It has been observed in many researches conducted in the past that electromagnetic fields can have certain effects on biological systems. This innovative and comprehensive book integrates the well-developed theory and practical applications of electromagnetic fields. It consists of contributions made by international experts and lucidly elaborates various concepts like radiation, multi-frequency sensors, microwave sensors, numerical modeling and wavefield inversion in nondestructive testing, etc. It will provide in-depth knowledge to the readers. This book will serve as a valuable source of reference for graduate and post graduate students pursuing physics, biophysics, engineering, and associated disciplines.