Wave transmission lines and networks – Coupling networks – Delay lines including elastic bulk wave propagation means
Patent
1986-05-28
1987-08-04
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic bulk wave propagation means
333142, H03H 936
Patent
active
046849068
ABSTRACT:
There is disclosed a solid ultrasonic delay line comprising a solid ultrasonic delay medium on which polygonal multiple-reflective surfaces are formed. An input transducer for radiating longitudinal waves is disposed on one of the reflective surfaces. The longitudinal waves are transformed into transverse waves by other one of the reflective surfaces and then reconverted by yet other one of the reflective surfaces into longitudinal waves which enter an output transducer disposed on still other one of the reflective surfaces. Ultrasound absorbers cover at least portions of the main boundary surfaces perpendicular to the reflective surfaces. Spurious waves of the longitudinal waves radiated from the input transducer are transformed by the main boundary surfaces into transverse waves which enter the absorbers. In addition to, or instead of, the absorbers, ultrasound diffuse reflection regions are formed on at least portions of the main boundary surfaces perpendicular to the reflective surfaces, in order to cause the spurious waves of the longitudinal waves from the input transducer to be diffusely reflected at the main boundary surfaces.
REFERENCES:
patent: 3611200 (1971-10-01), Sliepenbeek et al.
patent: 4016512 (1977-04-01), Wauk, II
patent: 4525692 (1985-06-01), Claes
Nussbaum Marvin L.
Showa Electric Wire & Cable Co. Ltd.
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