Ultrasonic transducer

• US 3,242,723 A
• Filed: 09/27/1962
• Issued: 03/29/1966
• Est. Priority Date: 09/27/1962
• Status: Expired due to Term

• Current Assignee: Dwight J. Evans
• Original Assignee: Dwight J. Evans
• Inventors: Evans, Dwight J.
• Application Number:
  US04/226,583
• Time in Patent Office: 1,279 Days
• US Class Current: 73/644
• CPC Class Codes: B06B 1/0651 of circular shape
• CPC Class Codes: G01N 2291/0426 Bulk waves, e.g. quartz crystal microbalance, torsional waves
• CPC Class Codes: G01N 29/24 Probes transducers for acoustic waves B06B, G10K; for measuring G01H
• CPC Class Codes: G10K 11/004 Mounting transducers, e.g. provided with mechanical moving or orienting device mountings specially adapted to a particular sound-producing device, see the preceding groups G10K1/00 - G10K9/00, e.g. G10K1/26, G10K1/28, G10K9/22; arrangements of sonic watch equipment on submarines B63G8/39; buoys B63B22/00

Claims

1. A LOW POWER ULTRASONIC TRANSDUCER FOR MEASURING THE PHYSICAL CHARACTERISTICS OF MATERIALS WHICH ARE WITHIN A TEMPERATURE RANGE NORMALLY ABOVE THE OPERABLE PHYSICAL LIMITS OF PIEZO-ELECTRIC ELEMENTS, COMPRISING:

A TUBULAR BODY MEMBER;

A PIEZO-ELECTRIC CRYSTAL MEMBER AT ONE SEALED END OF SAID BODY MEMBER;

ELECTRICAL CONDUCTORS COMMUNICATING WITH SAID CRYSTAL TO PROVIDE LOW POWER OUTPUT THERETO AND EXTENDING EXTERIORLY OF SAID BODY MEMBER;

AND A BARRIER COUPLED TO SAID CRYSTAL, SAID BARRIER HAVING THE CHARACTERISTICS OF THERMALLY PROTECTING SAID CRYSTAL FROM TEMPERATURE WHICH ARE ABOVE THE NONPIEZO-ELECTRIC TEMPERATURE OF SAID CRYSTAL, SAID BARRIER BEING ULTRASONICALLY TRANSPARENT, SAID BARRIER BEING SLIGHTLY CONFORMABLE TO SAID MATERIAL WHEN PLACED THEREAGAINST, AND SAID BARRIER OF DIAMETER SUBSTANTIALLY THE SAME AS SAID HOUSING AND EXTENDING FORWARD THEREOF TO SEALABLY CLOSE THE OPPOSITE END OF SAID TUBULAR BODY MEMBER.