GB1347657A - Magnetic compasses and similar arrangements - Google Patents
Magnetic compasses and similar arrangementsInfo
- Publication number
- GB1347657A GB1347657A GB3385272A GB3385272A GB1347657A GB 1347657 A GB1347657 A GB 1347657A GB 3385272 A GB3385272 A GB 3385272A GB 3385272 A GB3385272 A GB 3385272A GB 1347657 A GB1347657 A GB 1347657A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- axis
- instant
- counter
- field
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/02—Magnetic compasses
- G01C17/28—Electromagnetic compasses
- G01C17/30—Earth-inductor compasses
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
1347657 Measuring angles FRANCE ARMED FORCES MINISTER OF 19 July 1972 [19 July 1971] 33852/72 Heading G4H Apparatus for measuring the angle between a particular direction and a magnetic field F, e.g. the horizontal component of the earth's field, comprises a motor 1 coupled to rotate a disc 2 and a coil B about an axis x-x<SP>1</SP>, the disc having a single aperture M therein arranged to cooperate with a photo-electric sensing device 4, 5 at a position M 0 , the line joining the axis of rotation to the point M 0 defining the particular direction, the coil having its axis arranged horizontally as shown and equipped with brushes 6 whereby a varying electrical signal may be derived having zero values when the axis of the coil is parallel and anti-parallel with the field, timing means being provided to time the interval between the instant the photo-cell is activated, i.e. the coil is aligned with the particular direction, and the instant of zero value, negative derivative signal from the coil, i.e. the axis of the coil is parallel with the field. The timing means comprises a clock source and a binary counter and binary-digital converter whereby the first instant enables the counter and the second instant stops the counter. For controlling purposes, the counter output may be compared with a desired value to provide a control signal. This process may take place via a radio receiver-transmitter link.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7126284A FR2146554A5 (en) | 1971-07-19 | 1971-07-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1347657A true GB1347657A (en) | 1974-02-27 |
Family
ID=9080539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3385272A Expired GB1347657A (en) | 1971-07-19 | 1972-07-19 | Magnetic compasses and similar arrangements |
Country Status (6)
Country | Link |
---|---|
AU (1) | AU459909B2 (en) |
DE (1) | DE2230852A1 (en) |
FR (1) | FR2146554A5 (en) |
GB (1) | GB1347657A (en) |
IT (1) | IT950181B (en) |
SE (1) | SE369961B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2287681A1 (en) * | 1974-10-11 | 1976-05-07 | France Etat | Digital magnetic compass - produces digital measurement of azimuth of given direction with respect to earths magnetic field |
US4139951A (en) * | 1977-03-23 | 1979-02-20 | Cunard Thomas L | Remote indicating compass |
US4117602A (en) * | 1977-04-04 | 1978-10-03 | The Laitram Corporation | Electromagnetic compass |
-
1971
- 1971-07-19 FR FR7126284A patent/FR2146554A5/fr not_active Expired
-
1972
- 1972-03-09 SE SE298372A patent/SE369961B/xx unknown
- 1972-03-14 IT IT2183472A patent/IT950181B/en active
- 1972-04-17 AU AU41219/72A patent/AU459909B2/en not_active Expired
- 1972-06-23 DE DE19722230852 patent/DE2230852A1/en active Pending
- 1972-07-19 GB GB3385272A patent/GB1347657A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2146554A5 (en) | 1973-03-02 |
AU459909B2 (en) | 1975-04-10 |
AU4121972A (en) | 1973-10-25 |
DE2230852A1 (en) | 1973-02-01 |
IT950181B (en) | 1973-06-20 |
SE369961B (en) | 1974-09-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |