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US 4,055,820 AGranted
Reflective dot array for acoustic wave processing
AssigneeSperry Rand Corporation
InventorLeland P. Solie
Life of this patent
Estimating the term…
Abstract
An apparatus for processing acoustic signals wherein an array of discrete scatterers on a substrate reflect an incident acoustic surface wave on the substrate in accordance with a predetermined transfer function which is established by the size and spacing of the scatterers within the array. The scatterers, and input and output transducers, may all be metalized on the surface of the substrate with a single mask, thus providing an economical means of construction.
Claims25
An apparatus for processing acoustic waves comprising:
- a substrate capable of supporting surface acoustic waves on a surface thereof;
- an input transducer for launching acoustic waves in a predetermined propagation direction on said surface;
- an array formed by a multiplicity of discrete scatterers on said surface, each of which is of dimensions that are less than a wavelength of said launched acoustic waves and positioned to scatter surface acoustic waves launched in said predetermined direction, said scattered acoustic waves contributing to the formation of reflected surface waves, that propagate at a preselected angle relative to said propagation direction, which are related to said launched acoustic waves through a transfer function that is substantially defined by the dimensions of said scatterers and their relative positioning within said array;
- and
- an output transducer for receiving said reflected surface waves.
2 more elements
An apparatus for processing acoustic waves comprising:
- a substrate capable of supporting acoustic waves on a surface thereof;
- an input transducer for launching surface acoustic waves in a predetermined propagation direction on said surface;
- an array formed with a multiplicity of discrete scatterers on said surface, said scatterers positioned to form lines which include a plurality of said scatterers, all lines so formed being at a predetermined angle relative to said propagation direction and parallel with predetermined spacings therebetween, the number and dimensions of said scatterers on a line determining the percentage of incident acoustic wave energy reflected therefrom, thereby establishing a weighting factor for acoustic waves reflected from said line which combines with reflected acoustic waves from all other lines of said scatterers at a preselected angle of reflection from said lines, thereby establishing acoustic waves at said preselected angle possessing a prespecified relationship to said acoustic waves launched in said predetermined direction;
- and
- an output transducer for receiving said reflected acoustic waves.
2 more elements
Dependencies are inferred from the claim text.