Covert selective acquisition device for identifying friend or foe
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-010/00
출원번호
US-0577990
(1995-12-22)
발명자
/ 주소
Milano Steven J.
Herzel James S.
출원인 / 주소
Northrop Grumman Corporation
대리인 / 주소
Anderson
인용정보
피인용 횟수 :
27인용 특허 :
7
초록▼
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 w
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.
대표청구항▼
[ We claim:] [1.] An infrared identification and communication assembly, including at least two devices, each of which comprises:a housing having a light receiving opening therein;a spectral filter, mounted within said light receiving opening, which permits a frequency bandwidth of incident light to
[ We claim:] [1.] An infrared identification and communication assembly, including at least two devices, each of which comprises:a housing having a light receiving opening therein;a spectral filter, mounted within said light receiving opening, which permits a frequency bandwidth of incident light to enter into and exit from said housing, said bandwidth including first and second frequencies, wherein one of said first and second frequencies comprises a transmitted frequency and the other of the first and second frequencies comprises a received frequency;a dichroic beam splitter, mounted in optical receiving alignment with said spectral filter, for reflecting and passing therethrough selected portions of said frequency bandwidth, wherein said selected portions which are reflected include one of said first and second frequencies, and said selected portions which pass therethrough include the other of the first and second frequencies;a photodiode, mounted in optical receiving alignment with said dichroic beam splitter, for receiving said received frequency, and converting same into a first electrical signal;a solar noise rejection circuit, through which circuit the first electrical signal is directed, which includes a pair of amplifiers coupled via a feedback loop whereby constant level solar noise components of the first electrical signal are subtracted therefrom;means by which a user may produce a second electrical signal; anda light emitting diode, aligned in light transmitting alignment with said dichroic beam splitter, for converting said second electrical signal into a light signal comprising the transmitted frequency, and emitting said light signal through said spectral filter and out of said housing in a narrow beam.
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이 특허에 인용된 특허 (7)
Waddoups Ray O. (Mesa AZ) Scavarda John S. (Fountain Hills AZ), Method and apparatus for a selective optical retroreflector.
Mateti, Kiron; Boyke, Taylor; Boyd, Christopher, Methods and systems for identification and communication using free space optical systems including wearable systems.
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