Accuracy and range - angle measurement, Civil Engineering

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.

Posted Date: 2/11/2013 5:18:46 AM | Location : United States







Related Discussions:- Accuracy and range - angle measurement, Assignment Help, Ask Question on Accuracy and range - angle measurement, Get Answer, Expert's Help, Accuracy and range - angle measurement Discussions

Write discussion on Accuracy and range - angle measurement
Your posts are moderated
Related Questions
Determine the area ratio of a thin walled tube samples having an external diameter of 6 cm and a wall thickness of 2.25 mm. Do you recommend the sampler for getting undisturbed soi

designofboredunderreamedpiles

Calculate the Benefit-Cost Ratio for Municipal Government Project With interest at 10%, the benefit-cost ratio for this municipal government project is most nearly:   Initia

Question What is major disparity between fasteners , bolts and screws ? Answer Fastener is a broad term to explain something that is used as a restraint for holding

What is the Pre-tensioned concrete In Pre-tensioned concrete tendons are kept stretched with suitable mechanisms and concrete is cast into the forms through which stretched ten

The two plates shown below are each 10-in. wide by ¾- in. thick. The gage distance, g, and the longitudinal spacing on each member is set at 4-in. Determine the axial strength of t


sir i want to know that which pages of IS800:2007 is used for steel design of tension member, compression member, collumn, beam, connections, trusses etc.. please give me the topic

chaining on level surface

Q. Grouting in segmental linings in tunnels? Grouting is typically carried out under pressure in segmental linings at the time of tunnel construction due to the below reasons: