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| Transceiver algorithms of antenna arrays |
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| Adaptive channel allocation in a frequency division multiplexed system |
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Device and method for monitoring the presence of an object in space
| Details |
Inventors: Miller, Jr., Walter E.; Mitchell, Robert R.; Lovelace, Donald E.;
Assignee: The United States of America as represented by the Secretary of the Army (Washington, DC)
Primary Examiner: Jordan; Charles T.
Assistant Examiner:
Attorney, Agent or Firm: Bush; Freddie M., Chang; Hay Kyung
An optically transparent cylinder having a hemispherical cavity at one end hereof and containing at least one light source and one light detector inside the hemispherical cavity utilizes the prismatic effect of the cylinder to locate an object in space. The light source and detector are located on a disk whose insertion depth into the cavity and tilt angle inside the cavity can be varied to control the sharpness, width and direction of the conical beam output from the cylinder, the beam searching the space for the location of the desired object. |
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DETAILED DESCRIPTION We claim: 1.
A device for detecting the presence of an object in space, comprising: a solid, optically transparent cylinder having a top and a base, said cylinder further having a cavity at said base, a disk positioned inside said cavity, said disk having a first surface and a second surface, a means to support said disk inside said cavity, a means to control the insertion depth of said disk within said cavity, a means to tilt said disk in any plane that intersects the vertical axis of said cylinder, light emitting apparatus to emit laser light outwardly toward space, detecting apparatus to receive light impinging thereon, said light being reflected from an object in space, said emitting apparatus and detecting apparatus being mounted on said first surface of said disk.
2.
A device as set forth in claim 1, wherein said cavity is hemispherical.
3.
A device as set forth in claim 2, wherein said supporting means is a plurality of rods positioned for movement inside said cavity in parallel with the vertical axis of said cylinder, said rods having tops and bottoms, said tops suitably coupled to said second surface of said disk and said control means is a drive motor coupled to each of said bottoms of said rods to vary insertion depth of said rods within said cavity.
4.
A device as set forth in claim 3, wherein said light emitting apparatus further comprises a plurality of laser diodes to produce laser light, a laser driver coupled to said laser diodes to supply appropriate power to said laser diodes and collimating lenses suitably positioned in the path of the light emitted by said laser diodes to collimate said laser light.
5.
A device as set forth in claim 4, wherein said light detecting apparatus further comprises detectors to receive light incident thereon, focusing lenses positioned between incident light and said detectors to focus the light before the light impinges on said detectors, a pre-amplifier coupled to said detectors to strengthen the light received by said detectors, and a comparator coupled to said pre-amplifier to distinguish between background illumination and light reflected from an object in space
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