Phase sensitive spectrum analyzer

An acousto-optic processing arrangement which determines the direction of arrival of energy of energy applied thereto, said arrangement comprising:

• a laser source;
• a first lens disposed to focus the collimated laser light provided by said first lens;
• a detector array disposed at the focal plane of said second lens;
• two surface acoustic wave transducers disposed between said first and second lenses and adjacent to an optical path between said lenses, said two surface acoustic wave transducers being disposed adjacent to one another and disposed such that the surface acoustic waves radiated thereby are substantially parallel to one another;
• two antennas, each antenna being individually coupled by means of separate downconverters to one of said surface acoustic wave transducers, said antennas being disposed so as to have their respective lines-of-sight substantially parallel to one another;
• and
• computer means coupled to said detector array for determining the direction of arrival of said applied energy;
• whereby in response to energy applied to said two transducers, said arrangement provides signals which are indicative of the direction of arrival of said applied energy.

An acoustic-optic processing arrangement for determining the direction of arrival of energy applied thereto, said arrangement comprising:

• a laser source;
• an integrated circuit chip having a surface layer capable of transmitting light from said laser source, disposed to receive light from said laser source;
• a first lens disposed in said surface layer to collimate laser light provided by said laser source;
• a second lens disposed in said surface layer to focus the collimated laser light provided by said first lens;
• a detector array disposed at the focal plane of said second lens;
• two surface acoustic wave transducers disposed between said first and second lenses on said surface and adjacent to an optical path between said lenses, said two surface acoustic wave transducers being disposed adjacent to one another and disposed such that the surface acoustic waves radiated thereby are substantially parallel to one another;
• two antennas, each antenna being individually coupled by means of separate downconverters to one of said surface acoustic wave transducers, said antennas being disposed so as to have their respective lines-of-sight substantially parallel to one another;
• and
• computer means coupled to said detector array for determining the direction of arrival of said applied energy.

An acousto-optic processing arrangement for determining the direction of arrival of energy applied thereto, said arrangement comprising:

• a laser source;
• an integrated circuit chip having a surface layer capable of transmitting light from said laser source, disposed to receive light from said laser source;
• a first lens disposed in said surface layer to collimate laser light provided by said laser source;
• a second lens disposed in said surface layer to focus the collimated laser light provided by said first lens;
• a detector array disposed at the focal plane of said second lens;
• two surface acoustic wave transducers disposed between said first and second lenses on said surface and adjacent to an optical path between said lenses, said two surface acoustic wave transducers being disposed adjacent to one another and disposed such that the surface acoustic waves radiated thereby are substantially parallel to one another;
• two antennas, each antenna being individually coupled by means of separate downconverters to one of said surface acoustic wave tranducers, said antennas being disposed so as to have their respective lines-of-sight substantially parallel to one another;
• and
• computer means coupled to said detector array for determining the direction of arrival of said applied energy;
• whereby in response to energy applied to said two transducers, said arrangement provides signals which are indicative of the direction of arrival of said applied energy.

An acoustic-optic processing arrangement including:

• an integrated optic spectrum analyzer disposed on an integrated circuit chip, said spectrum analyzer comprising a laser source, a first lens disposed so as to collimate laser light provided by said laser source, a second lens disposed so as to focus light transmitted by said first lens, a detector array disposed at the focal plane of said second lens for converting optical signals into electrical signals, and a first acoustic wave transducer disposed between said first and second lenses adjacent to an optical path therebetween, wherein the improvement comprises:
• a second acoustic wave transducer disposed between said first and second lenses adjacent to said optical path and adjacent to said first acoustic wave transducer such that acoustic waves provided thereby are substantially parallel to acoustic waves provided by said first acoustic wave transducer, the acoustic waves provided by said first and second transducers substantially interacting with light provided by said laser source so as to provide two separately diffracted beams therefrom, said diffraction being a function of the amplitude and frequency of input signals applied to said transducers, said two beams causing an interference pattern having at least two main sidelobes in the signals provided by said detector array, the relative intensities of said two main sidelobes being indicative of the relative phase difference between the signals applied to said two surface acoustic wave transducers;
• two antennas having their respective lines-of-sight orieted substantially to one another and having their outputs coupled to respective inputs of said first and second surface acoustic wave transducers by means of separate downconverters, said antennas providing said applied signals to said surface acoustic wave transducers;
• and
• computer means coupled to said detector array for determining the direction of arrival of energy applied to said arrangement.