The History of Doppler

The Austrian, Christain Doppler lived 1803-1853. He was a Professor in Elementary Mathematics and Practical Geometry at the Institute of Physics at Vienna University. He first published what we now call the Doppler Principle in 1843 describing the frequency of a source to its velocity relative to an observer. His work continued with demonstrations of musicians on a moving train and he published again in 1846. It was not until a century later in 1957 that there is eveidence of the effect being considered in medicine. Satomura used it to study the heart structure and functioning in 1957-59. Franklin 1961 produced an ultrasonic flow meter based on the Doppler principle and by the late 1960s it had been used on patients with arterial and venous disease. Yao did much of the ongoing research and by 1989 had established normal and abnormal pressure index.