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

Traffic surveys, Traffic Surveys: The following traffic surveys are n...

Traffic Surveys: The following traffic surveys are needed for preparing a good road project: Classified Volume Counts This survey is normally carried out for 7 days,

Millennium miles, Construction planning millennium miles

Construction planning millennium miles

Raft base of pumping stations, Question Why are voids filled with light...

Question Why are voids filled with lightweight infilling material in raft base of pumping stations ? Answer To decrease dead load and therefore to decrease settleme

Timber, uses of timber in civil engineering field and its physical state an...

uses of timber in civil engineering field and its physical state and chemical formula or symbol?

Optical square, Using an optical square how would you perform a rectangular...

Using an optical square how would you perform a rectangular tie?

Planning and scheduling tutorial, Am looking for .planning and scheduling...

Am looking for .planning and scheduling tutorial , cost engineering tutorials

Calculate the total area (acre) for lot, Calculate the Total Area (acre) fo...

Calculate the Total Area (acre) for Lot A 30-ft wide parabolic shaped stream divides the property as shown.  The total area (acre) for Lot 6 is most nearly: Solution:

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