| 词条 | Laser level |
| 释义 |
In surveying and construction, the laser level is a control tool consisting of a laser beam projector that can be affixed to a tripod. The tool is leveled according to the accuracy of the device and projects a fixed red or green beam about the horizontal and/or vertical axis.[1] DevelopmentThe concept of a laser level has been around since at least the early 1970s,[2] the original spinning-mirror design laser plane and line level was patented by the late 1980s,[3] and the compact lens-based laser line level (as produced by many tool manufacturers today) was patented in the late 1990s.[4] Rotary laser levelA rotary laser level is a more advanced laser level in that it spins the beam of light fast enough to give the effect of a complete 360 degree horizontal or vertical plane, thus illuminating not just a fixed line, but a horizontal plane.[5] The laser beam projector employs a rotating head with a mirror for sweeping the laser beam about a vertical axis. If the mirror is not self-leveling, it is provided with visually readable level vials and manually adjustable screws for orienting the projector. A staff carried by the operator is equipped with a movable sensor, which can detect the laser beam and gives a signal when the sensor is in line with the beam (usually an audible beep). The position of the sensor on the graduated staff, also known as a grade rod, or story pole, allows comparison of elevations between different points on the terrain. Most laser levels are used in the construction industry. Tower-mounted laser levelA tower-mounted laser level is used in combination with a sensor on a wheel tractor-scraper in the process of land laser leveling to bring land (for example, an agricultural field) to near-flatness with a slight grade for drainage. Benefits[6]
See also
References1. ^{{cite book |first=L. S. |last=Blake |title=Civil Engineer's Reference Book |url=https://books.google.com/books?id=pM_8BAAAQBAJ&pg=SA6-PA14 |publisher=Elsevier |page=6 |isbn=978-1-4831-0233-7 |date=22 October 2013}} 2. ^{{cite patent|country=US|number=3897637|status=patent}} 3. ^{{cite patent|country=US|number=4973158|status=patent}} 4. ^{{Cite patent | country = US | number = 5836081 | status = patent | title = Light beam leveling means and method | pubdate = | gdate = 1998-11-17 | fdate = 1996-05-29 | pridate = | inventor = Steven J. Orosz, Jr. | invent1 = Orosz, Steven J., Jr. | invent2 = | assign1 = Schroeder, Charles F. | assign2 = | class = F21V 800 }} 5. ^{{cite book|author1=J. Uren|author2=W.F. Price|title=Surveying for Engineers|url=https://books.google.com/books?id=iQEdBQAAQBAJ&pg=PA543|date=17 March 2010|publisher=Palgrave Macmillan|isbn=978-1-137-05279-7|pages=543–}} 6. ^{{Cite web|url=http://dswcpunjab.gov.in/contents/data_folder/laser_level.htm|title=LASER LEVELING|website=dswcpunjab.gov.in|access-date=2017-08-03}} 7. ^{{Cite web|url=http://www.dswcpunjab.gov.in/contents/Laser_Leveling.htm|title=Laser Leveling|website=www.dswcpunjab.gov.in|access-date=2017-08-03}} 8. ^{{Cite web|url=http://dswcpunjab.gov.in/contents/data_folder/laser_level.htm|title=LASER LEVELING|website=dswcpunjab.gov.in|access-date=2017-08-03}} External links
| country = US | number = 4062634 | status = patent | title = System for controlling attitude of laser beam plane | pubdate = | gdate = 1977-12-13 | fdate = 1975-02-10 | pridate = | invent1 = Rando, Joseph F. | invent2 = Kahn, Michael E. | invent3 = Heumann, Thomas E. | invent4 = Luebbers, Scott S. | assign1 = Spectra-Physics, Inc. | assign2 = | class = G01B 1126 }}
3 : Construction equipment|Surveying instruments|Laser applications |
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