Acoustic Imaging with a 100-ELEMENT Electronically Scanned and Focused Phased Array.
Abstract
The development and applications of an acoustic imaging system containing a 100 element phased receiving array which can scan and focus electronically is described. Two different types of phase contrast techniques for this system were developed. The first type measures the first derivative of the phase profile of an object while the second type detects the direct spatial phase variations. The first type is more suitable for objects with acoustic impedance close to that of water and the second type is geared toward objects with larger acoustic impedance compared with that of water. These two types of phase contrast techniques are complementary to each other. This acoustic imaging system is used to examine some industrial materials.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1978
- Bibcode:
- 1978PhDT........28L
- Keywords:
-
- Physics: Acoustics;
- Acoustical Holography;
- Imaging Techniques;
- Phased Arrays;
- Acoustic Measurement;
- Acoustic Velocity;
- Imagery;
- Phase Contrast;
- Sound Waves;
- Systems Engineering;
- Acoustics