2079 results about "Optical filter" patented technology

The invention relates to the technical field of image processing, in particular to an image imaging method based on an anti-ambient light interference technology and image acquisition equipment thereof. According to the method, a photoelectric sensor is used for receiving a mixed optical signal reflected by a target, a tunable optical filter is used for extracting a reflected light component containing pulse coding characteristics, and an anti-interference characteristic pattern with a time dimension identifier is generated; based on the time dimension identifier of the anti-interference feature map, identifying an effective reflection region meeting a preset reflection characteristic threshold in the target scene, and marking a transient interference region generated by direct illumination of ambient light; and performing differential operation on the light intensity data of the effective reflection area and the spectral characteristics of the transient interference area, and reconstructing a target intrinsic image shielded by light. According to the invention, the imaging definition and the target identification reliability under severe illumination conditions such as backlight and strong light can be improved.

A light absorber 10 has a transmission spectrum satisfying the following requirements (I), (II), (III), (IV), and (V) at an incident angle of 0°. The light absorber 10 has a haze less than 0.20%. (I) An average transmittance TA0deg(460-600) is 75% or more. (II) A shorter cut-off wavelength λH0deg(s) is in a range of 390 nm to 450 nm. (III) A longer cut-off wavelength λH0deg(L) is in a range of 600 nm to 680 nm. (IV) An average TA0deg(300-380) is 1.2% or less. (V) An average TA0deg(750-1000) is 1.2% or less.

The invention relates to a terahertz-Raman integrated detection system and method. The detection system comprises a fusion mainframe box and an integrated probe arranged at a sample detection end on the fusion mainframe box, a Raman spectrum module, a terahertz spectrum module, a terahertz optical module and a data analysis module are arranged in the fusion mainframe box; the Raman spectrum module is composed of a Raman laser, a Raman light filter, a Raman grating and a Raman detector which are sequentially connected through a light path; the terahertz spectrum module is composed of a terahertz femtosecond laser, a transmitting photoconductive antenna, a receiving photoconductive antenna and a terahertz detector which are sequentially connected through a light path; the data analysis module is in communication connection with the Raman detector and the terahertz detector and is used for synchronously processing data transmitted by the Raman detector and the terahertz detector. Compared with the prior art, the integrated probe synchronously collects two kinds of spectral data and carries out fusion processing on the two kinds of spectral data through the data analysis module, and the device has the remarkable effects that the device integration degree is high, the detection efficiency and accuracy are greatly improved, and the application range is wide.

The invention discloses a laser frequency stabilization system based on Faraday anomalous dispersion atomic filtering, which is used for carrying out frequency stabilization on phase modulation multi-sideband laser, and comprises a frequency doubling laser unit which is configured to comprise a fundamental frequency seed light source, an electro-optical modulator, a fundamental frequency amplifier and a frequency doubling crystal; the light splitting module unit is configured to split the frequency doubling light into a main output light path and a monitoring light path; the atomic optical rotation filter is located on the monitoring light path and is configured to maintain the purity of the frequency-stabilized laser spectrum through purification treatment under the control of the axial magnetic field and the temperature; the frequency stabilization unit is configured to be a frequency stabilization light path and a servo system, and the frequency stabilization light path is used for obtaining laser frequency information and generating an error signal; the servo system is used for controlling the frequency of the fundamental frequency seed light source according to the error signal feedback. According to the laser frequency stabilization system provided by the invention, the spectrum purification and frequency stabilization precision can be improved, so that high-frequency stability locking is realized.

The invention relates to a three-waveband medium-long wave infrared optical filter and a preparation method, the three-waveband medium-long wave infrared optical filter comprises a front film system, a substrate and a back film system, and the substrate is located between the front film system and the back film system; the front film system is formed by alternately overlapping germanium layers and zinc selenide film layers; and the back film system is formed by alternately overlapping germanium layers and zinc selenide film layers. According to the invention, the light energy of three wave bands of 3780-4000 nm, 4500-4900 nm and 7850-9500 nm is improved, the luminous flux of other wave bands is well inhibited, the technical problem of infrared filtering windows in some special infrared spectrum detection systems is solved, and a new scheme is provided for the application of the infrared spectrum detection systems.

Provided is an inspecting apparatus for semiconductor device including a chamber, a substrate stage within the chamber and configured to load a test wafer, the test wafer including a plurality of wiring layers, a milling device configured to partially remove the test wafer, and a measuring device including a body portion, a light source configured to irradiate an incident light, an objective lens, a lens assembly having a plurality of optical filter and an optical splitter, wherein the lens assembly is configured to introduce the incident light such that the incident light is emitted on the test wafer; and a polarization camera configured to scan the test wafer by receiving reflected light reflected from the test wafer, wherein the measuring device is configured to measure polarization characteristic of the reflected light and uniformity of the test wafer.

Sleep-aiding eyewear that prevents light which inhibits melatonin production from reaching the eye is described. The eyewear that is the object of the present disclosure has improved visibility over other methods of cutting off melatonin-inhibiting wavelengths of light, which enables the user to perform tasks, such as reading and typing, uninhibited. This is achieved in some embodiments using a Bragg grating comprising multiple layers of alternating reflective index material as a surface coating on the lens. This may be combined with lens-tinting, or antireflective coatings, in the eyewear. Furthermore, transition lenses which block melatonin-shifting light when there is a suitable external stimulus, such as blue light from a light emitting diode, are described. The presently described filters are also useful for electronic displays and functional light-transmitting materials.

The invention relates to a secondary harmonic characterization system based on spatial light regulation and control. The secondary harmonic characterization system comprises an incident light path unit, a detection light path unit and a sample table, the incident light path unit sequentially comprises a laser, a polarizer, a half-wave plate, a light modulator, a long-pass optical filter and an incident objective lens in the light beam incident direction; a wafer is carried on the sample table; the detection light path unit sequentially comprises an adjustable detection objective lens, a light path adjuster, a polarization analyzer, a short-pass optical filter and a detector in the light beam reflection direction; according to the SHG signal representation detected by the detector, all control parameters of the light modulator, the adjustable detection objective lens, the light path adjuster and the sample table are regulated and controlled, and the SHG signal receiving efficiency of the detector is improved. According to the invention, it is ensured that the detector efficiently receives the SHG signal, and the SHG characterization precision is improved.

Disclosed is a detection device for laser spot welding micro-weld spot quality based on laser ultrasound, comprising: a nanosecond pulsed laser configured to emit a laser; a half-wave plate configured to generate a phase difference of the laser; a scanning galvanometer configured to focus the laser as a point source and excite an ultrasonic wave on a surface of a sample; a multi-axis displacement platform configured to place and / or move the sample; a laser Doppler vibrometer configured to emit a probe light; an image sensor configured to acquire image data of the sample in a plurality of attitudes; an optical filter configured to receive the probe light to adjust an intensity of the probe light; and a processor configured to be in communication connection with the image sensor, the optical filter, the nanosecond pulsed laser, the scanning galvanometer, the multi-axis displacement platform, and the laser Doppler vibrometer.

The invention discloses a laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spots and speckle signals under the condition of not depending on an expensive refrigerating system by optimizing an optical structure and a control strategy. The device comprises an imaging lens, a lens electric control module, a liquid crystal tunable optical filter module, an ND filter wheel, a driving mechanism of the ND filter wheel, a two-dimensional image sensor, a main control unit, a three-axis acceleration sensor, a PC host and a tested screen. A noise calibration piece preset in an ND filter wheel is used for collecting noise data in real time before each time of measurement, and noise deduction is carried out before the filter is switched, so that the timeliness and accuracy of data correction are improved; meanwhile, the integrated three-axis acceleration sensor is used for monitoring vibration, and when vibration exceeding a preset threshold value is detected, it can be judged that currently collected data is invalid, and re-collection is automatically triggered. The device is compact in structure, low in cost and suitable for the fields of laser display, projection calibration, high-brightness light source detection and the like.

The invention relates to the technical field of optical imaging, in particular to imaging equipment and an imaging method based on multi-dimensional optical perception, the equipment comprises a lens, a rotary dimming mechanism, a fast reflecting mirror, a broadband visible light high-speed camera and a controller, and a turntable of the rotary dimming mechanism is provided with an optical filter and polaroids with different polarization angles; a target light source enters from the lens, passes through the rotary dimming mechanism and is reflected to the broadband visible light high-speed camera by the fast reflecting mirror; the controller is in communication connection with the rotary dimming mechanism, the fast reflecting mirror and the broadband visible light high-speed camera, the controller cooperatively controls the rotary dimming mechanism, the fast reflecting mirror and the broadband visible light high-speed camera, the inherent space registration error of a multi-aperture system is fundamentally eliminated, and meanwhile, the equipment is compact in overall structure, low in cost and high in practicability. Miniaturization, light weight and low power consumption are realized, and microsecond-level cooperative control of the fast reflecting mirror, the rotary dimming mechanism and the broadband visible light high-speed camera is realized through dual-path FPGA cooperative processing.

A photonic crystal optical filter and a spectrum detection system, the photonic crystal optical filter comprising: a photonic crystal portion comprising a plurality of photonic crystal units, each photonic crystal unit comprising a plurality of through holes arranged in an array, each photonic crystal unit comprising a central region and a peripheral region, the plurality of through holes comprise a first through hole in the central area and a second through hole in the peripheral area; the central area comprises Na * Na first through holes, and Na is a positive integer greater than or equal to 5; the number of the second through holes in each edge of the peripheral area is Na * Nb, wherein Nb is a positive integer greater than or equal to 1; the minimum distance between every two adjacent first through holes is a first distance Da, the minimum distance between every two adjacent second through holes is a second distance Db, the minimum distance between the first through holes and the second through holes is a third distance Dg, Na * Da + Nb * Db + Dg is smaller than or equal to 10 micrometers, and the spectrum detection system has the advantages of being high in detection precision, small in structural size, stable in structure and the like.

An image sensor with one or more imaging sensor layers and / or one or more color filter layers is provided. Imaging sensor layers sense different combinations of wavelengths of light depending in part on filtered light passing through the color filter layers. The color filter layers, which can be tunable filters, plasmonic color filters or dielectric subwavelength grating filters, allow certain colors of light to pass through to the imaging sensor layers and block others. The image sensor is connected to control circuitry that measures the properties of light received at each imaging sensor layer, reconstructs the color components of each pixel of the imaging sensor layers based on these measurements, and generates full-color image data from the color components. Methods of manufacturing the image sensor are also provided using lithography and securing the layers in a sensor stack using a bonding substrate.

The present disclosure provides a semiconductor structure and a system for manufacturing the semiconductor structure. The system includes a fabrication equipment, configured to perform operations to form a layer on a wafer; an exposure equipment, configured to perform patterning operations to form a pattern of the layer; and an alignment equipment, configured to detect an alignment of two overlay marks at different elevations on the wafer. The alignment equipment includes a stage, configured to support the wafer; an optical device, configured to emit a radiation to excite a photoluminescent material of one of the two overlay marks; an optical filter, configured to receive and filter a radiation emitted from the photoluminescent material; and an optical detector, configured to convert an optical signal filtered by the optical filter to an electrical signal.

The invention relates to the technical field of light quantum metering, in particular to a multifunctional standard single photon source generation and calibration device and a use method, and the device comprises a pumping laser light source, a nonlinear crystal, a signal optical filter, a beam splitter, a temperature control module, an idler frequency optical filter, a control module, a single photon detector group, a beam splitter, a multi-channel coincidence counter, and an optical switch. The pumping laser light source pumps the nonlinear crystal to generate two paths of single photon output of signal light and idler frequency light, the two paths of single photon output are filtered by the filter and then divided into multiple paths by the beam splitter, and standard single photons are directly output or the paths of the signal light or the idler frequency light are controlled by the optical switch to enter the single photon detector group for detection. External input single photons are controlled by the optical switch to enter the single-photon detector group for detection, and a count value of the single-photon detector group is accessed to the multichannel coincidence counter to record data. A pump light stable power system and a multi-path beam splitting coincidence counting system are introduced into a light path, so that standard single photon output with known brightness and g (2) (0) value can be realized.

An image sensor with one or more imaging sensor layers and / or one or more color filter layers is provided. Imaging sensor layers sense different combinations of wavelengths of light depending in part on filtered light passing through the color filter layers. The color filter layers, which can be tunable filters, plasmonic color filters or dielectric subwavelength grating filters, allow certain colors of light to pass through to the imaging sensor layers and block others. The image sensor is connected to control circuitry that measures the properties of light received at each imaging sensor layer, reconstructs the color components of each pixel of the imaging sensor layers based on these measurements, and generates full-color image data from the color components. Methods of manufacturing the image sensor are also provided using lithography and securing the layers in a sensor stack using a bonding substrate.

The invention discloses a few-sample-oriented welding defect identification method and platform, and relates to the technical field of welding defect identification, and the method comprises the following steps: collecting and marking an original welding image, collecting a molten pool gray scale image with an optical filter in real time through a visual system in a welding process, and adjusting and generating various defect images in combination with process parameters; the actual welding defect is used as a label; the welding original image is preprocessed, wherein welding pool area cutting, data enhancement operation and standardized data division are included; performing staged training on a welding defect identification model, extracting spatial features through a backbone network, performing cross fusion on horizontal and vertical features through a multi-dimensional feature fusion module to enhance molten pool positioning, and generating high-order statistical features through a Brownian distance covariance matrix module; the method comprises the following steps: identifying defects in an actual welding process, constructing a prototype welding network space based on a meta-learning strategy, generating class prototype vectors of various defects, realizing classification of query images through similarity measurement, and dynamically adjusting process parameters.

The invention relates to the technical field of optical filters, and provides an infrared ray gradient optical filter and a preparation method thereof, and the preparation method comprises the following steps: providing a substrate; coating the upper surface of the substrate for the first time to form a first reflecting layer; the upper surface of the first reflecting layer is coated for the second time to form a spacer layer, the cross section of the spacer layer is of a wedge-shaped structure, and the thickness of the wedge-shaped structure is linearly increased in the preset direction; and carrying out third coating on the upper surface of the spacing layer to form a second reflecting layer, thereby obtaining the infrared linear gradual change optical filter. The surface, away from the substrate, of the second reflecting layer is used for receiving incident light, and the surface, away from the first reflecting layer, of the substrate is used for emitting transmission light. And the second reflecting layer is formed by alternately laminating first refractive index material film layers and second refractive index material film layers. The infrared ray linear gradual change optical filter can continuously and dynamically adjust the spectral resolution, and the wavelength application range is wide.

The invention relates to a dual-waveband medium-long wave infrared optical filter based on a germanium / zinc sulfide asymmetric film system and a preparation method of the dual-waveband medium-long wave infrared optical filter. The dual-waveband medium-long wave infrared optical filter comprises a front film system, a substrate and a back film system, the front film system and the back film system are formed by alternately overlapping germanium layers and zinc sulfide film layers; the average transmittance of the infrared optical filter in the wave band of 3800 nm to 4800 nm and the wave band of 8000 nm to 10000 nm is not lower than 91%. According to the two-waveband medium-long wave infrared optical filter disclosed by the invention, 3800 to 4800 nm amp is realized; according to the infrared filtering window, the light energy of medium waves and long waves of 8000-10000 nm is improved, the luminous flux of other wavebands is well inhibited, the technical problem of the infrared filtering window in some special infrared spectrum detection systems is solved, and a new scheme is provided for infrared application.

The invention relates to an all-silicon metasurface infrared optical filter based on a bound state in a quasi-continuous domain and a manufacturing method of the all-silicon metasurface infrared optical filter. Belongs to the technical field of micro-nano optics, and particularly relates to the technical field of all-silicon metasurface infrared optical filters. The problem that application of the metasurface optical filter under an infrared broadband light source is limited is solved. The all-silicon metasurface infrared optical filter based on the bound state in the quasi-continuous domain comprises a self-supporting silicon frame, a monocrystalline silicon thin film and a nanometer cavity array. The monocrystalline silicon thin film is attached to the self-supporting silicon frame, and a nano cavity array is etched on the surface of the monocrystalline silicon thin film; one surface of the self-supporting silicon frame attached with the monocrystalline silicon film is a light incident surface, and the other surface is a light emergent surface; incident light is irradiated to the nano cavity array on the monocrystalline silicon film in a normal or a certain incident angle to excite a surface resonance mode and a bound state in a quasi-continuous domain, the surface resonance mode and the bound state in the quasi-continuous domain are subjected to interference coupling under the same resonance frequency to form a space overlapping mode, and the incident light is modulated and emitted from the other face of the self-supporting silicon frame.

A filter array, which is to be used in a photodetection system that generates image data of each of N wavelength bands (where N is an integer greater than or equal to 4), includes optical filters whose light transmittances in each of the N wavelength bands differ from each other. (σ1 / μ1)≥0.1, . . . , and (σN / μN)≥0.1, where μi is a mean value of transmittances, corresponding one-to-one to the optical filters, with respect to light of an i-th wavelength band (where i is an integer greater than or equal to 1 and less than or equal to N) among the N wavelength bands, and where σi is a standard deviation of the transmittances, corresponding one-to-one to the optical filters, with respect to the light of the i-th wavelength band.

The invention belongs to the technical field of visible light detection, and aims to realize accurate detection of multicolor visible light and monolithic integration of a multi-wavelength receiver. The invention provides a fully-integrated multicolor visible light detector based on a sub-wavelength polycrystalline silicon grating, which comprises three detectors capable of selectively detecting blue, green and red signals respectively. The principle is as follows: a one-dimensional sub-wavelength polycrystalline silicon grating in the multicolor detector is embedded in an upper SiO2 layer and a lower shallow trench isolation region to form a dielectric waveguide structure of which the middle is a high-refractive-index medium and the periphery is a low-refractive-index oxide layer. The period and the grating width of the sub-wavelength grating are changed, so that the incident polarized light and the sub-wavelength periodic structure are strongly coupled to cause a guided-mode resonance effect, and the sub-wavelength grating can be applied to a transmission optical filter. The size and the cost of the multicolor visible light communication system can be effectively reduced, and the data transmission rate of the system is greatly improved.

A first pumping source and a second pumping source are combined through a pumping beam combiner and are coupled into an erbium-doped fluoride fiber and a high-reflectivity fiber bragg grating, and the erbium-doped fluoride fiber and a low-reflectivity fiber bragg grating form a laser resonant cavity. The intermediate infrared laser is output through the low-reflectivity fiber bragg grating, the cladding light filter and the optical fiber end cap; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating have the same grating period, the fourth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4F9 / 2 energy level to the 4I9 / 2 energy level, and the fifth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4I11 / 2 energy level to the 4I13 / 2 energy level; by adjusting the power of the first pumping source and the second pumping source, the net gain of laser transitions from the 4F9 / 2 energy level to the 4I9 / 2 energy level and transitions from the 4I11 / 2 energy level to the 4I13 / 2 energy level is regulated and controlled, and switching of laser working wavelengths is achieved.

The utility model discloses a modularized fluorescence analysis and detection device, which relates to the technical field of fluorescence analyzers and particularly comprises a first shell which is a control part, a display screen is arranged at the top of the first shell, a control mainboard is arranged in the first shell, and the modularized fluorescence analysis and detection device further comprises a second shell connected with the first shell; the second shell is a detection part, and a frame body for placing a sample cell is arranged in the second shell; a fluorescence receiving part is arranged at the top in the second shell, an irradiation part is arranged at the bottom in the second shell, the fluorescence receiving part is located above the sample cell, and the irradiation part is located below the sample cell. During use, the first electric actuator can be controlled to move by operating the keys, so that the positions of the fluorescence receiving part and the irradiation part are adjusted, and a proper distance is kept between the optical filter group at the bottom of the fluorescence receiving part and the sample cell; and the light beams emitted by the irradiation part can be driven by controlling the first electric actuator to be completely concentrated on the sample cell.

Systems, methods, and apparatus related to sensor data processing for a vehicle to improve operation when sunlight or other bright light enters a sensor of the vehicle. In one approach, adjustable filtering is configured for a sensor of a vehicle. In one example, an optical filter is positioned on the path of light that reaches an image sensor of a camera. For example, the filtering improves ability to stay in adaptive cruise control when driving into direct sunlight at sunset. The optical filters can have controllable properties such as polarization. In one example, a controller of the vehicle is configured to automatically adjust the properties of the optical filter to improve image quality to improve object recognition. In another example, a camera is configured with composite vision that uses sensors in different radiation spectrums (e.g., visible light, and infrared light). The composite vision can provide enhanced vision capability for an autonomous vehicle that is driving in the direction of the sun.

A composite optical filter may include a substrate, a communal optical filter, one or more first optical filters, and one or more second optical filters. The communal optical filter may be formed on a first surface of the substrate. The one or more first optical filters may be formed on one or more first portions of a second surface of the substrate and may be configured to pass light associated with a first wavelength. The one or more second optical filters may be formed on one or more second portions of the second surface of the substrate and may be configured to pass light associated with a second wavelength.

The invention relates to the technical field of synchrotron radiation experiments, in particular to an XAFS automatic sample changing device integrating light intensity management and an operation method.The XAFS automatic sample changing device integrating light intensity management comprises an optical filter wheel, a sample table and a control assembly, the optical filter wheel and the sample table form an integrated structure used for XAFS experiments, the sample switching process is matched with the incident X-ray light intensity adjusting process, and the XAFS automatic sample changing device integrating light intensity management is achieved. Therefore, light intensity management is realized in an automatic sample changing process; an optical filter wheel capable of automatically switching, a sample table capable of accurately positioning and a temperature monitoring and remote control system cooperating with the sample table are introduced into a synchrotron radiation X-ray optical path, so that the photon flux incident on a sample can be optimized in real time according to the signal state of a detector and the thermal load of an optical filter; the stability, repeatability and safety of an XAFS experiment are remarkably improved while signal saturation and equipment overheating are avoided, so that manual intervention is reduced, the debugging time is shortened, and the operation efficiency of a whole light beam line is improved.

An objective system of a medical scope including an optical filter is disclosed. The optical filter includes a light incident side and a light exit side, a central region around an optical axis, and a peripheral region and is designed as an aperture with a single optical axis for white light and fluorescence light. The optical filter includes a first transmission zone for a transmittance of a first wavelength band and a second transmission zone for a transmittance of a second wavelength band at least partially different from the first wavelength band. At least one of the two transmission zones includes a filter coating. As a result, when both white light and fluorescence light pass the optical filter, a light beam cone of the fluorescence light has a larger diameter than a light beam cone of white light or vice versa.

A lidar system for simultaneously measuring the column concentration of methane and the profile concentration of water vapor in the atmosphere is disclosed. The device includes a laser emission module: a 1645nm monoline seed laser, a 1645nm offline1 seed laser, a 1645nm offline2 seed laser, a 1064nm pump laser, a laser frequency-locking module, an optical parametric oscillator, a frequency doubling module, and emitting optical components; an echo receiving module: an integrating sphere module, an optical receiving telescope assembly, a beam splitter, filter assembly 1, filter assembly 2, photodetector 1, and photodetector 2; and a data acquisition and processing module. This invention utilizes the frequency doubling relationship between the absorption lines of methane and water vapor to simplify the complex structure of a dual-band, multi-wavelength laser. It employs seed-injected optical parametric oscillator technology to obtain a high-frequency stable 1645nm fundamental frequency light, which is then frequency-doubled to obtain an 822nm laser. The profile concentration of water vapor and the column concentration of methane in the atmosphere can be measured using differential absorption lidar (DIAL) and integral path differential absorption (IPDA) technologies, respectively.

An electronic device with less stray light is provided. The electronic device includes a display panel and an optical device. The optical device has a function of partly decreasing the luminance of light emitted from the display panel. For the optical device, a half mirror, a dark filter, or the like in which the transmittance is continuously decreased from the inside toward the outside can be used. With the use of such a component, stray light that is likely to be generated in a peripheral portion of a lens can be suppressed, and the visibility of an image displayed on the display panel can be improved.