Apparatus and method for non-destructive testing
First Claim
1. A system for non-destructive testing of a bond in a bonded article, the system comprising:
- a laser configured to direct laser pulses onto a first surface of the bonded article and thereby induce the generation of a compressive stress waves in the bonded article that travel through the bond, the laser being further configured to direct the laser pulses in a probe-break-probe inspection sequence comprising a first laser pulse having a first fluence, a second laser pulse having a second fluence which is greater than the first fluence but less than a fluence required to break the bond, and a third laser pulse having a fluence which is approximately the same as the first fluence;
a gauge, at least a portion of the gauge being adjacent to a second surface of the bonded article;
a sensing coil adjacent to the gauge; and
a magnet capable of applying a magnetic field to the second surface.
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Accused Products
Abstract
A diagnostic means to enable real-time inspection of bonded structures. The disclosed apparatus detects bond failure stress waves on-axis from the front side (beam application side). Pi-box and pi-rail EMAT gauges can be used with the disclosed apparatus. An inductively coupled EMAT may also be employed. An improved means to remotely deliver an interrogating laser beam to a surface is provided. The process head may utilize a water column or a water film. The water film process head may include the use of either a single water film or two spaced apart water films. The disclosed apparatus can be used with bonded composite structures, bonded structures using various materials, and to determine the dynamic strength of unbonded solid materials. The apparatus may also be used in other applications that require remote flexible delivery of a localized stress wave to a material and/or diagnosis of the resultant stress waves.
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Citations
15 Claims
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1. A system for non-destructive testing of a bond in a bonded article, the system comprising:
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a laser configured to direct laser pulses onto a first surface of the bonded article and thereby induce the generation of a compressive stress waves in the bonded article that travel through the bond, the laser being further configured to direct the laser pulses in a probe-break-probe inspection sequence comprising a first laser pulse having a first fluence, a second laser pulse having a second fluence which is greater than the first fluence but less than a fluence required to break the bond, and a third laser pulse having a fluence which is approximately the same as the first fluence; a gauge, at least a portion of the gauge being adjacent to a second surface of the bonded article; a sensing coil adjacent to the gauge; and a magnet capable of applying a magnetic field to the second surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for non-destructive testing of a bond between a coating and a coated surface on a coated article, the system comprising:
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a laser configured to induce the generation of a compressive stress wave in the coated article, the laser further configured to direct laser pulses in a probe-break-probe inspection sequence at one or more locations on the coated article; a gauge, at least a portion of the gauge being adjacent to a surface of the coated article; a sensing coil adjacent to the gauge; and a magnet capable of applying a magnetic field to the surface. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification