Principle of Ultrasound
摘要
The discovery of ultrasound waves dates back to 1793, when Lazzaro Spallanzani, an Italian biologist, observed the echolocation ability of bats in navigation [1]. Later on, in 1915, Pierre and Jacques Curie observed the phenomenon of piezoelectric effect, which refers to the generation of electric charges by specific crystals under mechanical pressure thereby generating pressure waves upon application of electricity. This significant finding led to the development of ultrasound transducers capable of emitting and receiving such waves.