618 results about "Long wave infrared" patented technology

Several methods are disclosed for the generation of coherent short-wavelength electromagnetic radiation through optical nonlinear frequency mixing means. The invention involves several stages of efficient nonlinear frequency conversion to shift the output of high-power infra-red fiber-lasers into the vacuum ultraviolet (VUV). The described laser source architecture is designed around non-critically phase-matched (NCPM) sum-frequency mixing (SFM) interactions in the nonlinear crystal CLBO. The NCPM interaction is an optimum condition for bulk frequency conversion of cw radiation because it allows tight focusing of the input laser radiation without Poynting vector walk-off, thereby increasing the non-linear drive significantly. The sub-200-nm output wave is generated from SFM of a long-wave IR laser field and a short-wave UV laser field. The long-wave laser beam may be derived directly from a rare-earth-doped fiber laser, whereas the short-wavelength UV beam is provided as the fourth frequency harmonic of a second rare-earth-doped fiber laser system.

The presently described embodiments comprise a system that includes a color changing medium, an erasing device using heat or long wavelength infrared light as the erasing source, a writing device that can imagewise apply a UV light to write the image on the media, and a transport to transport the media along a paper path to be seen by the erasing device and the writing device. The system could also function in an alternative way. The image could be “erased” to the all dark state using light (e.g. ultraviolet light) and then heated or illuminated using, for example, infrared light in imagewise fashion to produce the image.

The invention relates to a laser and middle- and long-wavelength infrared common-aperture three-band imaging system, which comprises an entrance pupil shared by each band, a primary mirror, a secondary convex mirror, a middle/long-wavelength infrared optical path imaging lens group, a laser converging light spot receiving unit, a middle- and long-wavelength infrared band beam splitter, a middle- and long-wavelength infrared dual-band imaging lens group and a detection image surface, wherein the reflection surface of the primary mirror is a concave surface, and a hole is formed in the center of the primary mirror. The system can be used for realizing the common-aperture collection of scene infrared radiation energy of the same object and laser echo energy reflected by the object; and the entrance pupil is positioned in front of the primary mirror, the secondary mirror is used for the beam splitting of laser and middle- and long-wavelength infrared bands, and a dichroic mirror is inclined to split middle-wavelength infrared light and long-wavelength infrared light, so that the system is compact in structure, the utilization rates of optical energy and space of the system are increased, the aberration correction and beam focusing of middle- and long-wavelength infrared bands are facilitated respectively, and the imaging quality is remarkably improved.

The invention discloses a device and a method for cooperatively detecting a moving target by using all-optical-waveband (including ultraviolet, visible, near-infrared, medium-wave infrared and long-wave infrared) maps. The device comprises a large field-of-view two-dimensional scanning sighting telescope, a common aperture primary optical system module, an infrared imaging and spectrum forming optical subsystem module, an ultraviolet/visible/near-infrared spectrum forming and visible near-infrared imaging optical subsystem module, a short/medium/long-wave infrared spectrum measuring module, a medium-wave wide/narrow band imaging module, a visible near-infrared spectrum measuring module, a visible near-infrared imaging module, an ultraviolet measuring module, a map fusion signal processing module, a control module and a servo system. The device and the method utilizes medium-wave infrared imaging and visible near-infrared imaging for recognizing a suspected moving target and guides spectrum measurement, completes the final recognition of the suspected target with cooperation of spectrum measurement data, and solves the difficulties of the existing detection device such as incomplete detection bands, limited optical path layout, large equipment size, few types of detected moving targets and dynamic changing objects, and poor detection capability.

The invention discloses a short wave/medium wave/long wave infrared detector based on InAs/GaSb class II-type superlattice materials. The detector comprises a GaSb substrate, an epitaxial structure deposited on the GaSb substrate, a passivation layer and a metal electrode, wherein the epitaxial structure sequentially comprises a GaSb buffering layer, an n-type InAs/GaSb superlattice contact layer, a first M-type InAs/GaSb/AlSb/GaSb/InAs superlattice hole blocking layer, a p-type InAs/GaSb superlattice long wave infrared absorbing layer, a first p-type InAs/GaSb superlattice contact layer, a p-type InAs/GaSb superlattice medium wave infrared absorbing layer, a second M-type InAs/GaSb/AlSb/GaSb/InAs superlattice hole blocking layer, a p-type InAs/GaSb superlattice short wave infrared absorbing layer, a second p-type InAs/GaSb superlattice contact layer and a cover layer. The detector is of a pMp-p-pi-M-n heterostructure and has the advantages of being low in crosstalk, low in dark current and high in detection rate.

The invention discloses an optical system of a multispectral area array CCD (Charge Coupled Device) imager, relating to the field of design and manufacture of the optical system of the multispectral area array CCD imager and solving the problems that the traditional multispectral imager can only obtain spectrum information of a certain wave band of a target at the same time and can not realize the design requirements of a multispectral optical system with wide wave band range and temperature range and a long back working distance. The system consists of two sets of subsystems, a first set of subsystem realizes spectrum information of untraviolet, blue, green, red and infrared wave bands, and the system obtains information of different wave bands through two lens sets and a corresponding detector and carries out imaging; and a second set of subsystem image the obtained information by adopting two germanium lenses and a long wave infrared detector to realize spectrum information of a long wave infrared wave band. The invention realizes simultaneously imaging of a target at six wave bands by adopting two sets of optical systems and is suitable for multispectral imaging places with strict requirements on the volume and the weight, such as aviation shooting.

A compact objective lens is disclosed which is particularly suitable for infrared optical systems. The lens features a simple design with only two lens elements, namely a first lens element receiving incident radiation and having front and rear surfaces, and a second lens element receiving incident radiation from the first element and having front and rear surfaces. The lens forms an image of a scene on a focal plane. At least three of the four surfaces of the elements are aspheric surfaces. The lens has an f-number less than about 2, a field-of-view less than about 30 degrees, and an effective focal length less than about 6 inches. The elements are made from a material selected to pass radiation in the infrared band of the electromagnetic spectrum, e.g., germanium. The lens is suitable for use as an objective lens for a long-wave infrared sight for small arms, e.g., rifle or shoulder-launched surface to air missile launching system, i.e., a lens optimized for operating in the electromagnetic spectrum between about 7.5 and about 15 micrometers.

The invention discloses a visible light/long-wave infrared broad band spectrum joint focusing optical imaging system comprises a broad spectrum focusing window, a color separation film, a long wave infrared lens group and a visible light lens group. The color separation film and a horizontal optical axis form an angle of 45 degrees, and light incoming from the broad spectrum focusing window passes through the color separation film and the visible light lens group to image on a visible light sensor. The long wave infrared lens group is composed of a first lens, a second lens, a reflector and athird lens from an object space to an image space in sequence, the reflector is parallel to the color separation film, and infrared light in broad spectrum light passes through the color separation film and the long wave infrared lens group to image on a non-refrigeration detector. A first face of the second lens is a binary surface, a second face of the third lens is an aspheric surface, and systematic heat difference and optical aberration are removed through the design of the binary surface and the aspheric surface. The visible light/long-wave infrared broad band spectrum joint focusing optical imaging system can solve the problem that a single wave band is not high in detection accuracy, two wavebands and two lenses have optical parallax on imaging, two wavebands are big in imaging aberration, an infrared system has heat difference, and two wavebands need focusing mutually.

The invention discloses a mutually-visual-field common-aperture multi-spectral imaging system with a Cassegrain front end. The system comprises a main lens, a refracting-reflecting dual-purpose secondary lens, a medium wave or long wave infrared or medium-long wave infrared dual-waveband imaging lens group, a medium wave or long wave infrared or medium-long infrared double-color detector unit, a visible to near infrared band imaging lens group, a visible to near infrared band color analyzer and a detection unit, wherein the main lens is provided with a central opening; the reflecting surface of the main lens is a concave surface; and the incident surface of the refracting-reflecting dual-purpose secondary lens is a convex surface. In the system, the main lens is taken as a public entrance pupil of each waveband and primary light splitting is realized by using the secondary lens, so that the luminous energy utilization ratio is increased, the spaces of a spectroscope and the system are saved, the realization of a long aperture and a large visual field is facilitated, and the imaging quality is improved remarkably. Due to the adoption of co-optical-axis mutually-visual-field imaging, images are easy to register.

The invention discloses a single lens multispectral imaging optical system and belongs to the technical field of remote sensing. The system specifically comprises a multispectral apochromatic lens, a first beam splitter, a second beam splitter, a doublet lens, a visible light flat-panel detector, an infrared flat-panel detector and a laser flat-panel detector. The first beam splitter reflects visible light, and transmits infrared and laser; the second beam splitter reflects laser and transmits infrared; and the multispectral apochromatic lens, the first beam splitter and the second beam splitter are made of materials of high transmittance from the visible light to a long-wave infrared band, preferably chemical vapor deposition zinc sulfide. The function of performing multispectral imaging by using a single lens is realized, an image from the visible light to the long-wave infrared band can be obtained, and imaging performance is high; the spectrum coverage range is wide; and the system can be widely applied to the remote sensing of the fields of aerophotography, agriculture and forestry, geology and geography, hydrology and marine, and the like.

The embodiment of the invention discloses a control method and system for the forest fire exploration through an unmanned plane. The method comprises the steps: obtaining a fusion image and the brightness temperature values of all pixels in the fusion image through the preprocessing, splicing and fusion and brightness temperature inversion of a visible image, a short-wave infrared image, a mid-wave infrared image and a long-wave infrared image; recognizing the position of an open fire point and the position of a blind fire point according to the fusion image and the brightness temperature values of all pixels in the fusion image; finally analyzing the influence scope of forest fire and the distance between the center of the forest fire and a power transmission line according to the positions of the fire points, determining the level of forest fire, and carrying out the early warning according to the level of forest fire. Compared with the prior art, the method can effectively distinguish the open fire point and the blind fire point, can carry out the early warning timely according to the level of forest fire, can effectively improve the detection rate of the forest fire and the put-out success rate of the forest fire, reduces the safety risk of fire fighters, and guarantees the safe and reliable operation of power transmission lines.

The invention relates to a detection method of sea fog remotely sensed by stationary meteorological satellites in the daytime and at night. The detection method comprises the following steps: firstly receiving and processing a data file S-VISSR by utilizing the number of the stationary meteorological satellites and obtaining a GPF document containing 5 channel data after being projected through calibration and location, data amendment, latitude and longitude projection and other pretreatments; then extracting sea fog information by utilizing 4 channel data in the GPF document, 2 split window channels in a long wave infrared window region, 1 intermediate infrared channel of 3.7 Mu m and 1 visible light channel of 0.67 Mu m according to the kinematic characteristics and the spectral characteristics of the sea fog; and firstly filtering a movable cloud boundary and a medium-high cloud boundary and then filtering water body in clear sky and partial low clouds by adopting the tertiary judging method, and finally determining a sea fog region by utilizing the region growing method. The invention not only achieves the real-time monitoring of the sea fog in a wide ocean plane and the dynamic track of the sea fog region, but also provides an important basis for the shot forecast of the sea fog, thereby obtaining sea fog real-time monitoring images per hour at least.

The invention belongs to the field of infrared image processing, and relates to an image enhancement method based on long-wave infrared polarization feature extraction and fusion method. The method comprises the steps of (S1) collecting an infrared polarization image, and preprocessing the collected infrared polarization image; (S2) performing Stokes polarization state calculation on the preprocessed image in the step (S1), and calculating a polarization degree and a polarization angle according to a Stokes polarization state calculation result; (S3) carrying out completely polarized light decomposition calculation by using the polarization degree and the polarization angle; (S4) defining a polarization orthogonal difference value, setting a weighting coefficient, and extracting a polarization feature image, wherein the polarization feature image comprises a polarization parallel component image and a polarization vertical component image; and (S5) fusing the polarization feature imageand an infrared intensity image by using a non-downsampling shear wave algorithm. The method can effectively extract the polarization information of a target scene, has a good polarization feature extraction effect, performs fusion on the extracted polarization feature image and the infrared intensity image and significantly enhances the information content of the target scene.

The invention discloses a bicolor dual-view field infrared imaging optical system. The bicolor dual-view field infrared imaging optical system is characterized by consisting of five lenses including a front fixing lens set (9), a multifocal lens set (10) and a rear fixing lens set (11), wherein the front fixing lens set consists of two lenses, the multifocal lens set consists of one lens, and therear fixing lens set consists of two lenses. The multifocal lens set can axially move in front of or behind a primary image surface to realize switching between a wide view field and a narrow view field; in the five lenses, lenses with a binary diffraction surface is used as a second surface of a second lens and a second surface of a fourth lens. The bicolor dual-view field infrared imaging optical system has the advantages of simple and compact structure, small system size and less lenses, can simultaneously performing imaging at a medium wave infrared wave band with wavelength of 4-5 microns and a long wave infrared wave band with wavelength of 8-9 microns while implementing functions of searching (a wide view field of 9 degrees* 6.75 degrees) and aiming (a narrow view field of 3 degrees*2.25 degrees). The system design takes account of miniaturization and lightweight requirement of the infrared system and meets the use technology requirement of the infrared system.

A system capable of low power personnel detection is based on a focused linear array of passive infrared detectors sampled and processed over time. For example, an exemplary system can have a sensor that captures infrared line images for personnel detection by scanning through a sensing plane of a linear array's field of view. In such a system, a processor controls the array sensor and stores the resulting images. Velocity characteristics of moving objects are incorporated into the images over time resulting in horizontal velocity profile images. Long wave infrared (LWIR) radiation can be sensed, which works in day and night conditions without illumination. LWIR sensors, such as microbolometers, as well as pyroelectrics, can be used.

The invention discloses an integrated infrared dual-band 20X zoom optical system. The integrated infrared dual-band 20X zoom optical system is composed of a common front fixing set, a common zooming set, a common compensation set, a common rear fixing set, a beam splitter prism, a long-wave infrared light rear fixing set, a medium-wave infrared focal length compensation set and a medium-wave infrared light rear fixing set which are sequentially arranged from left to right along an optical axis, wherein the beam splitter prism is used for reflecting medium-wave infrared light and transmitting long-wave infrared light, the long-wave infrared light rear fixing set is arranged on a transmission optical path of the beam splitter prism, the medium-wave infrared focal length compensation set is arranged on a reflection optical path of the beam splitter prism. In the continuous zooming process, a difference value between corresponding focal lengths of dual bands is less than a difference value between corresponding focal depths of the dual bands, target information of the dual bands can be received by the same system without switching the optical paths, and problems existing in an existing dual-band system at present are solved.

The invention relates to an uncooled long-wave infrared optical mechanical athermalizing lens. The optical system of the lens is provided with a front lens group A with negative focal power and a back lens group B with positive focal power which are arranged in turn along an incident direction of light rays from the left to the right. A diaphragm is arranged between the front group A and the back group B. The front group A comprises a crescent lens A-1 and a negative crescent lens A-2 which are arranged from the left to the right in turn. The back group B comprises a biconvex lens B-1. Optical compensation is realized via an optical mechanical hybrid athermalizing technology. A telescoping mechanism group performs telescoping via the principle of thermal expansion and cold contraction. The front group moves, positions of the back group and a sleeve are relatively fixed, and displacement amount generated by the front group is compensated by a compensation elastic sheet after the front group moves. System distortion is relatively low, lens concentricity, precision and axial position are accurate, and the structure of the lens is enabled to be compact and beautiful to the greatest extent.