GB994277A - Improvements in or relating to surveying systems - Google Patents
Improvements in or relating to surveying systemsInfo
- Publication number
- GB994277A GB994277A GB2522662A GB2522662A GB994277A GB 994277 A GB994277 A GB 994277A GB 2522662 A GB2522662 A GB 2522662A GB 2522662 A GB2522662 A GB 2522662A GB 994277 A GB994277 A GB 994277A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- july
- transmitter
- cell
- support
- 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
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/002—Active optical surveying means
Abstract
994,277. Photo - electric height determination. A. LORAND. July 15, 1963 [July 2, 1962], No. 25226/62. Heading H4D. A surveying system for determining the difference in level between two points comprises a transmitter, Fig. 1, emitting a horizontal beam of light at the first point and a receiver at the second point incorporating a photo-cell 21, Fig. 2, controlling a circuit whereby support 27 is driven vertically until the emitted light beam is detected, a graduated scale being provided on support 27. The transmitter in Fig. 1 consists of a helix 13 of tungsten with its longitudinal axis horizontal and a lens system 11, both of which are mounted for sliding to or from parabolic mirror 12; alternatively a laser beam may be employed. The photo-cell is a photo-sensitive resistance in a Schmitt trigger circuit and may be provided with a sensitivity control to achieve discrimination against ambient light; the trigger circuit controls a relay actuating a switch between an elevating motor and battery, a red indicator lamp being energized when the motor runs, Fig. 4 (not shown). The transmitted beam may be wide in azimuth in order that several receivers can operate simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2522662A GB994277A (en) | 1962-07-02 | 1962-07-02 | Improvements in or relating to surveying systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2522662A GB994277A (en) | 1962-07-02 | 1962-07-02 | Improvements in or relating to surveying systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB994277A true GB994277A (en) | 1965-06-02 |
Family
ID=10224252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2522662A Expired GB994277A (en) | 1962-07-02 | 1962-07-02 | Improvements in or relating to surveying systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB994277A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3732418A (en) * | 1960-12-17 | 1973-05-08 | Kalle Ag | Reproduction process using infrared radiation |
-
1962
- 1962-07-02 GB GB2522662A patent/GB994277A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3732418A (en) * | 1960-12-17 | 1973-05-08 | Kalle Ag | Reproduction process using infrared radiation |
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