Advanced Nondestructive Evaluation (Ultrasonic Pulser/Receiver Technology).
Abstract
The overall goal of this program was to develop a digital ultrasonic correlation system for NDE application of greater versatility and capability than the successful analog system developed in-house at AFWAL/MLLP. SRL had only limited success in meeting this overall goal. The program broke into two complementary tasks: (1) development of an all-digital Pulser/Receiver with a bandwidth of 85 MHz and a maximum gain of 80 dB; and (2) development of a pseudo-random correlation unit. The Pulser/Receiver met all of its necessary requirements; however, the correlation unit suffered from a technical design decision made early in the program as to the number of 'bits' used in the correlation process. The decision (based upon both cost and the results of the computer model of an 8-bit correlation system) was to utilize 1-bit correlation. This choice led to an unavoidable (and most undesirable) nonlinearity in the correlated signal output when the input signal/noise ratio approached unity. This unfortunate consequences has restricted the versatility and capability of the entire system.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1982
- Accession Number
- ADA117841
Entities
People
- Robert A. Shaufl