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

Brigdes, infomation about differnt brigdes

infomation about differnt brigdes

Stone soling - road pavements, Stone Soling: One of the early practic...

Stone Soling: One of the early practices in road construction was to provide a stone soling 150-225 mm in thickness. The stones are laid by manual labour, and stone spalls ar

What is a feasibility study, In order to make wise investments in a marketp...

In order to make wise investments in a marketplace experiencing enhancing levels of risk, companies are turning to feasibility studies to verify if they should offer new products,

Verify the coefficient of elastic uniform compression, Verify the coefficie...

Verify the coefficient of elastic uniform compression if a vibration test on a concrete block of 1 m cube gave a resonant frequency of 36 Hz in vertical vibration. The weight of

Autocad-introduction, Autocad-Introduction Learning to use a CAD syste...

Autocad-Introduction Learning to use a CAD system is similar to learning a new language. It is necessary tobegin with the basic alphabet and learn how to use it correctly and

Assignment., classification and characterstics of lintels

classification and characterstics of lintels

Explain in brief about the term - anchorage, Explain brief about the term -...

Explain brief about the term - Anchorage A device used to anchor tendons at the end of a concrete member is called as an anchorage in the case of post-tensioned concrete. In th

Show the properties of elastomer, Q. Show the Properties of Elastomer ? ...

Q. Show the Properties of Elastomer ? Though elastomeric bearings offer a number of advantages as compared to steel bearings, many failures have been reported pertaining to the

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