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
What Does It Take (Dave Days song) to attack the cast and crew, along with himself. The cast fends off the kids, and its down to the boyfriend and Days. An audience member throws Dave his guitar. Dave blocks a hit from a sword the boyfriend is carrying, and knocks him to the ground by hitting him with the head of the guitar while doing a guitar flip. He then takes the sword he had and puts it to his neck while he is on the ground. The audience then claps, and Days and Lynn hug and wave to the crowd. What Does It Take (Dave Days