Anemometer beam exits reflect, or backscatter, the light back into a detector, where it is measured relative to the original laser beam. When the particles are in great motion, they produce a Doppler shift for measuring wind speed in the laser light, which is used to calculate the speed of the particles, and therefore the air around the anemometer. Ultrasonic 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
Field Music (Measure) Field Music (Measure) Field Music (Measure) is the third full-length studio album by indie rock band Field Music. It was released on 15 February 2010. Officially, the album's name is the same as their debut album; the name "Measure", other than being the name of one of the songs, does not appear anywhere on the album's artwork. However, both fans and the band have taken to calling it "Measure" to distinguish the two. "Measure" is a double album and is split into two discs. The first disc primarily contains more traditionally-structured songs, including both of the album's singles ("Them That