Toroidal, conical and spherical lenses in ultrasonic inspection
Abstract
The near field properties of sound beams produced by conventional (flat face) ultrasonic transducers limit the reliability of defect evaluation. It is demonstrated that conventional transducers, when fitted with three types of converging lenses; spherical, conical and toroidal, offer significant improvement in the ability to evaluate defects by reduction of the near field and production of small diameter, long range sound beams. The best of these, the toroidal lens, is the author's newest development and has the ability to virtually eliminate the near field and to collimate the ultrasonic beam of a conventional transducer. Application of the toroidal lens to the detection and evaluation of a wide variety of defect conditions is discussed.
- Publication:
-
Materials Evaluation
- Pub Date:
- March 1981
- Bibcode:
- 1981MatEv..39..391M
- Keywords:
-
- Beam Waveguides;
- Collimation;
- Lens Design;
- Near Fields;
- Ultrasonic Flaw Detection;
- Ultrasonic Wave Transducers;
- Conical Bodies;
- Focusing;
- Sidelobes;
- Signal Reflection;
- Spheroids;
- Toroids;
- Instrumentation and Photography