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 head loss due to friction using the Darcy-Weisbach equation. The water is pumped at 3.0 gallons per minute, has a temperature of 60 °F and is pumped through a 1inch s

Define the Predominant factor in atmospheric corrosion? The predominant factor in atmospheric corrosion in areas located above splash zone is moisture as there is an excess ava


I have assignment for hydraulics can you help for that

Q. Vibration in structures - resilient bearings? When railway tunnels are built close to buildings, ground-borne vibration is transmitted to buildingsthrough compression and sh

Question For drained reclamation, what will significance of smear zone bring by installation of band drains ? Answer Throughout installation of band drains, smear zon

Tests on Stones To ascertain the needed properties of stones, described tests can be conducted: A.   Crushing strength test B.   Water absorption test C.   Abrasion te


Based on the information provided in Figure, the difference in elevation between BM and TP 2 is most nearly: Solution: Set up a Table as shown below and insert the kno

Define the Highlights of Critical Path Method A network analysis technique used to predict project duration by analyzing which sequence of activities has the least amount o