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Which of the following is an E.D.M. instrument?
Chain & Tape
Optical square
Geodimeter
None of the above
Geodimeter
An Electronic Distance Measurement (EDM) instrument is a surveying device used to measure distances by employing electromagnetic waves, typically light or radio waves. The Geodimeter is a classic example of an EDM that uses visible light waves for high-precision distance measurement.
An Electronic Distance Measurement (EDM) instrument is a surveying device used to measure distances by employing electromagnetic waves, typically light or radio waves. The Geodimeter is a classic example of an EDM that uses visible light waves for high-precision distance measurement.
D=2vтЛЕtтАЛ тАФ Distance measurement formula using EDM
╬Ф╧Х=v2╧АfDтАЛ тАФ Phase difference related to distance
The instrument measures the time taken by an electromagnetic wave to travel to a reflector and back. The distance D is calculated using the formula D=21тАЛvтЛЕt, where v is the velocity of the wave in the medium and t is the round-trip travel time. Phase difference measurement between the transmitted and received signals is used to determine the precise time interval t.
Geodimeter stands for 'Geodetic Distance Meter'.
EDM instruments provide significantly higher accuracy compared to traditional mechanical methods.
Most modern EDMs use infrared (IR) light instead of visible light.
EDMs are integral components of Total Stations.
High precision and accuracy over long distances.
Capable of measuring distances across inaccessible terrain.
Requires line-of-sight between the instrument and reflector.
Depends on atmospheric conditions affecting the speed of electromagnetic waves.
Geodetic surveying
Construction layout
Monitoring structural deformation
Chain & Tape are manual/mechanical measurement tools, not electronic.
Optical squares are used for setting out right angles, not for electronic distance measurement.
C is correct тАФ Geodimeter is a well-known EDM instrument that uses light waves to determine distance.
Always remember that EDM is a distance measurement technique; if the question asks for angles, it refers to Theodolites or Total Stations.