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

How can a temporary diversion to laid, Q. How can a temporary diversion to ...

Q. How can a temporary diversion to laid a cross flowing river in case of disruption to rail traffic over a major bridge lasting over 6 months. Ans.- Temporary diversion

EDTA, how to find total hardness by EDTA

how to find total hardness by EDTA

Explain template jig, Explain Template Jig? 1) Template jig is the simp...

Explain Template Jig? 1) Template jig is the simplest type of jig, employed for accuracy than speed. 2) This jig fits over, on, or, into the work and is not generally clampe

Explain the equalization basins - hydraulic system, Equalization Basins - H...

Equalization Basins - Hydraulic System For influent flow to publicly owned treatment works (POTWs), flow rates may be excessive for short or long durations, especially in combi

Dams, The regulations and specifications that followed for compaction works...

The regulations and specifications that followed for compaction works for earth dam in Oman

What is function of mortar in brick walls, Q. What is Function of mortar in...

Q. What is Function of mortar in brick walls? A distinctive brick wall structure generally comprises the subsequent components:  (i)  Coping on top of the brick wall to prot

Settlement due to lowering of water table, Q. Settlement due to Lowering of...

Q. Settlement due to Lowering of Water Table? Water table is encountered with, whenever any excavations are made for foundations. The water is to be out for working conditions.

Keywords related to water transportation, Keywords related to water transpo...

Keywords related to water transportation: Oceanic Shipping: Shipping taking place in the oceans. Coastal Shipping: Shipping taking place along the coast line. Inlan

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