66 results about "Aerosol extinction coefficient" patented technology

A method for determining parameter of atmospheric environment includes using laser radar determining system to receive backward scattering light of atmosphere, splitting received light to be various lights required by laser radar, carrying out analysis and treatment of data as per set program after photoelectric detection for realizing measurement on atmospheric environmental parameters such as temperature, steam density, airosol extinction coefficient, scattering coefficient, airosol optical thickness, visibility and depolarization ratio of non-spherical particle backward scattering light.

This invention is a detecting of Roman-Mie dispersion laser atmosphere signal and laser radar. It sets up the radar with the output of double-frequency 532nm and triple-frequency 355nm, launches the 532nm, 15% of the 35nm to the sky and 85% of the 355nm after diffusion, and the two optical paths parallel with the optical path of the receiving telescope, and simultaneously carry out the pitching motion with the receiving telescope; the receiving telescope backward dispersing light, the backward light gets into the telescope, then passes the glare tube, the adjusting field view stop and ocular glass, and the dichroic mirror process, and divides the 407nm, the 386nm and the 532nm scattered light into three beams, and the 532nm scattered light is divided into 15% and 85% beams, and the four beams are respectively received by the multiplier phototube, magnified by the magnifier and collect and process the data. It can detect the level visibility of the atmosphere, the aerosol of the whole troposphere and the vertical outline of winding cloud light eliminating system and the water and air mixture ratio from the ground to the lower part of the troposphere. The detecting error of the level visibility is 15%, the errors of the aerosol light eliminating modulus and the vertical outline of the water and air mixture are 20%.

The invention relates to a method for acquiring a complex refractive index of urban aerosol on the basis of various ground-based remote sensing technologies. The method comprises the following steps of: acquiring the extinction coefficient and the scattering extinction ratio of the aerosol through an inverse algorithm by virtue of Raman laser radar echo signals, and integrating the extinction coefficient of a certain route to acquire the optical thickness of the aerosol on the route; continuously correcting the extinction coefficient and the scattering extinction ratio by performing iterative alignment on an aerosol optical thickness of a whole atmospheric layer acquired via a sun photometer and the aerosol optical thickness acquired via a laser radar according to a Monte Carlo principle; then acquiring the particle size distribution of the aerosol via a particle spectrometer; and finally, acquiring the complex refractive index of the urban aerosol according to a mie-scattering model by virtue of the known scattering extinction ratio of the aerosol and the particle size distribution of the aerosol. According to the invention, the complex refractive index of the urban aerosol is acquired by the Raman laser radar, the sun photometer and the particle spectrometer, and the method has the advantages of small error, high discriminability and high universality.

This invention discloses dual field view dual-wavelength laser radar scattering meters structure and detection methods, including laser launch unit echo signal receiver modules, the follow-up optical modules, signal detection and acquisition module and control unit; The laser launch unit using Nd: YAG laser, launching 532 nm and 1064 nm wavelength of the laser pulse at the same time and received by the diameters of 400 mm and 200 mm telescope. Two receiving optical telescope module are follow-up optical module. Optical signal from the follow-up optical module are received by the detection and acquisition module and control unit. atmospheric aerosol extinction coefficient of the vertical profile and continuous distribution, and extinction coefficient level of continuous distribution, can be analyzed through the various atmospheric aerosol optical parameters.

The invention relates to a cavity enhanced absorption spectrum device and method for simultaneous measurement of trace gas concentration and aerosol extinction. The LED temperature is controlled by a semiconductor refrigeration chip to ensure the stability of light intensity output. High reflectivity mirrors at both ends of an optical cavity have the same curvature radius and reflectivity greater than 99.9%, and compose a stable optical resonator. Usually, cavity enhanced absorption spectrum measures the light intensity in the cavity with or without gas absorption and the variation curve of the high reflectivity mirrors' lens reflectivity along with the wavelength, and finally the concentration of absorption gas in the cavity can be obtained. The device and the method provided by the invention can realize simultaneous measurement of trace gas concentration and aerosol extinction. The actual measured total absorption coefficient is divided into two parts, one part is a trace gas absorption structure changing rapidly along with the wavelength, and the other part is gas scattering and aerosol extinction coefficient changing slowly along with the wavelength. Nonlinear least-square fitting is carried out on the measured total absorption coefficient to calculate the concentration of the to-be-measured trace gas, and finally the gas absorption structure and gas scattering are deducted from the total absorption coefficient so as to obtain the aerosol extinction coefficient.

The invention provides an inversion method for an extinction coefficient of an aerosol based on a Raman-Mie scattering laser radar, comprising the steps of: Step 1: obtaining an echo signal of a Ramanchannel in the Raman-Mie scattering laser radar, and determining an lidar ratio of the aerosol by Ansmann method, that is, obtaining the extinction coefficient and a backscattering coefficient of theaerosol by using Raman method; Step 2: obtaining an echo signal of a Mie channel in the Raman-Mie scattering laser radar, and inverting a distribution profile of the extinction coefficient of the aerosol based on Fernald method; and Step 3: correcting, based on an inversion result of the Raman method in step 1, key parameters required to invert the distribution profile of the extinction coefficient by using the Mie scattering method in step 2, that is, a boundary value of the extinction coefficient of the aerosol, thereby improving the inversion precision of the distribution profile of the extinction coefficient of the Mie scattering channel. According to the inversion method for the extinction coefficient of the aerosol based on the Raman-Mie scattering laser radar provided by the invention, high-precision detection of aerosols is achieved by combining the characteristics of Raman scattering and Mie scattering.

The invention provides a double-channel light cavity ring-down atmospheric aerosol extinction instrument and an extinction factor measuring method. According to the extinction instrument, utilizes a double-channel light cavity ring-down spectrum technology is applied to carry out in-situ real-time measurement on an extinction factor of atmospheric aerosol. The instrument comprises a light path system, a circuit system and a gas path system, wherein the light path system is internally provided with a first light cavity and a second light cavity, and the first light cavity and the second light cavity are utilized as double channels; and the gas path system respectively provides atmospheric gas and background atmospheric gas containing the aerosol for the first light cavity and the second light cavity, the circuit system can eliminate the transformation of the extinction factor of the aerosol caused by gas change in real time, and the extinction factor value of the atmospheric aerosol is accurately measured in a real time.

The invention discloses a method for estimating the concentration of near-ground inhalable particles (PM10) based on observation data of atmospheric visibility and relative humidity. The method comprises the steps of (S1) calculating a near-ground aerosol scatting coefficient based on horizontal visibility observation data, (S2) calculating aerosol average quality scattering efficiency based on a near-ground aerosol extinction coefficient and PM10 quality concentration, (S3) establishing a correlation model of the aerosol average quality scattering efficiency and the relative humidity according to seasons, background environments and meteorological information, and (S4) estimating the PM10 concentration based on the observation data of the atmospheric visibility and the relative humidity by using the correlation model in the step (S3). According to the method, the near-ground particle pollution level is estimated based on the meteorological data such as the atmospheric visibility and the relative humidity, the deficiency of a particle ground monitoring station can be effectively compensated, and the spatial range of the particle concentration monitoring can be expanded.

The invention discloses an atmospheric visibility measurement method through a lidar, and the method comprises the following steps: obtaining an original echo signal; determining a detection thresholdsignal to noise ratio, and determining the maximum inversion distance through the detection threshold signal to noise ratio; obtaining an atmospheric aerosol extinction coefficient, taking the atmospheric aerosol extinction coefficient as an initial value, substituting the atmospheric aerosol extinction coefficient into a backward integration formula for iteration to obtain the atmospheric aerosol extinction coefficient of each point on a measurement path, and solving the mean extinction coefficient; judging whether the difference between the mean extinction coefficient and the initial valueis greater than a preset iteration error or not: taking the mean extinction coefficient as a new initial value if the difference between the mean extinction coefficient and the initial value is greater than the preset iteration error, and substituting the mean extinction coefficient into the backward integration formula for iteration, or else stopping the iteration and outputting the mean extinction coefficient; adding the mean extinction coefficient to an atmospheric molecule extinction coefficient to obtain the total atmospheric extinction coefficient, and substituting the total atmosphericextinction coefficient into an atmospheric visibility formula to obtain the atmospheric visibility. The method effectively improves the measurement precision of the atmospheric visibility, and also improves the measurement stability of the atmospheric visibility in different atmospheric environments.

The invention provides an aerosol foundation data-based AOD (Aerosol Optical Depth) vertical correction effect evaluation method and system. The method comprises the steps of estimating a near-surface aerosol extinction coefficient and inverting the near-surface aerosol extinction coefficient based on observation data of a foundation visibility meter; inverting AOD based on observation data of a foundation sum photometer; inverting the near-surface aerosol extinction coefficient based on the visibility meter; performing vertical correction on the AOD based on a laser radar observation method or an atmospheric chemistry mode simulation method, and estimating the near-surface aerosol extinction coefficient according to a vertical correction result; and evaluating the effect and applicability of an AOD vertical correction method by comparing the difference between the estimated near-surface aerosol extinction coefficient with the inverted near-surface aerosol extinction coefficient. According to the method and the system, the errors caused by direct use of a satellite for AOD inversion and the evaluation uncertainty caused by a scale effect and the like can be avoided, so that the difficult problems in effect evaluation and applicability selection among various AOD vertical correction methods and various data sources are solved.

The invention discloses a micro pulse lidar system constant calibration method, which utilizes a solar radiation meter to measure and invert so as to obtain whole layer of atmospheric aerosol optical thicknesses of multiple wavelengths. Under the assumed condition that atmospheric aerosol particle-size spectra distribution meets the requirement of Junge size distribution, interpolation is carried out to obtain a whole layer of atmospheric aerosol optical thickness corresponding to a lidar measurement wavelength. Simultaneously, a Fernald method is utilized to solve echo data measured by a lidar along a same path so as to obtain height distribution of aerosol extinction coefficients. On a clear day, atmospheric aerosol can be assumed to be concentrated under the height lower than 6km, integration is performed on the 6km height by the height distribution of aerosol extinction coefficients, and the obtained numerical value can be regarded as the whole layer of atmospheric aerosol optical thickness. Through comparison, calibration coefficients can be obtained.

The invention discloses an aerosol three-dimensional space distribution drawing method. The method comprises the following steps of firstly, observing and inverting an aerosol extinction coefficient vertical profile based on a satellite laser radar, calculating a monthly average aerosol three-dimensional space distribution map of the long-time sequence to obtain an observation-based climatic monthly aerosol extinction coefficient three-dimensional space distribution map and a mode-based climatic monthly aerosol extinction coefficient three-dimensional space distribution map, and calculating toobtain an observation-based and mode-based ratio three-dimensional space distribution map, obtaining an aerosol three-dimensional space distribution situation map hour by hour after observation constraint, and fusing the aerosol three-dimensional space distribution situation map with data observed by a ground-based Mie scattering laser radar and a satellite-borne laser radar, acquiring an hourlyaerosol optical thickness space distribution present map, and finally, acquiring an aerosol three-dimensional space distribution present map cooperating with satellite and ground active and passive remote sensing observation and mode results. Through satellite-ground active and passive remote sensing observation and cooperative fusion of mode results, more reliable aerosol three-dimensional spacedistribution information is provided.

The invention relates to a novel method for measuring the extinction coefficient of atmospheric aerosol. According to the method, a film plated glass pipe, a laser light source, an optical system and a data collection system are included, wherein light has long transmission light path and low loss in the film plated glass pipe, light of a certain wavelength makes long-distance transmission with a certain angle between pipe walls in the glass pipe filled with aerosol, the attenuation information of light by aerosol can be measured through probes at two ends of the glass pipe, and multiple reflections of light in the glass pipe greatly improves the extinction sensitivity of aerosol. The invention sets up the measurement formula of the extinction coefficient of a wave of multi-wavelength, and the relative calculation method based on the ratio avoids the measurement error caused by light intensity fluctuation during photoelectric conversion; and the novel method has the characteristics of simple principle, convenience in operation and fastness in detection speed.

The invention provides a device and method for measuring the extinction coefficient of black carbon aerosol. The device is a two-channel transmission-type atmospheric aerosol measuring device which has high long term reliability and can accurately measure the extinction coefficient of the atmospheric aerosol. The method is characterized by adopting the two-channel photoelectric detection technology and using the ratio of the transmissivity of the filtered gas to the transmissivity of the unfiltered aerosol gas to be detected to show the extinction coefficient of the aerosol and has the advantage of accurate measuring result. The method comprises the following steps: a laser diode (LD) is adopted to transmit a light pulse sequence, the light pulse sequence becomes parallel light after being collimated and is sent out and the light beam is split into two light beams with approximately equal strength with a beam splitter; after respectively passing through a measurement cell channel and a reference cell channel, the two light beams are respectively received by receiving units; the signal received by each channel is processed by a photoelectric signal processing unit and then is sent to a computer control unit by a data acquisition unit; and the computer control unit is used for computing the ratio of the light power detected by the two channels and carrying out logarithmic operation to obtain the extinction coefficient of the aerosol.

The invention discloses a computing method applied to atmospheric aerosol mass concentration horizontal route distribution and can effectively solve the obtaining problem of an aerosol mass concentration real-time distribution situation caused by quick city near-ground aerosol distribution time-space change, non-uniform city pollution source distribution and the like. Only the aerosol mass concentration of a limited position in a zone can be obtained through common fixed-point monitoring, and an aerosol pollution time-space distribution characteristic in a certain route cannot be expressed. In order to solve a distribution situation of aerosol and pollutants in a near-ground horizontal route, the invention provides the computing method for obtaining aerosol mass concentration distribution in routes within 0 to 6 kilometers in real time by comprehensively utilizing a micropulse laser radar and combining a particle counter, a visibility meter and a particle mass concentration measuring instrument. Parameters of aerosol extinction coefficient, particle distribution, mass concentration and the like are associated through theoretical and mathematic models. According to the computing method disclosed by the invention, an effective technical support is provided for research on pollution sources of city aerosol and monitoring on dynamic variation.

The invention discloses an inversion method for the aerosol extinction coefficient horizontally detected by laser radar. The method is combined with a slope method and a classical Fernald algorithm, and can achieve accurate inversion of horizontally detecting the extinction coefficient of aerosol. The method comprises the steps of: calculating extinction coefficient mean value of a uniform segmentin a laser radar echo signal by using the slope method; taking the extinction coefficient calculated by the slope method as an extinction coefficient initial value, substituting the midpoint of the uniform segment of the echo signal as a reference point into a Fernald method integral formula, and calculating an aerosol horizontal extinction coefficient profile. According to the inversion method for the aerosol extinction coefficient horizontally detected by laser radar, by combining with the slope method and the classical Fernald algorithm, the horizontal distribution aerosol extinction coefficient can be inversed, the problem that the conventional Fernald algorithm cannot invert the horizontal aerosol extinction coefficient can be solved due to lack of reference points and a corresponding extinction coefficient, therefore, distribution of near-surface aerosol and pollutants can be detected by the laser radar.

The present invention discloses a method for inverting the function relationship between the aerosol extinction coefficient moisture absorption increasing factor and the relative humidity by adopting the PM2.5 mass concentration as the constraint condition. According to the method, the determined aerosol extinction coefficient alpha dry at the relative humidity of no more than 40% and the PM2.5 mass concentration CPM2.5 are substituted into the formula defined in the specification to calculate the proportional coefficient K, the aerosol extinction coefficient alpha wet and the PM2.5 mass concentration CPM2.5 at the arbitrary relative humidity are determined at the same position, the proportional coefficient K and the PM2.5 mass concentration CPM2.5 at the arbitrary relative humidity are substituted into the formula alpha=K.CPM2.5 to calculate the dry aerosol extinction coefficient alpha dry at the arbitrary relative humidity, the determined alpha wet and the calculated alpha dry are substituted into the formula defined in the specification to calculate the aerosol extinction coefficient moisture absorption increasing factor f, the calculation process of the f is repeatedly performed at least 5 times, and the two groups of the data such as the relative humidity RH of atmosphere determined at the same position and the calculated aerosol extinction coefficient moisture absorption increasing factor f are subjected to fitting to obtain the function relationship. According to the present invention, with the method, the PM2.5 mass concentration in the height range of 0-30 km on the ground can be conveniently detected at any time in a low cost manner.

The invention discloses a method for measuring geometrical factors of a backscattering laser radar. According to the method, after an aerosol backscattering coefficient is measured by using a CCD camera, the aerosol backscattering coefficient is substituted into a backscattering laser radar equation (please see the equation in the specification), in the equation, P(z) is an atmospheric backscattering echo signal at the position of a laser radar receiving distance z, C is an energy-containing constant of a laser radar system, eta(z) is a geometrical factor, beta1(z) and beta2(z) are the aerosol backscattering coefficient and an atmospheric molecule backscattering coefficient at the position of the distance z respectively, alpha1(z) and alpha2(z) are an aerosol extinction coefficient and an atmospheric molecule extinction coefficient of the distance z, and dz is height resolution; the geometrical factors of the backscattering laser radar are obtained through an iteration method. The measured geometrical factors are extremely high in accuracy and easy to measure, the measured geometrical factors are used for correcting signals of the backscattering laser radar, and therefore atmospheric parameter and pollutant concentration detection accuracy in a transition area is greatly improved; the method can be widely applied to detection of atmospheric pollutants of a short distance section through the backscattering laser radar.

The invention discloses a multi-wavelength laser radar aerosol particle spectrum distribution inversion method and system. The method comprises the following steps: acquiring optical data and regularparameters, wherein the optical data comprises an aerosol extinction coefficient and an aerosol backscattering coefficient; determining a kernel matrix; calculating a weight coefficient according to the kernel matrix, optical data and regular parameters; calculating evaluation error according to the optical data, kernel matrix and weight coefficient; determining an evaluation set; and judging whether the evaluation error is within the evaluation set, and if not, adjusting the regular parameters and returning to the step of calculating the weight coefficient, and if yes, determining the spectral distribution of atmospheric aerosol particles based on the weight coefficient through inversion. Compared with the prior art, the method adopts an NCRE algorithm to select appropriate regular parameters to achieve accurate inversion of atmospheric aerosol particle spectrum distribution, and has simple calculation and wide application range.

The invention provides a laser radar transport flux computing method and a laser radar transport flux computing device. The laser radar transport flux computing method includes acquiring extinction coefficients of particulate pollutants collected by laser radar as well as reanalysis-mode meteorological data including wind-field data and humidity data; subjecting the extinction coefficients to humidity correction according to the humidity data in the reanalysis-mode meteorological data so as to obtain dry aerosol extinction coefficients; computing particulate pollutant vertical profiles according to the dry aerosol extinction coefficients and ground monitoring particulate pollutants; computing laser radar transport fluxes according to the particulate pollutant vertical profiles and the wind-field data of the reanalysis-mode meteorological data. The laser radar transport flux computing method has the advantages that the reanalysis-mode meteorological data are used for humidity correction of the extinction coefficients and laser radar transport flux computation, are acquired simply at a quite low cost and comprise the wind-field data and the humidity data which are both high in precision, and accordingly the whole laser radar transport flux computing method is low in cost and high in popularization degree.

The invention discloses a method for correcting a low-layer extinction coefficient profile of a laser radar. The method comprises the steps that firstly, a multi-axis differential absorption spectrometer and the laser radar are simultaneously adopted to measure aerosol extinction coefficient data of a lower atmosphere layer; then the aerosol extinction coefficient data measured by the multi-axis differential absorption spectrometer and the laser radar are calculated to obtain extinction coefficient profile data measured by the multi-axis differential absorption spectrometer and extinction coefficient profile data measured by the laser radar; and finally, the extinction coefficient profile data measured by the multi-axis differential absorption spectrometer are processed and then serve as atmosphere extinction coefficient profile data measured by the multi-axis differential absorption spectrometer, the extinction coefficient profile data obtained before and measured by the laser radar are corrected, and thus the corrected low-layer extinction coefficient profile of the laser radar are corrected. The method has the advantages that the method is simple and efficient, the error of thelow-layer extinction coefficient profile data can be reduced, and the measuring cost can be reduced.

The invention discloses an atmospheric aerosol extinction coefficient measuring method based on a cavity ring-down spectroscopy technology. The cavity ring-down spectroscopy technology is a novel spectrum detection technology, is designed based on the multi-reflection characteristics of a high-reflection mirror, has the advantages of ultra-high sensitivity and low detection limit and provides a novel measuring method for aerosol extinction measurement. A cavity mirror has a very high reflection rate of 99.9-99.9999% and a slow light intensity damping rate, realizes an equivalent optical path of several kilometers or even several tens of kilometers in a cavity and greatly improves the sensitivity and detection limit. The atmospheric aerosol extinction coefficient measuring method based on acavity ring-down spectroscopy technology has sensitivity of 0.2 Mm<-1> more higher than the extinction coefficient detection sensitivity of the traditional extinction coefficient detection method.

The invention provides a method and device for obtaining extinction coefficients of aerosol. The method includes the steps that a laser pulse is emitted into the atmosphere through a lidar, and the power of backscattered light after the laser pulse is scattered by the atmosphere is obtained after receiving and measuring; atmospheric correction parameters at one or more preset positions are obtained through an atmospheric integrating nephelometer; a relational expression between the extinction coefficients of the aerosol and backscattering coefficients is obtained according to the atmospheric correction parameters; and the power of the backscattered light and the relational expression between the extinction coefficients of the aerosol and the backscattering coefficients are substituted intoa lidar equation, and the extinction coefficients of the aerosol at the preset positions are calculated. According to the method and device for obtaining the extinction coefficients of the aerosol, the extinction coefficients of the aerosol can be calculated accurately.

The invention discloses an aerosol extinction coefficient inversion method base on a feedback type RBF neural network. The method includes the following steps: 1) training the RBF neural network by using input and expected output, wherein the power of historical echo signals is used as the input of the RBF neural network and aerosol extinction coefficients obtained from the historical echo signalsare used as the expected output of the RBF neural network; and 2) inverting the aerosol extinction coefficients based on the feedback type RBF neural network. The method uses the feedback type RBF neural network to invert the aerosol extinction coefficients and stores internal mechanisms between information in a network through the learning of sample patterns, which effectively avoids the uncertainty caused by a plurality of assumptions. The method has fast response speed and good robustness.

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 ground-based laser radar aerosol inversion method and system based on a laser radar satellite, and the method and system are combined with a ground-based laser radar and a satellite-borne laser radar to improve the aerosol profile concentration inversion precision. The inversion process comprises the following steps: based on indirect adjustment, using equations measured by a ground laser radar and a satellite-borne laser radar to calculate a profile of an aerosol extinction backscattering ratio in a period; according to a layered AOD product of the satellite-borne laser radar, determining the height of an initial boundary point and aerosol characteristics of the height, and determining an initial calculation value of a backward integral; and according to the determined aerosol extinction backscattering ratio and the signal of the ground-based laser radar, using an aerosol extinction coefficient formula deduced by using a Fernald method to calculate an aerosol extinction coefficient at a certain height, and further obtaining the aerosol optical thickness. According to the invention, when pollution is serious and weather conditions are poor, accurate data can be obtained, and not only is good precision achieved, but also high stability is achieved.

The invention discloses an optical remote sensing method for acquiring absolute light intensity of aerosol. According to the invention, an optical remote sensing system composed of at least a light source, optical fiber, a CCD detector, a spectrograph, a telescope, optical corner reflectors, a pan-tilt, a controller and a computer is involved. The telescope is connected to the spectrograph through optical fiber. The spectrograph is connected to the CCD detector, which is connected to the controller. Two optical corner reflectors are arranged. The telescope is installed on the pan-tilt. The controller is connected to the detector, the pan-tilt and the computer, and sets measuring time to drive the telescope to rotate. Through different light paths formed by the light source and the two optical corner reflectors, light intensity of different light distances is measured. The controller is connected to the computer and transmits a measuring result into the computer so as to calculate absolute light intensity of aerosol. Selection of light distances is set according to detection limit in measurement of atmospheric pollution gas types and aerosol extinction coefficients. The invention provides technical support for treating national haze weather, reducing aerosol pollution and researching atmospheric gas phase / particle heterogeneous reaction.