DMS 206 Final
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17 terms
Terms | Definitions |
|---|---|
 Pythagoras | Greek mathematician who observed the relationship between sound pitch and frequency. He discovered the sonometer. |
| Christian Johann Doppler | Austrian scientist who studied the effect of motion on the pitch of sound. Called the Doppler effect. |
| Curie Brothers | discovered piezoelectricity. |
| John Wild | Helped develop the metal flaw detectors and naval sonar. |
| Ian Donald | Credited with perfecting the A-mode measurement of the fetal biparietial diameter making it possible to ultrasonically estimate fetal age, weight, and growth rate. Known as the "father of obstetrical ultrasound". |
| Archytas of Tarentum | 400 BC. Greek scholar, defined nature of sound. Sound is produced by the motion of one object striking another ... fast motion = high pitch ... slow motion = low pitch |
| Aristotle | 350 BC. Greek Philosopher and Scientist. Therory of Sound Propagation. Sound is carriewd to the ears by the movement of air. |
| Boethius | Roman Philosopher. First to compare sound wavws to the waves produced by dropping a pebble into a cal body of water. This theory is still used today. |
| Leonardo Da Vinci | 1500 AD. (Post renaissance period). Study of the physical properties of sound. Originated the idea that sound travels in waves. Credited with discovery that angle of reflection = angle of incidence. |
| Galileo | 1638. Frequency of sound waves determines pitch. |
| Sir Isaac Neewton | Late 1600's. Derivation of the theory of velocity. |
| Robert Boyle | Late 1600's. English Chemist. Popularized the theory of elasticity of air. |
| Lord Rayleigh | 1877. British scientist. THEORY OF SOUND published - marked the beginning of the modern study of acoustics. |
| Lazzaro Spallanzani | 1793. Italian Priest / Scientist. Studied activities of bats. Observation: bats could function if blinded in the dark, but not if deafened.... Theorized: bats were listening to something he could not hear - what it was he didn't know. |
| G.W. Pierce | 1938. Inveneted a sonic detector - pick up high frequency vibrations of bats and to convert them into audible sounds. |
| Karl Dussik | 1942. Austrian became the first physician to use ultrasound for diagnostic purposes ... used to detect brain tumors. |
| George Ludwig | 1947-1949. First used ultrasound to detect gallstones at MIT. A-Mode. |
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