Dolphins use double sonar. 07 June 2011 Dolphins and porpoises use echolocation for hunting and orientation. By sending out high-frequency sound, known as ultrasound, dolphins can use the echoes to determine what type of object the sound beam has hit. Researchers from Sweden and the US have now discovered that dolphins can generate two sound beam projections simultaneously. “The beam projections have different frequencies and can be sent in different directions.
The advantage is probably that the dolphin can locate the object more precisely”, says Josefin Starkhammar, a newly examined doctor in Electrical Measurements at Lund University, who also holds a Master’s degree in Engineering Physics. The study, which was carried out together with scientists from San Diego, was published in the latest issue of the journal Biology Letters. “The findings add fuel to an already fierce debate in the research community on how the echolocation sound is produced”, says Josefin Starkhammar. Read a popularised summary of her thesis. Harmonic oscillation HD. Wheatstone Wave Machine, c. 1875, Physics Dept., Union College, NY. maker: Rudolph Koenig. WAVES Art by Heinrich Eder. Simple Harmonic Motion for beginners - in 3 minutes.