Method and apparatus for detecting flaws using ultrasonic helical waves

• US 3,299,694 A
• Filed: 03/26/1963
• Issued: 01/24/1967
• Est. Priority Date: 11/09/1961
• Status: Expired due to Term

• Current Assignee: Iii, Ben Wade Oakes Dickinson
• Original Assignee: Iii, Ben Wade Oakes Dickinson
• Inventors: DICKINSON III BEN WADE OAKES
• Application Number:
  US04/268,091
• Time in Patent Office: 1,400 Days
• US Class Current: 73/602
• CPC Class Codes: B06B 3/00 Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• CPC Class Codes: B23Q 17/09 for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool arrangements preventing overload of tools B23Q11/04; devices for indicating failure of drills during boring B23B49/00
• CPC Class Codes: G01N 2291/048 Transmission, i.e. analysed material between transmitter and receiver
• CPC Class Codes: G01N 29/07 by measuring propagation velocity or propagation time of acoustic waves
• CPC Class Codes: G01N 29/28 providing acoustic coupling , e.g. water impedance matching G10K11/02

Claims

1. IN A METHOD FOR INVESTIGATING FLAWS IN A MEMBER, INTRODUCING AT LEAST ONE ULTRASONIC WAVE TRAIN AT A PREDETERMINED GROUP VELOCITY INTO THE MEMBER, A PORTION OF THE WAVE TRAIN BEING DEFLECTED BY A FLAW TO PROVIDE AT LEAST TWO DEFLECTED WAVE TRAINS TRAVELLING IN DIRECTIONS DIFFERING FROM THE DIRECTION IN WHICH THE ULTRASONIC WAVE TRAIN IS INTRODUCED INTO THE MEMBER, MEASURING THE DIFFERENCE IN TIME OF TRAVEL OF THE TWO DEFLECTED WAVE TRAINS TO PREDETERMINED POINTS, AND DETERMINING AT LEAST ONE OF THE COORDINATES OF THE FLAW UTILIZING SAID DIFFERENCES IN TIME.