567 results about "Spectral absorption" patented technology

The image forming apparatus, comprises: a plurality of ejection heads which eject liquid containing, a first ultraviolet curing initiator having spectral absorption characteristics at least in a first wavelength range, a second ultraviolet curing initiator which has spectral absorption characteristics at least in a second wavelength range being on a shorter wavelength side from the first wavelength range and has no spectral absorption characteristics in the first wavelength range, an ultraviolet-polymerizable compound, and a coloring material, onto a medium; a semi-curing device which radiates, at least once, ultraviolet light having at least a wavelength which is in the first wavelength range and which is on a longer wavelength side from the second wavelength range, onto dots formed by the liquid ejected from the ejection heads onto the medium; an intermediate processing device which performs intermediate processing of an image formed on the medium by the dots; and a main curing device which radiates ultraviolet light having at least a wavelength in the second wavelength range, onto the image which has undergone intermediate processing by the intermediate processing device.

Target analytes present in low concentration as components in a gaseous admixture can be detected using a cavity enhanced optical spectrometer by a process comprising: i) identifying from the spectrum of the pure target analyte a series of absorption peaks free from spectral interference by peaks of any additional gaseous species which are present, the first member of the series being the strongest spectral absorption peak of said target analyte ii) identifying one or more successive peaks of the series which have an absorption that is weaker than the immediately previously identified peak of the series, iii) performing a spectral scan at the wavelengths of the peaks identified in steps i) and ii), and iv) calculating the concentration of the target analyte from the spectral scan of the admixture performed at the wavelength determined in step iii).

A print media (200) comprises paper or other substrate, on which image content, whether text or images are printed with accompanying hidden data (220). The image content is printed with one or more normal printing process visible colorants (340), while the hidden data (220) is printed with spectral edge markers (320). The spectral edge marker materials (320) have a substantial spectral absorption just outside the human visible spectrum, and only slight visible absorption, which is masked by the visible colorants (340). Although the hidden data is nominally visually imperceptible, an image capture device (250) having a visible spectral response that extends into a spectral region just outside the visible spectrum where the spectral edge marker absorption occurs, can then detect the hidden data.

A system for detecting visibly hidden content on a print media (200) in which image content is printed with one or more normal printing process visible colorants (340), and which further includes embedded hidden data (220) printed with spectral edge markers (320). These spectral edge marker materials (320) have a substantial spectral absorption just outside the human visible spectrum, either at the UV edge or IR edge, but only slight visible absorption which is masked by the visible colorants (340). Although the hidden data is nominally visually imperceptible, an image capture device (250) having a visible spectral response from at least one spectrally distinct color imaging channel that extends into a spectral region just outside the visible spectrum where the spectral edge marker absorption occurs, can then detect the hidden data.

The invention relates to a laser gas analyzer and a calibration method; wherein, the laser gas analyzer comprises a light source radiation unit used for generating semiconductor laser beams, a spectroscopy unit which respectively transmits the generated laser beams to a reference cell which is internally encapsulated by zero gas and gas to be measured with known consistency and a measurement cell where the gas to be measured is pumped into during the measurement process and the zero gas and end gas are respectively pump into during the calibration process, a reference detector which is used for obtaining the energy intensity of the laser beam which passes through the reference cell and positioning the absorption peak wavelength of the gas spectrum, and a measurement detector which is used for measuring the energy intensity of the laser beam which passes through the measurement cell and determining the gas consistency during the measurement process; and the calibration method combines the energy signals of the laser beams obtained by the two detectors with a specific arithmetic to carry out zero calibration and end calibration on the instrument. The laser gas analyzer has the advantages of wide application range, simple calibration operation process, saving time, reducing the production cost and usage cost and the like owning to the characteristics of sealed laser passage and multi-optical passages.

A fast and rigorous multivariate curve resolution (MCR) algorithm is applied to remotely sensed spectral data. The algorithm is applicable in the solar-reflective spectral region, comprising the visible to the shortwave infrared (ranging from approximately 0.4 to 2.5 μm), midwave infrared, and thermal emission spectral region, comprising the thermal infrared (ranging from approximately 8 to 15 μm). For example, employing minimal a priori knowledge, notably non-negativity constraints on the extracted endmember profiles and a constant abundance constraint for the atmospheric upwelling component, MCR can be used to successfully compensate thermal infrared hyperspectral images for atmospheric upwelling and, thereby, transmittance effects. Further, MCR can accurately estimate the relative spectral absorption coefficients and thermal contrast distribution of a gas plume component near the minimum detectable quantity.

A spectral imager includes an elongate light propagation medium that receives light at one end, has graded average spectral absorption properties in the elongate direction, and spectral detectors distributed in the elongate direction. The spectral absorption properties of the medium can be graded in both elongate and transverse directions. Both linear and two-dimensional arrays can be formed, enabling simultaneous hyperspectral detection.

Enhanced light absorption of solar cells and photodetectors by diffraction is described. Triangular, rectangular, and blazed subwavelength periodic structures are shown to improve performance of solar cells. Surface reflection can be tailored for either broadband, or narrow-band spectral absorption. Enhanced absorption is achieved by efficient optical coupling into obliquely propagating transmitted diffraction orders. Subwavelength one-dimensional structures are designed for polarization-dependent, wavelength-selective absorption in solar cells and photodetectors, while two-dimensional structures are designed for polarization-independent, wavelength-selective absorption therein. Suitable one and two-dimensional subwavelength periodic structures can also be designed for broadband spectral absorption in solar cells and photodetectors. If reactive ion etching (RIE) processes are used to form the grating, RIE-induced surface damage in subwavelength structures can be repaired by forming junctions using ion implantation methods. RIE-induced surface damage can also be removed by post RIE wet-chemical etching treatments.

The invention provides an organic dye which uses five-membered heterocyclic ring, derivatives thereof and a dye-sensitized solar cell prepared by the organic dye. The dye uses the five-membered heterocyclic ring or the derivatives thereof as a Pi unit, uses substituted triarylamine as an electron donor, uses cyanoacetic acid structure as an electron acceptor, and belongs to molecule of D-Pi-A structure. The dye molecule belongs to pure organic compounds, the structure of the materials is simple and is easy to be obtained; expensive materials of metal of Ru and purifying agent of polydextrose do not need to use, the compound yield is higher, so the total yield is between 40 percent and 70 percent; besides, the performance of spectral absorption and molar extinction coefficient and the like of the dye are excellent; and the peak value of the spectral absorption is over 550nm at the most, the molar extinction coefficient is over 48000M<-1>cm<-1>, the peak value and the coefficient are more than the Ru dye, therefore, the dye has wider absorption range to the sunlight. The dye-sensitized solar cell prepared by the organic dye has the maximum of quantum conversion efficiency of 97 percent and the highest photoelectric conversion efficiency of more than 8.0 percent.

According to one aspect, the invention relates to an asymmetric MIM type absorbent nanometric structure (1, 1′) intended to receive a wide-band incident light wave the absorption of which is to be optimised within a given spectral band, comprising an absorbent dielectric layer (10) in said spectral band, of subwavelength thickness, arranged between a metal array (11) of subwavelength period and a metal reflector (12). The elements (110, 120) forming the metal array exhibit at least one dimension (w) suitable for forming a plasmonic resonator between the metal array and the metal reflector, under the elements of the array, which plasmonic resonator forms a Fabry-Pérot type longitudinal cavity resonating at a first wavelength of the aimed-for spectral absorption band, and the absorber layer exhibits, between the metal array and the metal reflector, at least one first thickness (ta) suitable for forming at least one first Fabry-Pérot type vertical cavity, resonating at a second wavelength of the aimed-for absorption spectral band.

The up-conversion fluorescent powder is prepared by adopting a liquid-phase co-precipitation method and a thermal reaction method, and the up-conversion fluorescent material film is deposited by using a suspension coating film method or metal organic chemical vapor deposition. By adjusting the doping amount of Yb, Er, Tm and other rare-earth elements, the up-conversion fluorescent material can absorb near-infrared light with the wavelength between 800 and 2,000nm and emit visible light, and also can absorb ultraviolet light with the wavelength between 200 and 350nm and emit the visible light. The up-conversion fluorescent material film is applied to silicon-based thin-film solar cells, and the spectral absorption range of the silicon-based thin-film solar cells is widened. The silicon-based thin-film solar cells have the maximum photoelectric conversion efficiency in the visible light range, so the photoelectric conversion efficiency and the stability of the silicon-based thin-film solar cells can be improved by applying the up-conversion fluorescent material.

In an optical frequency comb generator the emission frequency of each one of the set of output lasers is repetitively aligned with an associated one of a set of specifically determined frequencies by comparison of that emission frequency with a frequency indicated by an optical frequency meter. The optical frequency meter is repetitively re-calibrated by reference to the emission frequency of each of at least two frequency tuneable calibration lasers emitting at respectively different frequencies. Each of the calibration lasers has its emission frequency continuously or repetitively aligned with the frequency of an associated spectral absorption line frequency standard.

The invention relates to a high temperature semitransparent material spectrum direction apparent emissivity inversion measuring device and method, belongs to the technical field of high temperature physical function material hot measurement and aims to solve the problems of low accuracy, low temperature upper limit, narrow measuring waveband and existence of dead measuring angle in the conventional semitransparent material spectrum direction apparent emissivity measurement. According to the invention, a fourier infrared spectrometer is used for measuring the high temperature normal direction transmissivity and the high temperature normal direction emissivity of a semitransparent material respectively, further the spectral refractivity and the spectral absorption factor of the semitransparent material are computed according to a radiation transfer inverse problem solving method, and finally the high temperature spectrum direction apparent emissivity of the semitransparent material is computed through the spectral refractivity and the spectral absorption factor of the material. The invention provides a method capable of accurately measuring the spectrum direction apparent emissivity of the semitransparent material, and can be widely applied to various fields of aviation, military, energy sources, chemical engineering and atmospheric sciences and the like.

The invention discloses a method for simultaneously measuring distribution of a high-temperature gas two-dimensional transient temperature field and concentration field based on a hyper spectrum, and belongs to the technical field of laser absorption spectrums. The method comprises the steps that a laser array is distributed on a high temperature area to be measured, hyper spectrum scanning is carried out on the area to be measured, an area temperature field and a vapor concentration field are measured through the spectral absorption of vapor characteristic spectral lines, and meanwhile the distribution of a gas concentration field is measured through the characteristic spectrum absorption of other gas. Grid scattering is carried out on the area to be measured in measurement, laser beams are distributed on the rows and columns of a grid respectively, broadband spectrum scanning is carried out on the characteristic spectral line of gas to be measured, and the inversion of the temperature field and the gas composition concentration field is achieved through a spectrum absorption rate obtained through the scanning with the help of an intelligent optimization algorithm.

The invention discloses a preparation method and application of self-floating high-efficiency photothermal conversion seawater desalination material, and belongs to seawater desalination materials. Ablack body absorption material with a high-efficiency photothermal conversion function and a composite nano structure grows in a three-dimensional network structure by using a chemical method, such asnickel black, eriochrome black, transition metal iron / defective iron oxide, copper / defective copper oxide compound and cobalt / defective cobalt oxide compound. Base foamed nickel in the high-efficiency photothermal conversion seawater desalination material has a hydrophobic property and good mechanical strength, and the capillary action of mutually connected pore structures of the base foamed nickel is used for continuously transporting moisture and reducing the evaporation potential barrier; the photothermal material has a wide spectral absorption function, and has self-floating performance and low thermal conductivity simultaneously, so that the generation of local high temperature is facilitated, the evaporation of water is promoted, a large loss of thermal energy is prevented, and the generation efficiency of water vapor is high.

The invention belongs to the field of photocatalysis and relates to a nano ZnO microsphere / graphene photocatalyst and a preparation method of the nano ZnO microsphere / graphene photocatalyst. The photocatalyst disclosed by the invention is a nano composite photocatalyst formed by wrapping the surface of a nano ZnO microsphere with graphene. The photocatalyst is characterized in that the nano ZnO microsphere is prepared by a solution backflow method, is waxberry-shaped and consists of small crystals with hexagonal wurtzite structures, and the diameter of the nano ZnO microsphere is about 100-400nm. The nano ZnO microsphere / graphene photocatalyst is prepared by vacuum freeze-drying, thermal reducing and the like, and the process is simple and feasible. By virtue of the introduction of the graphene, the adsorption to organic molecules is enhanced, the spectral absorption range is expanded, and effective separation and transmission of photoproduction electron-hole pairs are promoted, so that ZnO / graphene achieves high photocatalysis efficiency in a methylene blue photocatalysis degrading process. According to the method, the steps are simple, and the cost is low; the obtained ZnO microsphere / graphene photocatalyst is high in catalytic activity, has a good photocatalysis effect and is desired to be applied to photocatalysis treatment on industrial pollutants.

An emitter (F) for incandescent light sources, in particular a filament, capable of being brought to incandescence by the passage of electric current is obtained in such a way as to have a value of spectral absorption α that is high in the visible region of the spectrum and low in the infrared region of the spectrum, said absorption α being defined as α=1−ρ−T, where ρ is the spectral reflectance and T is the spectral transmittance of the emitter.

A method for achieving measurable sample heating in the vicinity of a probe microscope tip using Stimulated Raman Spectroscopy. Two laser sources, preferably in the UV visible or near IR illuminate the sample, preferably in overlapping diffraction limited spots. At least one of the sources is swept through a frequency range such that the difference frequency corresponds to IR spectral regions of interest. Selective Absorption by differing sample materials at the difference frequency causes measurable sample heating detectable by the probe tip related to IR spectral absorption bands. Thus very high spatial resolution IR spectroscopy may be achieved.

The invention belongs to the technical field of organic optoelectronic materials, and particularly relates to an A-D-A type conjugated molecule based on dibenzo pentabasic fused heterocycle and a preparation method and application of the A-D-A type conjugated molecule. The dibenzo pentabasic fused heterocycle is adopted as a core, pentabasic fused heterocycle is adopted as a bridge joint unit, and the tail end is connected with the A-D-A type conjugated molecule of an electron-deficient unit. The A-D-A type conjugated molecule based on the dibenzo pentabasic fused heterocycle and the preparation method and application of the A-D-A type conjugated molecule have the advantages that preparation is novel, operation is easy, and product separation and purification are easy. In addition, the A-D-A type conjugated molecule based on the dibenzo pentabasic fused heterocycle has good solubleness and stability, has a wide spectral absorption range and a proper level structure and is expected to be used as a donor or acceptor material of an organic solar cell.

The invention discloses a multi-point on-line detection device for coal mine gas based on spectral absorption, and relates to a coal mine gas detection device, in particular to a multi-point on-line CH4 concentration monitoring device based on a characteristic absorption line of methane (CH4) near a near infrared band 1653nm. The device comprises a D / A conversion module, a DFB laser, a 1*N optical splitter, an open air chamber group, a reference air chamber, a photodetector group, a preamplifier group, an electronic switch, a band-pass filtering circuit, a first phase-locked amplification circuit, a second phase-locked amplification circuit, a first A / D conversion module, a second A / D conversion module, a first DDS, a second DDS, a third DDS, an MCU, a display, a serial port, and a computer. Compared with the prior methane gas monitoring device, the device has the advantages of higher sensitivity, higher gas identification ability, quick response ability, extremely strong anti-jamming ability, easy network formation, and so on, so the device is a gas monitoring device which is most suitable to be used underground at present.

A gaseous target analyte present as a minor constituent in an admixture with at least one other gaseous species can be detected using a cavity enhanced optical spectrometer by a process comprising the steps of: i) identifying a plurality of strong spectral absorption peaks of the target analyte which are present within the scanning range of the spectrometer, ii) determining for the identified peaks the pressure region above which the peak width increases substantially with increasing pressure and below which the peak width is substantially independent of pressure, iii) determining which of the peaks identified in step i) are, within the pressure region determined in step ii), free from spectral interference by any of the other components of the admixture. iv) measuring the spectrum of the admixture at the pressure region identified in step ii).

The invention belongs to the technical field of electric-power equipment detection, and in particular, relates to a detection device of dissolved gases in transformer oil based on infrared spectrum absorption. The device includes a light source system unit, a sensing arrangement unit and a detection acquisition and analysis unit; the light source system unit is composed of a high-power supercontinuum broadband light source, a light source controller and a photoswitch and is used for realizing output multiplexing control of the light source; the sensing arrangement unit is formed by arranging one sensing path of fiber Bragg grating hydrogen sensor series-connection wavelength division multiplexing and the other one sensing path of hollow photonic crystal optical fiber internal spectrum absorption sensing in a cavity body of an oil-immersed power transformer; the detection acquisition and analysis unit is composed of a wavelength demodulation device, a light intensity detector and a data acquisition and analysis device, the wavelength offset and the spectral absorption intensity of fiber Bragg grating hydrogen sensors are detected, and the data acquisition and analysis device records data and types and contents of corresponding fault gases are obtained by calculation; and on the basis, insulation conditions of the transformer oil are evaluated, positioned, analyzed and forecasted.

An apparatus and method for simultaneous detection of N gas species through laser radiation attenuation techniques is disclosed. Each of the N species has a spectral absorption band. N laser sources operate at a wavelength λN in a spectral absorption band separated by the cutoff wavelength for single-mode transmission. Each laser source corresponds to a gas species and transmits radiation through an optical fiber constructed and arranged to provide single-mode transmission with minimal power loss.

The invention relates to a reversible solid photochromic fluorescence ink material and application thereof, belonging to the technical field of photochromic materials. The particular molecular structure uses aromatic ring or fragrant heterocyclic ring substituent group and spiropyrane as basic structural units, the structural formula is disclosed in the specification, and the material is novel fluorescent dyes synthesized by esterification reaction. The research detects that the dyes have different spectral absorption and (or) fluorescence dual color variations before and after the ultraviolet irradiation; the absorption and fluorescence color variations caused by the ultraviolet light can reversibly recover under certain temperature heating conditions to the absorption and fluorescence color before the ultraviolet irradiation; and thus, the material has excellent stability, reversibility and fatigue resistance. The ink material can be used independently, or compounded with a polymer, ink or the like to be used as a photochromic material. The ink material is applicable to the fields of safety forgery prevention, safety inks, display devices, fluorescent transduction, information storage and the like.

The invention discloses a spectral absorption type gas-surveying gas chamber. The top of a first micro closed cavity is provided with a first gas outlet, the top of a second micro closed cavity is provided with a second gas outlet, and the first gas outlet and the second gas outlet are connected with a micro vacuum pump; monomode optical fiber and first segment hollow-core optical fiber are connected in the first micro closed cavity, and multimode optical fiber and second segment hollow-core optical fiber are connected in the second micro closed cavity; the first segment hollow-core optical fiber is connected with the second segment hollow-core optical fiber; and a detection light source enters the first segment hollow-core optical fiber by the monomode optical fiber and then enters the multimode optical fiber by the second segment hollow-core optical fiber, and is outputted to a photo detector by the multimode optical fiber. The invention provides a gas chamber for measuring spectral absorption type gas. The gas chamber has the advantages of small volume, easy bending and high coupling efficiency, and optical length absorption of the gas can be increased by increasing the length of the optical fiber; moreover, the diffusion speed and escape speed of the environmental gas in a gas cavity can be improved.

The invention discloses a MoSe2 nanosheet composite fireworks-shaped TiO2 nanorod array including a TiO2 nanorod array and MoSe2 nanosheets; the MoSe2 nanosheets are evenly and distributed on the surface of the TiO2 nanorod array in quantity and have good composite on the surface of the array; the TiO2 nanorod array is formed by self-assembling TiO2 nanorods. The invention also discloses a preparation method of the MoSe2 nanosheet composite fireworks-shaped TiO2 nanorod array; the MoSe2 nanosheets are evenly grown on the fireworks-shaped TiO2 nanorod array by a two-step solvothermal method, and the material with good composite morphology is obtained. The prepared semiconductor material has the advantages of increased spectral absorption range and specific surface area, reduced current carrier composite rate, and good photocatalytic degradation performance, and has great application potential in the field of photocatalytic degradation. The preparation method has the advantages of simple operation, high yield, low preparation cost and the like.

The invention discloses a surface-plasmon-polariton spectral absorption device based on a periodic chirp structure. The surface-plasmon-polariton spectral absorption device comprises a substrate, a first metal layer and a plurality of gratings, wherein the first metal layer is positioned on the substrate; the plurality of gratings are positioned on the first metal layer; each grating comprises an insulator body positioned on the first metal layer and a second metal layer positioned on the insulator body; and the gratings are in linear chrip at least along the X direction or Z direction or along the two directions simultaneously. The surface-plasmon-polariton spectral absorption device disclosed by the invention has the advantages that since the period of the gratings adopts the linear chrip, the resonant wavelength is in linear distribution and covers larger spectral range, and the bandwidth of the whole forbidden band is realized and widened by properly adjusting a chrip coefficient of the gratings and a resonant cavity formed by an upper metal layer / insulator layer / lower metal layer, so that the possibility for realizing a low and flat reflecting forbidden belt is realized; and under the limiting condition of phase matching and sub-wavelength size, nearly-perfect absorption of the bandwidth can be realized by proper design.

The invention discloses a theoretical method for screening a high-efficiency perovskite sensitizer. The method comprises the following steps: structurally optimizing a perovskite model on the basis of a first principle, and performing electronic and spectral characteristic calculation; analyzing a stable structure to obtain a lattice constant and bond length and bond angle characteristics; performing electronic and spectral characteristic calculation on perovskite by virtue of VASP (Vienna Ab-initio Simulation Package) software, drawing a charge density map, a state density map, an energy band structure chart and a spectrum chart by virtue of software such as VESTA and Origin, and analyzing the forbidden bandwidth of perovskite, an electron orbit transition rule, a crystal binding type, frontier orbit compositions and light absorption characteristics by virtue of a valence bond theory and an energy band theory; screening the high-efficiency perovskite sensitizer by comparing spectral absorption characteristics. According to the theoretical method for researching an internal mechanism of perovskite and screening the high-efficiency perovskite sensitizer, a direct theoretical guide is provided for the design of a perovskite solar cell, the research and development cycle of the cell is shortened, and research and development cost is lowered.

The invention discloses a stable compact type laser-transceiving integrated detection light path structure. The stable compact type laser-transceiving integrated detection light path structure comprises a laser transceiving device and a pyramid reflector device, wherein laser output by a host laser of a monitor is coupled by an external transmission optical fiber flange, so as to enter a tail fiber in a covering cylinder, the laser is conducted to a laser alignment mirror by the tail fiber, the laser is emitted from a receiving mirror in a center opening after being aligned, passes through a sealing window mirror and a target gas detection area and then arrives at an opposite pyramid reflector of the pyramid reflector device, so as to form a reflected light beam and return along the direction of a main light path, the extended return light beam is received and laterally reflected and focused by the receiving mirror, so as to arrive at a receiving lens and a detector which is used for detecting an optical signal of a receiving spectrum, and an electrical signal output by the detector is transmitted to an output interface by virtue of a connecting wire and then transmitted to a host by virtue of an external cable. According to the stable compact type laser-transceiving integrated detection light path structure, a spectral absorption optical path is doubled, the detection precision can be increased, the application range can be extended, and the anti-vibration performance is obviously improved.