Strategic Blue-Green Communication Filters.
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
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The project began as an effort to construct narrowband, wide-field-of-view, large-aperture, plastic, birefringent filters suitable for blue-green communications. During the course of the study we investigated the use of crystalline materials in addition to plastic films, and we studied filter design theory in order to find designs more suitable to the blue-green system requirements. In addition, we constructed a quartz, 2A filter for the 1981 SLCAIR experiment. In this report we have included an introduction to the principles of narrowband, wide-field-of-view, birefringent filters. This section is included since the subject matter is not readily available except piecemeal in technical journals. Section III is a discussion of the materials which were considered during this study. It contains subsections devoted to crystals, plastics and analog element, respectively. A class of new lossless filter designs is described in Section IV. These designs are expected to provide a basis for high-transmission filters in the future. The operational SLCAIR-81 filter is described in Section V. It was part of the successful experiment which demonstrated communication to the USN Dolphin, a research submarine. Finally, in Section VI we describe the non-vignetting filter design which was discovered during this study. It represents a significant throughput advantage for crystal filters used in non-imaging applications.
- Non-Radio Communications