56results about How to "Large imaging field of view" patented technology

The invention discloses fundus imaging equipment for clinical diagnosis. The fundus imaging equipment for the clinical diagnosis consists of a light source component, a two-dimensional scanning component, a relay lens component, a detector component and a field-of-view target component. According to the fundus imaging equipment for the clinical diagnosis, an observation direction of a patient is fixed by utilizing the field-of-view target component, a retina of a human eye is scanned by using the two-dimensional scanning component, the detector component and an optical amplifier of the detector component optically enlarge a signal reflected by the retina to enhance the signal-to-noise ratio of an image, and a high-resolution image of the retina is acquired through the detection of a confocal signal; according to the fundus imaging equipment for the clinical diagnosis, the influence of field curvature and aberration in an imaging view field is reduced by the special design of a wide-field lens of the relay lens component, and the wide-field imaging of 30 to 60 degrees is realized by adjusting an eyepiece; high-resolution fundus imaging equipment which is compact is design and is applicable to the clinical diagnosis is fulfilled by the schemes of light source fiber input and optical signal fiber output, so that the imaging quality of the traditional fundus photography system is greatly improved, the imaging view field is greatly increased, and the clinical operability of equipment is strengthened; and the fundus imaging equipment for the clinical diagnosis particularly can acquire high-resolution images of retinas of human eyes under the condition that the retinas reflect weak signal light, and is used for the clinical diagnosis of fundus diseases.

The invention discloses a four-beam laser three-dimensional imaging optical system based on a coaxial three-mirror-anastigmat afocal telescope. The four-beam laser three-dimensional imaging optical system is characterized in that: four paths of laser are scattered through a target surface, enter a novel coaxial three-mirror-anastigmat afocal telescope receiving system via four off-axis viewing fields respectively, are reflected through viewing field reflection mirrors, and adopt color separation filters for separating wave bands; and a laser receiving channel can achieve signal acquisition of laser echoes, and an area array imaging channel can achieve shooting of a laser footprint two-dimensional space target, thereby achieving multi-beam laser three-dimensional imaging. The four-beam laser three-dimensional imaging optical system solves the difficulty that multi-beam laser reflection loops share one receiving telescope in the existing laser active detection technology, the large viewing field coaxial three-mirror-anastigmat afocal telescope is adopted, the laser receiving channel and the area array imaging channel are combined by utilizing the off-axis viewing fields, and at least four beams of laser beam echoes can be measured on the layout.

The invention relates to a high precision visual guidance laser tracking method which is realized by a laser tracking device. The laser tracking device consists of a binocular vision measuring system, a rotating double prism system and a laser emitter. The binocular vision measuring system is composed of a first camera, a second camera and a tripod for fixing the position. The rotating double prism system comprises a first rotating prism, a second rotating prism, a supporting structure and a driving device. The laser emitter is used to emit a laser beam. The method of the invention fully combines the advantage that the binocular vision measuring system can carry out three-dimensional measurement in a wide range and the characteristic that the rotating double prism system can realize high precision tracking, and ensures that the laser beam is guided by the binocular vision measurement information quickly and accurately to track a dynamic or static 3D target. In addition, the method can be extended to other areas such as laser vibration measurement, laser welding, laser cutting, laser engraving, laser drilling and surface treatment.

The invention discloses a terahertz band imaging objective lens with a high relative aperture and a large field of view, and belongs to the technical field of optical lens imaging. The object of the invention is to provide a terahertz band imaging objective lens with a high relative aperture and a large field of view, to realize the high relative aperture and large imaging field of view. The terahertz band imaging objective lens comprises a terahertz filter, a first lens, a diaphragm and a second lens. The first lens and the second lens are both convex lenses and both have positive focal power. The first lens and the second lens are both made of plastics having an absorption coefficient of less than 0.5 cm-1 in a less than 0.5THz band and a refractive index 1.3 to 2. Both the first lens and the second lens have high-order aspheric surfaces as the front surfaces, the image quality of the whole field of view is well corrected, and the high relative aperture and large imaging field of view are realized. The invention is applicable to an objective lens for terahertz imaging.

The invention discloses a super-resolution three-dimensional shape measurement method based on optical tweezers dielectric microspheres. The dielectric microspheres are taken as a core, an optical tweezers principle is adopted for controlling the dielectric microspheres in an array mode, a three-dimensional space position of the dielectric microspheres is flexibly controlled, and an optimal imaging effect is obtained. Meanwhile, DMD projection sinusoidal grating stripes are used for encoding a dielectric microsphere imaging space, light field distribution characteristics of the dielectric microsphere imaging space are utilized, and a dielectric microspheres coded image modulated by a to-be-measured structure is resolved, so that transverse graph correction and longitudinal height reconstruction are achieved. According to the method, three-dimensional shape measurement of micro-nano devices with the characteristic dimension of less than 100 nm can be realized in a far-field region through a face imaging mode, and meanwhile, the method has the advantages of high flexibility, high resolution, parallelism, fast measurement and the like.

The invention discloses a tomographic imaging method based on an aplanatic super-structured lens, namely a chromatographic imaging technology utilizing wavelength coding based on a super-structured aplanatic lens. A light source probe (1), the aplanatic super-structured lens (2), a linear polarizer (3) and a quarter-wave plate can be taken as auxiliary optical elements to be inserted into an imaging system for directly improving a signal-to-noise ratio; a photoreceptor (5) is arranged on the imaging surface and is used for receiving an image; through relatively continuous irradiation of different wavelengths, the image surface information of wavelength coding is acquired, and then the tomographic image information of an object is obtained through a corresponding algorithm. According to themethod, a design principle of a super-structure surface is adopted, and the control of the color difference and the correction of the spherical aberration are realized by utilizing the phase.

The invention discloses an array reflection type microscopic image acquisition system, which comprises a microscopic camera module array and a receiving end; the microscopic camera module array is located right above a sample table; the microscopic camera module array comprises a plurality of microscopic camera modules which are distributed in an array. Each microscopic camera module comprises a first lens group, a reflective illumination structure, an excitation light source, a second lens group and an image sensor; the first lens group and the second lens group are symmetrically arranged, the image sensor is electrically connected with the receiving end, the excitation light source is located on one side of the reflective illumination structure, and a light source emitted by the excitation light source irradiates the reflective illumination structure. According to the invention, a plurality of areas of a sample can be simultaneously collected, the detection speed is improved, and thesystem is suitable for detecting opaque large-area samples such as silicon wafers, semiconductor microscopes, biological chips, thick biological samples and the like.

The invention belongs to the technical field of fluorescence microscopic imaging, and relates to a lensless fluorescence microscopic imaging device and an image reconstruction method thereof. The device comprises a monochromatic excitation light source, a movable scattering sheet, a fluorescent sample layer, a high-performance optical filter and an image sensor, wherein the movable scattering sheet is arranged below the monochromatic excitation light source, the fluorescence sample layer is arranged on the lower side of the movable scattering sheet, the movable scattering sheet is parallel tothe fluorescence sample layer, the fluorescence sample layer is used for placing a fluorescence sample to be detected, and the high-performance optical filter is arranged on the lower side of the fluorescence sample layer. The high-performance optical filter is matched with the monochromatic excitation light source and a fluorescent sample of the fluorescent sample layer, and the image sensor is arranged on the lower side of the high-performance optical filter; the lensless fluorescence microscopic imaging device is simple in light path, short in imaging light path, simple and convenient in system operation, large in imaging view field and low in equipment cost; the reconstruction algorithm of the fluorescence sample image is used for processing the fluorescence sample image, and the processed image is high in resolution and good in image quality.

The invention discloses a microscopic imaging method based on a phase encoding single lens. The method only adopts one single lens with a phase encoding function for imaging, combines with a subsequent processing algorithm, can realize microscopic imaging resolution capability equivalent to that of an existing precision commercial microscope, and is suitable for portable biological tissue and celldetection under field conditions. Firstly, an imaging system adopts a phase encoding single lens with two aspheric surfaces to image a biological sample, and an image sensor is located at the conjugate position of the biological sample under G light illumination and used for collecting images; and then, the acquired images are processed by adopting an algorithm: respectively executing an automatic focusing algorithm on the acquired images in R/B channels, and reconstructing and recovering the focusing images of the R/B channels; performing high-resolution image reconstruction on the quasi-focus images of the R, G and B channels by adopting a trained kernel function of a generative adversarial neural network (GAN); and finally, performing image matching and color fusion on the reconstructed R/G/B images.

The invention discloses an opto-acoustic microimaging system. The opto-acoustic microimaging system comprises an exciting light generator, an exciting light path, a detection light generator, a detection light path, a coupling sensor, a light beam decomposition light path and a signal acquisition module. The coupling sensor comprises a metal film, a prism with a convex structure, and a liquid medium. Exciting light acts on a to-be-detected object to generate and return opto-acoustic waves, and accordingly, the refractive index of the liquid medium changes along with time. Detection light comprises components S and P. The prism acts on the metal film to trigger surface plasma resonance, absorption of the component P is influenced by modulation of refractive index changes of the liquid medium, and the detection light is refracted by the prism after the strength of the component P is changed. The detection light is decomposed into the component S and the component P, and the time-dependent opto-acoustic signals are generated according to light intensity difference signals to achieve imaging. Compared with the prior art, the opto-acoustic microimaging system has the advantages that thevisual angle for signal detection is widened by the prism with the concave structure, the opto-acoustic signals away from the optical axis can be received, the field of view for imaging is improved,and acquiring and imaging of the opto-acoustic signals in a large field of view are realized.

The invention discloses a femtosecond laser system image focusing method, and belongs to the technical field of femtosecond laser system direct writing processing. The method comprises the steps: finding a laser spot focusing position by means of a mode that laser scratches ink marks on the surface of a substrate, fixing three adjusting hardware, namely a CCD, a processing objective lens and a piezoelectric platform, and taking the position of an object as a unique adjusting variable; determining and fixing a corresponding position of an object in the focusing light path, and indirectly reflecting a laser focusing state by imaging state definition. If the CCDs are located at the same position, a clear substrate surface can be observed, the clear stripe imaging can also be observed, and itis indicated that focusing is accurate. In subsequent processing, in order to compensate the height difference between different substrates, only the z-direction position of the processing objective lens needs to be finely adjusted to enable stripes to be clear. According to the focusing method, an original light path structure does not need to be changed, temporary building and application are quite easy to achieve, operation steps are relatively simple, requirements for experiment instruments and experiment environments are not high, and implementation is easy.

The invention relates to a single exposure phase recovery imaging device comprising an LD light source, a hemispherical shell, a small hole, a sample, a two-dimensional displacement platform, a two-dimensional photoelectric detector, a computer and data acquisition and processing software; the imaging method comprises the following steps: moving a sample through the two-dimensional displacement platform, and calibrating an illumination light array to obtain complex amplitude distribution of each illumination light beam; and recording a diffraction pattern containing 30 sub-diffraction spots byusing a two-dimensional photoelectric detector, and recovering the complex amplitude distribution of the sample. The device is simple in structure, low in manufacturing cost and short in data acquisition time, and the phase recovery algorithm has the characteristics of high convergence speed, high imaging measurement precision and the like.

The invention provides an infrared thermal imaging optical system. The system sequentially comprises a meniscus negative power lens L1, a biconvex positive power lens L2, a diaphragm S, a biconcave negative power lens L3 and a biconvex positive power lens L4 from an object plane to an image plane along an optical axis. The reciprocal 1/gamma of the angular magnification of the meniscus negative-power lens L1 to the off-axis chief light meets the condition that 1/gamma is larger than or equal to 1.5 and smaller than or equal to 2.4. The invention further provides application of the infrared thermal imaging optical system in the medical field. The infrared thermal imaging optical system realizes optical system design with large relative aperture, large field of view and high illumination uniformity, has high spatial resolution imaging capability, realizes the capabilities of low noise equivalent temperature difference and large imaging field of view, can meet the temperature measurement requirement of infrared thermal imaging equipment for a high-performance infrared optical system, and facilitates wide application and popularization in the medical technology.

The invention discloses a Mirau-type super-resolution interference microscope objective. The sub-nanometer axial resolution is achieved by employing an interference microscope objective, a microspherelens is employed to break through the diffraction limit to achieve two-dimensional lateral super-resolution. A super-resolution interference microscope objective through fusion of the interference microscope objective and the microsphere lens is provided, the microsphere lens is added between the interference microscope objective and a sample to be tested to optimize and design parameters of a reference panel, a beam splitter panel and the microscope objective, obtain clear 3D super-resolution interference fringes and achieve 3D high-resolution imaging. The Mirau-type super-resolution interference microscope objective can achieve horizontal super-resolution by means of a simple optical method to obtain the three-dimensional high-resolution information of the microstructure to be tested with no need for complex marking processing for the samples, can achieve rapid and lossless measurement and has a high practical value.

The invention provides a bright field phase microscopic imaging device and method based on a spiral phase plate. The device comprises: a laser light source; a beam expanding and collimating unit usedfor carrying out beam expanding and collimating on the laser beam and projecting the laser beam onto a sample to generate Gaussian light carrying sample information; a phase modulation unit used for carrying out phase modulation on the Gaussian light according to the imported spiral phase plate hologram and generating vortex light carrying sample information; a detector used for collecting vortexlight and obtaining an imaging intensity graph; and a control terminal used for processing the imaging intensity image to obtain a reconstructed sample phase information image. According to the invention, phase modulation is carried out on the Gaussian beam carrying the sample information, and the collected Gaussian beam is converted into the vortex light, so that the sample phase information canbe obtained by shooting and recording the imaging intensity graph once, the device is simple, the operation is convenient, the imaging speed is high, the imaging field of view is large, the limitationof dark field imaging is eliminated by bright field imaging, the time resolution of phase microscopic imaging is greatly improved, and the imaging steps are simplified.