56 results about "Information optics" patented technology

The invention relates to an image-formation optical system that satisfies demands toward high performance and compactness at the same time, and an imaging system incorporating the same. The image-formation optical system comprises, in order from its object side, an aperture stop S, a first positive meniscus lens L1 convex on its object side, a second positive lens L2 having an aspheric surface and a third negative lens L3 having an aspheric surface, and satisfies the following condition.

0.95<Σd/f<1.25  (1)

Here Σd is the distance on an optical axis of the image-formation optical system from the object side-surface of the first positive meniscus lens to the image plane side-surface of the third negative lens, and f is the focal length of the image-formation optical system.

An apparatus for displaying images represented by electronic image information, that includes a light source and a reflective light modulator for optically modulating, with the image information, light from the light source to obtain a diffraction pattern that depends on the image information. An optical system is provided for converting the diffraction pattern into an image, and projection optics are provided for projecting the image obtained with the optical system. The optical system includes an array of schlieren bars and a focusing reflector.

An optical storage apparatus, using the near field optical effect, performs tracking along a track of a recording medium to reproduce information recorded on the recording medium without error. The optical storage apparatus includes a first probe to read information recorded on the recording medium and at least two to judge if the track direction of the recording medium is in accordance with the information scanning direction of the first probe. The apparatus also includes a probe actuator to adjust the tracking direction of the first and second probes using a tracking control signal, and a number of sensors to sense the intensity of radiation probed by the first and second probes and to generate tracking signals corresponding to the sensed radiation. The apparatus also includes a controller to generate a tracking control signal using the tracking signals, and to provide the tracking control signal to the probe actuator.

A Bessel-Gaussian beam mask plate based on the Mittag-Leffler function uses the information optics principle and combines the Mittag-Leffler modulation function, the Bessel-Gaussian beam and the plane wave complex amplitude to obtain the interference light intensity graph to realize the interference recording process of the holographic principle. The interference light intensity graph is the mask plate designed for the invention. The invention has the beneficial effects that the invention provides the Bessel-Gaussian beam mask plate based on the Mittag-Leffler function, which can produce the pattern distribution of any number of optical flaps and has important application value in the fields of multi-particle capturing and the like.

The invention belongs to the field of information optics and relates to a method for adjusting the self-collimation of an interference optical path in a holographic grating lithography system to solvethe poor parallelism of exposure beams when a parallel equidistant stripe holographic grating is fabricated. A volume Bragg grating is placed behind a collimating lens. The incident angle of the exposure beam emitted to the volume Bragg grating is equal to the Bragg angle of the volume Bragg grating. A photoelectric detector is placed on an -1 grade transmission diffraction optical path after theexposure beam is emitted to the volume Bragg grating. A pinhole filter is moved forwards and backwards along an optical axis to observe the readings of the photoelectric detector in real time. When the photoelectric detector has a maximum reading, the pinhole filter is fixed and the distance between a first pinhole filter and a first collimating lens is kept constant. The method for adjusting theself-collimating optical path detects the parallelism of self-collimated light by using the volume Bragg grating, substitutes for a traditional Moire fringe adjustment method, is easy to operate andhas a good practical value.

The present invention is to provide an optical access network in which a remote unit receives an optical burst signal. A central unit (OLT) transmits a DC-balanced optical continuous signal including packets having identification information for identifying each remote unit (ONU) to an optical switching module (OSM). The optical switching module (OSM) receives the DC-balanced optical continuous signal from the central unit (OLT), optically switches the packets based on the identification information, and transmits a DC-balanced optical burst signal including the packets to the remote unit (ONU). The remote unit (ONU) receives the DC-balanced optical burst signal and acquires the packets transmitted to the remote unit (ONU).

Provided is a three dimensional information optics cryptosystem and a method. The three dimensional information optics cryptosystem comprises a set of encryption device and a set of deciphering device. Firstly, a structured light projection coded system is used for encoding the three dimensional information of the objects to be encrypted to a two-dimensional optical stripe image. And then, a double random phase encoding system is used for strengthening the security of the two-dimensional optical stripe image. The three dimensional information optics cryptosystem and the method are capable of effectively achieving the three dimensional information encryption of the objects and enlarging the size range of the encrypted objects.

Disclosed is a photonic orbital angular momentum spiral spectrum measurement system based on Fourier transform. The photonic orbital angular momentum spiral spectrum measurement system based on the Fourier transform relates to the technical field of information optics, and aims at solving the problem that existing spiral spectrum measurement methods are high in complexity and cost. According to the system, a light beam is divided into two lights by a first unpolarized beam splitter, one is transmission light, the other is reflected light, each light path is provided with a Dove prism, the transmission light and the reflected light are reflected by a total reflection mirror to reach a second unpolarized beam splitter, and phases of the transmission light and the reflected light are the samein the second unpolarized beam splitter; two interference lights output by the second unpolarized beam splitter are received by receiving end faces of two photodetectors respectively, and two intensity signals output by the photodetectors are transmitted to a synchronous signal processing system; an orbital angular momentum spiral spectrum is calculated by the synchronous signal processing systemaccording to the synchronously collected intensity signals. The system is applicable to spiral spectrum measurement of echo signals after target detection is performed by adopting the orbital angularmomentum light beam.

The invention provides a weak light speckle imaging recovery method based on a deep convolutional generative adversarial network. The method comprises the following steps: S1, obtaining a speckle PSF of a point light source; S2, obtaining speckles I of an unknown object; S3, performing image gray-scale adaptive nonlinear normalization on the speckle I of the unknown object and the speckle PSF of the point light source to obtain an image; S4, performing deconvolution operation on the normalized speckle of the unknown object according to the most approximate noise-to-signal ratio of a scatterer imaging system and the normalized speckle of the point light source to obtain a restored image Otem of the unknown object; and S5, inputting the unknown object recovery image Otem into a pre-trained deep convolutional generative adversarial network model to obtain a final unknown object reconstruction image O. A complete closed-loop speckle recovery imaging method can be constructed from information optics, adaptive optimization and deep learning, the ability of understanding convolution speckle imaging is enhanced, and generalization of deep learning in speckle imaging recovery is greatly improved.

The invention discloses a method for detecting defects of a die-cut product, which comprises the following steps: obtaining original image information of a die-cutting product by using an optical work station, wherein the optical work station comprises an area-array camera, a telecentric lens and a light source unit which are arranged towards the die-cutting product, and the light source unit comprises a coaxial light source and an annular light source which are mutually switched; performing coarse positioning on the original image information, and performing gray processing to obtain a product area; precisely positioning and correcting the product area, and obtaining the precise product area; carrying out region segmentation on the precise product are according to a gray value to obtain sub-areas; and performing defect feature extraction on the sub-areas, performing defect marking on original image information, and counting the number of defects. According to the invention, the defect features in the obtained image information can be obvious, so that the detection stability is improved. In addition, the area where specific flaws need to be analyzed can be reduced, so that the detection efficiency is improved.

The invention belongs to the technical field of information optics, and relates to a holographic interference photoetching system. In order to solve the problem that the interference fringe drift holographic grating contrast ratio decreases, a first high-speed photoelectric detector is utilized to acquire a moire fringe light intensity signal on the surface of a reference grating, and transmit thelight intensity signal to a single chip computer and a PID controller at the same time; a second high-speed photoelectric detector monitors a light intensity signal of a laser through a light beam sampling grating, the light intensity signal is transmitted to the single chip computer, and a signal output end of the PID controller transmits to a frequency modulation input end of a first ultrasonicgenerator; and when the PID controller judges that the light intensity signal detected in real time by the first high-speed photoelectric detector changes, the PID controller outputs a feedback signal to the first ultrasonic generator, the frequency of the first ultrasonic generator changes correspondingly, the phase of the -1 level diffraction light of a first acoustic optical modulator changes,accordingly the phase of the moire fringe is locked, and locking of the interference fringe phase is achieved.

The invention relates to the technical field of image processing, in particular to an image-based distortion removal method, which comprises the following steps of: S1, acquiring a distorted image, and performing image feature extraction on the distorted image to obtain image feature information of the distorted image; s2, optical center calculation: firstly, obtaining a good distorted image by using a straight line cutting equal method, enabling image distortion to be approximately symmetrical about an image geometric center point, accurately obtaining a center coordinate of a dot on the edge of the distorted image by using an image processing technology, and taking a centroid coordinate in a dot region as the center coordinate of the dot; s3, solving an initial value of a distortion coefficient; s4, optimizing and solving a distortion coefficient; and S5, distorted graph reconstruction: in order to obtain a good corrected image, gray reconstruction, namely gray interpolation, must be carried out on the corrected image, the method is simple, convenient and practical and does not depend on internal parameters of a camera lens and a complex measuring device, and the corrected root-mean-square error and the gray reconstruction root-mean-square error both reach the sub-pixel level after correction.

The invention discloses an X-ray optical framing imaging system that comprises a super-continuum spectrum generation module, a super-continuum spectrum broadening module, a probe light action module and an optical framing recording module, wherein the super-continuum spectrum generation module can convert short-pulse laser into super-continuum spectrum probe light; the super-continuum spectrum broadening module can convert the super-continuum spectrum probe light into chirped pulse probe light; the probe light action module can enable chirped pulse probe light to carry space-time evolution process information of X-rays generated by interaction of targeting laser and a target material, and the optical framing recording module can spatially divide one beam of chirped pulse probe light into aplurality of beams and record the beams of chirped pulse probe light as a plurality of two-dimensional images with time intervals. By adopting the technical scheme, the invention can be used for measuring the X-ray space-time evolution process under the conditions of an extremely small space and an extremely short time scale, and serves the research of a high-energy density related physical process.

A deterioration of reproduction light is occurred by a laser drive current on which a high-frequency current is superimposed. The present invention, for example, is an optical information reproducing apparatus which irradiates a laser beam to an optical disc 1 and reads an information, the optical information reproducing apparatus includes a semiconductor laser 6 which generates the laser beam, a laser drive unit 7 which supplies a drive current on which a high-frequency current are superimposed to the semiconductor laser 6, a spindle motor 2 which drives the optical disc 1 and a control unit 5 which controls the laser drive unit 7 and the spindle motor 2, and the control unit 5 determines a parameter of the high-frequency current based on magnitude of a current on which the high-frequency current is to be superimposed.

The ability to communicate with a specific subject at a prescribed location who lacks any communications equipment opens up many intriguing possibilities. Communications across noisy rooms, hail and warn applications, and localized communications directed at only the intended recipient are a few possibilities. We disclose and show localized acoustic communications, which we call photoacoustic communications, with a listener at long standoff distances using a modulated laser transmitted toward the receiver's ear. The optically encoded information is converted into acoustic messages via the photoacoustic effect. The photoacoustic conversion of the optical information into an audible signal occurs via the absorption of the light by ambient water vapor in the near area of the receiver's ear followed by airborne acoustic transmission to the ear. The recipient requires no external communications equipment to receive audible messages.

Examples relate to an optical imaging system, and to a corresponding apparatus, method and computer program for an optical imaging system. The optical imaging system comprises one or more information sources for providing information about a current orientation of the optical imaging system towards at least a part of an object of interest. The optical imaging system comprises one or more output modules for providing guidance information for a user of the optical imaging system. The optical imaging system comprises a processing module configured to determine information on a desired orientation of the optical imaging system towards at least a part of the object of interest. The processing module is configured to control the one or more output modules to provide the guidance information for the user of the optical imaging system based on a mismatch between the desired orientation of the optical imaging system towards at least the part of the object of interest and the current orientation of the optical imaging system towards at least the part of the object of interest.

The invention relates to a system and a method for online detection of fusion depth of a laser welding head. The system comprises a control terminal, an optical detector, a laser controller, a platform controller and a control arithmetic unit, the control terminal is connected with the platform controller and the laser controller and transmits information, and the platform controller and the laser controller are connected with the optical controller and transmits information. The optical detector is connected with the control arithmetic unit and transmits information, a data processor is connected with the control terminal and transmits information, the laser welding head is moved to a working coordinate, an initial focus coordinate of a welding position is searched from top to bottom by taking a light emitting surface of a laser focusing mirror in a Z-axis direction as a reference, and an initial focus value is Z'; welding is carried out at the welding focus coordinates according to preset parameters, the optical detector is used for collecting the current coordinate value of the welding point on line in the welding process, and the difference between the focus value Z'and the current coordinate value fed back by the optical detector is the current fusion depth value. According to the system, the technological parameters are automatically adjusted, the production efficiency is improved, the yield is increased, and offline detection is reduced.