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1341 results about "Large aperture" patented technology

A small aperture means a high f number, like f/22 or f/32. Where one draws the line is open to interpretation, and to context. A small aperture is also called slow (because it lets in less light, requiring a longer shutter speed to compensate).

Device for detecting surface shape of optical aspheric surface by sub-aperture stitching interferometer

The invention relates to a device for detecting a surface shape of an optical aspheric surface by a sub-aperture stitching interferometer, which comprises an interferometer, a transmission sphere, an adjusting mechanism, a numerical control device and a computer, wherein parallel light emitted by the interferometer is changed into a standard spherical wave through the transmission sphere; the computer controls the action of the adjusting mechanism by the numerical control device to adjust the relative position of the interferometer and an aspheric surface to be detected so that the standard spherical wave is incided to each sub-aperture of the detected optical aspheric surface sequentially and returns to the interferometer; and the computer extracts phase distribution data of each sub-aperture measured by the interferometer for analysis and processing, and the error distribution of the surface shape of a full aperture of the detected optical aspheric surface is obtained by a stitching algorithm. The device broadens horizontal and vertical dynamic range tested by the interferometer, can detect surface shapes of large-aperture concave and convex aspheric surfaces and an off-axis aspheric surface in high resolution and high precision without other auxiliary optical elements, and has low testing cost and short construction period.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Daytime stellar imager

InactiveUS20070038374A1Small and light systemAvoid star image blurCosmonautic vehiclesDigital data processing detailsDisplay deviceLongitude
An automatic celestial navigation system for navigating both night and day by observation of K-band or H-band infrared light from multiple stars. In a first set of preferred embodiments three relatively large aperture telescopes are rigidly mounted on a movable platform such as a ship or airplane with each telescope being directed at a substantially different portion of sky. Embodiments in this first set tend to be relatively large and heavy, such as about one cubic meter and about 60 pounds. In a second set of preferred embodiments one or more smaller aperture telescopes are pivotably mounted on a movable platform such as a ship, airplane or missile so that the telescope or telescopes can be pivoted to point toward specific regions of the sky. Embodiments of this second set are mechanically more complicated than those of the first set, but are much smaller and lighter and are especially useful for guidance of aircraft and missiles. Telescope optics focus (on to a pixel array of a sensor) H-band or K-band light from one or more stars in the field of view of each telescope. Each system also includes an inclinometer, an accurate timing device and a computer processor having access to catalogued infrared star charts. The processor for each system is programmed with special algorithms to use image data from the infrared sensors, inclination information from the inclinometer, time information from the timing device and the catalogued star charts information to determine positions of the platform. Direction information from two stars is needed for locating the platform with respect to the celestial sphere. The computer is also preferably programmed to use this celestial position information to calculate latitude and longitude which may be displayed on a display device such as a monitor or used by a guidance control system. These embodiments are jam proof and insensitive to radio frequency interference. These systems provide efficient alternatives to GPS when GPS is unavailable and can be used for periodic augmentation of inertial navigation systems.
Owner:TREX ENTERPRISES CORP

Daytime stellar imager for attitude determination

InactiveUS20060085130A1Small and light systemAvoid star image blurInstruments for road network navigationPosition fixationJet aeroplaneGuidance control
An automatic celestial navigation system for navigating both night and day by observation of K-band or H-band infrared light from multiple stars. In a first set of preferred embodiments three relatively large aperture telescopes are rigidly mounted on a movable platform such as a ship or airplane with each telescope being directed at a substantially different portion of sky. Embodiments in this first set tend to be relatively large and heavy, such as about one cubic meter and about 60 pounds. In a second set of preferred embodiments one or more smaller aperture telescopes are pivotably mounted on a movable platform such as a ship, airplane or missile so that the telescope or telescopes can be pivoted to point toward specific regions of the sky. Embodiments of this second set are mechanically more complicated than those of the first set, but are much smaller and lighter and are especially useful for guidance of aircraft and missiles. Telescope optics focus (on to a pixel array of a sensor) H-band or K-band light from one or more stars in the field of view of each telescope. Each system also includes a GPS sensor and a computer processor having access to catalogued infrared star charts. The processor for each system is programmed with special algorithms to use image data from the infrared sensors, position and timing information from the GPS sensor, and the catalogued star charts information to determine orientation (attitude) of the platform. Direction information from two stars is needed for locating the platform with respect to the celestial sphere. The computer is also preferably programmed to calculate further information which may be used by a guidance control system. These systems provide efficient alternatives to inertial navigation systems when such systems are too expensive and can be used for periodic augmentation and calibration of inertial navigation systems.
Owner:TREX ENTERPRISES CORP

Tongue hygiene device

A tongue hygiene device to be used with a mildly abrasive cleanser, the tongue hygiene device having a generally elongate handle section and a generally disk-shaped cleansing section. The handle section is ergonomically designed to allow the user to effectively and comfortably hold the tongue hygiene device in proper cleansing alignment with the tongue. The cleansing section includes three generally parallel, circular patterns of medium-length bristles of medium stiffness, protruding from a generally disk-shaped cleansing head, the cleansing head having a top face, and a bottom face from which the bristles protrude, and a large aperture extending between the centers of the bottom and top faces which is surrounded by the bristles on the bottom face. The bristles allow the tongue hygiene device to cleanse the tongue by brushing bacteria and food buildup from the tongue using a mildly abrasive cleanser. The aperture allows air and the lather formed by brushing with a cleanser to pass through the head element, thereby increasing the lather and facilitating the passage of bacteria and food buildup away from the surface of the tongue, and provides a conduit for the passage of air and water through the head element during cleaning of the tongue hygiene device, expediting and simplifying cleaning of the tongue hygiene device and hastening drying of the bristles.
Owner:PEAK ENTERPRISES

Sectional type porous ceramic dielectric gas fuel combusting device

The invention relates to a multi-stage multi-aperture ceramic dielectric gas fuel inflamer which includes an inflamer shell, a dust-removing wire netting or a metal brush, an air pipeline, a premixing chamber and a fuel gas pipeline. The invention is mainly characterized in that the inflamer shell is divided into an upper part and a lower part with a multi-aperture plate as a boundary. The inner part of the empty cavity at the upper part of the inflamer shell is sequentially provided with a ceramic multi-aperture dielectric of the large-aperture area which is arranged above a ceramic multi-aperture dielectric of the small-aperture area and the ceramic multi-aperture dielectric of the small-aperture area is arranged on the multi-aperture plate. The dust-removing wire netting or the metal brush is arranged under the multi-aperture plate and in the inflamer shell. The multi-aperture plate is imbedded into the middle of the upper and lower parts of the inflamer shell. The surrounding of the multi-aperture plate extends to the outside of the inflamer shell. The invention has the advantage that the multi-stage multi-aperture ceramic dielectric gas fuel inflamer has a higher thermal value range, thereby both the gas of a low thermal value or bum gas fuel and the gas of a higher thermal value can be burnt. The multi-aperture plate added in the inflamer has played a good role of radiating and can effectively prevent backfire or explosion.
Owner:NORTHEASTERN UNIV

Moveable-feeding-mechanism-based ultrasonic flaw detection system for bent steel tubes

InactiveCN103063743ARealize ultrasonic automatic detectionAchieve circumferential defectAnalysing solids using sonic/ultrasonic/infrasonic wavesHydraulic cylinderEngineering
The invention discloses a moveable-feeding-mechanism-based ultrasonic flaw detection system for bent steel tubes. The system comprises a moveable ring-shaped feeding mechanism, a set of hydraulic support frame which constitutes a bent tube holding base and two sets of ultrasonic detecting mechanisms for the bent steel tubes. The moveable ring-shaped feeding mechanism comprises a ring-shaped guide rail, internal gears, a feeding pneumatic telescopic link, a drive worm, a drive worm wheel, a drive link, a first electric motor mounting plate, adjusting tracks, a feeding servo motor, two roller mounting plates and two hydraulic support cylinders. The hydraulic support frame comprises a hydraulic cylinder, a hydraulic piston rod and a V-shaped support frame which is arranged on the hydraulic piston rod. Each set of the ultrasonic detecting mechanisms for bent steel tubes comprises a detecting servo motor, an external box body of a slewing mechanism, a drive gear, a gear shaft, a detecting pneumatic telescopic link, a chained ultrasonic probe frame mounting frame and a chained ultrasonic probe frame. According to the system, ultrasonic automatic flaw detection for large-aperture bent steel tubes can be realized, the precision and the efficiency of nondestructive tests for bent steel tubes are effectively improved and the detection labor intensity of workers is alleviated.
Owner:ZHEJIANG UNIV

Confocal-reflection streak lidar apparatus with strip-shaped photocathode, for applications at a wide range of scales

The system images the volume of a turbid medium and detects the contents. The medium can be water or air, or living tissue, or almost any other material which is at least partially light-transmissive. The system includes a light source for producing a series of discrete fan-shaped pulse beams that are substantially uniform in intensity or have been peaked at the edges of the fan to illuminate sections of the medium, a streak tube with a large, thin-slit-shaped photocathode for collecting the maximum amount of light from weak returns, a field-limiting slit disposed in front of the cathode for removing multiply scattered light, a large-aperture optical element for collecting and focusing the reflected portions of the pulse beam on the field-limiting slit and the cathode, and an array of detectors. A volume display of the medium is generated by translating the transmitter and receiver normal to the longitudinal axis of the pulse beam, to illuminate adjacent sections of the medium, and combining the sections to provide a volume display. All, or substantially all, of the light returned from each pulse beam is used. Vehicle motion can be used to provide the scan of the beam. Applications range from foggy sky surveillance at multiple-kilometer scale to location of fractional-millimeter tumors in a human breast.
Owner:ARETA ASSOC

Light path collimation integrated device and method for high-power laser device

InactiveCN102354055AAchieving Simultaneous SamplingHigh resolutionOptical elementsGratingHigh power lasers
The invention discloses a light path collimation integrated device and method for a high-power laser device. A transmission grating engraved with references is put near to the small-hole face of a space filter; the transmission grating is irradiated by parallel non-coherent illumination lights produced by a light emitting diode and an illumination collimation lens at a specific angle; a sampling light path is put in a direction of first-stage diffraction light of the transmission grating so as to form a light beam information monitor; the light beam information monitor simultaneously acquiresinformation of a near field and a far field of a light beam; the output of the light beam information monitor is connected to a computer; deviation values of the near field and far field of the lightbeam relative to the respective set positions are determined through an image processing technology; and a corresponding near field adjusting device and a corresponding far field adjusting device areselected according to the respective deviation values so as to adjust light path collimation. The light path collimation integrated device has the characteristics of integration, modularization, simple structure and high precision, and can meet a monitoring requirement of the high-power laser device on large-aperture light beam collimation.
Owner:上海激光等离子体研究所

Method for comprehensively measuring reflectivity

The invention relates to a method for comprehensively measuring reflectivity, which comprises the following steps: dividing continuous incident laser beams into a reference beam and a detection beam, wherein the reference beam is focused on a photoelectric detector for direct detection and the detection beam is injected into an optical resonant cavity; using a cavity ring-down technology to measure an optical element with reflectivity more than 99%, respectively measuring a ring-down time tau 0 of an original optical resonant cavity output signal and a ring-down time tau 1 of the measured optical resonant cavity output signal after an optical element to be measured is added, and calculating the reflectivity R of the optical element to be measured; using the spectrophotometry to measure the reflectivity of the optical element to be measured when the R value is less than 99%; moving away an output cavity mirror; focusing detecting light reflected by a measuring mirror on the photoelectric detector for detecting while recording a light intensity signal ratio of the detection beam to the reference beam; and calibrating to further obtain the reflectivity R of the optical element to be measured. The device for measuring reflectivity can be used for measuring optical elements with any reflectivity and also can be used for realizing the high-resolution two-dimensional imaging of the reflectivity distribution of a large-aperture optical element.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI

Ultrasonic automatic scanning device for large-aperture pipeline in nuclear power plant

The invention relates to an ultrasonic automatic scanning device for a large-aperture pipeline in a nuclear power plant. The ultrasonic automatic scanning device comprises a mechanical scanning part, an electric control part and a pipeline part, wherein the mechanical scanning part comprises a circumferential guide rail part, a circumferential moving module and an axial moving module; the circumferential guide rail part comprises an annular body and a plurality of supporting legs which are mounted on the inner side of the annular body and are capable of moving along the radial direction of the annular body; the circumferential moving module comprises a circumferential guide rail fixed on the annular body, an arc-shaped fixed plate which is detachably mounted on the circumferential guide rail and is capable of moving along the circumferential guide rail, and a circumferential driving motor which is fixed at one end of the arc-shaped fixed plate and is meshed with the circumferential guide rail; the axial moving module comprises an arc-shaped frame detachably mounted on the arc-shaped fixed plate, a probe disk which is parallel to the arc-shaped fixed plate, can slide in the arc-shaped frame and is used for fixing ultrasonic probes, an axial driving motor fixed on the arc-shaped frame, and a transmission mechanism which is connected with the axial driving motor and is used for driving the probe disk. On one hand, the mechanical scanning part is modularized, so that the occupation space can be effectively reduced, and the mechanical scanning part can conveniently move and be mounted in the narrow space of the nuclear power plant; on the other hand, the mechanical scanning part is in a detachable quick connection locking mode, so that the mounting time is shortened.
Owner:CGNPC INSPECTION TECH +2

Three-dimensional large aperture tissue engineering scaffold based on nano-fibers and application thereof

The invention discloses a three-dimensional large aperture tissue engineering scaffold based on nano-fibers which is prepared in the following steps: a nano-fiber membrane which is made from electrostatic spinning is cut into fiber bundles with the diameter of 10mum-1mm. The fiber bundles are overlapped and the pore spacing between the fibers is 10mum-1mm. A three-dimensional structure is assembled and is bonded to be fixed. Thus, the three-dimensional large aperture tissue engineering scaffold which comprises the nano-fibers is obtained. The three-dimensional large aperture tissue engineering scaffold based on the nano-fibers has the beneficial effects that: (1) a nano-fiber secondary structure macroporous layer of the scaffold can promote the growth, the proliferation, the differentiation, and the like of target cells to form certain tissues, and a micron fiber primary structure macroporous layer of the scaffold can provide full tissue ingrowths space to defect internal cell tissues; (2) with good mechanical property, the scaffold can greatly reduce the requirement of polymeric biomaterials and degradation products; (3) the scaffold can be applied to bulk defect repairing and organizing engineering of tissues including bones, tendons, cartilages, skins, etc.
Owner:ZHEJIANG UNIV
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