7 results about "Aperture angle" patented technology

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 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.

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.

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.

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.