Probe for inspection of edges of a structure

1. An apparatus for inspecting a structure comprising:

a first housing defining at least one inlet for receiving a couplant;

a second housing defining a tapered chamber and an inner chamber, said inner chamber positioned to receive said couplant via said at least one inlet and dispense said couplant into said tapered chamber; and

a sensing element coupled to said first housing, said sensing element positioned above said tapered chamber, said tapered chamber configured to restrict the flow of said couplant as it flows out through an opening in said tapered chamber to maintain a column of couplant between said sensing element and an edge of a planar structure to be inspected as at least a portion of the sensing element overhangs the edge of the planar structure to be inspected.

2. The apparatus of claim 1 , wherein said couplant comprises water.

3. The apparatus of claim 1 , wherein said first housing and said second housing comprise Delrin®.

4. The apparatus of claim 1 , wherein said sensing element comprises an ultrasonic transducer.

5. The apparatus of claim 1 , wherein said sensing element comprises an array of ultrasonic transducers.

6. The apparatus of claim 1 , wherein said first housing further defines exit ports formed to allow said couplant to flow from said inner chamber and into said tapered chamber with reduced turbulence.

7. The apparatus of claim 1 , wherein said structure comprises a composite honeycomb structure.

8. An apparatus for inspecting a structure comprising:

an upper housing defining at least one inlet for receiving a flow of water;

a lower housing defining a tapered chamber and an inner chamber, said inner chamber positioned to receive said water via said at least one inlet and dispense said water into said tapered chamber; and

a linear array transducer coupled to said upper housing, said linear array transducer positioned above said tapered chamber, said tapered chamber configured to restrict the flow of said couplant as it flows out through an opening in said tapered chamber to maintain a column of water between said linear array transducer and an edge of a planar structure to be inspected as at least a portion of the linear array transducer is positioned to overhang an edge of the planar structure.

9. The apparatus of claim 8 , wherein said upper housing and said lower housing comprise Delrin®.

10. The apparatus of claim 8 , wherein said upper housing further defines exit ports formed to allow said water to flow from said inner chamber and into said tapered chamber with reduced turbulence.

11. The apparatus of claim 8 , wherein said structure comprises a composite honeycomb structure.

12. A method of inspection comprising:

positioning a probe having a sensing element on a surface of a planar structure having an edge;

moving the probe along the surface until a portion of the sensing element overhangs beyond the edge of the planar surface; and

maintaining substantially a column of couplant between said sensing element and said edge of the planar surface while the sensing element overhangs beyond the edge of the planar surface.

13. The method of claim 12 , wherein said couplant comprises water.

14. The method of claim 12 , wherein maintaining substantially the column of couplant between said probe and said surface while moving over the edge of the surface comprises transmitting signals into and receiving signals from the structure at various locations.

15. The method of claim 14 , wherein said various locations comprises an edge of the structure.