that the bullseye level is centered. Place the gravity meter on the tripod or other level surface and level the Consequently, problems of hysteresis appear in the spring which originate variations in the sensibility of the instrument. We present a modification of the instrument of an Askania GS-15 gravimeter, into a zero instrument, without anay interference in the fundamental parts of the gravimeter. The modified gravimeter has been working for more 2. The FG5 absolute gravimeter 2.1 Principle of operation The principle of the ballistic FG5 AG is to observe the free-falling of a rep