Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Fred J. Klopping"'
Publikováno v:
Metrologia. 50:1-8
The gravitational attraction of the body of a gravity meter upon its own proof mass is sometimes called the self-attraction. The self-attraction is a source of systematic error for absolute measurements of g, the acceleration of an object due to Eart
Autor:
Brian Ellis, Fred J. Klopping, Timothy M. Niebauer, Bryon Mason, Ryan M. Billson, Derek van Westrum
Publikováno v:
Metrologia. 48:154-163
This paper discusses simultaneous gravity and vertical gravity gradient measurements obtained with a newly designed recoil-compensated dropping chamber adapted to an FG5 absolute gravimeter. The new dropping chamber incorporates counterweights to com
Autor:
John F. Ferguson, Fred J. Klopping, Jennifer L. Hare, Tianyou Chen, John E. Seibert, Jerry L. Brady
Publikováno v:
GEOPHYSICS. 73:WA163-WA171
The 4D microgravity method is becoming a mature technology. A project to develop practical measurement and interpretation techniques was conducted at Prudhoe Bay, Alaska, from 1994 through 2002. Beginning in 2003 these techniques have been systematic
Autor:
John E. Seibert, Jerry L. Brady, John F. Ferguson, Tianyou Chen, Jennifer L. Hare, Timothy M. Niebauer, Fred J. Klopping
Publikováno v:
SPE Reservoir Evaluation & Engineering. 11:824-831
Summary The world's first 4D surface-gravity surveillance of a1 waterflood has been implemented at Prudhoe Bay, Alaska. This monitoring technique is an essential component of the surveillance program for the Gas Cap Water Injection (GCWI) project. A
Autor:
Daniel Aliod, D. Van Westrum, Timothy M. Niebauer, Ethan H. Mann, Jeffrey D. MacQueen, Fred J. Klopping, C. Nind
Publikováno v:
ASEG Extended Abstracts. 2007:1-6
Gravity meters are commonly used to map spatial changes in the earth?s gravity, achieving resolution of parts per billion on microgravity surveys. The application of gravity surveys to monitor change and recent improvements in gravity instrumentation
Autor:
Thomas S. James, J. Liard, N. Courtier, Fred J. Klopping, Anthony Lambert, Glenn S. Sasagawa, D. Winester
Publikováno v:
Geophysical Research Letters. 28:2109-2112
Repeated absolute gravity measurements have been made over a period of several years at six sites along a 3000 km-long, mid-continental, North American profile from the coast of Hudson Bay southward to Iowa. With the exception of the southern-most si
Publikováno v:
Geophysical Research Letters. 27:33-36
We introduce the concept of absolute differential gravimetry using fiber optic-based laser interferometry. Absolute differential gravimetry provides an instantaneous determination of the difference in gravity between two or more points on or beneath
Calibration of a superconducting gravimeter by comparison with an absolute gravimeter FG5 in Boulder
Publikováno v:
Geophysical Research Letters. 25:1075-1078
This paper reports the results of a calibration of a superconducting gravimeter using simultaneous measurements of Earth tides with an absolute gravimeter. Nine consecutive days of observations were made with both the C024 superconducting gravimeter
Publikováno v:
Physics of the Earth and Planetary Interiors. 91:131-148
The cryogenic gravimeter was developed to overcome the mechanical deficiencies of spring gravimeters. The stability of the instrument permits the study of long-term gravity variations for the first time. Short-term, especially periodical gravity vari
Publikováno v:
Geophysical Research Letters. 22:461-464
The FG5 series absolute gravimeters have an estimated instrumental accuracy of 1–2 µGal (1-2 × 10−8 ms−2). A number of instrument comparisons were conducted with six FG5 instruments over a period of 9 months; the predecessor series JILA4 inst