20 results about "Aperture angle" patented technology

The present invention belongs to the field of optical testing technology, and in particular relates to a ghost image analysis method, device and storage medium for a space telescope bandpass camera. The ghost image analysis method for a space telescope bandpass camera comprises the following steps: obtaining a square aperture angle #imgabs0# of the space telescope bandpass camera; measuring the transmittance and reflectance of a filter, wherein the transmittance of the front surface of the filter is #imgabs1#, the transmittance of the rear surface of the filter is #imgabs2#, the reflectance of the front surface of the filter is #imgabs3#, and the reflectance of the rear surface of the filter is #imgabs4#; measuring the reflectance of a detector, wherein the reflectance of the surface of the detector is #imgabs5#; measuring the thickness #imgabs6# of the filter, and measuring the distance #imgabs7# between the filter and the detector; and performing ghost image analysis based on an illumination distribution function of the ghost image and energy, radius, coordinate calculation formulas and the like. The present invention achieves, for the first time, quantitative analysis of the specific position, shape and magnitude of the ghost image, and can be used for generating scientific simulation images.

An ultrasound endoscope and system are implemented. An ultrasound endoscope comprises: a transducer assembly in which a plurality of transducers extending in a first direction intersecting an axial direction of an insertion part are arranged in a curved shape; an observation window provided at a proximal end side of the insertion part with respect to the transducer assembly; an imaging module including an imaging optical system including the observation window and an imaging unit that performs imaging through the imaging optical system;and a support member that supports the imaging optics and the imaging unit, wherein an aperture angle of the transducer assembly when viewed in the first direction is 90 degrees or more and less than 180 degrees, an end edge of the transducer assembly in a direction perpendicular to an axis of the insertion part is included in an observation field of view of the observation window when viewed in the first direction, an angle of the observation field of view is equal to or smaller than the aperture angle, the support member includes a hole portion into which the imaging optics is inserted and a side surface surrounding the imaging unit, and a gap is formed between the side surface and the imaging unit.

The invention provides an optical system and a camera, the optical system is sequentially provided with an angle optical filter and an imaging surface from an object side to an imaging side along an optical axis, the angle optical filter is arranged on a diaphragm plane of the optical system, and light is projected to the imaging surface through the angle optical filter; in the angle optical filter, the transmittance corresponding to each diaphragm angle is restrained to be the ratio of the minimum relative illuminance on the imaging surface to the relative illuminance corresponding to the diaphragm angle, and the diaphragm angle is the included angle between light rays and the optical axis when the light rays penetrate through the angle optical filter. The angle filter is configured to have different transmittance characteristics for light rays of different incident angles. When incident light rays at different angles penetrate through the angle optical filter and are projected to the imaging surface, the light rays projected to the imaging surface can realize relative illumination balance through differentiated setting of the angle optical filter on the transmittance of the incident light rays at different angles, so that the quality of a formed image is effectively improved.

Disclosed in this disclosure is a method for super-resolution microscopic interferometric measurement based on broadband annular radially polarized light, where a broad-spectrum light source with an extended surface is selected; uniform illumination covering a to-be-tested FOV and having a certain aperture angle is provided using a Kohler illumination system; a two-stage relay system is designed, and amplitude and polarization of a full-FOV beam is modulated by a liquid crystal spatial light modulator and a vortex waveplate; broadband annular radially polarized light is focused based on the extended surface light source and a microscopic objective lens with a high numerical aperture to implement super-resolution microscopic interference imaging of a sample; and super-resolution topography measurement directed at a surface of a microstructure is implemented combined with phase-shifting interferometry.

The application provides a deep diffraction field velocity modeling method and device, electronic equipment and storage medium, relates to the deep resource exploration field, and the method comprises the following steps: obtaining diffraction wave separation data, constructing a common diffraction point multi-aperture angle gather through angle migration based on an edge diffraction model and a scatterer physical model, and capturing the diffraction response in the multi-aperture; according to the angle gather, a correction relationship between the diffraction point dip angle and the migration velocity is established; then, according to the correction relationship, for each common diffraction point multi-aperture angle gather, the diffraction field velocity spectrum of each diffraction point is calculated based on the local similarity and the mixed weight of the difference boot-strap; the diffraction wave velocity value of the focused signal is picked up through human-computer interaction; and finally, the model is constructed through interpolation. The application can effectively capture the weak energy of deep diffraction bodies, improve the focusing quality of the velocity spectrum, construct a refined velocity model, and provide support for imaging of deep dry hot rock and other unconventional reservoirs.

The application relates to a method and system for outputting a pre-stack migration aperture angle migration trace set, comprising the following steps: obtaining a migration velocity model and seismic data of a target area; simulating a source-end wave field and an orthogonal wave field thereof based on the migration velocity model, and reversely propagating to obtain re-constructed source-end wave field and orthogonal wave field thereof; placing the obtained seismic data at a detector end, and reversely propagating a wave field and an orthogonal wave field thereof at the detector end based on the migration velocity model; performing uplink and downlink wave separation on the wave field and the orthogonal wave field at the source end and the detector end; obtaining a slope-intention vector of a downlink wave field according to the downlink wave field and the orthogonal wave field at the source end, obtaining a slope-intention vector of an uplink wave field according to the uplink wave field and the orthogonal wave field at the detector end, and determining an aperture angle; imaging the downlink wave field at the source end and the uplink wave field at the detector end to obtain an imaging value, and extracting an aperture angle trace set of the target area, and the application can be widely applied in the field of geophysical exploration technology.

A rod lens array 10a includes a plurality of gradient-index rod lenses 1b arrayed to have optical axes parallel to each other, and forms an erecting equal-magnification image. The gradient-index rod lenses 1b each have a refractive-index distribution in a radial direction thereof. The refractive-index distribution n(r) is approximated by n(r)=n0·{1−(A / 2)·r2}, where a refractive index at a center of the gradient-index rod lens 1b is represented by n0, a refractive-index distribution constant of the gradient-index rod lens 1b is represented by √A, and a distance from the center of the gradient-index rod lens 1b is represented by r. The gradient-index rod lens 1b has an aperture angle θ of 3 to 6°, the aperture angle θ represented by θ=sin−1(n0√A·r0), where a radius of the gradient-index rod lens is represented by r0. The rod lens array 10a has an imaging distance of 45 to 75 mm and a depth of field of 1.5 to 3.0 mm with value of modulation transfer function (MTF) of 30% or more at a spatial frequency of 6 lp / mm.

A laser light source device (1) and a projection device belong to the field of laser display. The laser light source device (1) comprises: a laser array (11), a light transmission component (12) and a compound eye lens (13), wherein the compound eye lens (13) comprises a plurality of rectangular lenses (131) arranged in an array, wherein the fast axis direction (f1) of the laser (111) is parallel to the short side (b) of the rectangular lens (131) in the compound eye lens (13), and the slow axis direction (f2) of the laser (111) is parallel to the short side (b) of the rectangular lens (131) in the compound eye lens (13). 31), and the sine value (sinα1) of the divergence angle (α1) of the fast axis of the laser (111) is greater than the sine value (sinβ1) of the aperture angle (β1) of the long side (a) of the rectangular lens (131), and the sine value (sinα2) of the divergence angle (α2) of the slow axis of the laser (111) is greater than the sine value (sinβ2) of the aperture angle (β2) of the short side (b) of the rectangular lens (131).

Provided is a lens which has an aspherical surface and is capable of capturing an image in a wide range, and which is more stably provided. The lens includes a first part, which is made of a first material, and has a concave surface; and a second part, which is made of a second material, and is to be bonded to the concave surface side of the first part. The second part is formed into a ring shape, and the second part defines a half aperture angle of a ray effective diameter to an angle of 65 degrees or more and 90 degrees or less.

The embodiment of the invention discloses a transmitting module and a laser radar. The transmitting module comprises a transmitting unit, plate glass and a first lens, and the inclined directions of the plate glass and the first lens are opposite; a scanning light beam emitted by the emission unit sequentially transmits the first lens and the plate glass, the scanning light beam comprises a first sub-light beam and a second sub-light beam, the first sub-light beam corresponds to a first aperture angle of the emission module, the second sub-light beam corresponds to a second aperture angle of the emission module, and the first aperture angle and the second aperture angle are symmetrical about an optical axis of the emission module; the optical path of the first sub-beam transmitted from the light-emitting surface of the transmitting unit to the exit pupil plane of the transmitting module is equal to the optical path of the second sub-beam transmitted from the light-emitting surface of the transmitting unit to the exit pupil plane of the transmitting module. The first lens and the plate glass are arranged in different inclination directions, so that aberration generated when the non-parallel light beams transmit the plate glass is compensated, and the ranging precision of the laser radar is improved.

To calibrate a camera system with at least three cameras (51, 52, 53) with known focal lengths (f), arranged side by side in the region of a common camera arrangement plane (xy) along a camera arrangement coordinate (x) and whose object-side opening angle is each at most 45°, at least three calibration marks are first selected. The calibration marks serve to specify a calibration marker point (P) for each. A , P B , P C ), where the calibration marker points (P A , P B , P C ) at various intervals (d A , d B , d C ) are arranged relative to the camera arrangement plane (xy). The calibration marker points (P A , P B , P C ) are used with the cameras (51, 52, 53) to capture calibration marker pixels (P A ', P B ', P C') is mapped into a camera image plane of the respective camera (51, 52, 53). For each pairing of two of the cameras (51, 52, 53), a disparity of the mapping of the respective calibration marker pixel (P) is determined. A ', P B ', P C ') measured in the respective camera image plane. From the at least nine measured disparities and the camera focal lengths (f), distances (x) are calculated. i - x k ) between each of the cameras (5 i , 5 k ) of a camera pair along the camera arrangement coordinate (x) as well as positional errors of each camera pair (5 i , 5 k ) determined, which result from deviations in the arrangement of the cameras (51, 52, 53) relative to the camera arrangement plane (xy). This results in a calibration procedure that ensures precise and reliable operation of the camera system.

The application discloses a wide-angle mobile phone lens, which is developed from a flat optical plastic without a curvature radius through hammer type optimization and boundary parameter guidance limitation of a target mobile phone lens, and the wide-angle mobile phone lens has high image quality and is composed of a double-convex positive lens, a first double-concave negative lens, a first concave-convex positive lens, a second concave-convex positive lens, a third concave-convex positive lens, a second double-concave negative lens and a near-infrared filter which are sequentially arranged from front to back. Under the premise that a large number of asymmetric aberrations are generated in front of the diaphragm of the mobile phone lens, the application realizes 84-degree wide-angle imaging breakthrough design, and only through even aspheric surfaces, excellent image quality is realized, through reservation of trace aberrations of edge field points, increase of an edge beam aperture angle, improvement of edge beam relative luminance, and change of the fact that relative luminance is reduced with the increase of a field of view.

The invention relates to the field of water immersion objective lenses, and particularly discloses a large numerical aperture water immersion objective lens for a confocal imaging system, the objective lens is an infinite conjugate optical system, the objective lens sequentially comprises an object plane, a cover glass, a water layer and an optical lens group from an object space to an image space, the optical lens group is composed of ten spherical lenses, the front group is used for bearing main focal power and an aperture angle; the diaphragm is used for controlling the numerical aperture of the system; the rear group is mainly used for correcting aberration and field curvature; according to the invention, through the optical lens group composed of the object plane, the cover glass, the water layer and the ten spherical lenses, harmony and unification of an ultrahigh numerical aperture and a long working distance are successfully realized, the contradiction between high-resolution imaging and operation safety is effectively solved, and a more convenient and safer observation means is provided for researchers; the water immersion objective lens shows excellent aberration correction capability in a full wave band, the wave aberration PV value is close to the diffraction limit, and the axial aberration and the vertical axis aberration are both controlled at an extremely low level.

The purpose of the present invention is to provide a synthetic aperture pSAFT focusing imaging algorithm in a polar coordinate system and a synthetic aperture imaging technology for ultrasonic spiral scanning and detection of metal round bars based on the algorithm. The specific imaging technology is: firstly, after a spiral scanning of the metal round bar, a data set is obtained, and then the semi-aperture angle θ′ of the workpiece surface and the radius r of the inscribed circle that can be covered by the sound beam at all positions are calculated; for all points A (ρ, α) in the round bar, synthetic focusing calculations are performed according to the synthetic aperture focusing imaging formula in the polar coordinate system with appropriate imaging resolution, so as to obtain a data matrix Sp (i, j); finally, the polar coordinate data matrix is ​​coordinate-transformed to display a circular cross-section tomographic scan. The method can meet the online real-time detection requirements as much as possible while improving the detection resolution, and intuitively display the information such as the size and distribution of defects in the bar in the form of a tomographic scan similar to CT imaging, providing richer and more accurate information for the quality evaluation of the bar.

The invention provides a super-lens optical microscope objective lens structure and a preparation method thereof, the structure comprises a lens barrel, and a front lens and a plane mirror located at two ends of the lens barrel, and the front lens and the plane mirror enable the lens barrel to be a closed structure; wherein the front lens is a super lens, and a sub-wavelength unit structure is arranged on the side, close to the interior of the lens barrel, of the super lens. The super lens is used for replacing a traditional curved mirror and serves as the front lens of the objective lens of the optical microscope; the super lens is an optical device which is used for processing a sub-wavelength unit structure on a planar light-transmitting material to realize wavefront regulation and control. Moreover, by utilizing the characteristic that the focal length of the super lens is small enough, the working distance of the objective lens is reduced, the magnification factor of the objective lens is improved, the aperture angle of the objective lens reaches the limit of about 180 degrees, the numerical aperture of the objective lens can be effectively improved, the effect of improving the resolution is achieved, and the compact, high-efficiency and large-aperture super lens is realized.

The invention discloses a far-infrared wide-angle retroflex and teleflex hybrid lens and an optimization design method. The far-infrared wide-angle retroflex and teleflex hybrid lens comprises a front-group negative lens, a rear-group positive lens and an imaging surface which are sequentially arranged from an object plane to an image plane along an optical axis, the front group of negative lenses is provided with a spherical lens with negative focal power, and the spherical lens plays a role in diverging incident light beams so as to enlarge the field angle of the optical system; the rear group of positive lenses is provided with a first metasurface lens, a second metasurface lens and a diaphragm, the diaphragm is arranged between the first metasurface lens and the second metasurface lens, and the diaphragm is an aperture diaphragm and is used for limiting the width of a light beam entering the optical system, controlling the aperture angle of an imaging light beam and correcting aberration. The far-infrared wide-angle retroflex and teleflex hybrid lens provided by the invention has excellent imaging quality in a long-wave infrared band, can correct various aberrations at the same time, realizes more excellent imaging when a remote object is observed, and meets the requirements of light weight, compact structure and small volume.

The application provides a microscopic imaging system position calibration method based on LED array illumination. Without placing a sample, an image is collected to extract a vignetting circle arc, and a radius and a corresponding circle center coordinate are obtained through circle fitting. An image coordinate system is established. An LED array illumination coordinate system is established. A deflection angle theta of the LED array illumination coordinate system relative to the image coordinate system is calculated by fitting each LED illumination corresponding image center. An image center coordinate corresponding to the center LED illumination is calculated according to the center coordinates of each image under LED illumination. The vignetting circle circumference can be regarded as an aperture angle region, and the pixel height from the LED array plane to the object plane is calculated in combination with the fitted vignetting circle pixel radius. An equation is established for each LED illumination corresponding incident angle, and the actual height h from the LED array plane to the object plane and the XY position offset difx and dify of the center LED illumination unit relative to the optical axis can be calculated. The application realizes the correction of the illumination wave vector, eliminates the influence of the system position error, and improves the Fourier stack imaging effect.

The invention belongs to the technical field of optical testing, and particularly relates to a ghost image analysis method and device of a space telescope band-pass camera and a storage medium. The ghost image analysis method of the space telescope band-pass camera comprises the following steps: acquiring a square aperture angle # imgabs0 # of the space telescope band-pass camera; the transmittance and the reflectivity of the optical filter are measured, the transmittance of the front surface of the optical filter is # imgabs 1 #, the transmittance of the rear surface of the optical filter is # imgabs 2 #, the reflectivity of the front surface of the optical filter is # imgabs 3 #, and the reflectivity of the rear surface of the optical filter is # imgabs 4 #; measuring the reflectivity of the detector, wherein the reflectivity of the surface of the detector is # imgabs5 #; the thickness # imgabs 6 # of the optical filter is measured, and the distance # imgabs 7 # between the optical filter and the detector is measured; ghost image analysis is carried out through an illuminance distribution function of the ghost image and energy, radius, coordinate calculation formulas and the like; the method achieves the quantitative analysis of the specific position, shape and magnitude of the ghost image for the first time, and can be used for the generation of a scientific simulation image.

A rod lens array 10a includes a plurality of gradient-index rod lenses 1b arrayed to have optical axes parallel to each other, and forms an erecting equal-magnification image. The gradient-index rod lenses 1b each have a refractive-index distribution in a radial direction thereof. The refractive-index distribution n(r) is approximated by n(r)=n0·{1−(A / 2)·r2}, where a refractive index at a center of the gradient-index rod lens 1b is represented by n0, a refractive-index distribution constant of the gradient-index rod lens 1b is represented by √A, and a distance from the center of the gradient-index rod lens 1b is represented by r. The gradient-index rod lens 1b has an aperture angle θ of 3 to 6°, the aperture angle θ represented by θ=sin−1(n0·√A·r0), where a radius of the gradient-index rod lens is represented by r0. The rod lens array 10a has an imaging distance of 45 to 75 mm and a depth of field of 1.5 to 3.0 mm with value of modulation transfer function (MTF) of 30% or more at a spatial frequency of 6 lp / mm.

[Problem] To provide an optical system capable of imaging for obtaining an omnidirectional image of high image quality. [Solution] The optical system has a first negative lens Gn1. The optical system satisfies the condition 90° < θ1 ≤ 180°, where θ1 is defined as the half-open angle at the effective diameter position of the lens surface on the object side of the first negative lens.