Absolute gravimeter helium immersion experiment
Operating an FG-5 absolute gravimeter in a helium atmosphere should reduce the noise that is caused by vibrations of the air-vacuum interface where the interferometer laser beam enters and leaves the vacuum dropping chamber. The helium atmosphere will decrease the change in refractivity across the i...
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| Veröffentlicht in: | Journal of geodesy 2003-03, Vol.76 (11-12), p.684-689 |
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| container_end_page | 689 |
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| container_issue | 11-12 |
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| container_title | Journal of geodesy |
| container_volume | 76 |
| creator | Robertson, D. S. Courtier, N. Winester, D. |
| description | Operating an FG-5 absolute gravimeter in a helium atmosphere should reduce the noise that is caused by vibrations of the air-vacuum interface where the interferometer laser beam enters and leaves the vacuum dropping chamber. The helium atmosphere will decrease the change in refractivity across the interface by up to 88% over the value in air, depending on the purity of the helium. A marked reduction in the post-fit residuals is observed at frequencies of about 50 Hz and little or no effect at higher frequencies. A qualitative explanation of the frequency cutoff in terms of motion of air under compression is developed. Further experiments to measure and characterize the effects of the vibrations are planned.[PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1007/s00190-002-0295-0 |
| format | Article |
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| fulltext | fulltext |
| identifier | ISSN: 0949-7714 |
| ispartof | Journal of geodesy, 2003-03, Vol.76 (11-12), p.684-689 |
| issn | 0949-7714 1432-1394 |
| language | eng |
| recordid | cdi_proquest_journals_722532332 |
| source | SpringerNature Journals |
| subjects | Atmosphere Geodetics Gravity Helium Refractivity |
| title | Absolute gravimeter helium immersion experiment |
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