@prefix dct: . @prefix ns1: . @prefix ns2: . @prefix ns3: . @prefix rdfs: . @prefix skos: . a skos:Concept, ns2:Entity ; dct:created "2019-01-14" ; dct:modified "2019-01-14" ; ns3:hasProfile ; ns1:status ; rdfs:seeAlso ; skos:definition "Sonic anemometers first developed in the 1950s; use ultrasonic sound waves to measure wind velocity. They measure wind speed based on the time of flight of sonic pulses between pairs of transducers. Measurements from pairs of transducers can be combined to yield a measurement of velocity in 1-; 2-; or 3-dimensional flow. The spatial resolution is given by the path length between transducers; which is typically 10 to 20 cm. Ultrasonic anemometers can take measurements with very fine temporal resolution; 20 Hz or better; which makes them well suited for turbulence measurements."@en ; skos:exactMatch ; skos:prefLabel "sonicAnemometer"@en ; ns2:hadPrimarySource .