Accuracy and range - angle measurement, Civil Engineering

Assignment Help:

Accuracy and Range - Angle measurement:

Accuracy and Range:-Angle measurement:-Most modern total station instruments measure angles by means of electro-optical scanning of extremely precise digital bar-codes etched on rotating glass cylinders or discs within the instrument. The best quality total stations are capable of measuring angles to 0.5 arc-second. Inexpensive "construction grade" total stations can generally measure angles to 5 or 10 arc-seconds.

Distance measurement:-Measurement of distance is accomplished with a modulated microwave or infrared carrier signal, generated by a small solid-state emitter within the instrument's optical path, and reflected by a prism reflector or the object under survey. The modulation pattern in the returning signal is read and interpreted by the computer in the total station. The distance is determined by emitting and receiving multiple frequencies, and determining the integer number of wavelengths to the target for each frequency. Most total stations use purpose-built glass corner cube prism reflectors for the EDM signal. A typical total station can measure distances with an accuracy of about 1.5 millimetres (0.0049 ft) + 2 parts per million over a distance of up to 1,500 metres (4,900 ft).

Reflectorless total stations can measure distances to any object that is reasonably light in color, up to a few hundred meters.


Related Discussions:- Accuracy and range - angle measurement

Structural connection loosening - deterioration in steel, Define Structural...

Define Structural connection loosening - Deterioration in Steel? Structural connections joined together by rivets or bolts have a tendency to work loose over an extended period

Geotechnical Design, I need this to be done perfectly . It is a civil engin...

I need this to be done perfectly . It is a civil engineering assignment. Please let me know if you can solve this perfectly within no more than 40 hours. Thanks.

Cost-volume relationship, Cost-volume relationship: Cost-volume relati...

Cost-volume relationship: Cost-volume relationship is illustrated through a simple example dealing with the cost of operating an automobile. To perform the analysis following

Chain survrying, How do we overcome obstacle like river in chain survey?

How do we overcome obstacle like river in chain survey?

Enumerate the term - superposing the stress variations, Enumerate the term ...

Enumerate the term - superposing the stress variations If the case of concentric pre-stressing is considered, we can appreciate that stress at any section of the beam is compr

Steel tubular marine piles, Question Give genuine reason that why are ...

Question Give genuine reason that why are steel tubular marine piles often driven open-ended? Answer In marine structure where piles are constantly topic to major la

Stacking of materials for building, briefly explain the stacking of materia...

briefly explain the stacking of materials in the site for general building?

AERATED CONCRETE, AIR ENTRAINING AGENT USED IN CONCRETE OTHER THAN ALUMINIU...

AIR ENTRAINING AGENT USED IN CONCRETE OTHER THAN ALUMINIUM POWDER

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd