Flat bottom reference reflectors for ultrasonic inspection

Claim 2

A reference block for use in calibrating ultrasonic flaw detection test equipment, said block having a first relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block, the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from said large end surface and being of prescribed cross-sectional area from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, the two flat end surfaces of said block being parallel and being spaced apart a prescribed distance so that the block has a prescribed effective length.

Claim 3

A reference block as claimed in claim 1, in combination with a tubular member fitted about the portion of said block adjacent to its large end surface and having a portion projecting beyond said reflecting end so that said block may be supported by said projecting portion from a base structure with said reflecting end spaced from said base structure.

Claim 4

A reference block as claimed in claim 1 in which the portion of said block adjacent to its large end surface has a cylindrical cross-section and the tapered end of said block is conical.

Claim 5

A set of reference blocks for use in calibrating ultrasonic flaw detection test equipment, said set including at least three blocks each having a relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block with the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from its large end surface, said small surface of each block being parallel to its larger end surface and from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, said blocks having different lengths but having the same diameter reflecting end surfaces.

Claim 6

A set of reference blocks for use in calibrating ultrasonic flaw detection test equipment, said set including at least three blocks each having a relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block with the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from its large end surface, said small surface of each block being parallel to its larger end surface and from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, said blocks having different lengths but having the same diameter reflecting end surfaces.

Claim 7

A set of reference blocks as claimed in claim 4 and including a second group of three blocks generally similar to the first mentioned three blocks but having reflecting end surfaces of different diameter from that of said first mentioned three blocks.