Covert selective acquisition device for identifying friend or fo

Details Covert selective acquisition device for identifying friend or fo Covert selective acquisition device for identifying friend or fo

1995-12-22

1999-02-09

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, 359159, 342 45, H04B 1000

Patent

active

058702156

ABSTRACT:
A compact infrared identification and communication assembly, including a transponder device and at least one interrogator device, is provided. Each device includes a housing having an opening therein through which light may be received or emitted. The opening has a spectral filter mounted therein which permits only a specific frequency band of incident light to pass into and out from the housing. A dichroic beam splitter is mounted in the housing, aligned with the spectral filter, for reflecting and transmitting separate selected portions of the specific frequency band. A photodiode is aligned with the beam splitter, thereby receiving light from one of the separate portions, for example the transmitted portion. The photodiode converts its received light into an electrical signal which is subsequently converted into a form which a user may easily understand, for example an LED display. The devices further include a light emitting diode, which is also aligned with said dichroic beam splitter, for converting a second electrical signal, produced by a user into an emitted light signal. The emitted light signal is of the other separate portion, for example the reflected range.

REFERENCES:
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patent: 4218834 (1980-08-01), Robertsson
patent: 4731879 (1988-03-01), Sepp et al.
patent: 4888816 (1989-12-01), Sica, Jr.
patent: 5329395 (1994-07-01), Endo et al.
patent: 5390040 (1995-02-01), Mayeux
patent: 5539565 (1996-07-01), Waddoups et al.

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