248 results about "Optical pathlength" patented technology

The present application relates to the technical field of optical aspheric surface, especially points to a kind of free curved surface characterization method based on CGH lens zero position compensation detection optical path, with the detection of free curved surface as the guide, based on zero position compensation detection principle, according to ray tracing method, Snell's law, diffraction principle and equal optical path principle, using the parameters required by interferometer incident wave front as plane wave, compensator as single CGH lens zero position compensation detection system indirectly characterizes free curved surface shape, by using XY polynomial and Zernike standard phase polynomial, the mathematical description of free curved surface is realized in design stage can determine its measurement scheme, and according to the characterization method self-defined a kind of aspheric surface type, called zero position free curved surface.The free curved surface characterization method improves the degree of freedom of free curved surface shape and the feasibility of zero position compensation method, reduces the detection difficulty of free curved surface shape, realizes the function of zero position free curved surface design can be detected.

This invention discloses a two-axis multi-frame spatial beam pointing system based on a follower mirror and its design method, belonging to the field of photoelectric tracking and aiming. The system includes an outer azimuth axis, an outer pitch axis, an inner pitch axis, an inner azimuth axis, and a follower mirror; the inner pitch axis is coaxial with the outer pitch axis and both are hollow axes; the follower mirror is mounted on the inner pitch frame, and its rotation axis is parallel to the inner azimuth axis. This invention compensates for the optical axis tilt caused by the movement of the inner azimuth axis through the following motion of the follower mirror, and establishes an optical axis offset model for parameter optimization to reduce the optical axis offset. Simultaneously, a Coudre optical path change model is established for focusing of the tracking imaging component. Compared with the traditional two-axis four-frame structure, this invention simplifies the Coudre optical path, reduces debugging difficulty, improves the optical chamber ratio, and realizes the effective application of a multi-frame structure in a spatial beam pointing system.

A spectroscopic method of estimating the cadmium concentration in an aqueous sample including: preparing at least 5 aqueous calibration samples, each calibration sample including water, a pH regulator in an amount such that each calibration sample has a pH of from 8 to 10, an equal concentration of dimethylglyoxime and dissolved cadmium in an amount of from 0 to 12 μg / mL; and, measuring over optical path length (l) the absorbance for each calibration sample of radiation (R) having a wavelength of from 520 to 540 nm, thereby generating calibration data. The method further includes: forming a treated aqueous sample; measuring over the optical path length (l) the absorbance for the treated aqueous sample of radiation (R) having a wavelength of from 520 to 540 nm; generating test data; and, estimating the concentration of cadmium in the aqueous sample from the test data and the calibration data.

The application discloses a ternary computing method and system based on a double-chain difference coupling principle. A difference value (XnYn) is directly generated by a forward component Xn and a reverse component Yn in a difference coupling area, forming a three-value logic {‑1, 0, +1}, and a threshold comparison circuit is omitted, and operation follows BH=Σ(XnYn)×3^n. A hierarchical logic system composed of basic operators, minimum complete operators and global operators is constructed, and arbitrary three-value logic operation is realized; a circular waveguide structure is adopted to configure an optical path difference, so that coherent light directly forms three interference states at an output end, and optical three-value logic gates and optical full adders are realized; a double-chain six-bit structure is adopted for symbol coding, a two-dimensional geometric framework is driven to generate a symbol form, and logical and geometric expression unification is realized.

A kind of mid-infrared supercontinuum light source of spatial light structure, comprising: pump source, for generating pump light;Collimating lens, for collimating pump light, output parallel light;Grating pair, by two grating parallel placement, for according to frequency to the light input to grating pair Spectral splitting is realized and the optical path of each frequency light is changed, output transmission light to roof prism;It is also used for the light that returns to grating pair from roof prism by original road to be compounded and pulse compression is realized, output compressed light to reflector;Roof prism, for the light that transmits grating pair is reflected again and transmits grating pair;Reflector, for reflecting the compressed light;Focusing lens, for focusing the compressed light reflected by the reflector;Fluoride fiber, the compressed light after focusing of focusing lens is spatially coupled into fluoride fiber at focal point, output mid-infrared supercontinuum laser.The utility model discloses in spatial light coupling system using grating pair compression pulse, the further widening of supercontinuum is realized.

This invention discloses a coaxial dual-cavity optical detection system, relating to the field of gas detection, which solves the problems of poor portability and low laser utilization in existing equipment. The system includes an air inlet, two coaxially arranged cavities with the inner cavity located inside the outer cavity, a vent, an outlet, a plano-concave mirror, and symmetrical window mirrors. The two cavities are interconnected through the vent, allowing for gas filling and exhaust with a single gas path. Coaxial parallel plano-concave mirrors are installed within the cavities, working in conjunction with an external reflector, convex lens, and detector to guide refracted light incident on the inner cavity into the outer cavity for utilization, forming a closed loop in the optical path of the two cavities. This system significantly reduces longitudinal and lateral dimensions, improving portability; simultaneous dual-cavity detection improves detection accuracy; the utilization of refracted light enhances laser utilization and sensing efficiency; and the increased effective optical path within a limited volume improves gas detection sensitivity, making it suitable for trace gas detection.

The utility model provides a kind of for the illumination reaction device of alfacalcidol, including the liquid storage tank to be lighted, circulating pump and illumination reaction tank formed by pipeline connection circulation passway, wherein: illumination reaction tank center is provided with the LED light of cylindrical shape, and there are a plurality of upper and lower interval arrangement partition plates in periphery, and the serpentine reaction channel of upper and lower bending is formed between a plurality of partition plates.The utility model illumination reaction device can realize uniform stable illumination reaction by the design of illumination reaction tank and serpentine reaction channel, reduce the optical path of reaction liquid, improve alfacalcidol illumination reaction efficiency and product quality consistency, effectively overcome the technical defects of traditional equipment.

The present application relates to the field of optical imaging technology, and particularly relates to a full-depth-range high-lateral-resolution OCT imaging method, system and storage medium based on interference synthetic aperture. The OCT imaging method comprises sample positioning: moving the point spread function of the sample to a region close to 0 optical path; collecting three-dimensional original data; pre-processing the collected three-dimensional original data to obtain complex signals containing amplitude and phase information; performing three-dimensional Fourier transform on the scattering potential distribution based on a synthetic aperture algorithm to obtain frequency domain signals, correcting the nonlinearity of the spatial frequency by interpolation or frequency domain filtering before interpolation, and then performing inverse Fourier transform to reconstruct the spatial distribution of the scattering potential and obtain three-dimensional image data. The detail information of the defocus region is recovered, high-resolution imaging in the full depth range is ensured, and the inherent contradiction between lateral resolution and focal depth is broken through.

A display substrate and a display device are disclosed. The display substrate includes a substrate, a pixel defining layer, a light-shielding layer, and an optical path adjustment layer. The pixel defining layer is disposed on the substrate and includes a plurality of sub-pixel openings. The light-shielding layer is disposed on the side of the pixel defining layer away from the substrate and includes a plurality of first light-transmitting openings, wherein, in a direction perpendicular to the substrate, the plurality of first light-transmitting openings overlap with the plurality of sub-pixel openings. The optical path adjustment layer is disposed on one side of the light-shielding layer and includes a plurality of optical path adjustment regions, wherein, in a direction perpendicular to the substrate, the plurality of optical path adjustment regions overlap with the plurality of first light-transmitting openings. The optical path adjustment layer has different optical path lengths in the plurality of optical path adjustment regions. This display substrate has a better display effect.

The application belongs to a polarization Michelson wind measurement interferometer, and aims at the technical problems of resolution reduction, instrument volume and weight increase caused by internal movement components or aperture division of the existing wind imaging interferometer, and provides a polarization Michelson wind measurement interferometer based on LCVR and a measurement method thereof. Incident light is sequentially divided into transmitted light and reflected light after passing through a front telescope system, a first linear polarizer and a polarization beam splitter. The transmitted light forms first linearly polarized light by passing through a first compensation glass, a second compensation glass and a first achromatic quarter-wave plate. The reflected light forms second linearly polarized light by passing through a third compensation glass and a back surface of a second achromatic quarter-wave plate. The first linearly polarized light and the second linearly polarized light have an optical path difference and orthogonal polarization directions. The first linearly polarized light and the second linearly polarized light are sequentially imaged on a surface array CCD after passing through a first imaging lens, an aperture diaphragm, a second imaging lens, an LCVR and a second linear polarizer.

This invention discloses a method and apparatus for measuring the depth of through-silicon vias (TSVs) based on a front-mounted objective reference module. The method includes: S1: Light emitted from a light source unit sequentially passes through a tube lens, objective lens, and beam splitter / combiner element before illuminating a non-hole region of a sample with a TSV. A spectral acquisition unit receives the returned light, obtains the interference spectrum signal, and processes it to obtain the system bias optical path characteristic corresponding to the round-trip optical path difference between the reference reflector and the non-hole region; S2: The sample is moved so that the light source unit is positioned on the TSV as described above, and the system bias optical path characteristic corresponding to the round-trip optical path difference between the reference reflector and the bottom of the TSV is obtained; S3: The physical depth of the TSV is calculated; S4: Anomalies occurring in steps S1 and S2 are handled. This method features high stability and a high signal-to-noise ratio, which helps promote the large-scale use of high-precision TSV measurement equipment in complex production line environments.

This invention discloses an adaptive end-to-end network learning-driven polarization descattering depth estimation method. It proposes a physics-driven end-to-end network to simultaneously acquire clear reconstructed images and high-precision depth images in scattering environments. The method first acquires linearly polarized images of the scene in four directions, extracting light intensity and linear polarization feature maps through decoupling calculations. Then, a dual-task network including a polarization-guided fusion module is constructed. Utilizing the physical sensitivity of DOLP to scattering particle concentration and optical path length, it transforms these into a spatial attention mask, physically constraining and enhancing the shallow texture of the intensity map in the feature space. Finally, dehazing and depth estimation branches are encoded and decoded in parallel. This invention overcomes the intensity-depth ambiguity of traditional RGB images, effectively suppressing the interference of non-uniform fog on geometric perception and visual texture, and achieving high-precision scene depth estimation and high-fidelity dehazing imaging under adverse weather conditions.

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.

The application discloses an interference filter type multi-wavelength erbium-doped fiber laser based on optical path difference regulation, relates to the technical field of a ring-shaped tunable multi-wavelength erbium-doped fiber laser, and comprises a pump source, a wavelength division multiplexer, an erbium-doped fiber, an isolator, a first optical fiber coupler, a three-paddle polarization controller, a polarizer, a Mach-Zehnder interferometer filter containing an adjustable delay line, a black phosphorus saturable absorber and an extrusion type polarization controller which constitute a ring cavity. By connecting a 0-6.6 cm continuous adjustable delay line to one arm, the optical path difference of the filter two arms is accurately regulated, and continuous precise tuning of wavelength spacing of 0.3 nm to 1.54 nm is realized; meanwhile, by combining the nonlinear polarization rotation effect and the hybrid mode-locking mechanism of the few-layer black phosphorus, the mode-locking threshold is significantly reduced, and the long-term stability of the pulse is improved. The laser can realize stable emission of up to six wavelengths at the same time, the wavelength drift is less than 0.75 nm, and the power fluctuation is less than 7.0 dB.

The present application relates to the field of spectral analysis, and relates to an absorption spectrometer and a direct measurement method of absorption light intensity. The present application provides an absorption spectrometer which can directly measure absorption light intensity. The absorption spectrometer comprises a light source assembly, a sample cell, a semi-transparent mirror and a light detector. The absorption spectrometer also provides a direct measurement method of absorption light intensity. In the front light path of two coherent lights, a same sample cell is placed in each light path. The optical path of one light is adjusted until the output of the light detector included in the absorption spectrometer is minimum. Then, a sample to be measured is added to one sample cell, and a blank solution is added to the other sample cell. At this time, the light detector measures the intensity of the remaining light which is not completely cancelled after the convergence of the two lights, i.e. the intensity of the light absorbed by the sample to be measured, i.e. the absorption light intensity. The absorption spectrometer provided by the present application detects absorption light intensity, while the traditional absorption spectrometer detects absorbance. Changing the detection of absorbance to the detection of absorption light intensity can avoid the quantum noise of a large signal from drowning out a weak signal, thereby greatly improving the detection sensitivity of the absorption spectrometer.

The invention discloses a compact arbitrary transverse mode laser. The laser comprises a pumping source, a pumping focusing optical system, a laser total reflective mirror, a laser gain medium, a laser output mirror and an astigmatism mode converter, the pumping source emits pumping light in a gain medium absorption band; the pump light is focused and then enters the gain medium; the gain medium absorbs the pump light and generates laser gain; the total reflective mirror highly reflecting laser wavelength and the output mirror partially transmitting the laser wavelength jointly form a simple linear resonant cavity. When the laser gain medium is inclined by a preset angle relative to the optical axis of the resonant cavity, meridian light and sagittal light pass through different optical paths of the gain medium to introduce astigmatism, an HG mode facing the directions of two astigmatism symmetry axes can be reproduced, and modes facing other directions cannot be reproduced due to the astigmatism effect. Therefore, when the pump light deviates from the axis of the resonant cavity in the directions of the two astigmatic symmetry axes, any high-order HG mode with mode ordinal numbers not being zero in the two directions can be excited, and any LG mode laser can be generated through astigmatic mode conversion.

An optical device for enabling more flexible and precise control of spectral reflectance in a selected wavelength range having a maximal wavelength (λmax) and a minimal wavelength (λmin). The device includes a first Mach-Zehnder interferometer (MZI), including first and second legs having a tunable first optical pathlength difference (OPD) greater than 2×λmax, and a second MZI, coupled in series with the first MZI and including third and fourth legs having a tunable second OPD less than 2×λmin. An optical coupler is configured to direct an input optical signal in the selected wavelength range into the first and second MZIs and to output a reflected optical signal from the first and second MZIs. A controller is configured to adjust the first and second tunable OPDs to control the spectral reflectance of the reflected output optical signal.

This utility model discloses a curved semi-transparent uniform light-emitting structure, belonging to the technical field of optical display equipment. It includes: a curved display screen; and a light-emitting component comprising a dot matrix screen and a light-emitting plate. Both the dot matrix screen and the light-emitting plate are curved, and their curvatures are the same as those of the curved display screen. The dot matrix screen, the light-emitting plate, and the curved display screen are sequentially bonded together. A plurality of light-transmitting holes are uniformly distributed on the light-emitting plate, and the vertical distance from each light-transmitting hole to the inner surface of the curved display screen is equal. An intelligent companion robot is also disclosed, integrating the aforementioned curved semi-transparent uniform light-emitting structure. Through "co-curvature bonding + equal optical path design," the curvatures of the dot matrix screen, the light-emitting plate, and the curved display screen are consistent and tightly bonded, ensuring that the vertical distance from each light-transmitting hole to the display screen is equal. This eliminates problems such as bright spots, dark areas, or blurred edges caused by differences in optical path, achieving a highly consistent brightness and a soft, continuous semi-transparent light emission effect across the entire area.

This invention provides a method and instrument for measuring the thickness of multilayer films based on Taylor polynomial fitting coefficient analysis. The method involves acquiring the interference signal of the multilayer film under test output by a shared-arm interference structure, wherein the reference optical path of the shared-arm interference structure and the sample optical path share the same physical transmission optical path. The interference signal is down-processed to obtain a baseband interference signal with a center frequency near zero. Taylor polynomial expansion is performed on the baseband interference signal at the point where the optical path difference is zero, and a Taylor expansion coefficient sequence is obtained. A linear equation system is constructed based on the Taylor expansion coefficient sequence, and the coefficients of the characteristic equation are solved. The optical path difference corresponding to each layer of the multilayer film under test is obtained by solving the characteristic equation. The physical thickness of each layer is calculated based on the optical path difference corresponding to each layer and the refractive index of the film material.

The application provides a display device and a mobile terminal. The display device comprises a function-adding area and a display area located at the periphery of the function-adding area. The function-adding area comprises a function area and a first transition area located between the display area and the function area. The display device comprises a display panel and a cover plate arranged on the display panel. The cover plate comprises a cover plate main body. A first groove is arranged on the cover plate main body. The first groove is located in the first transition area and surrounds the function area. The cover plate further comprises a light shielding layer. The light shielding layer is filled in the first groove, thereby avoiding the thickness difference of the cover plate at different positions in the function-adding area, preventing the light path difference of light passing through different positions of the cover plate from being inconsistent, and ensuring the imaging quality of the camera.

The present application relates to a kind of equal optical path adjustment and detection system and method for unpolarized light splitting prism, equal optical path adjustment and detection system includes adjusting mechanism, fixed base, wide spectrum light source, first wedge optical flat, second wedge optical flat, first confocal distance measuring module, second confocal distance measuring module and interference detection component;The plane of first wedge optical flat is towards the first exit surface of first half prism;The plane of second wedge optical flat is towards the exit surface of second half prism;The measuring end of first confocal distance measuring module is towards the inclined plane of first wedge optical flat;The measuring end of second confocal distance measuring module is towards the inclined plane of second wedge optical flat.The present application establishes external optical reference surface by two pieces of wedge optical flat, independently measures air gap of wedge optical flat and corresponding half prism by combining first confocal distance measuring module and second confocal distance measuring module respectively, makes air optical path difference zero, eliminates group velocity dispersion mismatch.

The present disclosure disclose a camera optical lens including a first prism, a first lens group with a first lens and a second lens, and a second lens group with a third lens, fourth lens, and fifth lens. The first lens group is movably adjustable. The design satisfies: 4.00≤fA / IH≤4.80; 0.10≤Rp1 / Rp2≤1.00; and 0.20≤d5 / d7≤1.20. By dividing the five-element lens into a first lens group and a second lens group, with the first lens group being movably adjusted for focus, an internal focusing mechanism is achieved; configuring the ratio of the focal length to the image height (fA / IH) in the first state enables a longer focal length under a fixed image height; designing a concave-convex configuration for the first prism mitigates the degree of light deflection through the lens elements; and strategically allocating the thicknesses of the third and fourth lenses contributes to compressing the total optical length.

This invention relates to a wide dynamic range laser spectroscopy gas concentration detection device and method. The device includes: a long-path absorption cell comprising two opposing first and second concave mirrors, wherein during operation, a first laser beam undergoes multiple reflections between the two concave mirrors to form a first absorption optical path; an optical resonant cavity sharing a gas cavity with the long-path absorption cell, comprising a second entrance window and a second exit window disposed at the geometric center region of the first and second concave mirrors, wherein the geometric center region is the non-spot region of the first laser beam; and a pair of high-reflectivity mirrors respectively disposed on the second entrance window and the second exit window, wherein during operation, the second laser beam undergoes multiple reflections between the two high-reflectivity mirrors to form a second absorption optical path; the second absorption optical path is not less than 100 times the first absorption optical path. This invention combines the advantages of both the long-path absorption cell and the optical resonant cavity, achieving full-range gas concentration measurement from ultra-low concentrations (ppb) to percentage concentrations through a single gas chamber.

The present disclosure relates to the field of optical technology, and particularly to a sensor module, a SHIM optical system and an electronic device. The present disclosure aims to solve the technical problem that the existing light-transmitting cover plate is inclined to the optical axis to generate astigmatism, affecting the imaging clarity. The sensor module of the present disclosure is applied to a SHIM optical path, which includes a photosensitive chip and a correction module arranged in sequence along the optical axis, coaxially arranged, easy to assemble and adjust; the correction module includes a light-transmitting cover plate and at least one light-transmitting flat plate, the light-transmitting cover plate is arranged on the light-incident side of the photosensitive chip, and the at least one light-transmitting flat plate is arranged on the side of the light-transmitting cover plate away from the photosensitive chip; wherein the first included angle between the at least one light-transmitting flat plate and the first reference surface is an acute angle. Before the light enters the light-transmitting cover plate and the photosensitive chip, the light passes through the light-transmitting flat plate for refraction, thereby reducing the optical path difference between the meridional beam and the sagittal beam of the light, correcting the astigmatism, and improving the imaging clarity.

According to the application, a wide-range quasi-distributed optical fiber sensing method and system are provided, which comprises: linear sweep light outputting local light and signal light through a linear sweep light source module; the signal light enters a weak reflection point array sensing module to generate reflected light after being reflected by the reflection points; the reflected light and the local light enter a coherent detection module to interfere to obtain interference light; the coherent detection module converts the interference light signal into an electric signal; the electric signal enters a signal processing module to perform Fourier transform to obtain a corresponding frequency spectrum signal; the frequency spectrum signal selects beat frequency signals corresponding to weak reflection points A and B at two ends of a target optical fiber by using a band-pass filter, obtains a current time domain signal based on the beat frequency signals, and thus obtains a frequency value of a difference frequency term; the optical path between the A and B points is calculated according to the frequency value of the difference frequency term; and the temperature change and strain of the optical fiber are obtained by detecting the optical path change.

The application relates to the technical field of semiconductor front-end detection, and discloses a dark-field detection system, specifically a detection system and a defect detection device. In the technical scheme provided by the application, the loading or unloading of an adjusting mirror group on the propagation path of an incident light beam is controlled to form oblique incident light beams and vertical incident light beams with different incident angles, the adjustment of different incident modes of the incident light beam is realized, and one main incident light beam is shared by the oblique incident light beams and the vertical incident light beams, so that the redundancy of the system is reduced. In addition, a focusing objective lens which can be synchronously controlled with the adjusting mirror group is arranged, the position change of the focusing objective lens on the optical axis of the incident light beam is controlled to realize the adjustment of the corresponding focal lengths of the oblique incident light beams and the vertical incident light beams, and the optical paths of the oblique incident light beams and the vertical incident light beams are kept consistent.

This invention discloses a delay compensation device, a delay compensation method, and a phased array laser terminal. Multiple transmitting optical paths, a sampling and monitoring module, and a phased array antenna are sequentially connected in communication. Each transmitting optical path includes a first optical delay line and a first high-speed phase shifter. The sampling and monitoring module determines a first delay control parameter and a first phase control parameter, or a second delay control parameter and a second phase control parameter, based on the optical path difference. The first optical delay line performs first optical path difference delay compensation on the laser beam. The first high-speed phase shifter performs first phase difference delay compensation on the laser beam. The phased array antenna performs second optical path difference delay compensation and second phase difference compensation on the laser beam based on the second delay control parameter and the second phase control parameter. In this embodiment, the delay compensation of the laser beam using the first optical delay line, the first high-speed phase shifter, and the phased array antenna solves the phase jump and wavelength dispersion problems in phased array communication and improves communication capacity.

This application relates to the field of quantum sensing technology and proposes an optically coated alkali metal gas cell structure, comprising: a glass shell, including a first light-transmitting surface, a second light-transmitting surface, a third light-transmitting surface, and a fourth light-transmitting surface; an optical beam splitter, disposed on the first light-transmitting surface, for splitting the incident laser into a first beam and a second beam; a first optical reflective film, disposed on the second light-transmitting surface; a second optical reflective film, disposed on the third light-transmitting surface; and an optical anti-reflection film, disposed on the fourth light-transmitting surface. The first beam, after being reflected by the optical beam splitter, is emitted as monitoring light, and the second beam, after being transmitted through the optical beam splitter, is reflected sequentially by the first and second optical reflective films before emitting light from the fourth light-transmitting surface. By integrating the optical beam splitter, reflective film, and anti-reflection film, the function of a polarizing beam splitter prism is integrated with the alkali metal gas cell, which not only improves the probe integration and reduces the overall volume but also effectively extends the propagation path of the pump light within the gas cell.