151 results about "Aperture plane" patented technology

This invention uses a real-time holographic medium to record the amplitude and phase information collected from a moving platform at the aperture plane of a side-looking optical sensor over the collection time. A back-scan mirror is used to compensate platform motion during the synthetic aperture integration time. Phase errors caused by a nonlinear platform motion are compensated by controlling the phase offset between the illumination beam and the reference beam used to write the hologram based on inertial measurements of the flight path and the sensor line-of-sight pointing angles. In the illustrative embodiment, a synthetic aperture ladar (SAL) imaging system is mounted on a mobile platform. The system is adapted to receive a beam of electromagnetic energy; record the intensity and phase pattern carried by the beam; and store the pattern to compensate for motion of the platform relative to an external reference. In the illustrative embodiment, the image is stored as a holographic image. The system includes a back-scan mirror, which compensates the stored holographic pattern for motion of the platform. The medium and back-scan mirror may be replaced with a digital camera and one-dimensional and two-dimensional arrays may be used. In a specific embodiment, a two-dimensional array is used with a time delay and integration (TDI) scheme, which compensates for motion of the platform in the storage of the optical signals. In an alternative embodiment, a back-scanning mirror is used to compensate for motion of the platform. Consequently, the interference pattern between a relayed image of the aperture plane and a reference beam is continuously stored. In this embodiment, the instantaneous location of the received beam on the recording medium is controlled to compensate for motion of the platform.

A camera includes a lens and a sensor. A dynamic mask is arranged at an aperture plane between the lens and the sensor, and a static mask is arranged immediately adjacent to the sensor. Angular, temporal or spatial variations in light rays acquired of a scene by the sensor are mapped to individual pixels of the sensor.

An adjustable multimode lightfield imaging system. A non-homogeneous filter module is positioned at the aperture plane of the lightfield imaging system and provides the multimode capability. The filter module can be moved relative to the imaging system, thus allowing adjustment of the multimode capability.

New methods for phase contrast imaging in transmission electron microscopy use the imaging electron beam itself to prepare a hole-free thin film for use as an effective phase plate, in some cases eliminating the need for ex-situ fabrication of a hole and reducing requirements for the precision of the ZPP hardware. The electron optical properties of the ZPP hardware are modified primarily in two ways: by boring a hole using the electron beam; and/or by modifying the electro-optical properties by charging induced by the primary beam. Furthermore a method where the sample is focused by a lens downstream from the ZPP hardware is disclosed. A method for transferring a back focal plane of the objective lens to a selected area aperture plane and any plane conjugated with the back focal plane of the objective lens is also provided.

The present invention discloses a camera array-based light field microscopic imaging system and method. The system includes a microscope which enlarges a microscopic sample to an image plane through a cameral lead-out opening, an enlargement module which can generate an aperture plane, an imaging lens array which obtains sample images of the microscopic sample under different angles of view, a sensor array wherein each sensor correspondingly records a sample image obtained by an imaging lens corresponding to the sensor, and a controller which acquires and calibrates the sample images synchronously so as to obtain the light field and/or light field video of the microscopic sample. According to the camera array-based light field microscopic imaging system and method provided by the embodiment of the invention, the sample images of the microscopic sample under different angles of view are obtained and calibrated, so that the light field and/or light field video of the microscopic scene can be obtained, and therefore, high-performance microscopic imaging and application can be realized, and spatial resolution can be improved, and use experience of users can be also improved.

Impedance matching is achieved in a waveguide of a slot antenna, which is provided with an input waveguide that is fed power via an aperture plane; a stairway structure is provided in the input waveguide; the structure creates a step going upward toward a surface provided with a slot; the step difference and height of the step going upward are adjusted so that the impedance at a plane above the step and the impedance at the aperture plane match.

In an intake air mass flow measurement device, for preventing clogging in a pressure intake tube due to water or the like entering the pressure intake tube in a device measuring a pressure in the intake air tube, the intake air mass flow measurement device includes a mass air flow measurement device for measuring an intake air mass flow in an intake air tube; and a pressure sensing device for sensing pressure in the intake air tube, the pressure sensing device being integrated with the mass air flow measurement device, and an aperture plane opened to the inside of a main air flow passage for detection of the pressure takes in pressure by using a gap generated between a main air flow passage constituting member and an insertion part of the mass air flow measurement device when a measurement part of the mass air flow measurement device is inserted into the main air flow passage. With this construction, it is possible to provide a structure in which water or the like can hardly clog the pressure intake port.

The invention provides a large-aperture optical system MTF measuring device and method in order to solve the technical problems that in a traditional large-aperture optical system MTF detecting mode,the testing precision is easily affected by the surface shape of an optical element in a large-aperture collimator, the disturbance resisting capacity is poor, and the testing cost is high. Accordingto the invention, a small-aperture plane mirror is used as a reference plane mirror, an active Hartmann wavefront sensor is used as wavefront measurement equipment, the small-aperture plane mirror ismoved to each sub-aperture position of a large-aperture optical system, and the active Hartmann wavefront sensor is used to acquire the wave aberration of each sub-aperture. When the full aperture iscompletely covered, sub-aperture wave aberration data are spliced by adopting a sub-aperture splicing algorithm to obtain full aperture wave aberration, and the full aperture wave aberration can be converted into an MTF value of an optical system after numerical calculation. According to the invention, the use of an interferometer and a large-aperture plane mirror is avoided, the anti-disturbancecapability of the whole system is improved, and the test cost is reduced.

A flexible multi-leaf collimator for electron radiotherapy is provided, where the leaves are not a single rigid component, but are configured in a manner that curves away from the patient to provide greater clearance. The invention includes a plurality of flexible assemblies, at least one guide supporting the assemblies, and a plurality of assembly drivers. The driver engages the assembly and moves the assembly along the guide. The assembly has an extended state and a retracted state relative to the guide, such that when in the extended state the assembly is held in the aperture plane and when in the retracted state the assembly conforms along the guide. When in the extended state the assemblies are disposed as a treatment aperture.

The present invention relates to a method (300) for reducing stray light in an output image of a scene, said method comprising; providing (301) a camera (100) comprising a lens assembly (102, 202), providing (302) an aperture unit (103, 203) having an aperture gate (204a, 204b) in an aperture plane being orthogonal to an optical axis (OA) of said lens assembly (102, 202), said aperture gate (204a, 204b) being adjustable in said aperture plane, acquiring (303), by means of said camera (100), a plurality of images of said scene, wherein each image of said plurality of images is acquired using an unique aperture gate setting, wherein each of said unique aperture gate settings correspond to a unique combination of a position and a shape of said aperture gate (204a, 204b) in said aperture plane, analyzing (305) said plurality of images for generating data pertaining to a difference in stray light content with respect to said plurality of images, and producing (306) said output image based on said data pertaining to said difference in stray light content.

An incident illumination device for a microscope for providing oblique or straight incident illumination is described. The illumination device comprises a light source that includes at least two 2-dimensional, surface light-emitting segments and is imaged into an aperture plane of the incident illumination device. At least one of the at least two light-emitting segments of the light source is designed to be activated individually. Further, a microscope comprising this incident illumination device is described, and methods of using this microscope both for oblique and straight illumination are described. In addition to conventional incident bright-field illumination, the described microscope and methods of use thereof allow also to select between angular or oblique incident illumination.

The present invention provides a collection end frequency domain pasting microscopic system based on a spatial light modulator. The system comprises: a microscope configured to amplify a microscopic sample into an image plane; a relay module configured to reduce the aperture plane of imaging of the sample; a frequency spectrum modulation module consisting of a polarization splitting prism and a spatial light modulator; a camera imaging module consisting of an imaging lens and a camera sensor and configured to receive optical signals through frequency spectrum modulation through the spatial light modulator and then through the emission through the slope of the polarization splitting prism and collect the corresponding sample image; a controller configured to perform synchronous control of frequency spectrum modulation and image collection and rapidly collect a plurality of low-resolution images in different spatial frequency spectrums to obtain an original image data required by the single-frame high-resolution images or the multi-frame high-resolution video. On the premise of ensuring the field of view with a certain width, the spatial resolution collected by the camera sensor is improved, the high-resolution reconstruction with a certain thickness sample is realized, the collection of the dynamic samples is realized to some extent, and the collection end frequency domain pasting microscopic system based on the spatial light modulator is simple and easy to realize.

The invention discloses a nanometer scale uniform optical tunnel generating method and device. The method comprises the steps that a laser beam is enlarged, collimated and converted into a linearly polarized laser beam; a reflection-type pure phase spatial light modulator is used to carry out quadratic special fan-shaped partition phase modulation on the collimated and enlarged linearly polarized laser beam to acquire a phase-modulated linearly polarized vortex beam; the phase-modulated linearly polarized vortex beam is converted into a phase-modulated radially polarized vortex beam by a radially polarized light converter; a 4F imaging system is used to image the phase-modulated radially polarized vortex beam to the rear aperture plane of a focusing objective lens; the objective lens focuses the phase-modulated radially polarized vortex beam to acquire a nanometer scale uniform optical tunnel in a focal area. The uniform optical tunnel is formed by optimizing and splicing four same optical tunnels produced by quadratic special fan-shaped partition phase modulation. The longitudinal intensity uniformity of the optical tunnel is within 10 wavelengths, and the intensity fluctuation error is less than three percent.