Title: Passive optical transponder

Abstract: An optical identification and communication system wherein an interrogator sends out a broad illuminator beam outside the visible range. Some of this radiation is collected by the transponder optic and focused on a converting phosphor. The response light is recollimated by the transponder optic and transmitted directly back at the interrogator. The use of co-axial optics along with color filters and an electronic "shutter" in the interrogator enables the transmitted and received radiation to be separated.

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Inventors: Salonimer, David J. (Huntsville, AL, US)
Kelley, Buster E. (Huntsville, AL, US)

Application Number: 024917
Filing Date: 1970-03-19
Publication_date: 1977-09-20
Assignee: The United States of America as represented by the Secretary of the Air (Washington, DC)
Primary Class(es): 250/458.1 398/108, 398/169
Other Classes:
US Patent Ref:

1385657	Jul, 1921	Bell et al.	250/71.
2334765	Nov, 1943	Hermann	250/77.
2417384	Mar, 1947	Switzer	250/71.
2519825	Aug, 1950	DeMent	250/71.
2653109	Sep, 1953	Switzer	250/71.
3305633	Feb, 1967	Chernoch	250/199.
3380358	Apr, 1968	Neumann	356/5.

Other Refs: 519,901

Apr, 1940	UK

Primary Examiner: Padgett, Benjamin R.
Assistant Examiner: Kyle, Deborah L.
Attorney: Rusz; Joseph E., Tashjian; Arsen