Patent ID: 7770457

Claim:
An ultrasonic inspection reference standard for metallic interleaved composite laminates having porosity comprising: a member having at least one thickness, wherein said member is manufactured from a fiber-free photo-polymer resin using a stereo lithography process; at least one mesh; and at least one metallic shim; wherein at least one of: (a) said reference standard contains at least one of the acceptable and rejectable ultrasonic properties of a metallic interleaved composite laminate having porosity; (b) one or more of the type, location, diameter, mesh range, percentage of open area, and spacing of said at least one mesh is predetermined prior to manufacture of said reference standard to provide said reference standard with at least one of the acceptable and rejectable ultrasonic properties of said metallic interleaved composite laminates having porosity; (c) one or more of the type, size, configuration, location, spacing, and material of said at least one metallic insert is predetermined prior to manufacture of said reference standard to provide said reference standard with at least one of the acceptable and rejectable ultrasonic properties of said metallic interleaved composite laminates having porosity; (d) said reference standard is used to inspect a metallic interleaved composite laminate part of an aircraft structure; and (e) said at least one metallic shim is made of Titanium.