Annular accelerometer

• US 3,104,334 A
• Filed: 09/15/1959
• Issued: 09/17/1963
• Est. Priority Date: 09/15/1959
• Status: Expired due to Term

• Current Assignee: Bradley J.R. Wilson, Gunnar B. Bergman
• Original Assignee: Bradley J.R. Wilson, Gunnar B. Bergman
• Inventors: BRADLEY JR WILSON, Bergman, Gunnar B.
• Application Number:
  US03/840,089
• Time in Patent Office: 1,463 Days
• US Class Current: 310/329
• CPC Class Codes: G01L 1/16 using properties of piezoelectric devices
• CPC Class Codes: G01N 2291/02827 Elastic parameters, strength or force
• CPC Class Codes: G01P 15/0915 of the shear mode type

Claims

1. IN A TRANSDUCER, THE COMBINATION OF:

AN ANNULAR PIEZOELECTRIC ELEMENT HAVING A PAIR OF COAXIAL CYLINDRICAL SURFACES AT RADIALLY SPACED-APART POSITIONS, SAID PIEZOELECTRIC ELEMENT BEING ELECTRICALLY POLARIZED IN A DIRECTION PARALLEL TO ITS AXIS;

A PAIR OF MUTUALLY INSULATED ELECTRODES IN CONDUCTIVE CONTACT WITH SAID TWO CYLINDRICAL SURFACES OF SAID PIEZOELECTRIC ELEMENT;

FIRST AND SECOND MEMBERS SECURED RESPECTIVELY TO INNER AND OUTER SURFACE OF SAID PIEZOELECTRIC ELEMENT;

AND MEANS FOR MOVING ONE OF SAID MEMBERS RELATIVE TO THE OTHER IN A DIRECTION PARALLEL TO SAID AXIS WHERE-