312 results about "Telecentric lens" patented technology

The invention provides a focus-adjustable liquid double telecentric lens and intelligent production equipment, and relates to the technical field of optical lenses. The focus-adjustable liquid double telecentric lens comprises a first lens, a second lens, a third lens, a liquid lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object space to an image space along an optical axis; the first lens is a biconvex lens with positive focal power, the second lens is a biconvex lens with positive focal power, the third lens is a biconcave lens with negative focal power, the fourth lens is a biconcave lens with negative focal power, the fifth lens is a biconvex lens with positive focal power, and the sixth lens is a biconvex lens with positive focal power. Wherein the focusing position of the focusable liquid double telecentric lens is changed by adjusting the driving voltage or the driving current of the liquid lens, and rapid focusing under different working distances is completed. According to the embodiment of the invention, the system is small in size, and is excellent in imaging quality in a large depth-of-field range.

The invention relates to the technical field of precision measurement, and discloses an industrial camera ball target array calibration plate and a pixel calibration method for a telecentric lens, and the calibration plate comprises a calibration plate which is a ball target array calibration plate and is suitable for the pixel size calibration of an industrial camera using the telecentric lens. The calibration plate is composed of a ball target array base and a high-precision ball target, a pixel size calibration method for the industrial camera using the telecentric lens is provided, the industrial camera collects a ball target fixed plate image, sub-pixel edge coordinates of the ball target are obtained through image processing, circle fitting is conducted on the sub-pixel edge of the ball target, and the diameter is calculated; the invention provides a high-precision calibration method for the pixel size of the industrial camera using the telecentric lens, the full-domain pixel size calibration of the field of view of the lens can be realized, and the calibration result is accurate and reliable.

The invention relates to 3D-AOI detection equipment and a three-dimensional reconstruction method. According to the method, an optical machine, a first industrial camera, a plurality of second industrial cameras and a coaxial telecentric lens are included; the optical machine is connected with the coaxial telecentric lens and is used for emitting structured light, and the structured light enters from the side view of the coaxial telecentric lens and is vertically projected to the measured object after being reflected by the inclined plane of an internal reflective mirror; the imaging end of the first industrial camera is in view connection with the top surface of the coaxial telecentric lens, and a light path of the first industrial camera penetrates through the center of the coaxial telecentric lens and extends to a measured object; the plurality of second industrial cameras are arranged around the first industrial camera, and the lens of each second industrial camera is aligned with a measured object at a set inclination angle. By adopting the method, the scanning efficiency can be improved.

The invention discloses an all-in-one eyeball comprehensive parameter measuring instrument and a method for measuring eyeball parameters by using the same. The measuring instrument comprises a signal light source, a signal light source sample arm, a signal light source reference arm, a scale light source, a scale light source sample arm, a scale light source reference arm, an annular light source, a telecentric lens, a zoom lens group and the like, the instrument can measure biological parameter information of human eyes, corneal curvature and eyeball diopter at the same time. The device is scientific and reasonable in design, and has the advantage that the curvature, the diopter and the biological parameters of the human eyes can be simultaneously measured at one time under the non-contact and non-invasive conditions.

The present invention discloses a device and method for semiconductor grain double-sided simultaneous fully equal optical path confocal imaging detection based on polarization separation imaging method. The device includes a CMOS or CCD polarization camera, a telecentric imaging lens, a polarization cube beam splitter, a right-angle image rotation prism, a semiconductor grain, and a transparent glass stage for placing the semiconductor grain, which are sequentially arranged in the optical path direction. The advantages of the device and method of the present invention are as follows: It can achieve double-sided simultaneous fully equal optical path confocal polarization imaging detection of the object to be measured, that is, △ = 0, without the need to use a large-depth-of-field telecentric lens to compensate for the optical path difference of double-sided imaging; the double-sided simultaneous polarization imaging detection device has a simple and compact structure and is easy to assemble and debug.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for characterizing a particulate ingredient of a mixture including a hopper configured to dispense particles along an axis and in freefall through an imaging region, an illumination sub-system including at least one light source arranged at a first location with respect to the axis and configured to illuminate the imaging region, an image capture sub-system including at least one image capture device including a telecentric lens and arranged at a second location with respect to the axis and configured to align a focal plane of the at least one image capture device with the axis within the imaging region, such that when a particle freefalls through the imaging region, the particle is illuminated by the illumination sub-system and the image capture sub-system captures images of at least three silhouettes of the particle within the imaging region.

The invention belongs to the field of image spectrum detection, and particularly relates to a high-precision detection device and method for a liquid meniscus contour in a capillary tube. Comprising a telecentric lens, an industrial camera, a displacement platform, a light source, a capillary tube and a culture dish, the industrial camera, the capillary tube and the culture dish are installed on different displacement platforms respectively, the light source is provided with a rotary telescopic rod and can move in all directions, when the liquid meniscus contour in the capillary tube is shot, the light source, the meniscus of the capillary tube and the industrial camera are adjusted to be aligned to the same horizontal plane, and on the basis of the telecentric imaging principle, according to the light refraction principle, the liquid meniscus contour in the capillary tube is obtained. And deriving a distortion correction function of the meniscus contour in the capillary tube. According to the invention, the industrial camera and the telecentric lens are matched for use, the problem of shape distortion caused by object distance change is avoided, and the difficulty of image distortion correction is reduced. The meniscus contour distortion correction function derived based on the telecentric imaging principle can accurately calculate the actual value of the meniscus contour and restore the actual meniscus contour.

The utility model discloses a chip defect multi-face detection device which comprises a detection shell, a display mechanism used for chip multi-face display is installed on the detection shell, a camera is installed in the detection shell, and an adjusting mechanism used for driving the camera to adjust the size of a light spot in the detection shell is further installed on the detection shell. According to the utility model, through the cooperation of the rectangular prism module, the surface light source, the beam splitter prism and the mesopore surface light source, the four rectangular prisms are closed together to form a square chamber, and the chip is placed in the square chamber, so that a camera can detect the front surface and four side surfaces of the chip at the same time; through the arranged adjusting mechanism, the product is small, a telecentric lens needs to be used, and the working distance of the telecentric lens is relatively fixed, so that in order to facilitate focusing, the device is provided with the focusing adjusting mechanism, the position of the telecentric lens can be adjusted through a knob, and a shot picture can be clearly displayed.

The utility model relates to a symmetrical double telecentric lens, and relates to the technical field of measurement and control instruments in accurate manufacturing. Comprising an incident lens group, an imaging lens group and a diaphragm. The diaphragm is arranged between the incident lens group and the imaging lens group, and the focal lengths of the incident lens group and the imaging lens group are the same; and the incident lens group and the imaging lens group at the two sides of the diaphragm are respectively provided with seven lenses with the same number. According to the invention, an object is imaged according to the object-image proportion of 1: 1 through a small number of lens groups, so that the vision is more visualized, the illusion of people or interpretation errors caused by image distortion due to an image magnification or reduction mode are reduced, the authenticity is improved, and people can easily distinguish detail features of the object on a large-target-surface sensor. The problems that the number of built-in lenses of an existing lens is large, the magnification and imaging stability are insufficient, and the requirement for high precision cannot be met are solved.

The invention discloses a method for detecting internal defects of a folded optical path lens. The method comprises the following steps: driving a telecentric lens to move step by step in the vertical direction based on a Z-axis motion mode so as to focus the telecentric lens; step size is set, positions of a plurality of telecentric lenses are obtained, images of different positions of the folded optical path lens are collected based on the focused telecentric lenses, and a detection image set is obtained; obtaining a gray value of the detection image set to obtain gray value distribution information of different positions; performing definition detection on the detection image set, and analyzing the definition of the images at different positions; defect information is obtained based on gray value distribution information and definition of images at different positions, image acquisition of different layers of the lens by different depths of field is sequentially realized through a large-target-surface camera according to a stepping mode, defect positions and defect depths are analyzed according to image gray values, and defect types are accurately analyzed.

The invention relates to the technical field of ultrasonic scanning microscopes, in particular to a system and a method for measuring surface unevenness and warping of an ultrasonic scanning microscope. The system comprises a water tank, a light emitting device, a light receiving device and a signal processing module, the light emitting device generates line laser through a semiconductor laser and an optical shaping module, and scanning is achieved through a high-precision galvanometer. The light receiving device is provided with a narrow-band filter, a telecentric lens and a CMOS sensor and is used for capturing a light spot image; the signal processing module integrates sub-pixel positioning, galvanometer nonlinear correction, self-adaptive filtering and temperature compensation algorithms, light spot center sub-pixel-level positioning is achieved through Gaussian curved surface fitting, galvanometer correction and temperature drift compensation are combined, the measurement precision and stability are improved, and finally high-precision height information is fed back to an ultrasonic scanning system. According to the invention, the accuracy and reliability of surface unevenness and warping measurement are improved.

The invention provides a high-power laser diameter measuring device, which is characterized in that a first reflector and a second reflector are respectively arranged on a light path of a to-be-measured high-power laser beam entering a detector, and the part, shielded by the first reflector, in the laser beam is reflected to a first collector by the first reflector; the part, shielded by the second reflector, in the laser beam is reflected to the second collector by the second reflector; the first reflector and the second reflector are both installed on the first support, and the first support is integrally installed on a displacement table set composed of a first displacement table and a second displacement table through a connecting plate. The first telecentric lens, the first image sensor, the second telecentric lens and the second image sensor are respectively used for real-time observation of the first reflector and the second reflector. The high-power laser diameter measuring device provided by the invention can reduce the source of diameter measurement errors and improve the measurement accuracy, can be used for directly measuring the laser diameter, and can also be used as a measurement standard device to calibrate other high-power laser spot analyzers.

The invention discloses a surface topography measurement device and method based on polarization phase shift. The device comprises a laser module, a polarization beam splitting and interference module, a polarization beam combining and imaging module, a polarization image acquisition module and a control and reconstruction module. The laser module comprises a monochromatic tunable laser, an optical fiber collimating amplifier and a polarizer; the polarization beam splitting and interference module comprises a polarization beam splitting prism, a first quarter-wave plate, a plane mirror and a second quarter-wave plate; the polarization beam combining and imaging module comprises a polarization splitting prism, a third quarter-wave plate and a telecentric lens; the polarization image acquisition module comprises a micro-polarization array camera and an image processing unit, and the micro-polarization array camera synchronously acquires four polarization interference images through single exposure; and the control and reconstruction module obtains measurement data of the surface topography of the to-be-measured object through a phase unwrapping algorithm and three-dimensional topography reconstruction. According to the invention, high-precision, large-field-of-view, portable and high-efficiency field detection can be realized.

Exemplary embodiments relate to a light detection and ranging (LIDAR) device having a light guide manifold. The exemplary LIDAR device includes a transmit subsystem. The transmit subsystem includes a light emitting element. The transmit subsystem also includes a light guide manifold optically coupled to the light emitting element. Furthermore, the transmit subsystem includes a telecentric lens assembly optically coupled to the light guide manifold. The LIDAR device also includes a receive subsystem. The receive subsystem includes a telecentric lens assembly. The receive subsystem also includes an aperture plate having an aperture defined therein. The aperture plate is positioned at a focal plane of the telecentric lens assembly. Furthermore, the receive subsystem includes a silicon photomultiplier (SiPM) positioned to receive light traveling through the aperture.

The invention discloses an object space telecentric lens with a long working distance and a large numerical aperture. The object space telecentric lens comprises a front lens group, an aperture diaphragm and a rear lens group which are sequentially arranged from an object space to an image space along an optical axis of the lens. The front lens group comprises a first lens with positive focal power, a second lens with positive focal power, a fourth lens with positive focal power, a sixth lens with positive focal power, an eighth lens with negative focal power, a third lens with negative focal power, a fifth lens with negative focal power, a seventh lens with negative focal power and a ninth lens with negative focal power, the eighth lens and the ninth lens form a second group of doublet lenses, and the fifth lens, the sixth lens and the seventh lens form a first group of triplet lenses. The rear lens group includes a tenth lens and a twelfth lens having positive refractive power, and an eleventh lens and a thirteenth lens having negative refractive power. According to the invention, the thirteen spherical glass lenses are adopted, and the focal power of each lens is reasonably distributed, so that the lens has the advantages of long working distance, large numerical aperture, ultrahigh resolution, high relative illumination, wide spectral range, high telecentricity and the like, and the problem of low resolution of a long-working-distance object space telecentric lens is solved. The measurement precision of the detection lens is improved, and the requirements of some application scenes for higher-performance lenses are met.

The invention discloses a method for automatically detecting surface defects of an optical prism and a detection system. The system comprises an image acquisition module, a light source module, a mechanical loading module and a control processing module. The image acquisition module acquires multi-angle images through a high-resolution area-array camera and a telecentric lens; the light source module combines a coaxial light source and a low-angle annular light source to enhance the defect contrast; the mechanical object carrying module is an electric object carrying table capable of accurately rotating; the control processing module comprises an image preprocessing unit, a defect recognition unit and a classification output unit, and can automatically recognize defect types such as scratches, stains, bubbles, broken edges and hard spots and output size and position parameters of the defects. In the aspect of the method, a score calculation formula is designed for stain and broken edge defects, and classification and recognition are realized by combining gray analysis, edge extraction and a lightweight neural network. The method has the advantages of comprehensive detection types, high precision, strong adaptability and the like, and is suitable for large-scale quality inspection links of optical elements.

A 3D imaging system, a calibration method and calibration apparatus therefor, and a calibration device. The calibration method comprises: acquiring a calibration image, which is obtained by using a telecentric lens (110) to collect a first calibration target; performing calibration on the telecentric lens (110) according to the calibration image, so as to obtain a first initial calibration parameter of the telecentric lens (110); according to the first initial calibration parameter, determining second coordinates of a reference point, which corresponds to first coordinates, with respect to a coordinate system of a target projection optical machine (120); according to the second coordinates, performing calibration on the target projection optical machine (120), so as to obtain a second initial calibration parameter of the target projection optical machine; and according to the first coordinates, the second coordinates, the first initial calibration parameter and the second initial calibration parameter, performing joint calibration on the telecentric lens (110) and the target projection optical machine (120), so as to obtain a target calibration parameter. Thus, the calibration of a 3D imaging system is realized, the imaging accuracy of the calibrated 3D imaging system can be improved, and the missing of 3D information of components caused by occlusion is avoided.

The invention provides a product dimension and form and location tolerance measuring device and method based on machine vision, an external dimension detection module of the measuring device comprises a detection rotating mechanism, one side of the detection rotating mechanism is provided with a linear array camera and a telecentric lens which move axially, and the other side of the detection rotating mechanism is provided with a parallel light source which moves axially; the internal dimension detection module comprises an axial moving mechanism, the axial moving mechanism is arranged at the end part of the detection rotating mechanism, and a laser displacement sensor rotating in the circumferential direction is arranged on the axial moving mechanism; the image and data processing system comprises an image acquisition module, an image positioning module, an image contour processing module, a size calculation module and a data analysis processing module which are connected in sequence, the image acquisition module is connected with the linear array camera, the size calculation module is further connected with the data acquisition module, and the data acquisition module is connected with the laser displacement sensor. Non-contact automatic measurement is adopted, the appearance of a pipe product is prevented from being damaged, and the detection precision and efficiency are improved.

The present invention relates to a device and method for three-dimensional detection of surface defects of large-aperture curved optical elements, belonging to the field of three-dimensional detection of surface defects of optical elements. The device includes a mobile platform, a 3D line spectrum confocal sensor, a calibration head, an industrial camera, a telecentric lens, a ring light source, a point light source, and a camera axis fine-tuning device, etc. The method includes the following steps: positioning and focusing the element to be tested; scanning the 3D line spectrum confocal sensor to obtain the defect position and three-dimensional information of the defect; switching to a two-dimensional defect detection module to obtain two-dimensional information of surface defects; and comprehensively analyzing the two-dimensional information and the three-dimensional information to obtain the three-dimensional detection results of each defect on the surface of the element to be tested. The present invention realizes rapid positioning and high-precision three-dimensional detection of surface defects of large-aperture curved optical elements by carrying two defect detection modules on a mobile platform.

The invention discloses a device and method for intelligently sorting waste photovoltaic modules and recovering silicon wafers, the device comprises a box taking device, a frame dismantling mechanism, a sorting device, a hot knife device, a tunnel kiln, a screening device, a silver extracting machine and a master control unit, and the master control unit is provided with ResNet-18; the sorting device comprises an annular infrared light source, an area-array camera, a telecentric lens, a pneumatic push rod and a flow guide pipeline, wherein the pneumatic push rod and the flow guide pipeline are arranged on the two sides of the conveying belt respectively. The hot knife device comprises an upper driving roller, a lower driving roller, a vacuum chuck and a double-layer electric heating knife head, the conveying belt penetrates through a gap between the two driving rollers and is connected with the conveying belt at the tail end of the sorting device, and an air cooling fan and a copper solder strip absorbing device which are opposite in position are arranged behind the driving rollers; the tunnel kiln is connected with the screening device through a conveying belt, and discharging ports of the screening device and the hot knife device are connected with the silver extracting machine through conveying belts. Intelligent sorting of the waste photovoltaic modules is achieved, and high-value recovery and conversion of effective components of the waste photovoltaic modules are promoted.

The invention relates to the technical field of optical lenses, and discloses a high-magnification achromatic telecentric lens and an optical system thereof. The optical system comprises a first lens G1 with positive focal power, a second lens G2 with negative focal power, a third lens G3 with positive focal power, a fourth lens G4 with negative focal power, a fifth lens G5 with positive focal power, a sixth lens G6 with negative focal power, a seventh lens G7 with positive focal power and a diaphragm T which are sequentially arranged from an object side to an image side, the system comprises a first lens G8 with negative focal power, an eighth lens G8 with negative focal power, a ninth lens G9 with negative focal power, a tenth lens G10 with positive focal power and an eleventh lens G11 with positive focal power. According to the optical system of the double-telecentric structure, the amplification factor can reach four times or above, the numerical aperture NA can reach 0.16, and the resolution of the microscopic level of 2 micrometers can be achieved; and the maximum imaging surface can reach phi 44 mm.

A device and method used to inspect wellbores, cased or uncased using cameras. Improvements in downhole optical imaging are provided using telecentric lens, prisms and mirrors, or structured lighting. Stereoscopic arrangements and ultrasound sensor may provide 3D or contour information. The images are stored on the tool and analyzed later. The present tool overcomes the deficiencies currently experience by downhole camera operators, such as poor scale and perspective.

This invention discloses a coaxial telecentric polarization hyperspectral imaging device and a biological tissue detection system. The device includes: a light source emitting unpolarized light; a circular polarization generator converting the unpolarized light emitted by the light source into circularly polarized light; the circularly polarized light being coupled into a coaxial telecentric lens via a coaxial optical interface; the coaxial telecentric lens reflecting the circularly polarized light, which then illuminates the target object plane; the signal reflected from the target object re-enters the coaxial telecentric lens and is transmitted to a polarization analyzer module via a beam splitter. The polarization analyzer module includes a first waveplate and a first linear polarizer. The first waveplate receives the signal transmitted from the beam splitter and transmits the signal to the first linear polarizer. The first linear polarizer sends the output light to a hyperspectral camera, and the hyperspectral camera sends the output image to a computer for image analysis.

The machine vision detection method comprises an image acquisition unit, a light source unit and an image processing unit, the image acquisition unit comprises a color high-resolution industrial camera and a telecentric lens, and the working distance between the telecentric lens and an object to be detected is set as a specific value; the image acquisition unit comprises a first image acquisition unit and a second image acquisition unit; the light source unit comprises a first light source subunit and a second light source subunit, and the first light source subunit is used for detecting oil stains on ink; the first light source subunit adopts an annular light source, and after the first image acquisition unit and the second image acquisition unit respectively acquire two groups of images of the first light source subunit and the second light source subunit, the subsequent processing flow is executed; and a potential defect area is preliminarily identified and positioned.

The utility model discloses a visual PIN needle detection equipment, including test board, the fixture seat of setting on test board and the CCD subassembly of setting on the fixture seat top, the CCD subassembly includes the coaxial light source, telecentric lens and CCD camera who sets gradually in vertical direction away from fixture seat, and CCD camera, telecentric lens and coaxial light source are on the same axis, and the light shield of setting the back and two side masks of test board is provided with on test board, and the connecting interface is provided with on test board, and the fixture seat includes the base and the positioning fixture of detachable setting on the base, and the positioning fixture is used for positioning installation detected component, and the support plate for supporting base is provided with on test board, and the sensor is provided with on the both sides of positioning fixture of support plate. The utility model discloses reasonable in structure design, and through the visual configuration of CCD camera + telecentric lens + coaxial light source, can realize to PIN needle and carry out detection, and thoroughly solved the problem that PIN needle is easy to wear in other detection mode among existing.

The invention provides a coaxial telecentric imaging tinplate can defect identification method and system, and relates to the technical field of defect identification, the system is composed of a coaxial telecentric camera assembly, a polarization multispectral light source assembly and an image processing and control unit, and can body images with constant magnification are obtained through a telecentric lens and coaxial illumination; a switchable cross-polarization visible light and near-infrared light source is used for synchronously collecting multi-modal images, and separation and difference are carried out on different polarization and wave band images to obtain a specular reflection component image, a diffuse reflection component image and a multi-spectral difference image. The image is divided into a character area, a pattern area and a bottom color area according to the format of the can body, comprehensive judgment is conducted through character comparison, a lightweight neural network and defect area connectivity analysis, automatic recognition of defects such as scratches, through printing and smudginess is achieved, and the accuracy and stability of appearance detection of the tin can on a high-speed production line can be improved.

Embodiments of the present application provide a high-magnification coaxial telecentric lens and a camera module. The high-magnification coaxial telecentric lens comprises, in order from the object side to the image side, a first lens group, a light splitting prism, a diaphragm, a second lens group and a third lens group. The first lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The second lens group comprises a sixth lens and a seventh lens. The third lens group comprises an eighth lens and a ninth lens. The light splitting prism is provided with a coaxial light source on one side. The first lens, the third lens, the fifth lens, the sixth lens and the ninth lens all have positive refractive powers. The second lens, the fourth lens, the seventh lens and the eighth lens all have negative refractive powers. The first lens group comprises a first cemented lens. The focal length f J01 of the first cemented lens and the focal length f1 of the first lens group satisfy the relationship: 45 < f J01 / f1 < 55. The high-magnification coaxial telecentric lens achieves the purposes of high magnification, large numerical aperture and high imaging quality.

The invention discloses a double liquid telecentric lens, which belongs to the technical field of optical design and is sequentially provided with an optical amplification group, an aperture diaphragm, a liquid lens and an imaging group along an optical path. Wherein the optical amplification group comprises three lenses, the first lens is a biconvex lens, the second lens is a biconvex lens, and the third lens is a biconcave lens in the direction of an optical path; the liquid lens comprises protective glass, optical liquid is packaged in the protective glass, and a magnetic field generator for adjusting the curvature of the liquid lens is arranged on the protective glass; the imaging group comprises three lenses, along the optical path direction, the fifth lens is a convex-concave lens, the sixth lens is a biconcave lens, and the seventh lens is a concave-convex lens. On the premise of keeping the magnification and resolution of the lens unchanged, the high-low fall detection accuracy and speed can be effectively improved, so that the high-low fall detection method plays a greater role in various precision detection fields.