218 results about "Optical coefficient" patented technology

Systems and methods for measuring the stress profile of ion-exchanged glass are disclosed, based on the TM and TE guided mode spectra of the optical waveguide formed in the ion-exchanged glass. The method includes digitally defining from the TM and TE guided mode spectra positions of intensity extrema, and calculating respective TM and TE effective refractive indices from these positions. The method also includes calculating TM and TE refractive index profiles nTM(z) and nTE(z) using either an inverse WKB calculation or a fitting process that employs assumed functions for nTM(z) and nTE(z). The method also includes calculating the stress profile S(z)=[nTM(z)−nTE(z)] / SOC, where SOC is a stress optic coefficient for the glass substrate. Systems for performing the method are also disclosed.

A method of noncontact imaging for performing qualitative and quantitative analysis of wounds includes the step of performing structured illumination of surface and subsurface tissue by both diffuse optical tomography and rapid, wide-field quantitative mapping of tissue optical properties within a single measurement platform. Structured illumination of a skin flap is performed to monitor a burn wound, a diabetic ulcer, a decubitis ulcer, a peripheral vascular disease, a skin graft, and / or tissue response to photomodulation. Quantitative imaging of optical properties is performed of superficial (0-5 mm depth) tissues in vivo. The step of quantitative imaging of optical properties of superficial (0-5 mm depth) tissues in vivo comprises pixel-by-pixel demodulating and diffusion-model fitting or model-based analysis of spatial frequency data to extract the local absorption and reduced scattering optical coefficients.

The invention provides an estimation method of a vehicle battery stress optical coefficient (SOC), and belongs to the technical field of vehicle power batteries. The method solves the problems that the conventional estimation method of vehicle battery SOC is not accurate and the like. The estimation method is characterized by comprising the following steps: a, starting; b, judging the shelf time of the battery, if the shelf time is less than a set time T0, performing a step c, otherwise performing a step d; c, taking the SOC of the battery when the battery is not used last time as the SOC at the moment; d, acquiring an SOC by an open-circuit voltage method; e, judging whether the battery is in a dynamic state or not, if the battery is in a dynamic state, performing a step f, otherwise returning to the step b; f, estimating the SOC by an Ah integral method; g, correcting the SOC acquired by estimation; and h, finishing. The method provided by the invention has the advantages that during correction of the SOC, various factors influencing the SOC are taken into full consideration, so the accuracy of SOC can be improved.

A state of health (SOH) value assessment method of a battery pack includes combination of a SOH value assessment step based on battery capacity and a SOH value assessment step based on battery inner resistance or combination of a comprehensive SOH value assessment step based on a battery capacity and a stress optical coefficient (SOC) value and the SOH value assessment step based on battery inner resistance. The invention further provides an effective assessment method for battery health status, which facilitates assessment on performance state and service life of the battery pack. Simultaneously, the assessment method can be integrated in a battery management system so as to perfect functions of the battery management system and facilitate real-time assessment on the battery status by the battery management system.

The invention discloses an SOC (Stress Optical Coefficient) estimation method for power batteries based on a RC (Remote Control) equivalent model, which comprises the following steps: determining an estimation equation based on the RC equivalent model and expanding an estimation method of a Kalman filter. The SOC estimation method has the beneficial effects that the charge states of the power batteries can be accurately estimated, and as SOC values directly reflect the states of the batteries, the maximum discharge current of each battery can be limited, the driving mileage of an electric vehicle can be forecasted; and the performance difference among all the batteries in a battery pack can be identified according to the SOC values of the batteries, and equalizing charging is performed to keep the uniformity of battery performance and finally achieve the purpose of prolonging the service lives of the batteries.

An optical fiber device has at least two cores within the same cladding having different characteristics. The characteristics include including strain optic coefficient, thermo-optic coefficient, thermal expansion coefficient, photo-sensitivity and refractive index. One or more cores can have a Bragg grating.

The invention provides a stress measuring device with higher precision, which can measure the size, direction and distribution of the stress of optical glass. The stress measuring device of the optical glass comprises a communicated light path interferometer and a stander, wherein the stander comprises a frame and a plane scanning test platform arranged on the frame; and a laser receiving unit and a laser emitting unit of the communicated light path interferometer are arranged on the stander, and can synchronously move front and back, and up and down. The stress measuring device achieves the quantitive measurement of the stress size and the stress uniformity of the optical glass; in addition, the precision is greatly improved, the resolution reaches 0.01nm, and the size of the measurable optical glass is greatly widened. The stress measuring device can better measure the stress optical coefficient of the optical glass; and compared with the other polarized stress meter measuring devices with weight application, the measuring precisions of the pressure and the stress of load are obviously improved, and the measuring precision of the stress optical coefficient can reach 0.03*10<-12> / Pa.

The invention relates to the field of optical thin film spectrum test, and in particular relates to a method for accurately calibrating the optical constant of the visible light waveband of an optical thin film. Particularly, the invention provides an optical coefficient measurement method of the visible light waveband of the thin film, and particularly relates to a method for accurately calibrating the optical constant of the visible light waveband of silicon dioxide thin film material; the method is simple and convenient, and is capable of unifying the physical meaning and mathematical meaning of the constant test of the optical thin film. The method has wide application value in the aspect of accurately calibrating the optical constant of the thin film. Particularly, the invention relates to the accurate calibration of the optical constant of the thin film material; on the basis of elliptic polarization spectrum inversion optical constant, the consequences of physical models of the thin film can be arranged by an orthogonal method, the sequence of the application of the physical models of the thin film can be obtained by mathematical statistics, and finally the physical meaning and mathematical meaning of the final given optical constant calculated result are unified.

The present invention provides an acrylic pressure sensitive adhesive composition having an element with a positive stress optical coefficient for a polarizing film and a polarizing film using the same.

Provided is a power control method of a battery management system. The power control method of the battery management system includes the following steps: building a maximum allowable discharge power and temperature, and a two dimensional power meter of a stress optical coefficient (SOC); detecting the temperature and the SOC value under the current working mode of each battery monomer voltage in a battery pack and the battery pack, checking the chart and estimating the current maximum allowable discharge power P of the battery pack according to a linear interpolation method; finding out the battery monomer voltage value with the lowest voltage in the battery pack, setting the maximum allowable target discharge power at the moment according to the battery monomer voltage value; delivering the given maximum allowable target discharge power to the finished vehicle controller which carries out the relevant control.

The invention discloses a charging station power distribution method, a power distribution device and a storage medium. The method includes the steps: acquiring the actual power of a transformer; judging whether the actual power exceeds the rated power of the transformer or not; calculating first power to be reduced when the actual power exceeds the rated power of the transformer; acquiring the SOC (stress optical coefficient) value and charging time T of each charging vehicle according to charging information, and calculating the reduced power of each charging pile in operation according to the SOC value and the charging time T to obtain total reduced power; judging whether the total reduced power is higher than or equal to the first power to be reduced or not; controlling the power of the charging pile in operation to be reduced according to a first preset strategy until the actual power of the transformer is lower than or equal to a preset power threshold. The load of a whole charging station on the transformer is reduced by reducing the power of the charging pile in operation, and damage to the transformer is avoided.

The invention provides an unpolarized interference high-sensitivity photonic crystal fiber temperature sensor which comprises a small section of photonic crystal fiber and single mode fibers which are connected, wherein the photonic crystal fiber is arranged in the middle section and filled with high thermo-optical coefficient liquid, the single mode fibers are arranged at two ends and the high thermo-optical coefficient liquid does not contact with the outside directly; the used photonic crystal fiber comprises a solid core and an air cladding, the high thermo-optical coefficient liquid is sealed in the air cladding of the photonic crystal fiber and has a length between several millimeters and dozens of millimeters. According to the manufacturing method of the unpolarized interference high-sensitivity photonic crystal fiber temperature sensor, common single mode fibers are used for input / output light guide of the fiber temperature sensor, a small section of photonic crystal fiber filled with the high thermo-optical coefficient liquid is welded between the single mode fibers by adopting an arc welding method, the high thermo-optical coefficient liquid is sealed in the photonic crystal fiber and does not contact with the outside. The unpolarized interference high-sensitivity photonic crystal fiber temperature sensor has novel design, is feasible to manufacture, and has a wide application prospect in the fields such as fiber sensing and the like. At present, temperature sensitivity obtained by using isopropanol is 103.7pm / DEG C.

The invention discloses a narrow-band fiber laser for mixed medium whisper gallery mode microcavity full-optical tuning. The fiber laser comprises a semiconductor laser pump source, a wavelength division multiplexer, a gain fiber, a fiber isolator, an optical coupler, a polarization controller and a tapering fiber coupling mixed medium microcavity, wherein the units are connected end to end in a fiber coupling manner to form a fiber resonant cavity in a closed manner. The tapering fiber coupling mixed medium microcavity is taken as a mode selection unit in the fiber resonant cavity, light is coupled into the microcavity through one end of a tapering fiber, total reflection transmission is carried out on each end face to form a whisper gallery resonance mode, and the light is returned to the fiber resonant cavity through the other end of the tapering fiber. The mixed medium microcavity is composed of two or more than two layers of media, namely one or more layers of medium films with high index of refraction, great thermo-optical coefficient and high light transmissivity are wrapped on the inner layer medium surface of the microcavity. The laser has the characteristics of large wavelength coverage full-optical tenability, compact strucutre, good monochromaticity and the like.

The invention provides a battery energy storage system for peak load shifting and a control method thereof. The system comprises M energy storage modules, wherein M energy storage modules are mutually connected in parallel, each energy storage module comprises a battery pack and a bi-directional converter, the direct current end of the bi-directional converter is connected with the battery pack, the alternating current end of the bi-directional converter is connected with a power grid, and M is the integer greater than 1; and a monitoring module, wherein the monitoring module is respectively connected with the battery pack and bi-directional converter in each energy storage module, the monitoring module is used for obtaining the charging and discharging power demand curve and current stress optical coefficients (SOC) of M battery packs, and performing the start and stop control and power distribution to M energy storage modules according to the charging and discharging power demand curve, the current SOC of M battery packs and the power-efficiency curve of each energy storage module. The system is formed by connecting multiple energy storage modules in parallel, so the peak load shifting capacity is enhanced, the stability and safety of the power grid are obviously improved, and the redundancy and applicability of the system are improved.

A waveguide cores consisting of a subwavelength grating permits transmission of light without diffraction in a discontinuous manner, wherein the energy is provided by field hopping between subwavelength material segments of higher index. The use of alternating segments permits design of waveguides having desired effective index, mode confinement factor, birefringence, polarization mode or mode dispersions, polarization dependent loss, thermal sensitivity, or nonlinear optical coefficient. An optical system comprises a waveguide having such a core, clad on at least one side, extending between two ends, and wavelength-limiting optical components in optical communication with the ends.

The utility model discloses a high-sensitivity optical fiber temperature transmitter, which belongs to the technical field of fiber optic sensing, and comprises an aluminum or aluminum alloy pipe or box shell; wherein, a segment of multimode optical fiber is arranged hermetically in the pipe or box shell; the core of the multimode optical fiber with a diameter of 50 to 250 Mu m is made of quartz; the covering of the multimode optical fiber is formed by polyimide with a thermo-optical coefficient of minus one ten-thousandth to minus five ten-thousandth per centidegree; one end of the multimode optical fiber is connected with single model input optical fibers, and the other end is connected with single mode output optical fibers; the single mode input and output optical fibers are bonded with the ports of the pipe or box shell with epoxy resin adhesives. The utility model has the advantages of simple structure, easy manufacture, and convenient use. In addition, the utility model reaches a sensitivity of minus three point nine fifteen per centidegree, which is several times or decades of times than that of the prior wavelength encoding type optical fiber temperature sensor, meanwhile has the same wavelength encoding and division multiplex as the fiber bragg grating (FBG).

A laminated film obtained by carrying out anti-reflection processing on the surface of a reflection polarizing film. This laminated film comprising (A) a monoaxially oriented laminated film consisting of 501 or more alternating first layers made of a first thermoplastic resin having a positive stress optical coefficient and a thickness of 0.05 to 0.5 μm and second layers made of a second thermoplastic resin different from the first thermoplastic resin and having a thickness of 0.05 to 0.5 μm, and a low-reflectance layer formed on at least one side of the monoaxially oriented laminated film and having a reflectance of the surface measured from the input side of 3% or less. This laminated film is characterized in that the average reflectance of a polarization component parallel to the plane including the stretching direction of the monoaxially oriented laminated film and a direction perpendicular to the film plane is 90% or more at a wavelength of 400 to 800 nm, and the average reflectance of a polarization component perpendicular to the plane including the stretching direction and the direction perpendicular to the film plane is 10% or less at a wavelength of 400 to 800 nm, and is used in a reflection type polarizing plate.

The invention discloses a hybrid energy control system and a control method of a solid oxide fuel cell. The control system comprises a signal collector, a state estimator, a controller, a controllableboost DC / DC converter, a bi-directional DC / DC converter and a flux conditioner; the signal collector comprises a sampler used for collecting the voltage, the current and the temperature of a lithiumbattery pack, the load current and the voltage of the controllable boost DC / DC converter, and the state estimator obtains the SOC (stress optical coefficient) of the lithium battery pack according tothe voltage, the current and the temperature of the lithium battery pack; and the controller obtains the load power according to the load current and the output end voltage of the bi-directional DC / DCconverter, the controller determines the working state and electric pile output power of the lithium battery pack according to the load power and the SOC of the lithium battery pack, and outputs thecontrol signals of the bi-directional DC / DC converter and the controllable boost DC / DC converter, and the fuel flux, the air flux and the flux additional control signals of a SOFC (solid oxide fuel cell) electric pile system, and the flux conditioner controls the SOFC electric pile system.

The invention discloses a micro-ring resonant cavity electro-optical modulator based on a graphene / molybdenum disulfide heterojunction. The micro-ring resonant cavity electro-optical modulator comprises a substrate layer, a direct-light waveguide, a micro-ring resonant cavity waveguide and a graphene covering layer. The direct-light waveguide and the micro-ring resonant cavity waveguide are embedded into the substrate layer, and a coupling space is reserved between the direct-light waveguide and the micro-ring resonant cavity waveguide. The upper surface of the micro-ring resonant cavity waveguide is covered with a part of the graphene covering layer. The graphene covering layer comprises a first graphene layer, a second graphene layer, molybdenum disulfide, a first electrode and a second electrode, wherein the first graphene layer and the second graphene layer are isolated by the molybdenum disulfide, the first graphene layer stretches outwards from one side of the micro-ring resonant cavity waveguide and is connected with the first electrode, and the second graphene layer stretches outwards from the other side of the micro-ring resonant cavity waveguide and is connected with the second electrode. The micro-ring resonant cavity electro-optical modulator has extremely low optical loss, a low thermo-optical coefficient, low insertion loss, large environment temperature tolerance, a good modulation depth and a high extinction ratio.

The present invention provides an imaging apparatus which generates, based on a captured image, a depth map of an object with a high degree of precision.A sensor drive unit (12) that shifts an image sensor (11) in an optical axis direction, along with a sensor drive control unit (13), capture images A and C which are focused on a near end side and a far end side of the object, respectively, and an image B by sweeping the image sensor (11) from the near end side to the far end side, an all-in-focus image generation unit (15) generates an all-in-focus image D from the sweep image B, a blur amount calculation unit (16) calculates an amount of blur in each of the partial regions of the images A and B through deconvolution processing in an image of a region corresponding to the all-in-focus image D, and a depth map generation unit (17) generates a distance between the imaging apparatus and the object in each of the image regions, in other words, a depth map, from an amount of blur in regions corresponding to the near end image A and the far end image C and from an optical coefficient value of the imaging apparatus including a focal length of a lens.

Some projection systems use a polarization beamsplitter (PBS) for coupling light to and from an image-forming device. The PBS is typically formed with a reflective polarizing layer disposed between glass covers. Stress birefringence in the glass cover lying between the reflective polarizing layer and the image-forming device can reduce the image contrast of the projection system. A quarter-wave retarding element positioned between the glass cover and the image-forming device is used to compensate for the birefringence, at least in part. This permits the PBS to use glass covers formed of a glass material having a higher stress optic coefficient than before, while still maintaining high image contrast.

The invention discloses a calibration method of a polarization angle and a light incidence angle of an ellipsometer in an ellipse polarization measuring system and belongs to the technical field of optical measuring devices. The calibration method includes fitting by a least square method according to the Fourier coefficient and referring to a relation expression of an optical coefficient of a sample and work parameters of the ellipsometer to acquire calibration values of the work parameters of the ellipsometer. System parameters including polarization directions of a polarizer and an analyzer and the light incidence angle in the ellipsometer can be calibrated by the method, calibration process is simple and accurate, measurement can be achieved directly without adjusting parts of a system after calibration, and accordingly the measurement process is simplified, and precision in measurement is increased.

The invention provides a nonlinear optical material based on a metal nanometer cluster array, wherein the material includes a substrate, the metal nanometer cluster array on the substrate, and a polymer, an oxide or a metal-doped oxide wrapping the array. The material can be prepared by the following method: at first, the nanometer microspheres of polystyrene are dissolved in water to prepare a colloid water solution of the nanometer microspheres of polystyrene; the colloid water solution is coated on the substrate; the water on the substrate coated with the colloid water solution is removed to obtain orderly-arrayed colloid crystal membrane lamina with the nanometer microsphere of polystyrene; metal is deposited on the colloid crystal membrane lamina with the nanometer microsphere of polystyrene to obtain the colloid crystal membrane lamina with deposited metal; and the crystal membrane lamina of the colloid crystal membrane lamina with deposited metal is removed to obtain the substrate with the metal nanometer cluster array. The material has large three-nature optical coefficient and ratio of optimum value and is especially suitable for practical application.

The invention belongs to the technical field of thin film stress optical coefficient measurement, and in particular relates to a method for measuring a stress optical coefficient of an optical thin film. The invention provides a method for measuring the stress optical coefficient of the thin film, especially for testing a stress optical constant of a silicon dioxide thin film material. The method is simple and convenient, so that research of a complicated optical test system is avoided; measurement on the stress optical coefficient of the silicon dioxide thin film material can be realized. particularly, stress and a birefringent characteristic of the thin film are measured, so that the stress optical coefficient of the thin film is calculated by a stress optical rule; the method is quick and convenient; the use of a complicated stress optical coefficient measurement system is avoided, and a new method and way are provided for the measurement of the stress optical coefficient of the thin film material.

The invention discloses a calculation method of a battery pack actual capacity. The calculation method includes the following steps: (1) acquiring the value of the stress optical coefficient (SOC) SOC1 as an initial value when the battery pack just enters a working state. (2) acquiring the value of the stress optical coefficient (SOC) SOC2 as an end value when the battery pack stops working for a long time or enters the working state for the second time.(3) calculating the discharge capacity delta Qin the time quantum between SOC1and SOC 2. (4) calculating the actual capacity of the battery pack= delta Q / (SOC1-SOC2). If delta Q is less than a preset threshold value, then the currently detected data is deleted and the detection is carried out again. The preset threshold value is regulated according to the size of the different battery pack capacity. The calculation method of the battery pack actual capacity has the advantages that the calculation is simple; the realization of the calculation is simple, the actual capacity of the battery pack can be exactly calculated. The initial value and the end value of the calculation all chooses the value of the battery pack after standing so that the calculation can be exact and the calculation value is more close to the true value.

Disclosed is an image capture device that generates a distance map to a photographic subject from a photographic image, with high precision. Three images are photographed with a sensor drive unit (12) and a sensor drive controller unit (13), which move an image sensor (11) in the optical axis direction: photographic images (A, C) that are respectively focused on the near-end side and the far-end side of the photographic subject, and an image (B) that is photographed while sweeping the image sensor from the near-end side to the far-end side. An omnifocal image (D) is generated by an omnifocal image generator unit (15) from the sweep image (B); a blur quantity in each component region of the image (A) and the image (B) is computed by a blur quantity computation unit (16), carrying out a deconvolution process with an image of a region corresponding to the omnifocal image (D); and the distance from the device to the photographic subject in each image region, i.e., a distance map, is generated by a distance map generator unit (17) from the blur quantity of the regions corresponding to the near-end image (A) and the far-end image (C) and optical coefficients of the image capture device, including the focal length of the lens.

Detecting an amount of change in light intensity caused by surface plasmon resonance includes coupling light having transverse magnetic and transverse electric polarization modes into a slab waveguide having a metallic film that supports the surface plasmon resonance, detecting the transverse magnetic and transverse electric polarized light as it emanates from the slab waveguide, and determining an instantaneous difference in intensities between the transverse magnetic and transverse electric polarization modes of the emanated light. A thickness of the metal film may be varied to shift a response curve of the surface plasmon resonance, and the materials of a slab waveguide substrate may be selected to have a thermo-optic coefficient that substantially matches that of a test sample under analysis.

The invention provides a method for optimizing the capacity of an energy storage system in case of the fluctuation of smooth and renewable energy sources electricity generation output, which comprises the steps of: selecting reasonable renewable energy output power sample data before ensuring the capacity of the energy storage system, and sequentially ensuring the power, the capacity and the initial stress optical coefficient (SOC) status of the energy storage system after ensuring the reasonable renewable energy output power sample data. Aiming at overcoming the defect that the existing method for optimizing the capacity of the energy storage system in case of the fluctuation of the smooth and renewable energy sources output can not comprehensively consider all factors and can not reach the practical applicability, the invention provides the method for optimizing the capacity of the energy storage system in case of the fluctuation of the smooth and renewable energy sources electricity generation output based on a frequency spectrum analysis result of renewable energy sources output power. The method can provide the capacity scheme of the energy storage system limited by energy storage system-compensated target power output fluctuation ratio, and the method is practical, simple, quick and easy to realize.