85 results about "Optical reflectance" patented technology

The invention relates to a rice canopy optical and microwave integrated radiation modeling method, which comprises the following steps of: acquiring and uniformly processing rice canopy and environmental parameters, and constructing a same physical parameter system shared by optical and microwave models; the optical part is used for calculating bidirectional reflection factors and optical reflectivity of the rice canopy under different observation conditions based on an aquatic vegetation radiation transmission model; the microwave part is based on a vector radiation transfer equation, adopts a matrix multiplication method to calculate canopy multiple scattering, and simulates underlying surface scattering in combination with an improved integral equation model to obtain a multi-polarization backscattering coefficient; the optical reflectivity and the microwave backscattering coefficient are output under a unified parameter system, and optical and microwave collaborative forward modeling is achieved. According to the invention, a rice canopy optical and microwave integrated collaborative simulation framework is established based on a radiation transfer principle, a physical consistent basis is provided for crop parameter inversion, multi-source remote sensing data application and farmland environment monitoring, and the application prospect is wide.

A housing (185) for an electronic device (170) includes an optical film (100) having an optical transmittance for substantially normally incident light having a band edge separating first and second wavelength ranges, where the first wavelength range extends from about 400 nm to about 700 nm and the second wavelength range is at least about 100 nm wide and disposed between about 800 nm and about 1100 nm. For substantially normally incident light, an average optical reflectance of the optical film is greater than about 90% in the first wavelength range, and an average optical transmittance of the optical film is greater than about 80% in the second wavelength range. For at least one frequency in a range of about 0.1 GHz to about 90 GHz and for substantially normally incident radiation, the optical film transmits at least about 95% of the incident radiation.

The invention relates to a variable-buoyancy low-consumption moving method for an underwater robot, and the method comprises the steps: obtaining water optical reflectivity data and nearshore terrain contour data, and constructing an environment characteristic spectrum through combining a water temperature and salinity change curve of historical hydrological records, seawater flow velocity and flow direction data, and submarine landform data; the environment characteristic spectrum is analyzed, and the underwater robot is placed in water for operation; the method comprises the following steps: acquiring environment structure data, physical field data and motion state data of an underwater robot to form a multi-dimensional data set of the underwater robot; inputting the multi-dimensional data set of the underwater robot into a pre-trained deep belief network model to obtain a scene recognition result; generating a scene decision instruction according to the scene recognition result; a robot motion control model is constructed, and a robot motion path adapting to real-time environment constraints is obtained; and constructing a variable buoyancy energy efficiency evaluation system, and forming full-process closed-loop optimization. The underwater operation efficiency and the energy efficiency can be remarkably improved, and the energy consumption is reduced.

The invention relates to the field of display driving control of input equipment, in particular to an electronic ink screen display control method of a keycap, which comprises the following steps of: firstly, inserting a sensing phase in a key domain, and constructing a state vector containing charge bias estimator, optical reflectance and temperature by utilizing opposite-polarity probe pulse, phase-locked demodulation and temperature measurement; then filtering fusion and sample-based temperature-related response parameter calibration are carried out, a Prantl-Ishlinskii hysteresis model is constructed, an equivalent dose target is obtained through analysis and inversion, and a charge bias target is set to be zero; solving a constraint optimization synthesis zero direct current vector waveform under zero direct current constraint and executing, and injecting a correction phase pair with opposite polarity when a judgment condition is not met; and summarizing execution records to calculate the total equivalent charge amount of the whole board, carrying out blocking and phase staggered scheduling based on optical deviation and charge bias, and carrying out online parameter back-writing. According to the invention, ghosting and flickering are reduced and long-term stability is improved.

To provide a power generation module and a window in which a lead wire is inconspicuous when viewed from the indoor side.SOLUTION: A power generation module according to the present disclosure includes a first substrate having translucency, a transparent second substrate facing the first substrate, a first electrode layer provided on the first substrate, a semiconductor layer stacked on the first electrode layer, a second electrode layer stacked on the semiconductor layer, a lead wire provided on the first electrode layer, and a reflection suppression layer located between the lead wire and the second substrate so as to cover the lead wire in plan view. The optical reflectance of the reflection suppressing layer is lower than the optical reflectance of the lead wire. A window according to the present disclosure includes the power generation module and a fixture for fixing the power generation module to an installation object.SELECTED DRAWING: Figure 2

The invention discloses a portable renewable cooling hydrogel composite material as well as a preparation method and application thereof. The portable renewable cooling hydrogel composite material comprises a three-dimensional network structure, porous solid particles and water, wherein the three-dimensional network structure is formed by cross-linking and curing macromolecules and an ionic cross-linking agent, and the porous solid particles are uniformly distributed in the three-dimensional network structure. The hydrogel composite material disclosed by the invention is beneficial to enhancing the diffuse reflection capability of sunlight, improving the optical reflectivity of the material and further improving the cooling performance, can be coated on a roof or other solid surfaces in situ without complex equipment during preparation, has good light reflectivity and evaporative cooling capability, can effectively reduce the surface temperature under sunlight, and is suitable for being used in the field of solar energy. The indoor cool feeling is kept; and after being dried, the composite material can be regenerated by spraying water, so that the composite material can be repeatedly used. The material is simple and convenient to prepare, low in cost and convenient to carry, and can be widely popularized in the fields of passive refrigeration, evaporative cooling, skin rehabilitation or building heat management and the like.

Optical films, such as reflective polarizer films, and optical systems including the optical films are described. An optical system includes one or more optical lenses having at least one curved major surface, a partial reflector, and a reflective polarizer. For a substantially normally incident light in a predetermined wavelength range extending at least from about 450 nm to about 600 nm: the partial reflector has an average optical reflectance of at least 30%, and the reflective polarizer has an average optical reflectance Rs for a first polarization state, an average optical transmittance Tp for an orthogonal second polarization state, and an average optical reflectance Rp for the second polarization state, where Tp≥80%, Rp≤1%, and 50%≤Rs≤95%.

The invention relates to a method for preparing a metal powder intended for an additive manufacturing process of the type involving the scanning of a powder bed by a near-infrared laser beam, characterized in that it comprises: an initial step for selecting a powder having an optical reflectance higher than 70% for wavelengths ranging between 800 nm and 1500 nm; then a step for treating said powder, which is different from particle grafting, and which causes a physical and / or chemical surface modification of the particles (4) of said powder, such that it is possible to reduce their optical reflectance at a given wavelength. The invention also relates to the use of such a powder, the particles (4) having a median size d50 between 5 pm and 50 pm after treatment.

The invention relates to an arbitrary polyhedron spinning space debris space-based observation light variation curve simulation method. The method comprises the following steps: calculating position vectors of debris and an observation satellite in a geocentric inertial system at the current moment according to orbital elements of the debris and the observation satellite; calculating a sun vector and an observation satellite vector under the debris body system according to the attitude of the debris at the current moment; calculating a sun incident zenith angle and a satellite observation zenith angle of each surface of the debris; calculating the actual effective reflection area of each surface of the fragment; calculating the optical reflectivity of each surface of the fragments based on a BRDF scattering model; calculating the total reflection irradiance of each surface of the fragments; calculating to obtain the apparent magnitude of the fragments at the observation satellite according to an apparent magnitude calculation formula; and on the basis of a preset fragment attitude sequence, repeating the steps to calculate and obtain the light variation curve of the fragments. According to the method, the attitude spinning condition of the debris target is fully considered, and a basis can be provided for designing a space-based debris observation satellite remote sensor and inverting the debris attitude by using the light variation curve.

The application discloses a kind of matrix spraying parameter optimization method and system for mass spectrometry imaging, it is related to deep learning technical field, including: the optical image of the surface of tissue section is collected, is evenly divided into multiple grid units arranged according to row and column, optical reflectivity value is extracted, and optical reflectivity distribution diagram is constituted;Pretreatment is carried out and the hydrophilic-hydrophobic index of each grid unit is calculated;Spraying parameter prediction model outputs nozzle moving speed prediction value;Adjacent grid units in the same row and the difference of nozzle moving speed prediction value are within the preset tolerance range, and the grid units are merged into the same spraying area, the average value of the nozzle moving speed prediction value of all grid units is used as initial optimized nozzle moving speed;Optimized nozzle moving speed is obtained by correction, and the surface of tissue section is differentially sprayed with matrix solution.The technical problem that the present application solves is that the surface of the tissue is different in hydrophilic-hydrophobic, which leads to uneven spraying and low spatial resolution consistency of mass spectrometry imaging.

A mirror system for a side- or rear-view mirror of a vehicle includes a light absorbing layer and an optical film having a plurality of layers disposed on the light absorbing layer. For substantially normally incident light and a blue, green, and red wavelength range extending from about 420-485 nm, 525-575 nm and 625-740 nm, respectively, and for at least one polarization state, the plurality of layers includes a reflection band having a substantially flat top region at least 100 nm wide. The reflection band includes left and right band edges at respective short and long wavelength sides. The plurality of layers has an average optical reflectance R1 of greater than about 70% and a standard of deviation of less than about 5% in the substantially flat top region. An average optical reflectance Rb is less than about 0.8R1 in the blue wavelength range.

An optical construction includes a lens film and a mask layer. The lens film includes an outermost structured first major surface and an opposite outermost substantially planar second major surface. The first major surface includes a plurality of microlenses arranged along orthogonal first and second directions. The mask layer is disposed on the second major surface of the lens film and includes a first layer including a first metal, a second layer including a second metal, and a third layer disposed between the first and second layers. Each of the first and second layers has an optical reflectance greater than about 5% for substantially normally incident light, the third layer has an optical transmittance greater than about 70%, and the mask layer has an optical reflectance less than about 20%. The mask layer defines a plurality of pass-through openings that are in one-to-one alignment with the microlenses.

An embodiment of the present invention provides a soil nutrient spectrum detection and regulation method and system, belonging to the technical field of soil nutrient spectrum detection and regulation. The method includes: collecting soil multispectral raw data and environmental data, generating a calibration matrix and nonlinear correction parameters, performing optical reflectance conversion, and synchronously fusing the time-domain reflectometry dielectric constant and the spectral moisture index to obtain a fused moisture content; selecting a nutrient diagnostic characteristic band pair to obtain a moisture-suppressed spectral index; using a pre-trained transfer learning model to predict soil nutrient content, obtaining a soil nutrient content prediction value, and performing fertilization regulation based on the fertilization decision risk coefficient. The present invention addresses extreme soil moisture measurement deviations through soil type adaptive moisture fusion technology; through multi-source risk quantification decision-making and PID adaptive regulation, it can dynamically optimize fertilizer application and ensure execution safety, forming a precision agriculture closed loop of detection-decision-execution.

Optical films are disclosed that include a plurality of interference layers. Each interference layer reflects or transmits light primarily by optical interference. The total number of the interference layers is less than about 1000. For a substantially normally incident light in a predetermined wavelength range, the plurality of interference layers has an average optical transmittance greater than about 85% for a first polarization state, an average optical reflectance greater than about 80% for an orthogonal second polarization state, and an average optical transmittance less than about 0.2% for the second polarization state.

An optical system includes a display panel, a first mirror, and a second mirror. For a substantially collimated incident light and a visible wavelength range extending from 420 nm to 680 nm, for a first incident angle of less than 10 degrees, the first mirror has an average optical transmittance of greater than 65% for a first polarization state, an average optical reflectance of greater than 80% for an orthogonal second polarization state, and an average optical transmittance of less than 0.1% for the second polarization state, and the second mirror has an average optical reflectance of at least 30% for at least one of the first and second polarization states. For the second polarization state, the average optical transmittance of the first mirror decreases when the incident angle increases from the first incident angle to a second incident angle greater than 20 degrees.

A multilayer optical film includes a plurality of alternating polymeric first and second layers numbering 10 to 120 in total. Each of the first and second layers having an average thickness of less than about 500 nm. The first layers include polyethylene naphthalate, and the second layers include a copolyester comprising at least one of cyclohexane dicarboxylic acid groups, adipic acid groups, or tetramethyl cyclobutanediol groups, such that for substantially normally incident light and for at least one polarization state, the multilayer optical film has an average optical reflectance of at least about 70% in a wavelength range at least about 200 nm wide.

A mirror system for a side- or rear-view mirror of a vehicle includes a light absorbing layer and an optical film having a plurality of layers disposed on the light absorbing layer. For substantially normally incident light and a blue, green, and red wavelength range extending from about 420-485 nm, 525-575 nm and 625-740 nm, respectively, and for at least one polarization state, the plurality of layers includes a reflection band having a substantially flat top region at least 100 nm wide. The reflection band includes left and right band edges at respective short and long wavelength sides. The plurality of layers has an average optical reflectance R1 of greater than about 70% and a standard of deviation of less than about 5% in the substantially flat top region. An average optical reflectance Rb is less than about 0.8R1 in the blue wavelength range.

Optical films, such as reflective polarizer films, and optical systems including the optical films are described. An optical system includes one or more optical lenses having at least one curved major surface, a partial reflector, and a reflective polarizer. For a substantially normally incident light in a predetermined wavelength range extending at least from about 450 nm to about 600 nm: the partial reflector has an average optical reflectance of at least 30%, and the reflective polarizer has an average optical reflectance Rs for a first polarization state, an average optical 10 transmittance Tp for an orthogonal second polarization state, and an average optical reflectance Rp for the second polarization state, where Tp≥80%, Rp≤1%, and 50%≤Rs≤95%.

An optical film includes a plurality of alternating first and second polymeric layers, such that the first polymeric layers have a smaller average in-plane index of refraction than the second polymeric layers and the first polymeric layers have a glass transition temperature of at least 107 deg. C. The optical film may be a reflective polarizer. An optical stack includes a linear absorbing polarizer and the reflective polarizer disposed on, and bonded to, the absorbing polarizer. The reflective polarizer may have an optical reflectance of at least 60% for a first polarization state and an optical transmittance of at least 60% for an orthogonal second polarization state. When heated at 105 deg. C. for 15 minutes, a difference in shrinkage of the reflective polarizer and the absorbing polarizer along the first and second polarization states may be greater than about zero and 0.2%, respectively.

A display system includes visible light emitting first devices configured to emit a first light having at least a first visible wavelength; ultraviolet light emitting second devices configured to emit a second light having at least a second ultraviolet wavelength; a display panel disposed on the first and second devices; and a reflective polarizer disposed between the display panel and the first and second devices, such that the reflective polarizer has, for the visible wavelength, an average optical reflectance of greater than about 50% when an incident light is polarized along an in-plane first direction and an average optical transmittance of greater than about 50% when the incident light is polarized along an in-plane orthogonal second direction; and an optical transmission of greater than about 30% for the at least the second wavelength and for at least one of the first and second polarization states.

The invention discloses a method for measuring the specular reflectance of a tower type solar photo-thermal heliostat. The method comprises the following steps of: mounting a certain number of ultrasonic sensors on a heat absorption tower at a specified position below a heat absorber; measuring optical reflectivity and ultrasonic reflectivity by using a handheld optical reflectivity measuring instrument and an ultrasonic sensor, and constructing a data set; establishing a relationship between the ultrasonic reflectivity and the optical reflectivity; establishing a linear regression model of the relationship between the ultrasonic reflectivity and the optical reflectivity by using the measured data set, and solving a fitting coefficient through a least square method so as to obtain a fitted model; and detecting the heliostat to be measured by using an ultrasonic sensor, substituting the obtained ultrasonic reflectivity into the fitted model, and calculating to obtain the optical reflectivity of the heliostat to be measured. The method disclosed by the invention is simple and convenient to operate and high in measurement speed, reduces the measurement cost of the reflectivity of the heliostat, and does not affect the normal work of a heliostat field.

The invention relates to the technical field of solar cells, in particular to a solar cell, a preparation method thereof and a photovoltaic module. The solar cell comprises a silicon wafer, an N-type doped amorphous silicon layer, a first TCO layer and a second TCO layer which are arranged on a light receiving surface in sequence away from the silicon wafer, and a P-type doped amorphous silicon layer, a third TCO layer, a fourth TCO layer and a first electrode which are arranged on a backlight surface in sequence away from the silicon wafer. The contact resistivity of the first TCO layer and the N-type doped amorphous silicon layer is less than 20 m omega.cm < 2 >, the optical transmittance of the second TCO layer is greater than 92%, and the resistivity is 3.5 * 10 <-4 > omega.cm to 5 * 10 <-4 > omega.cm; the contact resistivity of the third TCO layer and the P-type doped amorphous silicon layer is smaller than 100 m omega.cm < 2 >, and the optical reflectivity of the third TCO layer is larger than 15%. The first electrode is in ohmic contact with the fourth TCO layer, and the contact resistivity of the fourth TCO layer and the first electrode is smaller than 0.4 m omega.cm < 2 >.

A mirror system for a side or rearview mirror of a vehicle includes a light absorbing layer and an optical film having a plurality of layers disposed on the light absorbing layer. For substantially normally incident light and for at least one polarization state, the plurality of layers includes a reflection band having a substantially flat top region that is at least 100 nm wide. The reflection band includes left and right band edges on short and long wavelength sides, respectively. The plurality of layers has an average optical reflectance R1 in the substantially flat top region that is greater than about 70% and a standard deviation that is less than about 5%. In a blue wavelength range extending from about 420 nm to 485 nm, an average optical reflectance Rb is less than about 0.8 R1.

The present disclosure relates to metrology measurement assemblies and related methods. In one or more embodiments, a laser arm assembly includes a laser arm. The laser arm includes a motor mount disposed between a laser end of the laser arm and a second end of the laser arm, the motor mount defining a rotation axis. The laser arm assembly also includes an optical unit connected to the laser end of the arm. The optical unit includes a light source directed toward the rotation axis. The laser arm assembly also includes a weight disposed at the second end of the arm and a motor connected to the motor mount of the arm. The motor includes a brake, a laser motor shaft coaxial with the rotation axis, and an encoder.

A reflective polarizer includes a plurality of first layers disposed on a plurality of polymeric second layers. Each of at least 30% of the first layers includes at least 30% by weight of an inorganic material. For an incident light incident in a plane and a first incident angle, the reflective polarizer and the first layers have respective average optical reflectances R3v and R1v in a visible wavelength range and respective average optical reflectances R3ir and R1ir in an infrared wavelength range, R1v<R3v and (R1ir−R3ir)>10%, when the incident light is polarized along a first direction; and for the visible wavelength range and for a second incident angle, the plurality of polymeric second layers has an average optical reflectance R2v(x) when the plane includes the first direction and an average optical reflectance R2v(y) when the plane includes a second direction, 5%<R2v(y)<R2v(x)<60%.

The invention discloses a hydrophobic self-cleaning anti-reflection coating liquid and a preparation method thereof, and aims to overcome the defects in the aspects of hydrophobicity, weather resistance and environmental friendliness although an existing anti-reflection film technology can reduce the optical reflectivity. Aiming at the problems, the molecular-level synergistic effect among the components is realized through the following innovative combination, so that the limitation of the traditional technology is broken through: through the unique combination and proportion of chitosan, long-chain alkyl silane and perfluorosilane as well as glutamine and ethyl acetate, 'high anti-reflection (llt), which cannot be realized by a single component, is converted into high anti-reflection (llt), high anti-reflection (llt), high anti-reflection (llt), high anti-reflection (llt), high anti-reflection (llt) and high anti-reflection (llt); 2.5%) + super-hydrophobic (gt; and the trinity performance of environmental protection (formaldehyde-free) is realized.

Method for determining a variation of absorption properties of an object (20), between a first instant (t1) and a second instant (t2), the object comprising a surface layer (L1) and a deep layer (L2), the method comprising:a) illumination of the object by a light source (10), emitting an illumination beam (11) forming a zone (12) on the surface of the object;b) detection of photons backscattered by the object, the detected backscattered photons emanating from a detection zone (141, 142, 143), the detection zone being situated at a detection distance from the illumination zone, the detection distance being chosen from among, in ascending order:a first detection distance (d1), forming a first detection zone;a second detection distance (d2), forming a second detection zone;a third detection distance (d3), forming a third detection zone.

The invention relates to the technical field of background simulation, and discloses an outdoor field electromagnetic, infrared and optical multiband background simulation method and system. An intelligent sensor array of the system collects initial environment parameters of a target test area, wherein the initial environment parameters comprise electromagnetic radiation intensity, infrared thermal distribution and optical reflectivity. The background feature extraction module performs multiband feature decomposition on the initial environment parameters according to standard feature databases of grassland, desert and snowfield to generate a background feature vector set containing electromagnetic, infrared and optical band features. The dynamic simulation control module calculates a dynamic adjustment sequence of electromagnetic modulation parameters, infrared emission parameters and optical projection parameters through a multi-objective optimization algorithm based on the feature vector set. And the wave band coupling actuator synchronously drives the electromagnetic wave generator, the infrared radiator and the optical filtering device according to the dynamic adjustment sequence to generate a composite simulation background field matched with the target background type.

A multi-function optical analyzer and method are configured to measure optical properties of materials. In another aspect of the present apparatus and method, a single instrument synergistically measures a refractive index, an extinction coefficient, a thickness, an optical reflectance, and an optical transmittance of a thin film. An aspect of the present optical analyzer apparatus and method transmit light along multiple offset-angled paths to a sample, and reflect the light along multiple offset-angled paths from the specimen to a spectrometer detector. Still another aspect of the present apparatus and method primarily measure a reflectance spectra of an s-wave at oblique angles and non-polarized light at a normal incident angle. This combines the functions of two instruments—an ellipsometer and a spectrophotometer.

An optical system includes a partial reflector having an average optical reflectance of at least 30% in a plurality of wavelengths, an image source disposed to emit image light toward the partial reflector, and a reflective polarizer disposed proximate the partial reflector. The reflective polarizer is curved about two orthogonal axes and can include at least one layer substantially optically uniaxial at at least one location. The image light may be transmitted by the reflective polarizer after it is first reflected by the reflective polarizer. Substantially any chief light ray 10 having at least first and second wavelengths at least 150 nm apart in the plurality of wavelengths and emitted by the image source and transmitted by a stop surface or exit pupil of the optical system has a color separation distance of less than 1.5 percent of a field of view.