2709 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.

An on-chip mid-infrared micro-ring resonant cavity microfluidic spectrometer is integrated on a substrate material and comprises a spot size converter, an optical coupler, a microfluidic module, a micro-ring resonant cavity, a miniature thin-film resistance heater, a sequential control power supply module, an optical filtering system and a photoelectric detector array. Selective filtering is performed on an input optical signal, and the flow and flow velocity of liquid or gas to be detected are controlled by using the microfluidic module, so that selective absorption of spectral components of the liquid or gas to be detected is realized. In addition, the invention also discloses a mid-infrared integrated optical chip micro-fluidic multiphase detection device comprising the spectrometer and a detection method thereof, the device also comprises a pumping and reference light source module and an on-chip mid-infrared frequency comb generation module, a broadband frequency comb is generated as a light source, a photoelectric detector array is used for collecting signals, and the detection precision is improved. The detection and inversion of the type and concentration of multi-component liquid or gas to be detected are realized, and the on-chip, real-time and micro detection of multi-component substances is realized.

The invention discloses a multi-pass optical filter and a preparation method thereof, and the method comprises the steps: selecting a main reference channel, and carrying out the difference frequency modulation excitation through narrow linewidth laser, and obtaining optical transmission coupling data; performing periodic disturbance detection on the observation channel to obtain spectrum drift associated data; modulating deposition power and air pressure according to the spectrum drift associated data to form a crosstalk suppression layer; forming a three-layer dielectric structure with increasing optical thickness and a periodically changing coupling regulation layer on the crosstalk suppression layer; and performing temperature modulation annealing treatment to form an inter-channel steady-state coupling structure, and establishing a spectrum drift compensation parameter. The technical scheme of the invention can systematically characterize the correlation drift of the multi-channel spectral characteristic along with the micro process or service disturbance, accurately quantify the coupling relationship between different passbands, and solve the technical problem that the correlation drift between the passbands cannot be completely captured in the existing discrete measurement mode. The phenomenon of'array misfocus' in a miniature multispectral system is effectively avoided, and the precision and stability of the multi-pass optical filter are improved.

The invention discloses a variable beam divergence angle laser communication terminal and a rapid capturing method thereof, and belongs to the technical field of optical communication equipment. Comprising a main telescope, a fine tracking fast reflecting mirror, a beam splitter, an optical filter, a beam splitter, a beacon receiving lens group, a beacon detector, a signal transmitting lens group, an advanced aiming fast reflecting mirror, a signal receiving lens group, a receiving optical fiber amplifier, a multi-core optical fiber splitter, an optical switch and a transmitting optical fiber amplifier, a signal light emitting light path, a beacon light receiving light path and a signal light receiving light path are formed; the signal light emission light path provides emission light beams through different mode field optical fibers and performs shaping and variable beam divergence angle emission on the emission light by using different paths of an emission mirror group, and the signal light receiving light path is used for completing collection, shaping, coupling and light amplification on input signal light. And the beacon light receiving optical path is used for collecting, shaping and converging the input signal light, and positioning a target light spot by using an image positioning detector. According to the invention, the remote capturing efficiency can be improved.

An optical filter includes: a substrate, an antireflection layer 1 including a dielectric multilayer film laminated on one main surface side of the substrate, and an antireflection layer 2 including a dielectric multilayer film laminated on the other main surface side of the substrate. The substrate includes a near-infrared ray absorbing glass and a resin film, the resin film includes a resin, a UV dye having a maximum absorption wavelength in 350 nm to 410 nm in the resin, and an IR dye having a maximum absorption wavelength in 700 nm to 850 nm in the resin, and the optical filter satisfies all of the characteristics (i-1) to (i-7).

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.

The invention provides an adaptive ultra-wideband space-time digital beam forming method and system based on a multi-term filter. The system comprises an FPGA chip module and an AD / DA conversion module, the FPGA chip module is connected with the AD / DA conversion module and is used for forming a wave beam and sending wave beam data to the AD / DA conversion module, generating an intermediate frequency broadband signal and transmitting the intermediate frequency broadband signal to a subsequent circuit; the AD / DA conversion module is used for inputting the intermediate frequency signal subjected to AD sampling into the FPGA chip module and receiving beam data; a multi-term filter structure is adopted, the signal bandwidth is effectively reduced through the time delay function preposition and multi-phase filter combined technology, the time domain ultra-wideband beam forming function is efficiently achieved, and the time domain ultra-wideband beam forming device can be widely applied to radar wideband digital beam forming, microphone arrays, sonar arrays and other systems.

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.

A periscopic camera module disclosed by the present invention comprises a lens assembly, a motor assembly and an imaging module, the imaging module comprises an optical filter, a photosensitive chip and a circuit board, the periscopic camera module is characterized in that the periscopic camera module further comprises a reflector, the reflector is obliquely arranged behind the lens assembly, and a first preset angle is formed between the reflector and the optical axis of the lens; the imaging module is arranged in the reflecting light path direction of the reflecting mirror, the reflecting mirror comprises a substrate and a reflecting layer on the surface of the substrate, the reflecting layer can be configured to be a film coating medium, the film coating medium is an aluminum film or a silver film, the reflectivity of the film coating medium is larger than 95%, and the reflection bandwidth is the wavelength of 420-680 nm. According to the periscopic camera module provided by the invention, a prism can be replaced by the reflecting mirror, so that the module cost is reduced, and meanwhile, the effect of reducing the thickness of the module is achieved by utilizing the special angle arrangement of the reflecting mirror and the photosensitive chip.

The invention provides a high-frame-frequency optical filter switching mechanism under cold optics, and the mechanism comprises a Dewar box which is composed of a plurality of Dewar walls, the temperature in the Dewar box is lower than-200 DEG C, the vacuum degree in the Dewar box is lower than 10 <-5 > pa, and a first through hole is formed in the surface of at least one Dewar wall in a penetrating manner; the filter wheel is arranged in a low-temperature environment in the Dewar box, the filter wheel is provided with a plurality of optical filters which are arranged in a sector ring shape, the optical filters are configured to realize high-frame-frequency light filtering in the low-temperature environment, and the switching frequency of the optical filters is greater than 100Hz; the servo motor is arranged in a normal-temperature environment outside the Dewar box and is configured to drive the filter wheel to rotate; and the transmission mechanism penetrates through the first through hole, is connected with the servo motor and the filter wheel, and is configured to provide transmission force and reduce heat conduction from the servo motor to the filter wheel at the same time.

The invention discloses a three-dimensional optical filter device capable of realizing light vertical coupling and a preparation method and system thereof, and the device comprises a first straight waveguide which extends along a first direction; the resonant micro-ring waveguide is arranged on one side of the first straight waveguide in the third direction; the axial direction of the resonant micro-ring waveguide is parallel to the second direction; the second direction and the first direction are perpendicular to each other and are both perpendicular to the third direction; a second straight waveguide extending in a third direction; the distance from the circle center of the circular section of the resonant micro-ring waveguide to the first straight waveguide is equal to the distance from the circle center to the second straight waveguide; the distance between the end face of one side, close to the first straight waveguide, of the second straight waveguide and the first straight waveguide is smaller than (R1 + R2) / 3, R1 is the inner ring radius of the resonant micro-ring waveguide, and R2 is the outer ring radius of the resonant micro-ring waveguide. The three-dimensional optical filter provided by the invention is high in integration level, reduces the number of devices in a three-dimensional photoelectric system, and is beneficial to realizing large-scale optical communication.

The invention relates to a topological photonic crystal-based optical filter design method, equipment and medium, and the method comprises the steps: constructing a periodically arranged photonic crystal flat plate, and enabling a super unit to be composed of a topological non-trivial unit and a topological trivial unit, and the topological characteristic and the arrangement mode of the topological non-trivial unit are determined by calculating the two-dimensional bundling phase so as to form a topological defect state. And then, by adjusting the width of the air micropores and the defect spacing, the flatness and the coupling strength of a defect state energy band are optimized, and the stability of the resonant wavelength is ensured. Full-wave electromagnetic simulation is adopted to test transmission spectrums under different incident angles, the angle insensitivity characteristic of resonant wavelength is verified, and key structure parameters are iteratively optimized. Finally, an optical filter with efficient filtering, low energy consumption, high integration level and anti-interference capability is output, and the optical filter is widely applied to the fields of optical communication, optical sensing, high-precision spectral analysis and the like.

The invention provides a non-linear error compensation system and method for a stylus contourgraph sensor, and the system comprises a laser light source, an adjustable diaphragm, a beam splitter prism, a focusing lens and a lever which are sequentially arranged along the transmission direction of a light path. An incident light beam emitted by the laser light source is reflected by the lever to form a reflected light beam; the reflected light beam sequentially passes through the focusing lens and the beam splitter prism and then enters the imaging lens; wherein the lever can deflect in the Z direction; the imaging lens, the narrow-band optical filter and the position sensitive detector are sequentially arranged along the transmission direction of the optical path; the position sensitive detector is used for acquiring the position of the center of the reflection light spot in the Z direction before and after the lever deflects in the Z direction; and the control unit is in signal connection with the position sensitive detector. The position change of the reflected light spot in the Z direction is detected, and the angle change of the lever is calculated, so that nonlinear error measurement and dynamic compensation in the X direction and the Z direction are realized.

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.

Disclosed are a switching mechanism, an assembly mechanism and a rabbit cage apparatus. The switching mechanism applied to being assembled with an assembly mechanism includes: a body provided with a lens hole, the lens hole is configured for mounting a filter, and at least one disassembly structure provided on the body, the disassembly structure includes a sliding portion configured to be detachably and slidably connected to the assembly mechanism.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

A variable optical filter is disclosed including a bandpass filter and a blocking filter. The bandpass filter includes a stack of alternating first and second layers, and the blocking filter includes a stack of alternating third and fourth layers. The first, second and fourth materials each comprise different materials, so that a refractive index of the first material is smaller than a refractive index of the second material, which is smaller than a refractive index of the fourth material; while an absorption coefficient of the second material is smaller than an absorption coefficient of the fourth material. The materials can be selected to ensure high index contrast in the blocking filter and low optical losses in the bandpass filter. The first to fourth layers can be deposited directly on a photodetector array.

The invention provides a dynamic environment adjustment method for hyperbolic glass curtain wall structural adhesive damage detection. The method comprises the following steps: acquiring detection environment parameters corresponding to a hyperbolic glass curtain wall, which are acquired by a preset multi-source environment sensing array in real time; outputting a first adjusting signal of an ultrasonic detection module and a second adjusting signal of an infrared thermal imaging module corresponding to structural adhesive damage detection according to the detection environment parameters; the first adjusting signal is used for adjusting the frequency and power of the ultrasonic detection module, and the second adjusting signal is used for adjusting the sensitivity of the infrared thermal imaging module; a coupling agent spraying device and a waveform generator of the ultrasonic transmitting module are adjusted according to the first adjusting signal, and an optical filtering assembly of the infrared thermal imaging module is adjusted according to the second adjusting signal; reflected wave signal characteristics of the structural adhesive of the hyperbolic glass curtain wall are obtained according to the ultrasonic transmitting module, temperature field distribution characteristics of the structural adhesive are obtained according to the infrared thermal imaging module, and damage detection of the structural adhesive is completed.

The invention provides a screen foreign matter detection device and method, and belongs to the technical field of optical detection, and the screen foreign matter detection device comprises an SPAD SoC chip, a VCSEL chip, a packaging substrate, a packaging cover plate, a first optical filter, a second optical filter, a transmitting lens, a receiving lens and a lens base. The mounting position of the foreign matter detection device is selected; selecting opposite sides; recording a fixed distance during initial installation; according to the method and the device, whether foreign matters exist on the surface of the screen or not is detected by adopting linear light spots according to the setting of a foreign matter detection judgment basis, and the method and the device have the advantages of small size, low cost and high precision, can be applied to foreign matter detection of an automobile HUD and other related fields with certain requirements on projection safety, enable the screen to be more intelligent and improve the overall safety.

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 invention belongs to the technical field of optical communication, and particularly relates to a high-stability photo-generated millimeter wave system based on a phase-locked loop, which comprises a first laser, a second laser, an acousto-optic frequency shifter, a dense wavelength division multiplexer, an inner loop feedback control loop and an outer loop signal output branch, the inner loop feedback control loop comprises a phase modulator, an optical filter, a photoelectric detector, a frequency division arithmetic unit, a phase frequency detector, a loop filter, a voltage-controlled oscillator and a first power amplifier which are sequentially connected in series, and the output of the first power amplifier is connected with an acousto-optic frequency shifter; the inner loop feedback control loop further comprises a cesium atomic clock, a microwave source and a second power amplifier; wherein the cesium atomic clock is connected with the microwave source and the phase frequency detector, and the output of the microwave source is connected with the phase modulator after passing through the second power amplifier.

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.