DEVELOPMENT OF A LOW FREQUENCY ULTRASONIC INSPECTION SYSTEM FOR THE M-149 WATER TANK,
Abstract
The purpose of the program was to determine the feasibility of low frequency ultrasonic techniques for detecting voids and debonds in the M-149 water tank. The major objectives of the program were to: (1) determine the capability of existing equipment, (2) investigate all low frequency techniques, (through-transmission, pulse-echo, and pitch-catch) to determine the best method, and (4) demonstrate it on a test tank. An evaluation of commercially available equipment showed that it was necessary to design and build a high power low frequency ultrasonic generator to investigate one sided methods, namely pulse-echo and pitch-catch. Extensive testing with pulse-echo and pitch-catch showed both methods to be unfeasible for this application. One technique for eliminating the inside operator was considered theoretically, but couldn't be tried experimentally because of a shortage of funds. This technique would make use of an omnidirectional transducer on the inside of a water filled M-149 tank. Investigation of this technique is recommended as a future course of action when the necessary funds are available or action warrants. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1967
- Accession Number
- AD0686345
Entities
People
- E. J. Kubiak