48 results about "Aerosol scattering" patented technology

An apparatus comprises a detector, a pressure sensor and a processor. The detector is operable to detect light that is scattered by an aerosol that is associated with a pressure. The pressure sensor is operable to measure the pressure. The processor is coupled to the detector and to the pressure sensor, and is configured to receive at least a signal from the detector and the pressure sensor. The processor is further configured to use the received signals to calculate a volume of the first aerosol, and to output an output signal associated with the calculated volume. The various measurements can be repeated and compared, and the output signal can be a feedback signal for metering subsequent amounts of the aerosol, based on the comparison.

The invention brings forward a pulse laser coherent wind measuring radar, for the purpose of providing a pulse laser coherent wind measuring radar which has the advantages of high measuring precision, simple structure and convenient installation and debugging. The pulse laser coherent wind measuring radar is realized through the following technical scheme: a fiber pulse laser emission system is taken as an emission source for generating two beams of laser, one beam of high repetition frequency pulse sequence laser for wind field detection is directly coupled through an optical circulator and enters an optical transmit-receive scanning system to perform collimated emission towards a target spatial domain, the optical circulator utilizes a polarization splitting characteristic to carry out isolation splitting on emission light and air aerosol scattering echo wave light, the air aerosol scattering echo wave light is selected to enter a fiber combiner, the other beam of laser, generated by the fiber pulse laser emission system, is taken as local oscillator light for inputting into a balance amplification photoelectric detector together with the echo wave light in a frequency mixing mode for optical amplification of a frequency mixing signal, through acquisition processing of a signal acquisition processor, the radial speed of each range gate in a current laser emission direction is calculated, and the radial speeds are transmitted to a radar operation display interface.

The invention discloses an in-situ measurement device and a measurement method of a scattering coefficient spectrum of an atmospheric aerosol. The measurement device comprises an integrating sphere, a solar simulator, a fiber spectrometer and a computer, wherein an internal reflectance coating of the integrating sphere is made from polytetrafluoroethylene, and collection efficiency of the scattered light is improved based on the advantage of truncated corners of the internal reflectance coating, so that the sensitivity in the measurement of the scattering coefficient spectrum is effectively strengthened. In the device and the method, a measure equation for the scattering coefficient spectrum in a wave range from 350 nm to 1000 nm is established, so that the difference of conversion responsivity caused by the difference of the wavelength in a photoelectric conversion process can be effectively avoided. The device and the method can detect evolution rules of the scattering coefficient spectrum of the atmospheric aerosol with the temperature, the humidity and the atmospheric pressure, and have the characteristics of being simple in principle, convenient in operation and fast in detection speed.

The invention discloses an atmospheric aerosol optical property measuring method and a laser radar system which is high in spectral resolution. By locking the laser emission frequency, the function of the laser radar system which is high in spectral resolution is achieved. According to a Fabry-Perot interference narrowband spectral filter, an aerosol scattering component and a molecular scattering component are separated, the difficulty that in a traditional back scattering laser radar, one radar equation is utilized to invert two unknown quantities, namely a aerosol scattering coefficient and an extinction coefficient is appropriately solved, limitation of the emission laser wavelength do not exist, the measured atmosphere back scattering ratio is high in accuracy, and the relative error is small.

The present invention discloses a multi-channel aerosol scattering absorption measuring instrument, comprising a light path device, a detection device and a gas path device. The light path device supplies three different wavelengths of laser entering the detection device in sequence; the detection device is provided with photoelectric detectors at multiple angles for measurement, so as to reduce the measurement error of aerosol scattering coefficient; the gas path device comprises a sample loading unit, a calibration unit and a sample discharging unit; and a light source from the light path device and a gas flow from the gas path device enter the photoacoustic cavity of the detection device respectively and are detected by a control unit. The aerosol scattering absorption measuring instrument of the present invention is characterized by multi-channel, multi-angular, full-scale and direct measurement of scattering phase function and absorption coefficient of aerosol particles, combines the function of synchronously acquiring the optical parameters of an aerosol (such as scattering coefficient, extinction coefficient, visibility, transmittance, single scattering albedo, etc.), and achieves the integrated on-line detection of different optical parameters of an aerosol with high automation degree and good stability.

The invention discloses a method for conducting inland water body atmospheric correction based on oxygen and water-vapor absorption wavebands, and relates to the technical field of remote sensing. The method comprises the steps of processing hyperspectral remote sensing image data of an inland water body, extracting a clean water body image element (dark image element), conducting the rayleigh scattering removal and atmospheric correction on the extracted dark image element, utilizing the oxygen and water-vapor absorption wavebands for combinatorially computing atmospheric correction factors on the corrected image element, conducting aerosol scattering of extrapolation full-wave bands, and utilizing the calculated aerosol scattering value for conducting the atmospheric correction on a whole-scene image. According to the method, the characteristic that the water body is low in reflectivity at the oxygen and water-vapor absorption wavebands is utilized, the water body dark image element is selected, the aerosol scattering is calculated, the phenomenon that due to the fact that in the inland water body atmospheric correction, the water body is high in turbidity, overcorrection is caused is avoided, the precision of the inland turbid water body atmospheric correction is improved, and the technical support is provided for improving the precision of remote sensing retrieval.

The invention discloses a high spectral polarization atmosphere detection laser radar system and a control method. The high spectral polarization atmosphere detection laser radar system comprises a laser emission system, a photoelectric reception/detection system and a multichannel data collection system; the multichannel data collection system is connected to the laser emission system and the photoelectric reception/detection system; through the high spectral resolution raster and a Fabry-Perot interferometer, the high spectral polarization atmosphere detection laser radar system realizes the high spectral high resolution detection function. The high spectral polarization atmosphere detection laser radar system separates the molecule scattering component in the atmosphere echo signal from the aerosol scattering component through the Fabry-Perot interferometer, solves the difficulty, which is met by a traditional backscattering laser radar, in inversion of two unknown quantities including an aerosol scattering coefficient and an extinction coefficient performed by a radar equation. The high spectral polarization atmosphere detection laser radar system can realize the detection of multiple atmosphere parameters, has a high automation level, a simple structure design and strong expandability and can provide the application service for the atmosphere research and atmosphere protection.

The invention discloses an atmospheric correction method for multi-spectral data of an inland turbid water body based on a green light wave band and relates to the technical field of remote sensing. The atmospheric correction method comprises the following steps: (A) preprocessing multi-spectral image data of an inland water body; (B) preprocessing a moderate-resolution imaging spectroradiometer (MODIS) L1B image which is synchronously acquired; (C) extracting clean pixels (dark pixels) from the preprocessed image data; (D) calculating an atmospheric correction factor through short-wave infrared (SWIR) band combination for MODIS data clean pixels; (E) calculating the water-leaving reflectivity of a clean water body green light wave band which is matched with a multi-spectral wave band according to an analog database and a great number of experiment observation data; (F) calculating the aerosol scattering of each wave band according to the atmospheric correction factor which is calculated in the step (D) and the water-leaving reflectivity which is calculated in the step (E); and (G) completing atmospheric correction of the multi-spectral image data according to the aerosol scattering which is calculated in the step (F). According to the method, the atmospheric correction accuracy of multi-spectral remote sensing data of the inland turbid water body is improved.

The invention discloses a measuring system and measuring method of aerosol scattering and moisture absorbing growth factors. The measuring system comprises a drying pipe, a first nephelometer, a second nephelometer, a humidification pipe, a first three-way valve, a second three-way valve, a first two-way valve, a second two-way valve, a first water bath, a second water bath and a computer. According to the measuring system, an outer-layer casing pipe and an inner-layer semipermeable membrane pipe are adopted to form the humidification pipe, water in the humidification pipe and the water baths form a closed cycle, the water temperature is controlled by the water baths, and the highest relative humidity of a humidified aerosol sample can reach 95%; the two water baths are adopted to participate in humidification efficiency controlling, when the system runs, the working modes of the two water baths are staggered and are the heating mode and the refrigerating mode respectively, and therefore the time resolution can be increased by one time; in addition, in the whole circle period, the system is always in a relative humidity increasing period, and therefore effective data outputting is guaranteed.

The invention discloses a device and method for automatic measurement of a natural atmospheric aerosol Mueller matrix.The device is mainly composed of a gas pretreatment unit, a light source unit, a light scattering unit, a scattered light acquiring and measuring unit, a data acquiring and controlling unit and a data processing unit.Mechanical servo control is adopted only for scattering angle measurement, electric control is adopted for all the other element parameters, measurement speed is remarkably increased, all optical components are cured, the number of components does not need to be changed during measurement, measurement processes are greatly simplified, accurate natural atmospheric aerosol scattering parameters can be provided for radiative transmission simulation, and accurate basic experiment data are provided for atmosphere ocean remote sensing and climatology study.

The invention discloses an aerosol scattering phase function observation device and an observation method. The device uses a laser as a light source, emits a laser beam to irradiate the atmosphere and aerosol in the environment to be measured, and uses an imaging device as a receiving end to collect the laser beam to irradiate the atmosphere. The scattered light generated by the aerosol and the aerosol then forms a grayscale image. By processing the grayscale image, the aerosol scattered light sequence is calculated, and the aerosol scattering phase function satisfies the normalized characteristics, and the inverse calculation can be performed. aerosol scattering phase function. The sol scattering phase function observation method proposed by the present invention is different from the prior art, has high sensitivity, strong real-time performance, simple device structure and low cost, and can be widely used in aerosol observation devices, such as aerosol laser radar and atmospheric visibility instrument , aerosol particle spectrometer, etc., to provide data comparison and data reference.

The invention discloses an aerosol phase function observing system and an observing method thereof. The aerosol phase function observing system comprises a laser emission unit, a light trap, a turbidimeter, a scattered signal receiver and a computer. The turbidimeter is installed below a laser beam, and aerosol hemisphere backscattering coefficient is obtained through measurement. The scattered signal receiver is installed beside the laser beam and at the same height of the laser beam. By combining a signal obtained by a CCD camera and the aerosol hemisphere backscattering coefficient measured by the turbidimeter, aerosol phase function is obtained. Different angles of scattering information can be obtained at the same time, and the influence of aerosol scattering performance changing with time on results is avoided. The observing system is simple and effective, is low-cost, provides a new technical means for observation of aerosol phase function, and provides supports for remote sensing observations of inversion of aerosol optical properties related instruments.

The invention discloses a measurement method and apparatus for a laser radar ratio of an aerosol. The measurement apparatus a laser beam source, a spectroscope, an aerosol accommodation space, and a detector. The method comprises the following steps: measuring and obtaining a light energy value E0 of laser before aerosol scattering, a light energy value E of laser after aerosol scattering, and a light energy value Eback of backward scattering light during aerosol scattering of the laser; and the carrying out calculation to obtain aerosol laser radar ratio S according to a formula: S=(E0-E)/Eback. According to the previous method, hypothesis of a laser radar ratio of an aerosol needs to be carried out and then inversion of an aerosol extinction coefficient and a backscattering coefficient of the laser radar can be carried out. However, with the provided method and apparatus, single-point sampling of the laser radar ratio of the aerosol can be realized; the parametric hypothesis during the laser radar aerosol profile measurement technology process can be reduced; and the accuracy, comparability, and representativeness of measurement data can be guaranteed.

The invention discloses an integrating sphere embedded photo-thermal interferential aerosol scattering and absorbing synchronous measurement device. The core is to depend on an optical path system and an air path system of the integrating sphere; the optical path system comprises a stimulating optical path and a detection optical path; some energy of the stimulating optical path is scattered by the aerosol particle and then a scattering signal is generated under the effect of integrating sphere; and meanwhile, the energy has a photothermal effect with the aerosol particle so as to generate an aerosol absorbing signal; the detection optical path is divided into an absorbing measuring part and a scattering measuring part; the scattering measurement adopts an integral optical detector for realizing the scattering coefficient measurement; an optical type Michelson vertical reflecting interference sensing structure is adopted for absorbing measurement; the photo-thermal interference principle is utilized to realize the absorbing coefficient measurement; the scattering and absorbing coefficient measurement of multiple wavelengths can be realized through the device; parameters, such as, aerosol extinction coefficient and single scattering reflection ratio can be acquired through simple treatment on the above basis; the research work for aerosol optical property can be further satisfied; the integrating sphere embedded photo-thermal interferential aerosol scattering and absorbing synchronous measurement device is suitable for the online detection for the atmospheric aerosol optical property.

The invention provides a method and system for assessing influence of aerosol scattering on the CO2 remote sensing detection precision. The method includes: establishing an aerosol particle scattering parameter database, an aerosol mode data set, a CO2 parameter database, and a forward direction radiation transfer calculation model; and determining the error of the CO2 remote sensing detection precision due to aerosol scattering in a region to be assessed according to the established aerosol particle scattering parameter database, the established aerosol mode data set, the established CO2 parameter database, and the established forward direction radiation transfer calculation model. The method and the system can accurately assess the influence of aerosol scattering on the CO2 remote sensing detection precision.

The invention provides an aerosol scattering coefficient moisture-absorption increase measuring instrument. The aerosol scattering coefficient moisture-absorption increase measuring instrument comprises a drying system, an air humidity control system, a data acquisition processing system, and an aerosol scattering coefficient measuring system. The air humidity control system uses a humidificationapparatus, a gas-gas conveying scheme is employed, which is characterized in that moist air with certain humidity is existed at an external chamber of a steam penetration pipe, and the steam is conveyed to sample-introduction airflow in the penetration pipe according to the steam differential pressure inside and outside of the penetration pipe. In addition, the invention also provides an atmosphere aerosol volatilization characteristic measuring method. The aerosol scattering coefficient moisture-absorption increase measuring instrument can be used for measuring the scattering moisture-absorption increase capability of atmosphere aerosol particles. Compared with the prior art, the aerosol scattering coefficient moisture-absorption increase measuring instrument and the measuring method thereof have the function for measuring the atmosphere scattering coefficients under different relative humidity, and have the advantages of high automation degree and good stability.

The invention relates to a method for realizing atmospheric correction of an MODIS (moderate-resolution imaging spectroradiometer) image in a turbid water body area. The method comprises the following steps of: (1) reading an empirical relationship of actually measured standard water-leaving reflectivity of wave bands of 531, 551, 667 and 978 nm, a Rayleigh scattering look-up table, an MODIS image of the wave bands related by the model, synchronous atmospheric pressure, wind speed and ozone thickness data; (2) calculating the reflectivity contributed by each wave band Rayleigh scattering of the MODIS by using a Rayleigh scattering look-up table algorithm on the basis of meteorological data related in the step (1) and correcting the reflectivity; (3) building empirical relationships of thereflectivity of the wave bands of 531, 551, 667 and 978 nm by using the MODIS image data corrected by the Rayleigh scattering, (4) calculating the reflectivity contributed by aerosol scattering of each wave band of the MODIS by using an Angstrom aerosol exponential model on the basis of the step (4), and (5) calculating the reflectivity contributed by path radiance of the atmosphere based on the steps (2) and (4) and carrying out atmospheric correction on the MODIS image.

The invention discloses a particle counting aerosol detecting device, which comprises the following parts: laser, laser beam spatial correcting lens, laser beam spatial filtering pipe, detecting room, laser beam rack, aerosol detecting lens component, aerosol detector tray component, aerosol scattering detector, aerosol detector accident detecting luminotron, light hole and deflector plate. The device realizes the darkest background design of aerosol particle counting detection, minimal scattering action region and detecting field of vision design of single particle scattering impulse counting detection, which affirms the structure need of single aerosol highest sensibility particle impulse scattering signal.

The invention belongs to the field of optical communication technology and atmospheric environment science, and realtes to an ultraviolet light scattering simulation method based on discrete cumulative summation. The ultraviolet light scattering simulation method based on discrete cumulative summation comprises the steps that the lower limit of the radius of atmospheric aerosol particles is 0.001micron, the upper limit of the radius of the atmospheric aerosol particles is 20 microns, the interval is 0.001 micron, cumulative summation is conducted on light scattering of all the particles, anda Monte Carlo method is improved based on discrete cumulative summation; the method comprises a Mie scattering method, a discrete accumulation summation method and a multiple scattering channel model.The multi-scattering channel model judges the scattering type and determines the scattering type of ultraviolet photons, and if aerosol scattering occurs, the Mie scattering theory is met, and a discrete accumulation summation method is used for calculating a light scattering coefficient; and discrete cumulative summation is carried out to obtain scattering, absorption and extinction factors of the polydisperse aerosol model on solar blind ultraviolet light. A discrete cumulative summation method is combined, a method for solving atmospheric scattering, absorption and extinction coefficientsin a Monte Carlo method is improved, and the precision of the simulation method is improved.

A number of etalons together are used to extract the velocity, density and temperature of a scattering medium, such as the atmosphere. An optical air data sensor system incorporates the structure and operation for outputting laser light at a volume of air so as to be scattered by molecules and aerosols in the air volume being scanned; receiving the scattered laser light via a collecting optics assembly; splitting the received scattered laser light from the input optical fiber into a plurality of scattered light emissions; collimating each of the plurality of scattered light emissions; inputting the plurality of collimated light emissions into corresponding ones of a plurality of Fabry-Perot etalons; and imaging each of the plurality of collimated light emissions from the plurality of Fabry-Perot onto corresponding ones of a plurality of non-imaging detectors.

The invention discloses a sand-dust aerosol turbulence flux measurement system and a measurement method thereof. According to the measurement system and the measurement method, a white light source isadopted in an emitter of an extinction coefficient measuring instrument, and the signal-to-noise ratio of the instrument is improved; and a periodically-rotating light chopper is arranged in front ofthe light source, and a difference of scattering extinction coefficients of adjacent sampling points is obtained, and the scattering extinction coefficient of outside noise is eliminated; by increasing the sampling frequency of the extinction coefficient measuring instrument, the high-frequency aerosol scattering extinction coefficient is obtained, and the sand-dust aerosol turbulent flux under the condition of strong dust is obtained; according to the measurement system and the measurement method, the sampling frequency of the extinction coefficient measuring instrument is improved, so thatthe requirement for calculating the turbulent flux is improved; an eddy-correlation technique is used for determining the sand-dust aerosol turbulence flux, the problem about obtaining of mass concentration pulsation and the turbulence flux of sand-dust aerosol is solved for the first time, and the basis is provided for the forecast mode; and in addition, operation is simple, the implementation isstrong, mating with an existing water-heat flux observation system can be achieved, or an observation system can be formed separately, and observation data processing is mature.

The invention is suitable for the technical field of water color remote sensing atmospheric correction, and provides an atmospheric correction method based on satellite remote sensing data, terminal equipment and a storage medium, and the method comprises the steps: obtaining the distribution characteristics of a first wave band aerosol scattering coefficient of a to-be-measured environment and an aerosol scattering coefficient corresponding to a wavelength in a second wave band; according to different distribution characteristics, selecting different processing modes to process the aerosol scattering coefficient corresponding to the wavelength in the second wave band, obtaining the aerosol scattering coefficient corresponding to each wavelength in the first wave band, and performing atmospheric correction based on the obtained aerosol scattering coefficient of the first wave band; according to the invention, different processing modes are selected according to the environment to be measured to obtain the aerosol scattering coefficient of the first wave band, the obtained aerosol scattering coefficient of each wavelength in the first wave band is more accurate, and the accurate aerosol scattering coefficient of each wavelength in the first wave band is used to correct the atmosphere, so that the atmosphere correction is more accurate.