Factors in the design of ultrasonic probes
Abstract
An attempt is made to show how the unit-impulse-response technique can be used to evaluate and calibrate thickness mode peizoelectric transducers and the ultrasonic probes made from these transducers for flaw detection. The transducer theory is discussed relative to transmission, detection, discrimination, and method. Batches of 20 each of barium titanate (BT) and lead zirconate titanate (PZT) piezoelectric transducers with diameters of 20, 15 and 10 mm at frequencies of 1.5, 2.5 and 5 MHz respectively are used in the tests. The effects of backing, quarter-wavelength matching into water, and electrical tuning are measured and discussed. The agreement of experimental measurements with theory makes the unit-impulse-response technique a direct tool for measuring basic piezoelectric properties of thickness mode BT and PZT disk transducers in the 1.5-5 MHz range.
- Publication:
-
Ultrasonics
- Pub Date:
- January 1979
- Bibcode:
- 1979Ultra..17...20S
- Keywords:
-
- Acoustic Properties;
- Piezoelectric Transducers;
- Transient Response;
- Ultrasonic Tests;
- Ultrasonic Wave Transducers;
- Acoustic Attenuation;
- Acoustic Impedance;
- Backups;
- Barium Titanates;
- Calibrating;
- Lead Titanates;
- Matching;
- Signal Detection;
- Signal Reflection;
- Thickness;
- Instrumentation and Photography