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Electronic distance measurement
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Electronic distance measurementStudent: Ivanova Ekaterina
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Vocabulary■ Change [tʃeɪndʒ] – изменение
■ Taping [teɪp] – лента
■ Conducted [kənˈdʌkt] – проводить
■ Wedge attachments [wedʒ] [əˈtætʃ.mənt] – клиновые насадки
■ Difficult terrains [ˈdɪfɪkəlt] [terrain] – труднопроходимая местность
■ Light beam [laɪt] [biːm] – световой луч
■ Conduct [kənˈdʌkt] – проводить
■ Implemented [ˈɪm.plɪ.ment] – реализован
■ Obstacles [ˈɒb.stɪ.kl̩] - препятствие
■ Conclusion [kənˈkluːʒn] – вывод
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1. Terms■ Electronic distance measuring instrument is a surveying instrument for measuring distance
electronically between two points through electromagnetic waves. Electronic distance measurement
(EDM) is a method of determining the length between two points, using phase changes, that occur
as electromagnetic energy waves travels from one end of the line to the other end.
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There are three methods of measuring distance between two points:■ DDM or Direct distance measurement
■ ODM or Optical distance measurement
■ EDM or Electromagnetic distance measurement
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■ Electronic distance measurement in general is a term used as a method for distance measurementby electronic means. In this method instruments are used to measure distance that rely on
propagation, reflection and reception of electromagnetic waves like radio, visible light or infrared
waves. Sun light or artificially generated electromagnetic wave consists of waves of different
lengths.
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2.Origin of Electronic Distance Measurement■ The first EDM instrument called geodimeter was developed in Sweden in the year 1948. Geodimeter
is geodetic distance meter developed based on a modulated light beam. The second instrument for
EDM was designed and developed in Africa in the year 1957, named tellurometer. This instrument
employs modulated microwaves. As years passed technology has improved drastically.
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3.Types of Electronic Distance Measurement InstrumentEDM instruments are classified based on the type of carrier wave as
Microwave instruments
Light wave instruments.
Infrared wave instruments
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4. Conclusion■ The advantage of using EDM instruments is the speed and accuracy in
measurement. Several obstacles to chaining are automatically
overcome when these instruments are used.
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Bibliography■ https://www.engineersupply.com/EDM.aspx
■ https://theconstructor.org/surveying/electronic-distance-measurement-instrument/6576/
■ https://civilscoops.com/electronic-distance-measurement-instrument-types-functions-operations/