69 results about "Light extinction" patented technology

The present invention provides a quantum entanglement light source device that takes advantage of the benefits of using optical fibers and can compensate for the decrease in polarization extinction ratio with a simple configuration. [Solution] A quantum entanglement light source device according to one embodiment of the present invention comprises a wavelength conversion unit capable of generating polarized light with a wavelength longer than the wavelength of the pump light, and a polarization control unit provided midway through optical fibers provided on both end faces of the wavelength conversion unit, capable of controlling the polarization direction of the pump light in the wavelength range.

This application relates to the field of optical polarization measurement technology, specifically to a wide-spectrum, high-bandwidth static spectral modulation Stokes polarization measurement device, comprising a polarization modulation module, a spectral sampling module, and a high extinction ratio polarizer. The polarization modulation module includes a phase retarder and a linear polarizer; the spectral sampling module has sub-nanometer spectral resolution; the high extinction ratio polarizer includes a halogen tungsten lamp and a Glan Taylor prism for generating high-purity linearly polarized light; the obtained demodulation factor and the modulation spectrum acquired by the spectral sampling module are used to invert the Stokes parameters using zero-heterodyne coherent demodulation technology. This application employs a phase retarder with high birefringence, which, for the same thickness, produces an optical path difference tens of times greater than that of quartz, increasing the Stokes polarization measurement bandwidth by a factor of the response and improving the measurement accuracy of polarization spectral parameters. Simultaneously, the zero-heterodyne coherent demodulation method is used to eliminate the dispersion interference of the phase retarder through calibration.

This invention relates to the field of optical thin film fabrication technology, specifically to a method for fabricating a high extinction ratio, adhesive-free polarizing beam splitter film resistant to high and low temperature environments. The method includes the following steps: S1, substrate pretreatment; S2, polarizing beam splitter film deposition; S3, adhesive-free bonding treatment; S4, annealing strengthening; and S5, post-treatment. This invention uses an adhesive-free optical contact bonding process to replace the traditional organic bonding process, completely eliminating the temperature adaptability bottleneck caused by organic adhesive layers. The bonding interface relies on intermolecular forces for adhesion, eliminating problems such as aging and debonding of organic adhesives. This allows the device to operate stably in a wide temperature range of -60℃ to 120℃, greatly improving the device's environmental adaptability and meeting the needs of extreme environments such as deep space exploration and polar observation.

This invention relates to the field of petroleum exploration and development technology, and is a method and system for fluid property identification based on micro-fluorescence thin section technology. The method includes acquiring the micro-fluorescence thin section spectrum of a rock sample; obtaining the true fluorescence area under blue light and the true fluorescence area under ultraviolet light based on the micro-fluorescence thin section spectrum of the rock sample; substituting the true fluorescence area under blue light and the true fluorescence area under ultraviolet light into an extinction index model to obtain an extinction index; and comparing the extinction index with an extinction index evaluation standard to identify fluid properties. This invention establishes an extinction index for identifying reservoir fluid properties. Its extinction index model extracts the pair of sensitive parameters—fluorescence area under blue light and ultraviolet light—by utilizing the spectral variation characteristics between different crude oils and different proportions of water under micro-fluorescence thin section technology. This effectively solves the problem of reservoir fluid property identification, and the method can quantitatively identify reservoir fluid properties.

This invention provides a sky-polarized light adaptive dimming system based on multi-dimensional spatial orientation compensation, belonging to the field of smart wearable device technology. This invention introduces head posture feedback and polarization vector calculation to compensate for angular errors caused by posture deviation in real time, ensuring that the lens polarization axis remains precisely orthogonal to the ambient glare axis in dynamic scenarios such as cycling and sports, maintaining the highest glare filtering efficiency. This invention crosses technical barriers by introducing biomimetic polarization coordinate system transformation and solar altitude weighting, achieving a full-posture dynamic extinction effect unmatched by traditional solutions. The deep fusion of multiple sensors in this invention solves the technical barrier of ambient light source identification. By combining polarization light sensors, inertial measurement units, and global positioning data, it can intelligently decouple sky-scattered light and ground-reflected glare, thereby achieving intelligent switching between anti-glare optimization mode and sky polarization adaptation mode, optimizing blue sky contrast while filtering strong light.

The application discloses a Brewster window stack polarization modulation device. The device comprises a Brewster window stack assembly, a clamping assembly, and an installation base. The Brewster window stack assembly comprises a plurality of optical window pieces arranged in parallel and at intervals, and the included angle between the surface normal and the incident light is a Brewster angle. The installation base has a vertical part and a horizontal part. The clamping baffle is arranged opposite to the vertical part of the installation base at intervals. The optical window pieces and the gaskets are alternately arranged in parallel at intervals. One adjusting screw is arranged on each side of the installation base. The adjusting screw passes through the clamping baffle and each gasket in sequence, and is screwed with the vertical part of the installation base. The rotation of the adjusting screw is converted into the linear motion of the clamping baffle along the support surface, so as to change the distance between the clamping baffle and the vertical part and / or realize the clamping and fixing of the Brewster window stack assembly. The device can realize linearly polarized light output with high extinction ratio and high stability in a wide range of incident angles and spectral bands.

This invention discloses a method and system for measuring and calibrating the concentration of an oil mist nano-dispersion, belonging to the field of mechanical testing technology. The invention prepares a nanobubble solution using a porous membrane tube permeation method, employing a ceramic porous membrane tube in conjunction with a pressure tank to control the nanobubble particle size and concentration. A Malvern particle size analyzer is used to measure the solution concentration, which is then adjusted to the desired concentration through proportional dilution. The nanobubble solution is considered equivalent to an oil mist dispersion, and an optical measurement device is built based on the extinction method. A 900nm laser is used to irradiate the solution in a high-transmittance container, and the transmitted light attenuation intensity is measured using an optical power meter. The solvent used is carbon tetrachloride, chloroform, or dichloromethane, and the nanobubble gas is carbon dioxide, water vapor, or methane. The concentration is calculated based on Lambert-Beer's law. This method achieves stable control of oil mist concentration, avoids sampling errors, and improves the calibration accuracy and reliability of the oil mist detector.

This invention relates to a method, apparatus, and system for optimizing the sensitivity, extinction ratio, and EMI of long-distance optical modules. The method mainly includes: detecting the output sensitivity of the optical module at different temperatures; compensating and adjusting the voff voltage based on the sensitivity shift at different temperatures; after compensating and adjusting the voff voltage, compensating and adjusting the bias current based on the optical power shift at different temperatures; detecting the output extinction ratio of the optical module at different temperatures; compensating and adjusting the Vmod voltage based on the extinction ratio shift at different temperatures; detecting the EMI of the optical module at different temperatures; if the EMI is unqualified, compensating and adjusting the Vmod voltage; if the EMI is still unqualified after multiple compensation and adjustments of the Vmod voltage, compensating and adjusting the RX amplitude voltage and RX pre-emphasis voltage to ensure that the sensitivity, extinction ratio, and EMI of the optical module are all qualified. This invention can optimize the sensitivity and extinction ratio of the optical module to the optimal value at various temperatures while ensuring EMI compliance.

This invention relates to the field of substance concentration measurement technology and discloses a VOCs concentration distribution monitoring system in a spray booth, including a feature detection module, a signal receiving module, a pneumatic protection module, a concentration inversion module, and a differential pressure adjustment module. The signal receiving module receives the transmitted signal through a central detector and captures the forward scattered signal using a ring detection array. The concentration inversion module determines the particle size shift of paint mist particles during the phase transition process based on the ratio of transmitted to scattered light intensity, thereby correcting the extinction section parameter in real time and outputting concentration data. The differential pressure adjustment module maintains a slightly positive pressure inside the pneumatic protection module that is 5 Pa to 15 Pa higher than the ambient static pressure. This invention utilizes the scattering physical characteristics to offset the measurement error caused by the nonlinear attenuation of paint mist particle size in situ, effectively eliminating the optical path signal interference caused by droplet evaporation in a multiphase flow field.

This invention discloses a laser measurement method and system for measuring temperature and particle size in non-isothermal multiphase flow, belonging to the field of optical measurement and laser diagnostics. The method includes: generating multispectral illumination light; acquiring RGB color images of the flow before and after transient non-isothermal multiphase flow; separating the two image channels to obtain a single-channel reference image and a single-channel detection image; calculating the logarithmic extinction value of each pixel at the wavelength of that channel based on its single-channel reference image and single-channel detection image; taking any channel wavelength as the reference wavelength, decoupling the temperature-related absorption coefficient and particle size-related scattering coefficient at the reference wavelength based on the logarithmic extinction value and a pre-constructed lookup table; and using a structured index to search the lookup table and invert the temperature and particle size values ​​of each pixel at the reference wavelength, generating a spatially resolved temperature and particle size distribution map at the reference wavelength. This invention improves computational efficiency and reduces system cost.

The application provides a laser radar and an automatic driving device. The laser radar comprises a shell, a window sheet, a transmitting module, a receiving module and a rotating mirror. The receiving module is located on one side of the rotating mirror, and the transmitting module is located on the other side of the rotating mirror. The shell comprises a first opening and a first boss. The first boss comprises a first sub-boss and a second sub-boss. The transmitting module comprises a transmitting lens barrel. The window sheet is embedded in the first opening. The first sub-boss is located between the transmitting lens barrel and the rotating mirror. The rotating mirror is located between the second sub-boss and the window sheet. The transmitting lens barrel comprises a light outlet. The light outlet is located between the window sheet and the first sub-boss. The first boss is used as an extinction structure to separate the internal space of the laser radar at the transmitting end, which can effectively reduce the influence of stray light on the detection accuracy of the laser radar.

This invention discloses a narrowband polarization metasurface for suppressing long-wave infrared angular dispersion and its fabrication method, relating to the field of optical component technology. Addressing the problems of difficult fabrication and strong angular dispersion inherent in existing polarizers, the metasurface of this invention comprises a barium fluoride substrate and a double-layer composite grating structure disposed on its surface. The composite grating includes a bottom arsenic selenide grating and a top metal layer. By limiting the period of the composite grating to 5.5-6.25 micrometers and the width of a single double-layer grating structure to 4.5-5.5 micrometers, the downward-leaking guided modes and Fabry-Perot cavity modes within the structure undergo strong compression in momentum space, resulting in band folding and anti-crossing flat-band effects. This invention not only relaxes the feature size to the micrometer level, significantly reducing fabrication difficulty, but also fundamentally suppresses the strong angular dispersion of plasmon resonance in narrowband, achieving a high polarization extinction ratio under large angle tolerance and greatly reducing the collimation requirements of practical optical paths.

The application discloses an aluminum alloy floor protective layer defect image recognition method and system, relates to the technical field of computer vision image recognition, and comprises several function modules, including: a three-dimensional morphology pre-perception module, which obtains three-dimensional point cloud data of the surface of an aluminum alloy floor protective layer, calculates a local normal vector and a high light reflection risk coefficient, and divides a field of view into a low-curvature area and a high-curvature area to be scanned based on the high light reflection risk coefficient; an adaptive polarization regulation and control imaging module, which calculates an optimal extinction angle for the low-curvature area according to the local normal vector, fixes a detection angle, collects a single frame of polarized image, performs detection angle gradual scanning with the optimal extinction angle as the center for the high-curvature area to be scanned, and collects a plurality of polarized image sequences; and a multi-frame polarization fusion and defect enhancement module, which establishes a physical model of light intensity change with a detection angle for a plurality of polarized image sequences pixel by pixel, and separates a non-polarized light intensity component image and a polarization modulation amplitude image through fitting.

This invention relates to a method for improving the accuracy of seawater profile data obtained by lidar remote sensing. It employs a laser transmitter and an optical receiver to emit laser light and receive Raman and elastic scattered light. A processor calculates the ratio of the elastic scattered main wave signal to the Raman scattered signal at the elastic main frequency, thus largely eliminating the influence of path extinction in the observed values. By measuring seawater Raman scattering, this invention eliminates the effects of scattering and absorption along the light path, increasing the accuracy of lidar measurements of the ocean's vertical profile and improving our understanding of the marine environment.

The utility model discloses an environmental light interference's infrared receiving tube of gathering light line type, including package shell, condenser lens, infrared photosensitive chip, connecting wire and conducting strip, the package shell includes base plate and cover shell, is equipped with the welding tin tray on the conducting strip, and infrared photosensitive chip is connected with the welding tin tray through the connecting wire, and the condenser lens is located on the cover shell, and the four around of condenser lens is equipped with plane part, and the plane part has coated extinction coating, and the rest part of condenser lens except plane part has coated anti -reflection coating. The utility model discloses the electric connection structure of setting infrared photosensitive chip, conducting strip and welding tin tray in package shell, can realize the stable output of infrared signal, and the plane part of condenser lens has coated extinction coating, and the rest part has coated anti -reflection coating, and extinction coating can absorb the interference visible light and stray infrared light of side, reduce the influence of environmental light interference, and anti -reflection coating can reduce interface reflectivity, improve the transmittance of target direction incident infrared light.

This application discloses a beam cutting device and laser processing equipment. The beam cutting device includes a cavity, a swing arm, an optical lens, and an extinction device. The cavity has an inlet and an outlet, forming an optical path between them. The swing arm is rotatably mounted in the cavity and has at least three phases. The optical lens and the extinction device are respectively mounted on the swing arm. A driving component drives the swing arm to rotate and switch between the three phases. In the first phase, the optical lens is located in the optical path to change the mode of the laser. In the second phase, the extinction device is located in the optical path to block the laser from passing through. In the third phase, the swing arm, optical lens, and extinction device allow the laser to pass through while avoiding the optical path. Therefore, this beam cutting device can be used to adjust the on / off state of the optical path and to adjust the mode of the laser, offering rich functionality.

This invention discloses an anti-reflective fiber for automobiles and its preparation method, belonging to the field of fiber technology. It solves the problems of existing technologies, such as the inability to adjust light intensity, high reflected light intensity, and lack of sustained diffuse reflection. The fiber comprises a monofilament body with irregular cross-sections (multi-leaf, cross-shaped, W-shaped, etc.), and a temperature-sensitive micro-adhesive with a textured surface irradiated onto the monofilament body. By irradiating the surface of the monofilament body with the temperature-sensitive micro-adhesive, the invention allows the monofilament body to control the absorption of light by individual filaments based on temperature, ensuring sufficient illumination inside the car at night while effectively absorbing high-intensity light during the day to prevent glare. The monofilament body is filled with a matting agent and nano-silica, utilizing these agents to capture, absorb, and scatter light, fundamentally reducing reflected light intensity. A stable, rough structure is constructed on the surface of the monofilament body through radiation cross-linking, ensuring efficient and sustained diffuse reflection.

This invention discloses a backscattering light testing device and method based on biased field of view measurement. The device includes a light source module, an optical path control and scattering measurement module, and a signal modulation and detection module. The light source module includes a high-power laser, a collimating mirror, an aperture, and a chopper. The laser, collimating mirror, aperture, and chopper are coaxially arranged on the incident light path. The optical path control and scattering measurement module includes a centrally apertured reflector, a sample under test, and an extinction cavity. The centrally apertured reflector includes a central transparent area and a ring-shaped reflective surface. The signal modulation and detection module includes a photodetector and a lock-in amplifier. The lock-in amplifier is connected to the photodetector and the chopper, respectively, and is used to extract the off-axis scattered light signal. The off-axis scattered light signal is used to infer the backscattered light. This device completely avoids beam splitter scattering at the physical level, has strong noise suppression capability, and features superior measurement principle, simple system structure, large dynamic range, and wide applicability.

The present application belongs to the technical field of automobile parts manufacturing, and relates to a preparation method of a low reflectivity support for a vehicle-mounted camera, comprising the following steps: (1) preparing a support body comprising a field angle region; (2) performing structured light extinction treatment on the surface of the field angle region to increase the surface roughness or form a light diffusion structure, wherein the structured light extinction treatment comprises setting a sawtooth structure or a gradient refractive index layer; and (3) sequentially coating a water-based sand black primer layer and a water-based elastic topcoat layer on the field angle region subjected to the structured light extinction treatment to form a composite light extinction coating layer. The preparation method of the low reflectivity support for the vehicle-mounted camera provided by the present application can effectively suppress reflection interference while ensuring the mechanical performance and environmental durability of the support.

The invention discloses an ultralow backscattering extinction device for weak light detection. The center of the end face of one end of the outer shell is provided with a circular inlet used for receiving emergent light beams from a telescope. An inlet shading short cylinder with a visual angle is arranged on the inner side of the circular inlet; more than two groups of light blocking ring assemblies are arranged on the side wall of the cylindrical inner cavity in the closed inner cavity of the outer shell along the optical axis direction; a bottom center cone is arranged in the center of the bottom of an inner cavity of the outer shell, and a conical surface microstructure is arranged on the surface of the bottom center cone; a conical tip trap hole is formed in the conical tip of the bottom center cone in the optical axis direction. The bottom of the conical tip trap hole is provided with a hole bottom inclined absorption surface which is inclined relative to the optical axis and used for enabling light in the hole bottom mirror reflection direction to deviate from the inlet optical axis. The objective of the invention is to solve the problem of measurement of backward stray light generated in the process that an exit pupil of a telescope on a space gravitational wave optical platform emits opposite light.

This invention belongs to the field of integrated optical device technology, specifically relating to a microring resonator and its fabrication method. The device comprises: a substrate; a ring waveguide disposed at the center of the substrate; a U-shaped waveguide disposed on the substrate, wherein the U-shaped waveguide is formed by two straight waveguide segments and a semi-circular arc waveguide connected end-to-end, with the ring waveguide positioned between the two straight waveguide segments to form coupling; and an etched aperture located at the center of the semi-circular arc waveguide; an input waveguide disposed on the substrate and connected to one straight waveguide segment; and an output waveguide disposed on the substrate and connected to another straight waveguide segment. This invention provides controllable loss by introducing an etched aperture in the U-shaped waveguide, achieving coupling interference between discrete and continuous modes to generate asymmetric Fano resonance. By adjusting the waveguide length and the aperture size, high extinction ratio, large slope, or uniform resonance can be achieved at the target wavelength. This device has a simple structure, is easy to manufacture, is compatible with silicon photonics processes, and is suitable for high-performance photonic integrated systems.

The application provides a lottery information non-contact recognition method and device based on multi-mode optical imaging, which comprises the following steps: step 1, starting an infrared backlight light source, controlling the light path conduction through a mechanical light shield, collecting an infrared transmission image of the lottery, and locating a key information area based on the difference in infrared transmission characteristics of different areas; step 2, in the key information area, sequentially switching the light path through the mechanical light shield, respectively conducting a ring-shaped diffuse normal light source and a low-angle grazing light source, and collecting at least two visible light images by using orthogonal polarization extinction structure; and step 3, taking the at least two visible light images as input, inputting a lightweight OCR engine to complete the lottery information recognition after processing by a preset strategy, so that the most suitable image for recognition is captured at the physical level through the innovative multi-spectral light source configuration, orthogonal polarization extinction technology and mechanical light source time sequence control, thereby greatly simplifying the back-end processing.

This invention discloses a method for preparing surface-modified spherical hollow nanoshell NiS and its application, relating to inorganic non-metallic materials and their application in the field of passive interference technology. The prepared surface-modified spherical hollow nanoshell NiS can be used as a novel passive smoke screen interference material. Its particle surface is hydrophobically modified, making it less prone to agglomeration and exhibiting good flow properties, thus improving the compatibility of the product with equipment in practical applications. Its crystal configuration and unique hollow structure give it strong absorption and scattering capabilities. The nanometer thickness of the hollow spherical structure can excite the small size effect and quantum size effect of the material, and it has high extinction capabilities in the visible light and near-mid-far infrared bands. Compared with traditional smoke screen interference materials, it has great performance advantages, and the preparation process is simple, efficient, and low in cost.

An anti-interference ultra-high time-resolution laser diagnostic method and device, belonging to the field of laser diagnostic technology, utilizes an ultra-high-speed wavelength modulation device with a GHz bandwidth to achieve GHz-level wavelength modulation of the laser output light, thereby improving the time resolution of laser diagnostics from the existing hundreds of kHz level to the GHz level, reaching the nanosecond level of detection. It can accurately capture the rapid evolution process of combustion and explosion flow fields at the nanosecond to microsecond scale, filling the technological gap in ultra-high-speed detection of nanosecond-level combustion and explosion flow fields. By mixing and filtering to extract multiple harmonic signals and performing ratio normalization processing on the harmonic signals, the influence of various interference factors such as light intensity fluctuations, radiation background, particle / droplet extinction, and signal scattering attenuation is fundamentally eliminated, obtaining a stable absorption characteristic signal independent of light intensity changes. This solves the problems of signal submersion and spectral distortion in traditional optical measurements in strongly disturbed combustion and explosion environments, and can work stably in extremely complex combustion and explosion flow fields.

The application provides an electro-optical modulator and an optical quantum computer, and relates to the technical field of electro-optical modulation.The electro-optical modulator comprises a waveguide optical path structure, a direct current bias structure and a radio frequency modulation structure.The waveguide optical path structure comprises an input end optical waveguide, a light splitting waveguide, a first modulation arm, a second modulation arm, a beam combining waveguide, a curved waveguide and an output end optical waveguide connected in sequence.The output end optical waveguide is arranged side by side with the input end optical waveguide and is connected with the curved waveguide.The direct current bias structure is arranged on the two sides of the first modulation arm.The radio frequency modulation structure is arranged on the two sides of the first modulation arm and the two sides of the plurality of second modulation arms.The light signal directions of the input end optical waveguide and the output end optical waveguide are opposite.Compared with the prior art, the application can realize the same side coupling of the input and output optical ports, the overall size is smaller, the degree of integration is higher, the light directly entering the light outlet port is avoided, the optical crosstalk is reduced, the extinction ratio is improved, and the optical signal transmission effect is improved.