SE7904269L - SET AND DEVICE FOR SATURATION OF GRAVITY GRADIENTS - Google Patents
SET AND DEVICE FOR SATURATION OF GRAVITY GRADIENTSInfo
- Publication number
- SE7904269L SE7904269L SE7904269A SE7904269A SE7904269L SE 7904269 L SE7904269 L SE 7904269L SE 7904269 A SE7904269 A SE 7904269A SE 7904269 A SE7904269 A SE 7904269A SE 7904269 L SE7904269 L SE 7904269L
- Authority
- SE
- Sweden
- Prior art keywords
- laser
- gravity
- masses
- circular polarization
- modulator elements
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
A gravity gradiometer includes a ring laser cavity 4, 6, 8, 10, two modulator elements 12, 22 in the path of the laser beam produced by laser tube 2, and spaced masses 18, 28 attached to the modulator elements to provide a differential modulation of circular polarization modes proportional to the difference in gravity at the location of the two masses. In one form, a biasing element 42 is added to shift the operating point of the laser system to improve performance by preventing phase locking; the bias may be checked by a second ring laser using the same cavity with a second laser tube 50. Beat frequencies indicative of the polarization modes are measured by photodetectors 40, 52, the initial circular polarization being established by a magnet 20 near the laser tubes. Because of the differential measurement, the apparatus can be used when moving, e.g. in a borehole, without being affected by acceleration. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US91097278A | 1978-05-30 | 1978-05-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE7904269L true SE7904269L (en) | 1979-12-01 |
Family
ID=25429590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7904269A SE7904269L (en) | 1978-05-30 | 1979-05-15 | SET AND DEVICE FOR SATURATION OF GRAVITY GRADIENTS |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS54156686A (en) |
| CA (1) | CA1115544A (en) |
| DE (1) | DE2921788A1 (en) |
| FR (1) | FR2427619A1 (en) |
| GB (1) | GB2022242B (en) |
| IT (1) | IT1117191B (en) |
| NL (1) | NL7903809A (en) |
| SE (1) | SE7904269L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3517825C1 (en) * | 1985-05-17 | 1986-04-30 | Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn | Fibre optical sensor |
| AU4782100A (en) | 1999-05-26 | 2000-12-18 | Asahi Kasei Kabushiki Kaisha | Plushed fabric and stuffed toy using the same |
| RU2454685C1 (en) * | 2010-11-25 | 2012-06-27 | Государственное учреждение Научный центр гравитационно-волновых исследований "Дулкын" | Gravitational wave detector |
| CN117111163A (en) * | 2023-08-07 | 2023-11-24 | 之江实验室 | Gravity measuring device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3129304A (en) * | 1960-09-23 | 1964-04-14 | Cutler Hammer Inc | Reversible contact molded frame relay |
| US3194920A (en) * | 1964-06-23 | 1965-07-13 | Ward Leonard Electric Co | Electrical contactor |
| GB1273255A (en) * | 1969-09-11 | 1972-05-03 | Midland Electric Mfg Co Ltd | Electromagnetic switches |
| US3648203A (en) * | 1970-08-26 | 1972-03-07 | Honeywell Inc | Relay switch housing |
-
1979
- 1979-05-10 GB GB7916143A patent/GB2022242B/en not_active Expired
- 1979-05-15 SE SE7904269A patent/SE7904269L/en not_active Application Discontinuation
- 1979-05-15 NL NL7903809A patent/NL7903809A/en not_active Application Discontinuation
- 1979-05-25 CA CA328,424A patent/CA1115544A/en not_active Expired
- 1979-05-25 IT IT49186/79A patent/IT1117191B/en active
- 1979-05-29 JP JP6670979A patent/JPS54156686A/en active Pending
- 1979-05-29 DE DE19792921788 patent/DE2921788A1/en not_active Withdrawn
- 1979-05-29 FR FR7913680A patent/FR2427619A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2427619A1 (en) | 1979-12-28 |
| CA1115544A (en) | 1982-01-05 |
| IT7949186A0 (en) | 1979-05-25 |
| DE2921788A1 (en) | 1979-12-06 |
| JPS54156686A (en) | 1979-12-10 |
| GB2022242B (en) | 1983-04-27 |
| IT1117191B (en) | 1986-02-17 |
| NL7903809A (en) | 1979-12-04 |
| GB2022242A (en) | 1979-12-12 |
| FR2427619B1 (en) | 1983-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NAV | Patent application has lapsed |
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