Ultrasonic Transducer Performance Requirements.
Abstract
Characteristic ultrasonic transducer parameters were measured for over one hundred sixty contact type ultrasonic transducers (of equivalent sizes) used by depot and field NDI shops in the Air Force. For each transducer, a maximum of twenty-four parameters was obtained which included electrical impedance, rf-echo and frequency spectrum, beam characteristics, sensitivity, and signal-to-noise ratio parameters. Transducers were categorized into six groups according to their nominal frequency and beam angle (i.e. 5 MHz and 10 MHz; 0 deg, 45 deg, and 60 deg). Except for 10 MHz-60 deg transducers, thirty-two transducers were evaluated for each category. For measurement of the beam characteristic parameters of the contact transducers, a side-drilled hole block and an automated data acquisition system were developed. Three small fatigue cracks of different sizes were used for the measurement of flaw signal-to-noise ratios (which determine the flaw detectability of a transducer). Wide variations were observed in the characteristic parameters for individual ultrasonic transducers having the same name-plate size, frequency and angle. However, the average performance for all transducers evaluated in each category of transducers was found consistent with theory. In order to find the characteristic parameters which primarily determine the flaw detectability of a transducer, a linear correlation analysis between pairs of parameters was conducted for each transducer category.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1981
- Accession Number
- ADA101169
Entities
People
- Cecil M. Teller
- Garry L. Burkhardt
- Hegeon Kwun
Organizations
- Southwest Research Institute