18 results about "Köhler illumination" patented technology

This invention relates to the field of water radiance measurement technology, and particularly to an enhanced water radiance sensor based on a polarizing filter. The sensor comprises a polarizing filter, a Kohler illumination system, a shaping fiber bundle, a spectrometer, and a host computer, arranged sequentially. The polarizing filter is positioned at a preset position at the front end of the optical path of the Kohler illumination system, which converts natural light from the water surface into a uniform and controllable light source. The incident end of the shaping fiber bundle is connected to the Kohler illumination system, and the exit end is connected to the spectrometer. The spectrometer is connected to the host computer. The water radiance passes sequentially through the polarizing filter, the Kohler illumination system, and the shaping fiber bundle before entering the spectrometer. The spectrometer converts the received optical signal into an electrical signal and transmits it to the host computer. The advantage of this invention is that by employing the Kohler illumination system, the field of view of the enhanced water radiance sensor is reduced to ±2°, solving the problem of poor glare suppression under large field of view in traditional sensors.

The invention discloses an angle continuously adjustable super-resolution microscope illumination device and method. The device comprises a light beam coupling assembly; an LED-DMD excitation light path and a digital micromirror array perform intensity modulation on Kohler illumination light according to a loaded intensity distribution reference pattern, a first light beam is reflected, and the first light beam is projected to a sample plane through a light beam coupling assembly and a conjugate light path in sequence; an SLM-Laser excitation / light control light path, a spatial light modulator performs phase modulation on parallel light according to a loaded phase distribution reference pattern to generate a second light beam, and the second light beam is coupled with the first light beam through a light beam coupling assembly and then is projected to a sample plane; the excitation mode switching module is used for switching a conjugate surface to realize TIRF illumination or spot scanning excitation; the control system realizes seamless switching between a preset light control imaging mode and a real-time light control imaging mode. The problems that a traditional super-resolution microscope is single in function, high in phototoxicity, poor in adaptability and the like are solved, and a more powerful imaging platform can be provided for biomedical research.

According to the full-field coherence tomography device and method based on ultrasonic rotation and bidirectional interference, a Kohler illumination system forms parallel light which enters an interference and shunt unit, and the interference and shunt unit divides the entering light into a reference arm and a sample arm; the sample arm unit divides a sample arm light path into two sample light paths to irradiate the upper side and the lower side of the same sample; the reference arm unit realizes optical path selective matching of phase displacement and two sample optical paths; the ultrasonic rotating unit enables the sample to be in a non-contact suspension state and rotate according to a set angle so as to obtain multi-direction interference information; the imaging and acquisition unit focuses and detects light returned by the reference arm and the sample arm; and the switching and fusion unit switches the state of the reference arm, so that the reference arm is respectively matched with the two sample light paths, interference acquisition, demodulation and three-dimensional reconstruction of interference fringes and fusion of up-down bidirectional and multi-angle data are completed, and a high-penetration three-dimensional imaging result is obtained. According to the invention, the penetration depth can be enhanced, the three-dimensional reconstruction quality is improved, and non-contact operation is realized.

The application discloses an optical element subsurface defect detection method and system based on phase contrast digital holography, and belongs to the field of precision measurement technology; the system adopts annular Bessel beam Kohler illumination, utilizes polarization modulation technology and a specially-made polarization contrast ring to realize synchronous four-step phase shift high-speed quantitative phase measurement in a U-shaped light path; the method acquires complex amplitude through a polarization camera, compensates for resolution loss by using a self-supervision super-resolution reconstruction algorithm fused with a physical model; full-field and local inverse diffraction reconstruction is carried out based on angular spectrum diffraction theory, high-precision depth positioning is realized based on the diffraction light complex amplitude distribution characteristics as a focusing criterion; three-dimensional information representation of defects is realized in combination with an optical field scattering and diffraction model and a machine learning algorithm; the application can realize high-sensitivity, high-signal-to-noise ratio, real-time in-situ quantitative detection and three-dimensional reconstruction of submicron defects without significantly increasing the cost.

The invention discloses a microscopic imaging system for dual-band LED illumination and a use method thereof.The microscopic imaging system comprises a dual-band illumination module, a double telecentric objective lens, a high-power imaging system and a low-power imaging system.The dual-band illumination module adopts a red light and blue light dual-band LED light source and combines the Kohler illumination technology to achieve the high-uniformity illumination effect; the high-magnification imaging system and the low-magnification imaging system both adopt double telecentric optical design, telecentric degrees of an object space and an image space are ensured to be smaller than or equal to 0.2 degree, meanwhile, the characteristic of large depth of field is obtained through collaborative design of optical parameters, a high-precision automatic focusing module is integrated, imaging definition is judged through an image definition evaluation algorithm, a high-magnification telecentric imaging lens group and a low-magnification telecentric imaging lens group are automatically adjusted, and rapid focusing is achieved. The problems that a traditional microscopic system is large in magnification error, insufficient in depth of field, low in focusing efficiency and poor in illumination stability are solved, and high-magnification and low-magnification simultaneous imaging is achieved.

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.

A microscope is configured for brightfield and darkfield illumination using Kohler illumination. An illuminator provides a first radiation pattern that passes through the microscope's objective lens for brightfield illumination and provides at least one second radiation pattern that also passes through the objective lens for darkfield illumination.

The present application provides a method for calibrating the optimal diffuser position of a Kohler illumination system. First, an initial measured object dynamic image is collected by an image sensor when a diffuser rotates to an initial position, and whether the deviation displacement vector of at least one speckle keeps converging in a predetermined range is analyzed according to the initial measured object dynamic image. Then, if the deviation displacement vector of the speckle keeps converging in the predetermined range, the initial position of the diffuser is defined as the optimal diffuser position with the best light field uniformity. Otherwise, the position of the diffuser is adjusted until the deviation displacement vector of the speckle keeps converging in the predetermined range, and the corrected position of the diffuser is defined as the optimal position with the best light field uniformity.

The application discloses a low-cost universal virtual phase contrast method and device based on a cylindrical lens; the method comprises the following steps: adding a cylindrical lens in a common bright field microscope of a Kohler illumination structure, so that the illumination light source forms asymmetric illumination, and a bright field image is obtained; a strong image carries more phase information; the obtained bright field image is input into a conditional generative adversarial neural network under credibility negative feedback after training, and a virtual phase contrast image is generated, so that the effect equivalent to a standard phase contrast image is realized at low cost. The application not only realizes the effect similar to the standard phase contrast microscope at low cost, but also is superior to the image of the standard phase contrast microscope in some applications (cell segmentation, cell recognition, etc.), and expands the application potential of the application in the fields of biomedicine, material science and the like.

The utility model relates to the technical field of optical detection, in particular to a lighting system. By adopting the illumination structure formed by coupling at least two light sources, the problem of insufficient illumination brightness in a tiny area can be solved, the system can be used in cooperation with multiple line scanning cameras at the same time, the detection rate can be improved, the system adapts to a specific rapid detection field lens, and implementation is easy. The whole lighting system is clear in modular structure, the number of lenses is reduced, and production cost is reduced. According to the double telecentric Kohler illumination, high-brightness and high-uniformity illumination can be realized, a fuzzy edge caused by diffuse reflection can be eliminated, and the illumination view field and the angle of incident light can be controlled through the view field diaphragm and the pupil control module, so that the defect detection precision is improved.

The invention discloses a light current microscopic device with light modulation and real-time monitoring functions and a modulation method. The device comprises a bottom plate, a microscopic system support, a sample table, an objective lens, a microscopic imaging layer, a wide-field light excitation layer and a point focusing light excitation layer. Wherein the microscopic imaging layer collimates, filters, reflects and focuses broadband light to a rear focal plane of the objective lens to realize Kohler illumination, and sample light returned by the objective lens is reflected and imaged to the camera; the wide-field light excitation layer collimates the wide-field light, adjusts the power, polarization direction and light spot shape, and reflects and focuses the wide-field light to the rear focal plane of the objective lens to realize wide-field light excitation; after the point focusing light excitation layer collimates and reflects laser and adjusts power, the polarization direction and the spot size are adjusted, and the laser is focused to a sample table through an objective lens after being reflected for multiple times to achieve point focusing light excitation. The device can modulate the laser wavelength, power and the like, monitors the optical power in real time, meets the excitation light modulation requirement, is compatible with more tests and reduces the operation complexity.

The application discloses a device and method for capturing and operating biomass aerosol based on fiber optical tweezers, which comprises a laser, an isolator, a beam expander assembly, a first half-wave plate and a polarization beam splitter for splitting the laser beam into a first laser beam and a second laser beam, which are arranged along the optical path of the laser beam in sequence, and a single-mode optical fiber, a multi-mode optical fiber, a spatial light modulator and an aerosol capture chamber; the first laser beam and the second laser beam are coupled into the input ends of the multi-mode optical fiber and the single-mode optical fiber respectively, and the output ends of the multi-mode optical fiber and the single-mode optical fiber enter the aerosol capture chamber; the spatial light modulator is used for modulating the input light field of the multi-mode optical fiber to create an optimized focal point in the output light field; and the aerosol capture chamber is provided with a first CMOS camera, a long-focus objective lens and a Kohler illumination system. The device for capturing and operating biomass aerosol of the application overcomes the two major limiting problems of traditional single biomass aerosol particle capture and operation.

The utility model discloses a kind of wafer thickness measurement systems, including pedestal, motion module, microscopic imaging module, white light interference thickness measurement module and industrial control linkage control unit. Microscopic imaging module includes microscopic illumination light source, Kohler illumination component, first light splitting module, microscopic objective lens, barrel lens, second light splitting module and imaging module;White light interference thickness measurement module includes white light source, fiber coupler, spectrometer and fiber receiving end. Imaging module and fiber receiving end are connected with shared microscopic objective lens, barrel lens via second light splitting module, and fiber receiving end is equipped with Z direction adjusting mechanism and XY adjusting mechanism;Control unit controls two light sources time-sharing work. The system can realize the visualization positioning and film thickness measurement of sample measurement area.

Systems, methods, and devices for providing Köhler illumination for inspection, under a microscope, of end connectors of fiber optic cables. In one aspect, a microscopy system provides Köhler illumination where a numerical aperture of the illumination (NAIL) is greater than a numerical aperture of imaging (NAIM). In another aspect, a reflected light microscopy system includes an array of light sources which illuminate a diffuser, which, in turn, projects the diffused light to reflect off of a beamsplitter and through an objective / condenser upon the end connector. In yet another aspect, the array of light sources may provide different light patterns to illuminate the end connector, and each light pattern may correspond to a different type of radiused end connector.

This application provides a method for adjusting a detection device. The detection device, from the object side to the image side, includes an objective lens, a beam splitter, a telescope, and a detector, and also includes a Kohler illumination module. An illumination beam is emitted from the Kohler illumination module, transmitted through the beam splitter to the objective lens. When the object to be tested is placed on the side of the objective lens away from the beam splitter, a reflected beam is obtained by reflecting the illumination beam emitted from the objective lens. The reflected beam passes sequentially through the objective lens, beam splitter, and telescope to the detector. After inserting an aperture stop in the Kohler illumination module and placing a first auxiliary lens between the telescope and the beam splitter, the detector obtains the first spot position of the light spot formed by the aperture stop at the entrance pupil of the objective lens. When the Kohler illumination module does not provide an illumination beam and the light source is used as the object to be tested, the detector obtains the second spot position of the light spot at the entrance pupil of the objective lens. The position of the aperture stop is adjusted according to the first and second spot positions to align the illumination optical axis and the imaging optical axis.

The application discloses an imaging system, a light generating module forms parallel light with uniform light energy distribution from light emitted by a light source and emits the parallel light, a turning module guides the parallel light emitted by the light generating module to propagate, and the parallel light is obliquely irradiated to a sample. The imaging module comprises a lens assembly and a light intensity modulation element, the lens assembly collects light transmitted through the sample and performs imaging based on the light transmitted through the sample, and the light intensity modulation element is used for attenuating light energy of different regions of a cross section of light entering the lens assembly at different attenuation rates, so that there is a brightness difference between different regions of a sample image obtained by the imaging module. The imaging system of the application can avoid using Kohler illumination and can make the illumination light path structure relatively simple. The parallel light is obliquely irradiated to the sample by the turning module, so that the imaging system is more convenient to assemble and adjust. The application further discloses a cell incubator.

Optical arrangement (1) for efficient coupling of a sample light (2') into an optical analyzer (18), the optical arrangement (1) comprising: a Köhler illumination optics (6) for receiving a light (2) emitted from at least one light source (10) and comprising at least one field stop (9); a transmission sample space (3) for receiving a sample (5); and a coupling optics (12) comprising a coupling exit (14) for being coupled to the optical analyzer (18), wherein the Köhler illumination optics (6), the transmission sample space (3) and the coupling optics (12) define at least partially an optical pathway for the light (2) received by the Köhler illumination optics (6), and the Köhler illumination optics (6) being configured to illuminate with the light (2) at least partially a sample (5) when being received by the transmission sample space (3) and to generate in the sample (5) an image (11) of the at least one field stop (9), and wherein the coupling optics (12) is configured to receive the light (2) which is transmitted through the sample (5) being the sample light (2') and to project, together with the image (11) of the at least one field stop (9), an image (15) of the sample (5) at least partially onto the coupling exit (14).

This invention relates to the field of semiconductor manufacturing technology and discloses a mask inspection device and method based on optical path technology, including an optical imaging system, a dark field illumination system, a reflective coaxial illumination system, a transmittance coaxial illumination system, and an autofocus system. The dark field illumination system is located in the bottom region of the optical imaging system, and the mask to be inspected is located at the bottom of the dark field illumination system. The reflective coaxial illumination system is located in the side region of the optical imaging system, and the transmittance coaxial illumination system is located in the bottom region of the mask. This invention employs a four-stage compression design of a light source, a light-collecting lens, a field lens, and a condenser lens in the transmittance optical path. Combined with a planar reflector to fold the optical path, the total length is 35% shorter than that of a Köhler illumination system. Therefore, it has a shorter optical path than traditional Köhler illumination, occupies less space, and is easier to integrate and use.