Acoustic waveguide plate
An acoustic (sound or ultrasound) wave transmitter having a plurality of waveguides is described, and a method of making such a transmitter is described. Each waveguide may have a cladded core. The cladded core is capable of transmitting acoustic wave energy from a first end surface to a second end surface of the cladded core. The waveguides may be substantially fixed relative to each other by a binder. The binder may be formed by fusing the claddings together, potting a material between the waveguides and/or mechanically holding the waveguides.
1. An acoustic wave transmitter, comprising:
a plurality of waveguides, each waveguide having a core and cladding, the core having (a) a first end surface, (b) a second end surface, and (c) a longitudinal surface extending between the first and second end surfaces, the longitudinal surface being substantially surrounded by the cladding to form a cladded core, wherein the core is a material having a first shear-wave propagation velocity (“SWPV”) and the core is selected from the group consisting of polystyrene and polymethylmethacrylate, and the cladding is a material having a second shear-wave propagation velocity and the cladding is selected from the group consisting of polystyrene, polycarbonate and glass, and wherein the second SWPV is greater than the first SWPV;
a binder holding the waveguides so as to substantially fix each waveguide relative to the other waveguides.
2. The wave transmitter of claim 1 , wherein the waveguides are substantially the same length.
3. The wave transmitter of claim 1 , wherein the first end surfaces of the waveguides lie substantially in a plane.
4. The wave transmitter of claim 1 , wherein the second end surfaces of the waveguides lie substantially in a plane.
5. The wave transmitter of claim 1 , wherein the binder is a material substantially the same as the material used for the cladding.
6. The wave transmitter of claim 5 , wherein the cladding material also serves as the binder, and the binder has been formed by fusing the cladding of a first waveguide to the cladding of a second waveguide.
7. The wave transmitter of claim 1 , wherein the binder has been potted to interstices between the waveguides.
8. The wave transmitter of claim 1 , wherein the core is polymethylmethacrylate and the cladding is polystyrene.
9. The wave transmitter of claim 1 , wherein the core is polystyrene and the cladding is glass.
10. A method of making an acoustic wave transmitter, comprising:
providing a plurality of waveguides each having a core and cladding, wherein,
(a) the core has (a) a first end surface, (b) a second end surface, and (c) a longitudinal surface extending between the first and second end surfaces, the core having a first shear-wave propagation velocity (“SWPV”) and the core is selected from the group consisting of polystyrene and polymethylmethacrylate;
(b) the cladding substantially surrounds the core to form a cladded core, the cladding having a second SWPV and the cladding is selected from the group consisting of polystyrene, polycarbonate and glass, wherein the second SWPV is greater than the first SWPV;
binding the waveguides so as to substantially fix each waveguide relative to the other waveguides.
11. The method of claim 10 , wherein the waveguides that are provided are made substantially the same length by cutting the waveguides to a desired length.
12. The method of claim 10 , wherein binding is carried out by heating the wave guides to fuse the cladding of at least one waveguide to the cladding of another waveguide.
13. The method of claim 10 , wherein binding is carried out by placing a potting material between the waveguides.
14. The method of claim 10 , wherein binding is carried out by placing a band around the plurality of waveguides.
15. The method of claim 10 , further comprising cutting the bound waveguides so that the first end surfaces of the waveguides lie substantially in a plane.
16. The method of claim 15 , further comprising cutting the bound waveguides so that the second end surfaces of the waveguides lie substantially in a plane.
17. The method of claim 10 , wherein the core is polymethylmethacrylate and the cladding is polystyrene.
18. The method of claim 10 , wherein the core is polystyrene and the cladding is glass.