CA2233598A1 - Apparatus for the measurement of gravitational fields - Google Patents
Apparatus for the measurement of gravitational fieldsInfo
- Publication number
- CA2233598A1 CA2233598A1 CA002233598A CA2233598A CA2233598A1 CA 2233598 A1 CA2233598 A1 CA 2233598A1 CA 002233598 A CA002233598 A CA 002233598A CA 2233598 A CA2233598 A CA 2233598A CA 2233598 A1 CA2233598 A1 CA 2233598A1
- Authority
- CA
- Canada
- Prior art keywords
- string
- pick
- feed
- output voltage
- coils
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 title abstract 2
- 230000004907 flux Effects 0.000 abstract 2
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000005484 gravity Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
Apparatus for measuring gravitational fields comprising a superconducting string (1) fixed at both ends and forming part of a closed superconducting loop inductively coupled to two driving solenoids (L d1, L d2). Displacement of the string in response to a gravitational field is sensed by two magnetic flux transformers each comprising a signal coil and two pick-up coils (L p1, L p2). Pairs of pick-up coils lie in two perpendicular planes providing two independent channels of measurements. The two arms of each flux transformer are balanced to convert only the amplitudes of the string's antisymmetric natural modes into an output voltage. The output voltage of each channel is used to produce a feed-back current distribution (I y1, I y2) proximate and parallel to the string. By adjusting the feed-back current, the effective relaxation time and resonant frequency of the first antisymmetric mode of the string can be adjusted, while leaving the symmetric modes unchanged, thus increasing the apparatus' sensitivity to gravity gradients.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ264610 | 1994-10-04 | ||
| NZ26461094 | 1994-10-04 | ||
| PCT/GB1995/002349 WO1996010759A1 (en) | 1994-10-04 | 1995-10-04 | Apparatus for the measurement of gravitational fields |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2233598A1 true CA2233598A1 (en) | 1996-04-11 |
| CA2233598C CA2233598C (en) | 2006-04-04 |
Family
ID=36143345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002233598A Expired - Fee Related CA2233598C (en) | 1994-10-04 | 1995-10-04 | Apparatus for the measurement of gravitational fields |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2233598C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2465634A (en) * | 2008-11-28 | 2010-06-02 | Gravitec Instr Ltd | Gravitational gradiometer |
| GB2471662A (en) * | 2009-07-03 | 2011-01-12 | Gravitec Instr Ltd | A Gravitational Gradiometer comprising a flexible ribbon whose stiffness is modulated. |
| CN112882119A (en) * | 2020-12-09 | 2021-06-01 | 四川航天计量测试研究所 | Micro mass measuring device and method in microgravity environment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2508547B (en) * | 2009-07-03 | 2014-07-23 | Gravitec Instr Ltd | Gravitational gradiometer |
-
1995
- 1995-10-04 CA CA002233598A patent/CA2233598C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2465634A (en) * | 2008-11-28 | 2010-06-02 | Gravitec Instr Ltd | Gravitational gradiometer |
| GB2465634B (en) * | 2008-11-28 | 2012-10-03 | Gravitec Instr Ltd | Gravitational gradiometer |
| GB2471662A (en) * | 2009-07-03 | 2011-01-12 | Gravitec Instr Ltd | A Gravitational Gradiometer comprising a flexible ribbon whose stiffness is modulated. |
| GB2471662B (en) * | 2009-07-03 | 2014-06-11 | Gravitec Instr Ltd | Gravitational gradiometer |
| CN112882119A (en) * | 2020-12-09 | 2021-06-01 | 四川航天计量测试研究所 | Micro mass measuring device and method in microgravity environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2233598C (en) | 2006-04-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20131004 |