AN ACOUSTIC LUNEBERG LENS FOR LOW-FREQUENCY SONAR USE Open PDF Document Details Document Type Technical Report Publication Date Jul 16, 1958 Accession Number AD0301006 Entities People J. J. Yagelowich Organizations United States Naval Research Laboratory Tags Communities of Interest Advanced Electronics DTIC Thesaurus Topics Acoustic Propagation Acoustic Properties Acoustics Air Gaps Electronics Laboratories Frequency Government Procurement Governments Hydrophones Lenses Lightweight Materials Refractive Index Signal Processing Transducers United States United States Government