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An acoustic Doppler current profiler ( ADCP ) is a hydroacoustic current meter similar to a sonar , used to measure water current velocities over a depth range using the Doppler effect of sound waves scattered back from particles within the water column .
 person: Doppler
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Doppler 
Answer:
 person: Doppler