125 results about "Molecular absorption" patented technology

A lidar system capable of remotely identifying calibrated absolute aerosol backscatter coefficients of atmospheric aerosol particles by transmitting a beam of light and spectrally separating the intensity of Rayleigh and Mie backscattering is disclosed. The transmitter features high pulse energy to generate sufficient Rayleigh backscattering, enabling atmospheric scanning in a timely manner. The transmitter employs a seeded Nd:YAG laser and a seeded stimulated Raman scattering wavelength shifter to achieve narrow bandwidth, eye-safe laser pulses. The receiver employs a telescope, collimating lens, beam splitter, molecular absorption filter, focusing lenses, and avalanche photodiodes. Mie backscattering is blocked by the molecular absorption filter to provide a Rayleigh signal, which is used with knowledge of atmospheric density to calibrate the Mie signal. The system is intended for atmospheric research and aerosol monitoring applications where calibrated Mie scattering intensity is necessary to measure the optical depths of aerosol structures such as plumes, clouds, and layers.

The invention relates to the manufacture field of absorptive sanitary articles and automatic production equipment and discloses an absorptive core. The absorptive core comprises an absorptive core surface layer, an absorptive core middle layer and an absorptive core bottom layer, wherein the tightness degrees of the absorptive core middle layer and the absorptive core bottom layer are larger than the tightness degree of the absorptive core surface layer. The invention further discloses absorptive core molding equipment and an absorptive core manufacture method. The gathering degrees of fluff pulp fibers in the surface layer, the middle layer and the bottom layer of the absorptive core are from relative looseness to compactness, and the gradient density design can rapidly absorb body fluid, is favorable to fluid permeation and effectively reduces the possibility that the body fluid leaks from the absorptive sanitary articles. When the absorptive core of the structure is manufactured, a molding screen is effectively prevented from being blocked by high molecular absorption resin granules, time and cost which are spent on cleaning and maintaining the molding screen are saved, and the production efficiency of the absorptive core molding device is further improved.

A method and apparatus for measuring target gas concentrations in an atmosphere. The method and apparatus emit in the atmosphere a laser beam tuned to a molecular absorption line of a target gas, receive a reflected signal affected by gas absorption of the target gas in the atmosphere, divide and direct the received signal into a first optical path and a second optical path including in one of the paths a correlation gas cell filled with a predetermined concentration of the target gas, detect transmitted signals through the first optical path and the second optical path, and calculate a target gas concentration by comparing a first signal transmitted through the first optical path to a second signal transmitted through the second optical path. The apparatus includes a laser source tunable to a specific molecular absorption line of a target gas and configured to emit in the atmosphere a laser beam having a spectral bandwidth greater than a full width of the molecular absorption line of the target gas, a receiver configured to receive a reflected signal affected by gas absorption of the target gas in the atmosphere, and at least one detector configured to detect transmitted signals through the first optical path and the second optical path.

The invention relates to a treatment method of mixed electroplating wastewater, and is characterized in that: organic compounds in the mixed electroplating wastewater are decomposed for a plurality of times through decomposition and reduction reaction, internal electrolytic reduction reaction, neutralization and precipitation, compound absorption, etc., and the decomposition process comprises intensified demulsification, electric field flocculation, hydroxyl group decomposition, molecular absorption and ion exchange; heavy metals are reduced for a plurality of times: ferrous ion reduction, hydrogen reduction and neutralized and precipitated. The treatment devices of the method of the invention are simple and can be easily obtained, the operation is simple and convenient, the land occupancy is small and the construction investment is small. The treatment agent is prepared from normal materials and devices, and the treatment expense can be saved by 30 to 50 percent compared with traditional methods. The invention can be used for treating mixed electroplating wastewater with coexisted copper, nickel, zinc, chromium and COD Cr, with a removal rate generally higher than 96 percent. The treatment method of the invention has the advantages of simplicity, short process, small investment, low running expense, high removal efficiency, good treatment effect, and wide popularization value, being bound to have remarkable social and economic benefits.

The present invention provides a method and an apparatus for measuring a light absorption spectra which can remove a noise included in a measurement signal, and achieve a high sensitivity of a laser spectral in a good S/N ratio. According to the present invention, there is provided a method for measuring a light absorption spectra comprising the steps of: (i) conducting a Fourier transform of an absorption spectra measured by using a laser beam source; (ii) disassembling in a Fourier space the Fourier transformed signal into a signal resulted from a periodic vibration component and a signal resulted from a molecular absorption spectra; (iii) removing the Fourier component resulted from said periodic vibration component in a Fourier space; and (iv) conducting an inverse Fourier transform on the signal from which said periodic vibration component is removed, whereby reproducing an absorption spectra in a real space.

The invention discloses a method for quickly detecting hypermanganate index in water by molecular absorption spectrometry. The method comprises the following steps: selecting a color comparison tube to extract a water sample, adding proper sulfuric acid to ensure the water sample is of acidity; adding 0.01 to 0.2umol/L of hypermanganate solution, and heating for 30 minutes in a heat reactor at 100 DEG C; cooling, reducing the residual hypermanganate with nitrite, and adding excessive nitrite to react 3 to 5 minutes; putting 1ml of the reaction solution after constant volume in a 25ml color comparison tube; adding citric acid-ethanol solution, and converting the nitrite into nitrogen dioxide instantly; and carrying gas-phase molecules to an absorption tube by carrier gas, and detecting the light absorption value at the position of 213.9 nano-wavelength. The invention establishes a quick quantitative analysis method for the hypermanganate index in the water by an indirect nitrite detection mode, has the characteristics of quick detection, high accuracy, less turbidity influence, little reagent and safety and environmental protection, and can be widely applied to emergency, online detection, flowing injection, lab information management and the like.

The invention discloses a noninvasive blood glucose measurement device and method. The device mainly comprises a central processing unit and an infrared blood glucose measurement unit. Infrared signals, penetrating a detection part or reflected by the detection part, in wavelength insensitive to blood glucose value variation and infrared signals in wavelength low in glucose molecular absorption and weak in water molecular interference are converted into voltage signals, and the voltage signals are subjected to signal data processing to calculate a blood glucose value, so that influences of background interference signals can be effectively inhibited, measured data instability caused by a near-infrared light absorption effect of water molecules is eliminated, and precision in noninvasive blood glucose measurement is improved. By fusion of the blood glucose values measured according to an infrared transmission method, an infrared reflection method and an energy conservation method, the final blood glucose value is obtained finally, complementation of the three measurement methods is realized, and precision in blood glucose measurement is further improved.

The invention relates to fluoro-boron diisoindole compounds and a preparation method thereof. Compared with the conventional fluoro-boron dipyrrole compounds, according to the fluoro-boron diisoindole compounds, pyrrole rings are directly replaced by isoindole rings, the conjugated range of pi bonds in a parent molecule is increased and thus the photochemical and physical properties of the compounds are changed, molecular absorption and emission wavelengths cause a 'red shift', the maximum ultraviolet absorption wavelength can reach 640nm-680nm and the maximum fluorescence emission wavelength is up to 670nm-713nm and the fluoro-boron diisoindole compounds are near-infrared fluorescent dyes.

The invention provides a device and a method for measuring engine combustion flow field speed based on molecular absorption spectrum. The measuring device comprises a laser setting unit, a laser beam-splitting unit, a measuring unit, a data acquiring system and a data processing unit, wherein the laser beam-splitting unit and the laser setting unit are connected and positioned at one side of an engine combustion flow field; the measuring unit comprises two laser detectors which are positioned at the other side of the engine combustion flow field and opposite to the laser beam-splitting unit; the data processing unit is used for processing data stored in the data acquiring system to obtain the fuel flow field speed. Based on the molecular absorption spectrum, a laser decaying pulse signal caused by fuel gas component concentration changes is used as a cross-correlation analysis random signal to realize cross-correlation speed measurement, so that the device and the method for measuring engine combustion flow field speed based on molecular absorption spectrum provided by the invention can obtain relevant data by only needing to enable laser to pass through a to-be-tested combustion flow field. The device has the advantages of a simple structure, a non-contact type and high sensitivity.

The invention discloses a novel method for measuring the absorption coefficient of atmospheric aerosol with a light-heat method. Based on the characteristics that light and particles interact with each other, a heat effect is generated when the light is absorbed by the particles and heat is not generated when the light is scattered by the particles, the light of a wavelength is transmitted in a heat-insulation glass pipe filled with the aerosol, and an absorption effect of the aerosol particles on the light can be measured by a temperature sensor in the glass pipe. With the novel method, the absorption effect of the particles on the light is directly measured, the suspension state of the particles is not changed in the measurement process, the air molecular absorption interference is effectively removed in the measurement process, the atmospheric aerosol can be continuously measured in real time on line, and a very good application prospect is showed for quantitative monitoring of meteorological environmental protection departments and research on the microphysical property of the aerosol.

The invention relates to a microporous carbon material, which can be applied to fields such as molecular absorption, pressure swing adsorption separating and barrier separation. The invention discloses a method for preparing the microporous carbon material by taking phenolic resin as raw material and molding, drying and charring. Through controlling the structure of phenolic resin, the pore structure of microporous carbon material can be controlled, so as to meet the demand of the pore structure from different application field.

The invention discloses a measuring method of an atmospheric water vapor molecule absorption coefficient profile. The method comprises the following steps: (1) measuring an atmospheric water vapor molecule density profile, an atmospheric temperature profile and near-ground atmospheric pressure, and calculating out an atmospheric pressure profile according to the near-ground atmospheric pressure; (2) according to the atmospheric water vapor molecule density profile, the atmospheric temperature profile and the atmospheric pressure profile, at a specified altitude, obtaining spectral line absorption strength and continuous absorption strength of each water vapor molecule absorption spectral line at a wave number v, and obtaining the total water vapor molecule absorption strength after summing the spectral line absorption strength and the continuous absorption strength; (3) obtaining an absorption coefficient of atmospheric water vapor molecule at the wave number v according to the measured atmospheric water vapor molecule density profile and the total atmospheric water vapor molecule absorption strength at the wave number v; and (4) repeating the steps (2) and (3), orderly calculating the atmospheric water vapor molecule absorption coefficient at each altitude, and thus obtaining the atmospheric water vapor molecule absorption coefficient profile. The method provided by the invention can measure the atmospheric water vapor molecule absorption coefficient profile in real time.

The invention specifically relates to an infrared spectral recognition method based on water vapor residual spectrum analysis, belonging to the technical fields of spectral measurement and spectral recognition. The infrared spectral recognition method comprises the following steps: generating a pure water vapor transmittance spectrum by using a molecule transmission and absorption database and meteorological parameters; subjecting the pure water vapor transmittance spectrum and a to-be-recognized measured infrared spectrum containing the absorption characteristics of an unknown compound to fitting, and deducting water vapor absorption spectra in the spectrum of the unknown compound waveband by waveband so as to obtain a residual spectrum; and carrying out preliminary peak searching and recognition on the residual spectrum to find out a peak position corresponding to the strongest absorption value of the residual spectrum in each waveband and comparing the peak positions with the molecular absorption peak of each compound in an infrared absorption characteristic database so as to obtain a possible compound component list. According to the invention, the pure water vapor transmittance spectrum is used for deduction of the water vapor absorption spectrum in the to-be-recognized spectrum, so errors of recognition results caused by water vapor are effectively avoided, the precisionof spectral recognition is improved, and rapid recognition of unknown compound components via infrared absorption spectra can be realized.

The invention relates to a method for quantitative determination of sulphite, particularly to a method of measuring content of sulphite in water. A method of measuring content of sulphite in water through gas phase molecular absorption spectrometry, including a gas phase molecular absorption spectrometer, comprises the following steps: step 1 of converting sulphite into gaseous sulfur dioxide; step 2 of using zinc hollow cathode lamp as excitation source, measuring molecular absorption intensity of sulfur dioxide at wavelength 202.6 nm, thereby performing quantitative analysis on sulphite. The inventive method of using measuring content of sulphite in water through gas phase molecular absorption spectrometry has convenient operation, fast analysis speed and small environmental pollution.

The invention discloses a method for obtaining a laser atmospheric transmittance by utilizing a solar radiometer. The method comprises the following steps: measuring the total solar radiation transmittance Tsun of a specified wave band and the content PW of atmospheric vertical water vapor columns by utilizing the solar radiometer, performing analog computation on a spectral response function f (Lambda) by combining a radiance transfer equation and MODTRAN 5.0 software, thus finally obtaining the final calculation model of the total laser atmospheric transmittance Tlaser. The method fully considers the difference between a laser narrow spectral transmittance and a sunlight wide spectral transmittance, establishes the relationship of the laser atmospheric transmittance and the Tsun and the PW measured by the solar radiometer, minimizes the measuring error of the transmittance of laser during transmission in atmospheric air, and is suitable for the condition that atmospheric molecular absorption is mainly H2O absorption.

The invention belongs to the field of sanitation articles, and relates to a thin multi-layer absorption core body and a preparing method thereof. The absorption core body sequentially and structurally comprises a flow dividing and liquid guiding layer, a first high-molecular absorption layer, a fluffy fiber layer, a second high-molecular absorption layer and a shielding layer. The flow dividing and liquid guiding layer comprises a flow dividing layer, an ultra-thin fiber moisture guiding layer and a flow equalizing layer. The shielding layer comprises a flow smoothing layer, an ultra-thin fiber flow shielding layer and a protecting layer. The bottom layer of the multi-layer absorption core body is the shielding layer composed of the flow smoothing layer, the ultra-thin fiber flow shielding layer and the protecting layer, liquid is longitudinally diffused when prevented from leaking downward, and thus the utilization rate of ultra-water-absorption resin is increased and it is guaranteed that liquid is free of reverse osmosis. According to the thin multi-layer absorption core body, a composite core body preparing device does not need to be refitted, meanwhile no wood pulp products are used, and the indirect forest protecting effect is achieved.

The invention relates to a molecular absorption spectrometer adopting gas-liquid separation membrane. The molecular absorption spectrometer adopting gas-liquid separation membrane comprises a reactor and a detector, wherein a gas-liquid separation membrane is installed in an inner cavity of the reactor, and the inner cavity of the reactor is divided by the gas-liquid separation membrane into a first reaction cavity and a second reaction cavity; the first reaction cavity is communicated with an inner cavity of the detector by virtue of a conveying pipeline; the second reaction cavity is connected with a sample feeding apparatus and a gas carrier apparatus; the detector is provided with a light source and a detection apparatus capable of receiving light emitted by the light source. By adopting the molecular absorption spectrometer adopting the gas-liquid separation membrane, after a water sample to be detected reacts with a reagent in the reactor, water in gas generated by the reaction can be directly filtered by virtue of the gas-liquid separation membrane; and moreover, the gas-liquid separation membrane is disposed in the reactor, so that a reaction apparatus is combined with a drying apparatus, the system is greatly simplified, the device is simple to operate, the miniaturization and convenience in carry of instruments can be facilitated, the sample to be detected can be determined on site, and the application range of the instruments can be enlarged.

The invention discloses a surface coupling induced ionization technology, which comprises any one of the following steps of: (1) feeding a first beam of electromagnetic wave into a material through afree space or a waveguide to excite a surface plasma wave; introducing target molecules to be ionized into the surface of the material, coupling electrons of the target molecules with surface plasmonpolaritons on the material by controlling interaction, and inducing the target molecules to be ionized; (2) synchronously passing through a free space or a waveguide, and then feeding a second beam and subsequent electromagnetic waves into an ionization region of target molecules on the surface of the material, so that the ionized target molecules are absorbed, and the ionization degree of the target molecules is improved; and (3) releasing the target molecules in the form of bulk phase plasmas to realize surface coupling induced ionization. The invention also discloses a plasma device.

A cellulose composition, containing:

• • a cellulose compound;
  • a compound represented by formula (I); and
  • a low molecular weight compound (A);

wherein molecular absorption wavelength of the compound (A) derived from an electric dipole transition moment My in a direction approximately orthogonal to a molecular long axis direction, is longer than that derived from an electric dipole transition moment Mx in a direction approximately parallel to the molecular long axis direction; and

wherein |My| is larger than |Mx|:

The invention discloses a synthesis and preparation method of a tripolyindenyl coumarin-corrole-porphyrin quaternary system star-shaped compound as shown in a formula (I) which is described in the specification. The preparation method comprises the following steps: carrying out two-step Suzuki coupling reaction by using 2, 7-dibromo-12-coumarin-based tripolyindenyl with a borate corrole derivativeand a borate zinc porphyrin derivative in sequence to obtain the tripolyindenyl coumarin-corrole-porphyrin quaternary system star-shaped compound shown in the formula (I). The star-shaped compound issimple in synthesis method, mild in reaction condition and relatively simple and convenient to separate and purify. Different groups in the synthesized star-shaped molecules can be subjected to intermolecular high-efficiency energy transfer after being excited by light, and can be applied to the fields of optical molecular absorption antennas, organic solar cells, artificial simulated biologicalphotosynthesis and the like.

The invention relates to a concentration analysis method. The method comprises the following steps: pretreating a sample to be measured; converting an element to be measured into a gaseous compound; introducing the gaseous compound of the element to be measured into a multi-reflection spectral absorption cavity through carrier gas; detecting the attenuation of the laser power in the cavity to obtain a gas laser absorption spectral line; calculating the concentration of a gaseous compound of the element to be measured. In the method, a molecular absorption spectral line is directly adopted for analyzing without using consumable instruments such as a chromatographic column or accessories such as an atomization furnace or an ionization furnace or being interfered with background absorption and fluorescence. In the method, the absolute absorption of light is analyzed by using the sample without frequently making a standard measuring curve as being done for an atomic spectra and the like, so that the measuring flow can be simplified, and the scalar period can be prolonged on a large scale to realize instant measurement, so that the automation and the convenience in measurement are realized. The method has the advantages of high analysis speed, low equipment cost, high sensitivity and accurate measurement.

The invention discloses an all-fiber wind measurement laser radar based on a 1 mu m-2 mu m gas molecular absorption line, which locks emitted laser on the cliffy edge of a molecular absorption line, and measures doppler frequency shift through detecting the energy change of atmosphere echo signals on the molecular absorption line. The all-fiber wind measurement laser radar packages 1 mu m-2 mu m gas molecules in crystal fibers under constant temperature and constant voltage conditions, and realizes a doppler wind measurement radar all-fiber receiving light path based on gas molecular absorption line frequency discrimination. Meanwhile, the all-fiber wind measurement laser radar employs a Galatry function to fit a gas molecular absorption line, and improves the precision of the gas molecular absorption line as a wind measurement benchmark compared with a Voigt function. The all-fiber wind measurement laser radar has the advantages of stable frequency spectrum characteristic, easy satisfied optical path collimating condition, compact structure, stable system, and high detection precision, and is relatively safe for human eyes.

The invention discloses an anti-electromagnetic-interference in-situ measurement system and method for dissolved gas in oil, and belongs to the technical fields of electrical equipment insulation monitoring, optical fiber gas sensing and photoacoustic spectroscopy. Small molecular gas dissolved in oil is diffused into a micro-cavity of an optical fiber photoacoustic sensing probe through an oil-gas separation membrane; photoacoustic pressure waves generated by light absorption of gas molecules to be measured separated from the microcavity are detected by an optical fiber Fabry-Perot interference type cantilever beam, the temperature and the photoacoustic pressure are measured at the same time by adopting an optical cross-correlation demodulation method, and temperature compensation is performed on a photoacoustic pressure value by utilizing the measured temperature. An optical fiber sensing probe integrating a miniature photoacoustic gas chamber and an oil-gas separation membrane is adopted, and photoacoustic exciting light and detection light are transmitted by adopting optical fibers, so the photoacoustic gas sensing probe has an electromagnetic immune characteristic, and long-distance optical fiber remote measurement is realized. The system does not need oil pumping, the potential safety hazard of transformer oil leakage does not exist, transformer oil does not make contactwith air, an oil sample cannot be polluted or consumed, and therefore, the in-situ measurement can be achieved.