10 results about "Airy disk" patented technology

The invention relates to the technical field of spectrometers, in particular to a small Airy spot spectrograph for optical coherence tomography, the wave band of a used light source is a near-infrared wave band, and the small Airy spot spectrograph comprises a collimation unit, a grating unit, a focus lens group and a linear array camera; the collimation unit is a large-aperture reflection-type optical fiber collimator and is used for carrying out collimation and shaping processing on interference spectrum signals acquired by the acquisition end of the SD-OCT system through light beams emitted by an optical fiber patch cord; the grating unit is a transmission-type diffraction grating and is used for carrying out diffraction light splitting on the collimated light beam to obtain light with different diffraction angles and different wavelengths; and the light beams with different wavelengths after diffraction and light splitting are focused on the light sensing surface of the linear array camera by the focusing lens group. According to the invention, the aberration is optimized, so that the performance of the SD-OCT system is close to the diffraction limit, and the roll-off degree of the SD-OCT system can be reduced; the incident beam diameter is increased, and the Airy spot radius of the system is reduced.

The present invention provides a 40x infinite conjugate microscope objective lens, which relates to the field of objective lenses. The 40x infinite conjugate microscope objective lens includes a first lens group, a second lens group, and a third lens group, which are arranged in sequence along the optical axis from the object side to the image side. The first lens group includes a first lens and a second lens, which are arranged in sequence along the optical axis from the object side to the image side. The second lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, which are arranged in sequence along the optical axis from the object side to the image side. The third lens group includes a tenth lens and an eleventh lens, which are arranged in sequence along the optical axis from the object side to the image side. The 40x infinite conjugate microscope objective lens can achieve high resolution, a flat image plane, and an achromatic objective lens. At a shorter parfocal distance, the numerical aperture is larger, the illumination at the image plane is increased, and the image is clearer. The on-axis field of view and the off-axis field of view are both close to the diffraction limit, and the point array radius is also close to within the Airy disk.

The invention relates to the technical field of optical data processing, in particular to an optical image simulation and data set automatic generation method, which comprises the following steps of: firstly, shooting an original image; taking a zero-aberration point spread function as an Airy spot convolution kernel, and performing convolution operation on the shot original image by using the Airy spot convolution kernel to obtain an ideal image reflecting a diffraction limit condition; taking the point spread function of the specified aberration as an aberration convolution kernel, and performing convolution operation on the shot original image by using the aberration convolution kernel to obtain a simulated aberration image; and synchronously cutting the obtained ideal image and the simulation aberration image to obtain a simulation data set. According to the method, a zero-aberration point spread function is used as an Airy spot convolution kernel, a point spread function of a specified aberration is used as an aberration convolution kernel, parameterized convolution is carried out on an original image, and an ideal-aberration strict paired image is efficiently obtained; through consistent cutting and unified file storage mapping, standardized organization and traceable management are realized.

The utility model discloses a laser directivity test structure which comprises a laser, an Airy spot generation module and an optical screen. The laser is used for generating laser; the Airy spot generation module is used for receiving the laser and enabling the laser to be diffracted so as to generate Airy spots and imaging the Airy spots on the optical screen, so that the change condition of the laser along with time is reflected through the deviation degree of the dark spot center of the Airy spots and the center of the optical screen; wherein at the initial time, the dark spot center of the Airy spot is aligned with the center of the optical screen, and the position of the Airy spot on the optical screen changes along with the change of the directivity of the laser. By utilizing the structure, the laser directivity is more accurately determined by generating the Airy spot and observing the deviation degree between the dark spot center of the high-resolution Airy spot and the center of the optical screen, and the laser directivity detection device is simple in structure, easy to integrate and wide in application range.

The present invention discloses a video conferencing lens, which is composed of a first concave-convex negative lens, a second concave-convex negative lens, a first biconvex positive lens, a third concave-convex negative lens, a second biconvex positive lens, a meniscus positive lens, a meniscus negative lens, a third biconvex positive lens, a fourth concave-convex negative lens, and a flat protective glass. The present invention has a diagonal imaging field of view of 90°, achieving wide-angle imaging. While maintaining excellent performance in various indicators, the first lens has an aperture of 10 mm and a total system length of 20.7 mm, facilitating optical and mechanical integration in practical applications of the video conferencing lens. Aberration correction over a wide field of view is achieved using only two even-order aspheric surfaces plus a spherical surface, and vertical axis chromatic aberration can be corrected to within the Airy disk, resulting in low cost and excellent chromatic aberration correction capabilities.

The invention discloses a standard spherical lens with an ultra-large relative aperture. The standard spherical lens sequentially comprises a diaphragm, a first lens, a second lens, a third lens and a fourth lens from an infinite object space to an image space along an optical axis. And the four lenses are spherical single lenses made of a glass material with a high refractive index coefficient. The spherical standard lens is matched with a laser interferometer and is used for high-precision detection of the spherical surface shape. The relative aperture D / f of the lens is larger than or equal to 2.75, Fno is smaller than or equal to 0.365, the light wave convergence angle is 2U'gt, 156 degrees, the focusing light spot is far smaller than the diffraction Airy spot, high-precision detection of the concave spherical surface shape with the ratio of the half aperture to the curvature radius close to 1 can be achieved, the lens structure is simple and compact, the imaging quality is ensured, and meanwhile the design and machining difficulty of each lens is low.

The invention discloses an intermediate infrared star light interference fringe generation and aberration suppression evaluation system and method based on 4F system spatial filtering. The system is applied to coherent interference measurement of mid-infrared band fixed star light in astronomical observation. The system comprises a telescope collimation unit, an aberration equivalent unit, a 4F relay light path unit, an adjustable pinhole spatial filtering unit arranged on a 4F middle focal plane, a reference light generation and phase tilt modulation unit and a coherent superposition and interferogram output unit. By arranging the pinhole, the wavefront high-spatial-frequency component of the test arm is cut, so that the influence of atmospheric turbulence or high-order aberration on interference fringes is reduced, and the regularity of the fringes is improved. The system further provides a parameterization strategy for setting the pinhole size with the Airy spot radius as a scale, and interference fringes under different pinhole multiplying power can be subjected to comparative analysis and wavefront diagram PV value calculation. The method is suitable for the scenes of intermediate infrared coherent imaging, wavefront shaping, spatial filtering teaching demonstration and the like.

In one embodiment, a method includes accessing an image captured by an imaging system that includes an aperture and an optical sensor, wherein the imaging system blurs the image; and de-blurring the image by applying an Airy-disk correction that attributes at least part of the blurring in the image to a circular aperture rather than to a pinhole aperture.

The application discloses an exposure writing field splicing method of an electron beam spherical grating, and the splicing process comprises the following steps: calculating the writing field size; calculating the writing field splicing interval of the spherical grating; focusing on a spherical reference point and locally exposing; identifying the writing field splicing error; adjusting and controlling the writing field splicing error; modifying and compensating the consistency of the writing field pattern of each region of the spherical grating; and exposing by the electron beam after converting the error of the whole region writing field. The exposure writing field splicing method of the electron beam spherical grating provided by the application guarantees the consistency of the writing field splicing and the pattern of each region of the spherical grating, reduces the surface roughness of the electron beam spherical grating, avoids the appearance of the secondary peak of the imaging Airy disk caused by the splicing error, and guarantees the imaging quality and the spectral resolution of the spectral instrument.

This invention discloses an image enhancement method combining computational optical modulation and neural networks, belonging to the fields of optical engineering, computational imaging, and computer vision. The method acquires low-resolution images with physical degradations such as diffraction limitations and wavefront distortion. It calibrates the digital modulation transfer function (MTF) based on the intensity ratio of the superoscillating spot to the Airy disk in the spatial spectral domain, and performs frequency-domain digital pupil modulation using a wavefront aberration modulation matrix, constructing a low-resolution dataset containing hardware degradation realities. Then, it trains a neural network using high-resolution images as labels to establish a super-resolution mapping model. In real-time processing, the test image is input into the trained model for inference, and a high-fidelity super-resolution reconstructed image is output for display or storage. This invention does not require changes to the front-end optical structure, improves high-frequency detail loss and edge blurring problems, and enhances image clarity and fidelity.