Dual Field of View Annular Folded Optics with Switchable Mirrored Surface

An optical system that images a scene at two different fields of view, with switching between fields of view enabled by switchable mirrored surface is disclosed. The two fields of view vary in focal length by a factor of three. Both the wide field of view configuration and the narrow field of view c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Pixton Bruce M, Vizgaitis Jay N
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	An optical system that images a scene at two different fields of view, with switching between fields of view enabled by switchable mirrored surface is disclosed. The two fields of view vary in focal length by a factor of three. Both the wide field of view configuration and the narrow field of view configuration image broad-band short wave infrared radiation at an effective f/number of 1.4. A voltage change across the switchable mirror element generates a change in the reflection and transmission properties of the element, such that the element switches between a mirror state and a lens state. When nested in an annular reflective optic system of a given field of view, the switching element enables the opening of an additional optical path through the center of the reflective optics where a set of refractive optics are assembled into an imaging system for a second field of view. This dual field-of-view system changes field of view with no mechanical movement.