Apparatus for detecting, identifying and recording the location of defects in a railway rail

In an ultrasonic testing device for detecting flaws in a railway rail having a rail head with a center line, a field side and a gauge side, the ultrasonic testing device comprising at least one tire mounted to be in rolling contact with the railway rail, at least one transducer mounted within the at least one tire, means connected to the at least one transducer for providing electrical signals for generation of at least one acoustic beam, and means connected to the at least one transducer for receiving electrical signals indicative of a reflected acoustic signal, and for processing the electrical signals to provide signals indicative of such flaws in such railway rail, wherein the improvement comprises:

• said at least one transducer mounted within the at least one tire at a position closer to the field side of the railway rail than the center line of the railway rail at a first angle of between 10 and 30 degrees from generally parallel to the center line from the field side to the gauge side of the rail head, and at a second angle of between 60 and 80 degrees from vertical;
• wherein said acoustic beam generated by said at least one transducer enters the rail head on the field side of the center line and continues across the rail head to the gauge side of the center line;
• and
• wherein said at least one transducer receives signals indicative of a reflected acoustic signal from said acoustic beam and outputs an electrical signal for processing.

In an ultrasonic testing device for detecting flaws in a railway rail having a rail head with a center line, a field side and a gauge side, the ultrasonic testing device comprising a first tire mounted to be in rolling contact with the railway rail, a second tire mounted to be in rolling contact with the railway rail at a position spaced from said first tire, a plurality of transducers mounted within the first and second tires, means connected to the plurality of transducers for providing electrical signals for generation of acoustic beams, and means connected to the plurality of transducers for receiving electrical signals indicative of reflected acoustic signals, and for processing the electrical signals to provide signals indicative of such flaws in such railway rail, wherein the improvement comprises:

• a first transducer mounted within the first tire at a position closer to the field side of the railway rail than the gauge side of the railway rail at a first angle of between 10 and 30 degrees from generally parallel to the center line from the field side to the gauge side of the rail head, and at a second angle of between 60 and 80 degrees from vertical, wherein said first transducer generates a first acoustic beam which enters the rail head on the field side of the center line and continues across the rail head to the gauge side of the center line, and wherein said first transducer receives signals indicative of a reflected acoustic signal from said first acoustic beam and outputs a first electrical signal for processing;
• a second transducer mounted within said first tire at a position generally parallel to the center line of said railway rail and proximal the field side of the railway rail at an angle of between 60 and 80 degrees from vertical, wherein said second transducer generates a second acoustic beam, receives signals indicative of a reflected acoustic signal from said second acoustic beam and outputs a second electrical signal for processing;
• a third transducer mounted within said first tire at a position generally parallel to the center line of said railway rail and proximal the gauge side of the railway rail at an angle of between 60 and 80 degrees from vertical, wherein said third transducer generates a third acoustic beam, receives signals indicative of a reflected acoustic signal from said third acoustic beam and outputs a third electrical signal for processing;
• a fourth transducer mounted within said first tire at a position generally collinear with the center line of said railway rail at an angle of between 60 and 80 degrees from vertical, wherein said fourth transducer generates a fourth acoustic beam, receives signals indicative of a reflected acoustic signal from said fourth acoustic beam and outputs a fourth electrical signal for processing;
• a fifth transducer mounted within the second tire at a position closer to the field side of the railway rail than the gauge side of the railway rail at a first angle of between 10 and 30 degrees from generally parallel to the center line from the field side to the gauge side of the rail head, and at a second angle of between 60 and 80 degrees from vertical and facing in a direction relative to the railway rail opposite said first transducer, wherein said fifth acoustic beam generated by said fifth transducer enters the rail head on the field side of the center line and continues across the rail head to the gauge side of the center line, and wherein said fifth transducer receives signals indicative of a reflected acoustic signal from said fifth acoustic beam and outputs a fifth electrical signal for processing;
• a sixth transducer mounted within said second tire at a position generally parallel to the center line of said railway rail and proximal the field side of the railway rail at an angle of between 60 and 80 degrees from vertical and facing in a direction relative to the railway rail opposite said second transducer, wherein said sixth transducer generates a sixth acoustic beam, receives signals indicative of a reflected acoustic signal from said sixth acoustic beam and outputs a sixth electrical signal for processing;
• a seventh transducer mounted within said second tire at a position generally parallel to the center line of said railway rail and proximal the gauge side of the railway rail at an angle of between 60 and 80 degrees from vertical and facing in a direction relative to the railway rail opposite said third transducer, wherein said seventh transducer generates a seventh acoustic beam, receives signals indicative of a reflected acoustic signal from said seventh acoustic beam and outputs a seventh electrical signal for processing;
• and
• an eighth transducer mounted within said second tire at a position generally collinear with the center line of said railway rail at an angle of between 60 and 80 degrees from vertical and facing in a direction relative to the railway rail opposite said fourth transducer, wherein said eighth transducer generates a eighth acoustic beam, receives signals indicative of a reflected acoustic signal from said eighth acoustic beam and outputs a eighth electrical signal for processing.