10162 results about "Diffraction" patented technology

A dual-band antenna is provided that combines two normally disparate communications modes into a single compact aperture minimizing overall mass and volume, while maintaining high performance efficiency and reciprocity of each individual mode. The antenna is compatible with both optical (near-IR / visible) and RF (microwave / millimeter-wave) transceiver subsystems for high bandwidth communications, applicable primarily to long- to extremely long-range (space-to-ground) link distances. The optical link provides high bandwidth while the RF provides a lower data-rate weather backup, accommodation for traditional navigation techniques, and assistance in cueing the extremely tight optical beam by matching the RF beamwidth to an optical fine-steering mechanism field-of-regard. The configuration is built around a near-diffraction-limited high performance primary mirror shared by both a direct-fed RF antenna design and a Cassegrain optical telescope. Material properties are exploited to combine the optical secondary mirror with the RF feed structure, providing a collimated optical beam interface at the antenna vertex.

An imaging system / camera consisting of multiple nano-sized optical elements arranged in an array format with more than one pixel per optical element will have a higher resolution than each element would be capable of individually, since each element being at a different point gathers slightly different overlapping information. Hence by processing such information one can obtain a clear image. Furthermore multiple information from sectors of an array of sensors can be processed to obtain 3-D, stereotypic and panoramic imaging and may be connected to each other allowing seeing around obstacles as well as enabling full 3-D tracking and / or metric determination of an unknown object. Color / spectroscopic imaging can be achieved by utilizing equally sized lenses and multi-wavelength sensing layers below the lenses. However, color / spectroscopic imaging and / or spectroscopy can be achieved by taking advantage of unique optical properties of nano-scaled lenses accepting various wavelengths below their diffraction limits.

A spectral-domain optical coherence tomography system using a cross-dispersed spectrometer is disclosed. The interfered optical signal is dispersed by a grating into several orders of diffraction, and these orders of diffraction are separated by an additional dispersive optical element. The spectral interferogram is recorded by a set of linear detector arrays, or by a two-dimensional detector array.

A cordierite ceramic body having (i) a pore size distribution and a porosity which satisfy the relationship 10.2474 / [(d50)2(pore fraction)]+0.0366183(d90)−0.00040119(d90)2+0.468815(1 / pore fraction)2+0.0297715(d50)+1.61639(d50−d10) / d50≦3.65, and (ii) a CTE (25°-800° C.) of ≦15×10−7 / ° C., wherein the cordierite ceramic body is produced from a moldable mixture comprising cordierite-forming raw materials including (a) a fine talc having a median particle diameter, as measured by laser diffraction, of less than 10 micrometers, and a B.E.T. specific surface area of greater than 5 m2 / g, and (b) a pore former. The cordierite ceramic body is suitable in the fabrication of cellular, wall-flow diesel particulate filters having a low pressure drop, high filtration efficiency and improved strength.