Method and apparatus for generating and receiving ultrasonic helical waves

• US 3,186,216 A
• Filed: 11/09/1961
• Issued: 06/01/1965
• Est. Priority Date: 11/09/1961
• Status: Expired due to Term

• Current Assignee: Oakes Dickinson Ben Wade
• Original Assignee: Oakes Dickinson Ben Wade
• Inventors: OAKES DICKINSON BEN WADE
• Application Number:
  US04/151,331
• Time in Patent Office: 1,300 Days
• US Class Current: 73/627
• 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 THE NON-DESTRUCTIVE TESTING OF TUBULAR OBJECTS TO DETERMINE THE EXISTENCE AND LOCATION OF FLAWS IN THE TUBULAR OBJECT, INTRODUCING AN ULTRASONIC WAVE TRAIN INTO THE WALL OF THE TUBULAR OBJECT AT AN ANGLE TO THE LONGITUDINAL AXIS AND A TRANSVERSE PLANE OF THE TUBULAR OBJECT SO THAT THE WAVE TRAIN TRAVELS IN A HELICAL PATH IN THE WALL OF THE TUBULAR OBJECT, A PORTION OF THE ULTRASONIC WAVE TRAIN INTRODUCED INTO THE WALL OF THE TUBULAR OBJECT BEING REFLECTED BY THE FLAW IN THE TUBULAR OBJECT TO PROVIDE A REFLECTED ULTRASONIC WAVE TRAIN TRAVELLING IN THE OBJECT IN A DIRECTION OR HAND WHICH IS OPPOSITE TO THE DIRECTION OF TRAVEL OF THE INTRODUCED ULTRASONIC WAVE TRAIN, SCANNING THE TUBULAR OBJECT AT A POSITION SPACED FROM THE POSITION IN WHICH THE ULTRASONIC WAVE TRAIN IS INTRODUCED INTO THE TUBULAR OBJECT UNTIL A REFLECTED HELICAL WAVE TRAIN IS RECEIVED, ABSORBING ANY UNREFLECTED WAVE TRAINS BEING RECEIVED IN THE VICINITY OF THE REFLECTED WAVE TRAIN, RECEIVING ONLY REFLECTED HELICAL WAVE TRAINS, AND DETERMINING THE ANGLE AT WHICH THE REFLECTED WAVE TRAIN IS A MAXIMUM.

6. IN APPARATUS FOR USE IN THE NON-DESTRUCTIVE TESTING OF A TUBULAR OBJECT TO DETERMINED THE EXISTANCE OR LOCATION OF FLAWS IN THE TUBULAR OBJECT, MEANS FOR INTRODUCING AN UNTRASONIC WAVE TRAIN INTO THE TUBULAR OBJECT AT AN ANGLE TO A LONGITUDINAL AXIS AND A TRANSVERSE PLANE OF THE TUBULAR OBJECT SO THAT THE ULTRASONIC WAVE TRAIN TRAVELS IN A HELICAL