This text investigates the technical application and measurement of sound intensity as a critical metric for determining sound source power in acoustical metrology. Frank Fahy, a recognized authority in the field of acoustics, synthesizes the development of instrumentation capable of measuring energy flow within sound fields. The book provides a rigorous framework for understanding how these measurements have transformed audio-frequency metrology, particularly in the context of evolving international standards.

Experts and practitioners in the field of acoustics regard this work as a foundational reference for understanding the practical implementation of sound intensity measurements. Readers frequently note the technical density of the prose, which serves as a primary resource for engineers and researchers working with international acoustic standards.