ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

2pSA1. The measurement of target strength of complex underwater structures---The early years.

Jan M. Niemiec

Naval Surface Warfare Ctr., Carderock Div., Bethesda, MD 20084-5000

By the early 1970's, few measurements of target strength of large scale underwater structures had been made. Novel measurement techniques to control the range, depth, and aspect angle of the underwater target had to be developed. Unique instrumentation had to be devised to measure the incident sound level at the target and to reliably record the scattered sound wave on a ping by ping basis without interrupting the rotating target. Dr. Wayne Reader lead a group of scientists and engineers who successfully overcame many of these difficulties and measured the target strength of a large scale model of a complex structure known as KAMLOOPS. In addition to providing the leadership for the resolution of many technical problems, Wayne Reader developed a unique method to calibrate the scattering measurements by using the doubly curved surface of the KAMLOOPS dome as a standard target. Many of the measurement techniques pioneered by Wayne are still in use today. This talk outlines the aspects of a model target strength measurement and illustrates some of the many contributions that Wayne made to this field of science.