Length mode piezoelectric ultrasonic transducer for inspection of solid objects

US4122725A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventor

• Robert B. Thompson · Thousand Oaks, US

Key dates

• Filing date: Jun 16, 1976
• Grant date: Oct 31, 1978
• Expiry date: Jun 16, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B06B1/0622
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The transducer is constructed from individual transducer elements arranged in an array and configured to exhibit a predominant, longitudinal mode transversely to the array. The elements are interconnected through thin flexible sheets. Each element is individually damped, and the transducer as a whole is electrically damped through resonance with the clamped capacitance and dissipation. Electrical control permits in-phase operation of all transducer elements or control with preselected phase differences.