189 results about "Two dimensional detector" patented technology

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 monolithic patterned dichroic filter array is mounted on a wafer by combining microelectronic and microlithography techniques. A wafer is coated with a photoresist. The assembly is masked, and the unmasked photoresist, after exposure to ultraviolet light, is developed to expose a predetermined section. That section of wafer is then over developed to create an undercut in its walls and to expose the underlying wafer. Dichroic filter material is then deposited onto the wafer by a cold process, and the photoresist layer is then removed, leaving only the dichroic filter material on the wafer. The process is repeated to create an array. The finished wafer is then bonded to a linear or two dimensional detector array, or to a glass window that is then bonded to a linear or two dimensional detector, to create a high performance spectral detector for spectroscopic imaging. When placed on a two dimensional detector in a camera, an imaging system capable of showing spatial variation in color, chemicals or other spectrally dependent parameters is produced.

A portable, lightweight digital imaging device uses a slit scanning arrangement to obtain an image of the eye, in particular the retina. In at least one embodiment, a digital retinal imaging device includes an illumination source operable to produce a source beam, wherein the source beam defines an illumination pathway, a scanning mechanism operable to cause a scanning motion of the illumination pathway in one dimension with respect to a target, an optical element situated within the illumination pathway, the optical element operable to focus the illumination pathway into an illumination slit at a plane conjugate to the target, wherein the illumination slit is slit shaped, a first two dimensional detector array operable to detect illumination returning from the target and acquire one or more data sets from the detected illumination, wherein the returning illumination defines a detection pathway, and a shaping mechanism positioned within the illumination pathway, wherein the shaping mechanism shapes the source beam into at least one arc at a plane conjugate to the pupil. In at least one exemplary embodiment, the digital retinal imaging device is operable to minimize at least one aberration from the optical element or an unwanted reflection from the target or a reflection from a device.

A scalable imaging spectrometer, using anamorphic optical elements to form an intermediate focus in only one dimension. Light reflects off an object to form an incident beam. The beam reflects off an anamorphic objective mirror to form a line focus at a slit. At the slit, the beam is focused along the spectral dimension, but remains substantially collimated along the spatial dimension. The beam is then recollimated in the spectral dimension by a second anamorphic mirror, reflects off a diffraction grating, passes through a lens, and is brought to focus on a two dimensional detector, which produces both spectral and spatial information about the object. Because there is no intermediate focus in the spatial dimension, there are no off-axis aberrations from the anamorphic mirrors, and the field of view may be substantially increased over prior art spectrometers in the spatial dimension.