Lazar Davidovich Rosenberg

Lazar Davidovich Rosenberg
(1908 - 1968)

 

Lazar Davidovich Rosenberg is an internationally known scientist in the field of acoustics.

The scientific career of Rosenberg began at the research laboratory of the Kiev film studio in 1930. One of his first scientific publications (1932) reported on the study of the reverberation that accompanies sound recording and reproduction.

In 1936, Rosenberg became the chair of the Department of Acoustics at the Kiev Institute of Cinema Engineers.

In 1938, he organized a group of engineers for the development of acoustical systems that should be used in the Palace of Soviets. While working on this project, he and his co-workers studied and, to a large extent, solved the problems of creating high-quality acoustics and sound reinforcement in large-size halls (of seating capacity up to 25,000). His group developed special sound-absorbing structures, systems of sound reinforcement based on highly-directional powerful loud speakers and systems of distributed loud speakers, and a method for calculating the sound fields generated by the distributed systems.

In 1942-1943, Rosenberg collaborated with N.N. Andreyev to develop a weapon for the protection against acoustic mines.

In late 1940s, Rosenberg together with his colleagues discovered the effect of long-distance sound propagation in the sea and the existence of the underwater sound channel (these results were obtained independently of the American scientists).

For their achievements in acoustics, Rosenberg and his co-workers received a First-Degree Stalin Award in 1950.

The early 1950s marked the beginning of the development of acoustic imaging: the studies of acoustic focusing systems and methods of the conversion of acoustic images into visible ones were progressing steadily. Theoretical and experimental studies of focusing systems provided the basis for the development of the theory of acoustic imaging and methods for the concentration of ultrasonic energy. These methods and the theory were described in the monograph published by Rosenberg in 1949 under the title "Acoustic Focusing Systems".

Since the day of the establishment of the Acoustics Institute of the Academy of Sciences of the USSR in 1954, Rosenberg headed its Ultrasonic Department.

At this department, he initiated research projects concerned with the industrial applications of ultrasound: the studies of acoustic cavitation (1958 - 1965) laid the foundation for the development of the technology (and the corresponding equipment) of ultrasonic cleaning; the studies of ultrasonic cutting resulted in the design of a high-efficiency ultrasonic machine; other projects were concerned with ultrasonic atomization of fluids, low-temperature drying with the help of acoustic vibrations, ultrasonic degassing, etc.

The results obtained by Rosenberg and his co-workers over many years of work were summarized in the monograph on "Ultrasonic Cutting" and a three-volume monograph entitled "Physics of High-Intensity Ultrasound and Ultrasonic Technology".

Rosenberg is the author of more than 80 scientific works, over 100 reviews and popular-scientific papers, and about 50 encyclopedic articles. He owns 15 inventor's certificates concerned with ultrasonic application.

Rosenberg created a scientific school in physics of ultrasound; 18 researchers received candidate and doctoral degrees while working under his supervision.

Rosenberg had a talent for the popularization of physical acoustics and acoustical engineering: he published a scientific-popular book - "A Story about Inaudible Sounds" (1961), took part in the production of a scientific-popular film called "In the World of Ultrasound", etc.

Rosenberg chaired the Council on Ultrasonics and Physics of Ultrasound at the Division of General Physics and Astronomy of the Academy of Sciences of the USSR; he was member of the Council on Acoustics and other councils, member of the editorial boards of the "Akusticheskii zhurnal" (Acoustical Physics) and "Ul'trazvukovaya tekhnika" (Ultrasonics).