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Surveying FS

Category - Data Acquisition

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Which survey device generates an infrared continuous wave carrier beam and measures the phase-shift of the reflected beam to determine the distance of an object?

Theodolite
EDM
GPS
Transit

Explanation

Answer: B - An EDM generates an infrared continuous wave carrier beam and measures the phase-shift of the reflected beam to determine the distance of an object. EDMs utilize the basic distance measurement principle of comparing a measurement to a known distance. With EDMs, the known distance is the wavelength of the modulation of a carrier wave.

EDM stands for electronic distance measurement.

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