Ultrasonic signal coupler

1. An ultrasonic waveguide assembly comprising:

a pipe having an exterior surface and an interior surface, the interior surface defining an inside diameter of the pipe which comprises fluid traveling therethrough;

a first ultrasonic waveguide penetrating the exterior surface of the pipe and the interior surface of the pipe at a first location such that the first ultrasonic waveguide is in direct contact with the fluid traveling therethrough, wherein the first ultrasonic waveguide comprises two end surfaces and two side surfaces arranged between the end surfaces and spaced apart along a longitudinal axis of the pipe such that the two side surfaces are substantially parallel, and each of the side surfaces of the first ultrasonic waveguide contacts the pipe at an acute angle to the longitudinal axis of the pipe;

a first ultrasonic transducer adapted to be acoustically coupled to a top end of the first ultrasonic waveguide at an acute angle such that the top end of the first ultrasonic waveguide is parallel to the longitudinal axis of the pipe;

a second ultrasonic waveguide penetrating the exterior surface of the pipe and the interior surface of the pipe at a second location such that the second ultrasonic waveguide is in direct contact with the fluid traveling therethrough, wherein the second ultrasonic waveguide comprises two end surfaces and two side surfaces arranged between the end surfaces and spaced apart along a longitudinal axis of the pipe such that the two side surfaces are substantially parallel, and each of the side surfaces of the second ultrasonic waveguide contacts the pipe at an acute angle to the longitudinal axis of the pipe; and

a second ultrasonic transducer adapted to be acoustically coupled to a top end of the second ultrasonic waveguide at an acute angle such that the top end of the second ultrasonic waveguide is parallel to the longitudinal axis of the pipe.

2. The ultrasonic waveguide assembly of claim 1 , wherein the first location and the second location are about 180 degrees around the pipe apart.

3. The ultrasonic waveguide assembly of claim 1 , wherein the first and second ultrasonic waveguides each penetrate the pipe at an acute angle with respect to a longitudinal axis of the pipe.

4. The ultrasonic waveguide assembly of claim 1 , wherein the first and second ultrasonic waveguides each comprise an axis and the axes of the first and second ultrasonic waveguide are collinear.

5. The ultrasonic waveguide assembly of claim 1 , wherein the first and second ultrasonic waveguides each comprise a length and a width, and wherein each of the lengths is greater than a corresponding one of the widths.

6. The ultrasonic waveguide assembly of claim 5 , wherein the first and second ultrasonic waveguides each further comprise a thickness and wherein each of the lengths is greater than a corresponding one of the thicknesses.

7. The ultrasonic waveguide assembly of claim 1 , wherein at least one of the first and second ultrasonic waveguides protrude into an interior of the pipe.

8. The ultrasonic waveguide assembly of claim 1 , wherein the first and second ultrasonic waveguides are each made from carbon steel, stainless steel, or a combination thereof.

9. The ultrasonic waveguide assembly of claim 1 , wherein each of the first and second ultrasonic transducers emit ultrasonic signals that are detected by the other one of the first and second ultrasonic transducers.

10. The ultrasonic waveguide assembly of claim 1 , wherein the first location and the second location are less than 180 degrees around the pipe apart.

11. The ultrasonic waveguide assembly of claim 1 , wherein at least one of the first and second ultrasonic waveguides terminates flush with an interior surface of the pipe.

12. An ultrasonic waveguide assembly comprising:

a pipe having an exterior surface, an interior surface, and a pipe axis, the interior surface defining an inside diameter of the pipe which comprises fluid traveling therethrough in a direction substantially parallel with the pipe axis;

a first ultrasonic waveguide penetrating the exterior surface of the pipe and the interior surface of the pipe at a first location such that the first ultrasonic waveguide is in direct contact with the fluid traveling therethrough, wherein the first ultrasonic waveguide comprises a first waveguide length, a first waveguide width, and a first waveguide axis, the first ultrasonic waveguide penetrates the pipe such that the first waveguide axis forms an acute angle with respect to the pipe axis, the first waveguide length is greater than the first waveguide width, the first ultrasonic waveguide comprises two end surfaces and two side surfaces arranged between the end surfaces and spaced apart along a longitudinal axis of the pipe such that the two side surfaces are substantially parallel, and each of the side surfaces of the first ultrasonic waveguide contacts the pipe at an acute angle to the longitudinal axis of the pipe;

a first ultrasonic transducer adapted to be acoustically coupled to a top end of the first ultrasonic waveguide at an acute angle such that the top end of the first ultrasonic waveguide is parallel to the longitudinal axis of the pipe;

a second ultrasonic waveguide penetrating the exterior surface of the pipe and the interior surface of the pipe at a second location such that the second ultrasonic waveguide is in direct contact with the fluid traveling therethrough, wherein the second ultrasonic waveguide comprises a second waveguide length, a second waveguide width, and a second waveguide axis, the second ultrasonic waveguide penetrates the pipe such that the second waveguide axis forms an acute angle with respect to the pipe axis, the second waveguide length is greater than the second waveguide width, the second waveguide axis is collinear with the first waveguide axis, the second ultrasonic waveguide comprises two end surfaces and two side surfaces arranged between the end surfaces and spaced apart along a longitudinal axis of the pipe such that the two side surfaces are substantially parallel, and each of the side surfaces of the second ultrasonic waveguide contacts the pipe at an acute angle to the longitudinal axis of the pipe; and

a second ultrasonic transducer adapted to be acoustically coupled to a top end of the second ultrasonic waveguide at an acute angle such that the top end of the second ultrasonic waveguide is parallel to the longitudinal axis of the pipe.

13. The ultrasonic waveguide assembly of claim 12 , wherein the first location and the second location are about 180 degrees around the pipe apart.

14. The ultrasonic waveguide assembly of claim 12 , wherein at least one of the first and second ultrasonic waveguides protrude into an interior of the pipe.

15. The ultrasonic waveguide assembly of claim 12 , wherein at least one of the first and second ultrasonic waveguides terminates flush with an interior surface of the pipe.

16. An ultrasonic waveguide assembly comprising:

a pipe having an exterior surface, an interior surface, and a pipe axis, the interior surface defining an inside diameter of the pipe which comprises fluid traveling therethrough in a direction substantially parallel with the pipe axis;

a first ultrasonic waveguide penetrating the exterior surface of the pipe and the interior surface of the pipe, and protruding into an interior of the pipe at a first location such that the first ultrasonic waveguide is in direct contact with the fluid traveling therethrough, wherein the first ultrasonic waveguide comprises a first waveguide length, a first waveguide thickness, and a first waveguide axis, the first ultrasonic waveguide penetrates the pipe such that the first waveguide axis forms an acute angle with respect to the pipe axis, the first waveguide length is greater than the first waveguide thickness, the first ultrasonic waveguide comprises two end surfaces and two side surfaces arranged between the end surfaces and spaced apart along a longitudinal axis of the pipe such that the two side surfaces are substantially parallel, and each of the side surfaces of the first ultrasonic waveguide contacts the pipe at an acute angle to the longitudinal axis of the pipe;

a first ultrasonic transducer adapted to be acoustically coupled to a top end of the first ultrasonic waveguide at an acute angle such that the top end of the first ultrasonic waveguide is parallel to the longitudinal axis of the pipe;

a second ultrasonic waveguide penetrating the exterior surface of the pipe and the interior surface of the pipe, and protruding into an interior of the pipe at a second location such that the second ultrasonic waveguide is in direct contact with the fluid traveling therethrough, wherein the second ultrasonic waveguide comprises a second waveguide length, a second waveguide thickness, and a second waveguide axis, the second ultrasonic waveguide penetrates the pipe such that the second waveguide axis forms an acute angle with respect to the pipe axis, the second waveguide length is greater than the second waveguide thickness, the second ultrasonic waveguide comprises two end surfaces and two side surfaces arranged between the end surfaces and spaced apart along a longitudinal axis of the pipe such that the two side surfaces are substantially parallel, and each of the side surfaces of the second ultrasonic waveguide contacts the pipe at an acute angle to the longitudinal axis of the pipe; and

a second ultrasonic transducer adapted to be acoustically coupled to a top end of the second ultrasonic waveguide at an acute angle such that the top end of the second ultrasonic waveguide is parallel to the longitudinal axis of the pipe.

17. The ultrasonic waveguide assembly of claim 16 , wherein the first location and the second location are less than 180 degrees around the pipe apart.

18. The ultrasonic waveguide assembly of claim 16 , wherein at least one of the first and second ultrasonic waveguides terminates flush with an interior surface of the pipe.

19. The ultrasonic waveguide assembly of claim 17 , wherein the first waveguide axis is collinear with the second waveguide axis.