QA(2).docx

Questions and Answers

Q: Linear of matrix array probes?

A: Either will do as long as we can detect defects such as delaminations, voids, cracks, fiber breakage, etc. in the FRP materials described. We would like the ability to "steer" the beam so we can detect/measure the depth of a defect within a laminate as well as how deep within the laminate the defect begins at. More capability and clarity is better.

Q: Please identify the material: FRP is probably fiberglass but please verify E-Glass or S-Glass or other:

A: The fiber material could be either E-glass or S-glass. We envision the structures we will be inspecting to be mainly constructed with E-glass. However, we would like to be able to inspect either.

Q: Is there a known void %, if not are samples available to review?

A: There is no known void % since the structures that will be inspected have not been manufactured yet. There are no samples to review.

Q: Thickness is stated as 1" laminate thickness?

A: Correct. We would like to be able to inspect up to 1 in. thick of laminate material, regardless of whether the laminate is by itself or the facesheet of a sandwich panel.

Q: The term sandwich is also used what thickness is the laminate over the core materials and what is the core made of?

A: As answered previously, the laminate facesheet could be up to 1 in. thick. The core material is expected to be a polyisocyanate closed cell foam core with glass fabric wrapped around it to create shear webbing.

Q: How many channels 64 or 128?

A: The amount of channels available is not as important to us as being able to identify defects within the FRP composite material. Either channel number will be sufficient for us.

Q: Linear Array Ultrasonic system or Phased Array?

A: We have seen terms such as linear array, phased array, and matrix array. We are looking to be able to "steer" the beam in an attempt to see the depth dimension of a defect, not just where the defect lies within the depth of the laminate material. Whichever "named" array probe gives us the greatest flexibility and the most advantage to visualize a host of defects in a laminate and sandwich structure is what we would like to have.

Q: Does the end user want Roller probes?

A: We have used roller probes, we like roller probes, we would even encourage roller probes if they are available, but they are not a requirement. The most functional, easiest to use, and highest scanning rate probe is what would be appropriate.

Q: Will array probes with delays be acceptable also?

A: Array probes with our without delays are acceptable.

Q: How many elements are needed in each probe 64 or 128?

A: Like channel number, we are not so concerned with element numbers in a probe. We are looking for a total system that can assist in finding the smallest of defects, such as delaminations, voids, cracks, fiber breakage, etc., in the FRP materials described.

Q: Is the intended use of the system linear or matrix probes? Or both?

A: Either would be acceptable which is why we did not specify one or the other. We are looking for a system that will allow us to detect defects such as delaminations, voids, cracks, fiber breakage, etc. within the FRP materials described.

Q: If matrix probes are included, how many elements are intended to be fired with the matrix array?

A: We have no requirement on how many elements would be needed for any array probe. Whatever number will get the job done with respect to identifying a host of possible defects within the FRP materials described.