摘要:
An infrared refractive reimaging afocal telescope (10) has an objective lens group (12), an eyepiece lens group (14), and a switching lens group (16). The system (10) provides a plurality of magnification modes in a compact arrangement. The system (10) utilizes lenses (40, 42, 44, 46) with diffractive surfaces to provide for magnification changes and chromatic aberration correction. The system provides for excellent image quality in all modes using a minimum number of lens elements.
摘要:
An infrared imaging optical system for focusing infrared radiation on an infrared detector, including: a front lens group having a negative optical power to receive infrared radiation and including a first front lens and a second front lens each with at least one aspherical surface; an intermediate lens group that receives the infrared radiation from the front lens group and includes a first intermediate lens, a second intermediate lens, and a third intermediate lens each with at least one aspherical surface; and a rear lens group having positive optical power, wherein the rear lens group receives the infrared radiation from the intermediate lens group and includes a first rear lens and a second rear lens each with at least one aspherical surface, and a third rear lens, wherein the imaging optical system has a stop between the rear lens group and a focal plane at said infrared detector.
摘要:
A wide field-of-view infrared optical imaging system with extended spectral coverage into the 1.0 to 2.5 μm wavelength range. In one example, an optical imaging system includes an imaging detector sensitive to light in a wavelength range of at least 1.0 μm to 5.0 μm, and a plurality of lenses optically coupled together and configured to focus incoming light onto the imaging detector, the plurality of lenses each comprised of a material that is transparent to the light in the wavelength range of at least 1.0 μm to 5.0 μm, wherein a pupil of the optical imaging system is located external to the plurality of lenses between the plurality of lenses and the imaging detector.
摘要:
A reflective optical form that has both a telecentric image and a real entrance pupil. In one example, a non-relayed optical imaging system includes a real entrance pupil configured to admit a beam of electromagnetic radiation, an image plane, and a reflective triplet including a negative primary mirror, a positive secondary mirror optically coupled to the primary mirror, a negative tertiary mirror optically coupled to the secondary mirror, the reflective triplet configured to receive the beam of electromagnetic radiation from the real entrance pupil and to focus the beam of electromagnetic radiation onto the image plane to form a telecentric image at the image plane.
摘要:
A steerable-light-path optical device includes a light transceiver having an external light path associated therewith, and a path-steering device that controls the direction of the light path relative to a steering axis. The path-steering device has a first beam-deviation optical element including a first prism structure having a first diffraction grating thereon, and a second beam-deviation optical element including a second prism structure having a second diffraction grating thereon. The steering axis passes through the first and second beam-deviation optical elements. A rotational drive is operable to rotate at least one of the first beam-deviation optical element and the second beam-deviation optical element, and preferably both of the beam-deviation optical elements, about the steering axis.
摘要:
Provided is a calibration source IR assembly for an IR detector including an IR focal plane. The calibration assembly includes a rotatable spectral filter wheel optically coupled to an IR focal plane of the detector, the filter wheel having a plurality of areas each of at least a minimum size. At least one area being a calibration area, the calibration area including: a substrate having a first side facing the IR focal plane and a second side opposite from the first side; a light transmitting edge section disposed between the first side and the second side; and at least one light redirector disposed at least partially within the substrate, the light redirector structured and arranged to receive light from the edge and to redirect the light out the first side. A light source optically coupled to the edge section. An IR detector including the improvement of such a calibration source IR assembly is also provided.
摘要:
A beam-steering apparatus comprises a set of planar tiltable mirrors positioned to define a light beam path therebetween. The set of planar tiltable mirrors comprises from three to five planar tiltable mirrors. Each of the planar tiltable mirrors has a center of rotation lying in a plane of the mirror and each of the planar tiltable mirrors is tiltable about one axis of rotation or two orthogonal axes of rotation that lie in the plane of the mirror. The total number of axes of rotation about which the planar tiltable mirrors of the set of planar tiltable mirrors can tilt is at least five. A mirror drive system tilts each respective planar mirror about its respective axis of rotation or axes of rotation. With this apparatus, an input or output light beam path is steerable over two angular, one rotational, and two lateral-position degrees of freedom.
摘要:
An optical pulse-width modifier structure includes a first diffraction grating and an optically unpowered reversing mirror. An optical path extends between the first diffraction grating and the optically unpowered reversing mirror. A second diffraction grating lies on the optical path between the first diffraction grating and the optically unpowered mirror. A set of optically powered mirrors lies on the optical path between the first diffraction grating and the second diffraction grating. The diffraction gratings and mirrors are positioned such that an input light beam is diffracted from the first diffraction grating, reflected from each of the set of optically powered mirrors, diffracted from the second diffraction grating, reflected from the optically unpowered reversing mirror back to the second diffraction grating, diffracted from the second diffraction grating, reflected from each of the set of optically powered mirrors, and diffracted from the first diffraction grating as an output light beam. The present approach produces a differential path length as a function of wavelength.
摘要:
An all-reflective optical system includes an all-reflective afocal module, an all-reflective imaging module and an all-reflective switching structure being operated to direct a light beam through the afocal module and the imaging module. A first position of the switching structure directs the light beam to enter the first optical end of the afocal module and exit the second optical end of the afocal module, and thereafter to enter the input optical end of the imaging module. A second position of the switching structure directs the light beam to enter the second optical end of the afocal module and exit the first optical end of the afocal module, and thereafter to enter the input optical end of the imaging module. A third position of the switching structure directs the light beam to enter the input optical end of the imaging module so that the light beam completely bypasses the afocal module.
摘要:
A wide field of view imaging system (100). The novel system (100) includes a rotating mirror (18) having two reflective surfaces each surface, respectively, reflecting light from a scene to first and second sensors (10, 12) positioned to receive light from the mirror (18), wherein the first and second sensors (10, 12) each occupy a different portion of the volume surrounding the mirror (18). In the illustrative embodiment, the mirror (18) is a flat, double-sided mirror rotating at a constant velocity about an axis parallel with the surface of the mirror (18). The first and second sensors (10, 12) are all-reflective optical systems, with the first sensor (10) opposite the second sensor (12). In the preferred embodiment, the invention further includes third and fourth opposing sensors (14, 16) clocked 90° from the first and second sensors (10, 12). The first and second sensors (10, 12) cover an outer annulus of the field of view while the mirror (18) rotates a first 90°, and the third and fourth sensors (14, 16) cover an inner annulus while the mirror (18) rotates the next 90°.