GB1296070A - - Google Patents
Info
- Publication number
- GB1296070A GB1296070A GB1296070DA GB1296070A GB 1296070 A GB1296070 A GB 1296070A GB 1296070D A GB1296070D A GB 1296070DA GB 1296070 A GB1296070 A GB 1296070A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- prism
- cell
- split
- laser
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
1296070 Electro-optical levelling instruments JUNGNER INSTRUMENT A B 30 Dec 1969 [13 Jan 1969] 63337/69 Heading G1A An optical device for use in a levelling instrument comprises a laser light source 1 whose beam is split in unit 7 to fall on two photo-cells 4, 5 housed in detector 6. One of the split beams is given an additional reflection so that for a small angular deflection of the beam leaving laser 1 the oplit beams are deflected up and down respectively so that the balance of illumination on the two photo-cells is not disturbed. As shown the beam is reflected in prism 2 and split in prism 3 with the beam for photo-cell 4 being subjected to an extra reflection. In alternative embodiments different kinds of prisms may be used, e.g. a divided pentagon prism, Fig. 4 (not shown) and by use of a lens or prism system only a single photocell need be used, Figs. 2 and 3 (not shown). The apparatus can be modified to act as an autocollimator and define a plane by providing one photo-cell in the support for the laser and a second in the position detector together with a prism for reflecting light on to the one photo-cell, Fig. 6 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE37469A SE323223B (en) | 1969-01-13 | 1969-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1296070A true GB1296070A (en) | 1972-11-15 |
Family
ID=20256467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1296070D Expired GB1296070A (en) | 1969-01-13 | 1969-12-30 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2000828B2 (en) |
| GB (1) | GB1296070A (en) |
| SE (1) | SE323223B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4035084A (en) * | 1976-02-19 | 1977-07-12 | Ramsay James D | Automatic levelling method and apparatus for rotating laser beam transmitter |
-
1969
- 1969-01-13 SE SE37469A patent/SE323223B/xx unknown
- 1969-12-30 GB GB1296070D patent/GB1296070A/en not_active Expired
-
1970
- 1970-01-09 DE DE19702000828 patent/DE2000828B2/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2000828A1 (en) | 1970-07-16 |
| SE323223B (en) | 1970-04-27 |
| DE2000828B2 (en) | 1971-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |