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52 results about "Ceilometer" patented technology
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A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or cloud base. Ceilometers can also be used to measure the aerosol concentration within the atmosphere. When based on laser, it is a type of atmospheric lidar.
Laser ceilometer dynamic threshold selecting method based on pulse echo forms
The invention relates to a laser ceilometer dynamic threshold selecting method based on pulse echo forms, and belongs to the field of laser remote sensing. The laser ceilometer dynamic threshold selecting method based on the pulse echo forms solves the problems that in an existing threshold selecting method, only extreme point positions or fifty-percent peak point positions or dual-threshold positions of pulse echoes are adopted to confirm transition time of laser pulses, the selected thresholds can be only suitable for specific measurement conditions or plane targets of small slopes. According to the laser ceilometer dynamic threshold selecting method based on the pulse echo forms, a mathematic model of the laser ceilometer pulse echo forms, noise standard deviation and threshold rising edge moment variance is regarded as a theoretical basis, the range error minimization of a laser ceilometer serves as a basis, and the optimization selection of the threshold coefficient of the laser ceilometer is achieved through a parameter iterative search method. The influences of noise and pulse widening introduced by gap title effects of the plane targets are fully considered in the threshold value selection method, range errors caused by threshold setting can be reduced, and the satellite-borne laser ceilometer can complete high-precision laser ranging of the plane targets of different slopes under different measurement conditions.
Owner:WUHAN UNIV
Buoy-based long-time on-line monitoring apparatus and method for sea cloud height
InactiveCN106125084AHigh precisionHigh spatio-temporal resolutionElectromagnetic wave reradiationICT adaptationCeilometerBuoy
The invention provides a buoy-based long-time on-line monitoring apparatus for the sea cloud height. The apparatus comprises a buoy; and a laser ceilometer, a buoy attitude measuring module, a cloud height correction and compensation module, a communication module, and a meteorology and hydrology observation sub system. The buoy attitude measuring module is used for measuring attitude parameters, like a heading parameter, a rolling parameter and a pitching parameter, of a buoy platform; the cloud height correction and compensation module is used for realizing cloud height observation correction and compensation based on the attitude parameters of the ceilometer; and the communication module is used for uploading the data that can be used by users. According to the invention, buoy-based laser radar cloud height observation is carried out and the measurement result is accurate and reliable; off-shore, long-term continuous, real-time, high-precision, high-temporal-spatial-resolution marine environment monitoring on the cloud height, cloud thickness, and conventional marine meteorology and hydrology can be realized; an accurate and reliable data support can be provided for scientific researches of marine atmosphere, weather forecasting, ocean shipping, and naval drills and the like; and thus the apparatus has important significance in development of multiple fields like the marine economy, the marine science and technology, and the legal rights safeguarding on the sea.
Owner:OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
Regional ground surface irradiance distribution predicting method
InactiveCN104217259AAchieve powerImprove calculation accuracyForecastingInformation technology support systemIlluminanceObservation data
The invention relates to a regional ground surface irradiance distribution predicting method which is used for determining minute-level ground surface irradiance regional distribution prediction within future 1 hour. The regional ground surface irradiance distribution predicting method comprises the following steps of: determining a local cloud base height; performing image process on a foundation cloud picture; predicting local ground surface irradiance distribution. The regional ground surface irradiance distribution predicting method provides calculation of the cloud base height by utilizing the ground surface regular meteorological observation data, realizes ground surface irradiance and photovoltaic power prediction within the local range through combination of foundation cloud picture data, is free from the dependence from a traditional method to the observation of the cloud base height, and improves calculation accuracy of cloud position and size at the absence of a ceilometer and the water level total irradiance prediction accuracy of a photovoltaic power station.
Owner:STATE GRID CORP OF CHINA +2
Laser ceilometer optical system and light-splitting reflector thereof
InactiveCN104330843AEffective reflectionIncrease profitWave based measurement systemsMirrorsCeilometerOptoelectronics
The invention discloses a laser ceilometer optical system and a light-splitting reflector thereof. The light-splitting reflector comprises a reflector body. The reflector body comprises a light-permeable area at the center place and a light-reflecting area beyond the light-permeable area. The reflector body has an upper surface and a lower surface, wherein the light-permeable areas of the upper and lower surfaces are respectively plated with an antireflection film; the light-reflecting area of the upper surface is plated with a full-reflection film; and the light-reflecting area of the lower surface is plated with a deglossing paint. The light-splitting reflector in the laser ceilometer optical system can realize a light-splitting function by plating different films at different areas of the two surfaces respectively, and can enable emission light to pass effectively and reception light to be reflected effectively, thereby not only guaranteeing the majority of laser to be transmitted to the lens and the minority of laser to be reflected to an energy detection device, and meanwhile, enabling reception signals to be reflected to a receiver, but also improving light utilization rate, and reducing interference of stray light; the laser ceilometer optical system and the light-splitting reflector thereof are simple in structure, convenient to install and debug, and good in performance, and have very high practical value and profound economic significance.
Owner:CAMA LUOYANG ENVIRONMENTAL MEASUREMENT
Cloud resource monitoring system and cloud resource monitoring method based on openstack
InactiveCN106961367AAddressing deficiencies in monitoringSolve problemsData switching networksCeilometerMonitoring system
The invention discloses a cloud resource monitoring system and a cloud resource monitoring method based on openstack, wherein the system and the method relate to the field of cloud resource monitoring. A Ceilometer system is disposed through building an openstack cloud platform. The system architecture of the cloud resource monitoring system mainly comprises a Ceilometer Agent, an API Server, a monitoring data storage module, a cloud resource virtual machine and a user. The Ceilometer Agent regularly acquires monitoring data of the cloud resource virtual machine and transmits a request to the API Server. The API Server writes the monitoring data into the monitoring data storage module. The user can transmit a monitoring data acquiring request to the API Server. The API Server extracts the monitoring data of the monitoring data storage module and furthermore returns the monitoring data to the user. The cloud resource monitoring system and the cloud resource monitoring method have advantages of settling a problem of insufficient existing cloud resource monitoring, facilitating in-time mastering of a problem in cloud resource operation by monitoring personnel, improving real-time system performance and ensuring continuous stable operation of a cloud platform.
Owner:JINAN INSPUR HIGH TECH TECH DEV CO LTD
Measurement method and monitoring system of atmosphere vertical visibility
InactiveCN104819963AImprove bindingOvercome the extinction coefficientScattering properties measurementsVisibilityCeilometer
The invention discloses a measurement method and a monitoring system of atmosphere vertical visibility. In the measurement method, by means of a new relationship of extinction coefficient to visibility, which is established through a laser cloud height instrument and a visibility instrument, an influence on the vertical visibility due to difference of the relationship of the extinction coefficient to the visibility since the micro-physical characters of atmospheric aerosol particles are different can be overcome, so that the atmosphere vertical visibility can be measured more definitely and can be applied in various environments. The monitoring system can achieve monitoring of the atmosphere vertical visibility in real time in all weather in an unmanned unattended operation manner.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Automatic focus distance adjusting device and method for optical system of laser ceilometer
InactiveCN109491038AEnsure consistencyAutomatically adjust focusMountingsCondensersLaser transmitterRadar
The invention discloses an automatic focus distance adjusting device and method for an optical system of a laser ceilometer and relates to the technical field of laser radars. Lens mounting grooves are formed in one end of a lens housing, an emitting lens and a receiving lens are mounted in the lens mounting grooves respectively and fixed by an emitting lens pressing ring and a receiving lens pressing ring respectively, screw holes used for mounting a laser emitter bracket assembly and a laser receiver bracket assembly are formed in the other end of the lens housing, and a stepping motor is mounted on the laser emitter bracket assembly and connected to a stepping motor control system; a laser emitter assembly is mounted on the laser emitter bracket assembly and fixed by an emitter fixing base, a laser receiver assembly is mounted on the laser receiver bracket assembly and fixed by a receiver fixing base, and an infrared laser display card is placed in front of the lens housing. According to the device and the method, the focal distance is automatically adjusted conveniently and quickly, the consistency of adjustment results of the optical system is ensured, and the device is easy to apply and popularize.
Owner:中科星图维天信(北京)科技有限公司
Laser ceilometer integrated test system and integrated test method thereof
ActiveCN108828537ACapable of simulating different ground featuresCapable of simulationWave based measurement systemsLaser technologyCombined test
The present invention discloses a laser ceilometer integrated test system and an integrated test method thereof, belonging to the technical field of lasers. The laser ceilometer integrated test systemand the integrated test method thereof achieve simulation of different surface features and simulation of a solar spectrum required by performance test of a laser-measured height subsystem in a mapping camera, and are applied to calibration of index parameters of the laser-measured height subsystem, wherein the index parameters comprise delay time constant of a whole machine, distance measurementprecision, a distance measurement range, distance measurement resolution, detection sensitivity, the maximum ranging, etc. The laser ceilometer integrated test system is high in integration, convenient and rapid in control, and can improve the reliability and the stability of the laser ceilometer integrated test system on the basis of achieving the functions mentioned above.
Owner:NANJING UNIV OF SCI & TECH
Determination method for satellite laser ceilometer pin point geometry positioning errors
The invention relates to a determination method for satellite laser ceilometer pin point geometry positioning errors and belongs to the field of laser remote sensing. The problems that an existing pin point geometry positioning error analysis method neglects position and the angle placement errors between a laser measuring system and a carrying platform sensor, only provides partial instant geometry positioning error molds of laser pin points on the premise that height fluctuations of a measured target are not considered and does not analyze extreme values of laser pin point geometry positioning errors are solved. On the basis of the satellite laser ceilometer pin point geometry laser pin point geometry positioning process and error communication theory, the method for comprehensively determining the satellite laser ceilometer laser pin point geometry positioning errors is provided by comprehensively considering the influence on various error sources and plane target fluctuations; the analysis method with the combination of the instant geometry positioning error and the extreme geometry positioning error can achieve comprehensive analysis and evaluation of performance indexes obtained before and after emission of a satellite laser ceilometer.
Owner:WUHAN UNIV +1
Underpower millimeter-wave ceiling metering method
ActiveCN104215955AImprove detection abilityElectromagnetic wave reradiationRadio wave reradiation/reflectionCeilometerEngineering
The invention discloses an underpower millimeter-wave ceiling metering method. The underpower millimeter-wave ceiling metering method adopts an underpower millimeter-wave ceilometer composed of an antenna, a transceiving unit, a power source and a terminal. The transceiving unit generates stable modulated millimeter wave signals which are radiated to the air through the antenna and received by the antenna, then the millimeter wave signals returned by cloud scattering are decoded and converted into numerical signals, and the numerical signals are correspondingly accumulated to be transmitted to the terminal; the terminal analyzes signal power spectrums, the signal power spectrums are accumulated to identify cloud characteristic quantity; transmission pulse width and pulse repetition rate of the transceiving unit are set by the terminal. By the underpower millimeter-wave ceiling metering method, conventional high-power millimeter-wave ceiling metering effect can be achieved by underpower millimeter waves.
Owner:XIAN HUATENG MICROWAVE
Method and device for adjusting optical axis parallelism of transmitting and a receiving optical system of dual-axis laser ceilometer
ActiveCN103645745ASimple structureSimple and fast operationControl using feedbackElectromagnetic wave reradiationOptical axisCeilometer
The invention discloses a method and a device for adjusting the optical axis parallelism of a transmitting and receiving optical system of a dual-axis laser ceilometer. The method is characterized in that a transmitting telescope and a receiving telescope are fixed on the same plate, the transmitting telescope can be adjusted in the horizontal direction, the receiving telescope can be adjusted in the pitching direction, a CCD detection module is installed at the position of the transmitting telescope, another CCD detection module is installed at the position of the receiving telescope, a visible light source target is placed in an area where an overlap factor is 1 in front of a transmitting and receiving optical path, view field images detected by the two CCD detection modules are inputted to a computer, the position of the target in the view field image is determined, a view field image of the transmitting and receiving optical path is observed on the computer, and the target is enabled to be imaged in the two view fields clearly and located at the center of the view fields, thereby completing once transmitting and receiving optical path adjustment; and then a further target is selected. The method and the device disclosed by the invention are applied to adjustment and calibration of the transmitting and receiving optical path of the laser ceilometer, simple in structure, and simple and quick in operation.
Owner:皖江新兴产业技术发展中心
Cloud hard disk dynamic scheduling method and device of Open Stack cloud platform and electronic system
InactiveCN109802976AImplement dynamic schedulingIncrease profitResource allocationTransmissionElectronic systemsResource information
The embodiment of the invention provides a cloud hard disk dynamic scheduling method and device for an Open Stack cloud platform and an electronic system, and the method comprises the steps: enablinga ceilometer module of the Open Stack cloud platform to communicate with a cloud host, and determining the real-time used capacity of a cloud hard disk mounted on the cloud host; When the real-time used capacity of the cloud hard disk is within a preset alarm range,starting the cloud hard disk; mounting A new cloud hard disk on a cloud host through a binder module of an Open Stack cloud platform or the mounted cloud hard disk is deleted to achieve dynamic scheduling of the cloud hard disk; the user experience is ensured; According to the method, the utilization rate of the cloud hard disk is improved, and meanwhile, different cloud hard disks can be distributed to different cloud hosts through the method, so that different requirements on the cloud hosts are met, the real-time performanceof management is ensured, an effective management and approach is provided for the operation of the cloud hosts, and meanwhile, the accuracy of resource information obtained by a monitoring system isensured.
Owner:AEROSPACE INFORMATION
Device and method for debugging emitter position of ceilometer
The invention relates to a device and a method for debugging emitter position of a ceilometer. The method comprises the following steps: (1) placing the emitter at a theory position of the focus of a lens so that the emitter emits light rays; (2) after a debugging plate generates reflecting light spots reflected by a plane mirror when light beams to be emitted pass through holes of the debugging plate and shine on the plane mirror, moving the plane mirror so that the light spots of different holes fall on the holes positioned on corresponding position of the debugging plate; (3) debugging the position of the emitter according to the relative positions of the reflecting light spots falling on the debugging plate so that the central positions of the reflecting light spots of the different holes are overlaid with the centers of the corresponding holes, the light spots are minimum, and the emitter is positioned at the focus position, i.e. an optimal placed position of the emitter of the ceilometer, of the lens at the time. The method which determines the focus position of the lens by measuring the size of an image has high precision, is convenient and easy to operate and can accurately determine the focus position of the lens, thereby determining the optimal placed position of the emitter.
Owner:CAMA LUOYANG ENVIRONMENTAL MEASUREMENT
Outdoor real-time calibration method and device based on double external black bodies and applied to foundation infrared ceilometer
ActiveCN104181614AAvoid errorsReduce the number of timesPyrometry using electric radation detectorsICT adaptationTemperature controlCeilometer
The invention discloses an outdoor real-time calibration method based on double external black bodies and applied to a foundation infrared ceilometer. According to the outdoor real-time calibration method based on the double external black bodies and applied to the foundation infrared ceilometer, two planar black body radiation source assemblies are adopted, one black body is kept in the normal temperature state through a temperature control assembly, and the other black body is kept in the high temperature state through the temperature control assembly; the two black bodies are located on the two sides of an optical machine assembly of the foundation infrared ceilometer respectively; before observation, the optical machine assembly is rotated by the foundation infrared ceilometer, so that infrared radiation values of all detection units of one black body are acquired by a non-refrigeration infrared focal planar array, then the optical machine assembly is rotated again, so that infrared radiation values of all detection units of the other black body are acquired, and real-time calibration is conducted by solving a calibration model; before observation conducted through the foundation infrared ceilometer, one black body is kept in the normal temperature state through the temperature control assembly, the other black body is heated to be in the high temperature state, and the temperature difference between the two black bodies is not smaller than 20 DEG C. According to the outdoor real-time calibration method based on the double external black bodies and applied to the foundation infrared ceilometer, a real-time calibration coefficient is solved through the outdoor real-time calibration model and is stored in a corresponding storage unit.
Owner:PLA UNIV OF SCI & TECH
Cloud computing monitoring method and device
ActiveCN105610643AAvoid inflexible situationsWith monitoring functionData switching networksCeilometerNetwork monitoring
The invention is applicable to the field of cloud computing monitoring, operation and maintenance, and provides a cloud computing monitoring method and device. The cloud computing monitoring method comprises that a network monitoring tool Nagios collects the monitoring data of a device according to configured self-defined monitoring options and writes the collected monitoring data in an Ndoutils database; a monitoring assembly Ceilometer is connected with the Ndoutils database, reads and analyzes the monitoring data in the Ndoutils database and writes the analyzed monitoring data in a Ceilometer database; and the monitoring assembly Ceilometer monitors the device according to the currently written monitoring data and stored history monitoring data. The method and the device provided by the invention has the advantages that firstly, the Ceilometer can monitor the information of devices such as a physical machine and a router through the Nagios; secondly, the Nagios carries out self-defined warning to the hardware device through the distributed warning mechanism of the Ceilometer; the condition that the own warning mechanism lacks of flexibility is avoided; and thirdly, the method and the method are easy in maintenance and development; and different monitoring options can be designed according to different demands.
Owner:CHINA COMM SOFTWARE TECH CO LTD +1
Airspace particulate matter vertical distribution monitoring method based on laser radar
InactiveCN106199632AElectromagnetic wave reradiationICT adaptationParticulatesContinuous measurement
The invention discloses an airspace particulate matter vertical distribution monitoring method based on laser radar. The method comprises the steps of 1, conducting signal detection on airspace particulate matter and conducting data acquisition to obtain data X1; 2, measuring the cloud layer height of airspace to obtain data Y; 3, conducting continuous measurement on aerosol, air pollutant and vapor to obtain data X2; 4, conducting continuous measurement on the concentration of air pollutant to obtain data X3; 5, executing step 1, 3 and 4 based on the time interval of T0 to obtain time data T. The cloud layer height of airspace is measured with a laser ceilometer, measurement time serves as the ordinate and abscissa of detection, the concentration and distribution points of airspace particulate matter are monitored through back scattering laser radar, differential absorption radar and Raman-Mie scattering laser radar, and future airspace particulate matter is predicted by means of time period.
Owner:苏州光亿达环境科技有限公司
Rotary type laser ceilometer for observing cloud amount
ActiveCN103235316AEfficient detectionEasy detectionElectromagnetic wave reradiationICT adaptationBeam expanderSky
The invention designs a rotary type laser ceilometer for observing cloud amount. A fixed zenith angle is changed into a rotary transmitting and receiving system in a certain three-dimensional space angle, and clouds at different positions are sampled. The rotary type laser ceilometer can increase sampling on the clouds in the sky so as to improve the observation precision of the cloud amount; and one set of the laser ceilometer is utilized to realize the observation of two basic parameters including a cloud height and the cloud amount. The rotary type laser ceilometer comprises a laser transmitting system and a laser receiving system; the laser transmitting system comprises a laser device and a beam expander; the laser receiving system comprises a telescope, a convex lens, a narrow-band filtering sheet and a photomultiplier; the convex lens, the narrow-band filtering sheet and the photomultiplier are mounted in a lens cone of the telescope; the laser device and the beam expander are mounted on the outer wall of the lens cone of the telescope; the rotary type laser ceilometer further comprises a bottom bracket, a rotary shaft, a first motor and a second motor; the lens cone of the telescope is fixedly connected with the rotary shaft; the two ends of the rotary shaft are erected in the bottom bracket through a bearing seat; the rotary shaft is in transmission connection with the first motor and the first motor is mounted on the bottom bracket; and the bottom bracket is in transmission connection with the second motor.
Owner:郑州漫光科技有限公司
Cloud cluster height measuring method based on dual foundation cloud atlas
ActiveCN105783861AImprove calculation accuracyWide coverageHeight/levelling measurementMeasuring instrumentPosition angle
The invention provides a cloud cluster height measuring method based on a dual foundation cloud atlas. The method comprises the following steps: step A, determining the relative distance and relative direction between two imagers; step B, recognizing the identical cloud clusters in the cloud atlases of two imagers and extracting the position information of the identical cloud cluster; step C, determining the height of the cloud cluster based on the position information. According to the measuring method, the observation images of dual foundation cloud imager are used, the same cloud clusters are recognized, the position angles are extracted, and thus the height of the bottom of the cloud clusters above a region can be accurately calculated. Compared with the conventional ceilometer, which can only measure the heights of bottoms of clouds that are right above the ceilometer, the provided method can measure the height of clouds that are right above the imagers and is capable of measuring the height of clouds in other positions in the observation range of the imagers; and the method has the advantages of wide coverage and high calculation precision.
Owner:STATE GRID CORP OF CHINA +1
Cloud platform physical link connectivity detection device, method and system
The invention provides a computing node device, a control node device, a method and a system for cloud platform physical link connectivity detection. The computing node device comprises a Neutron-ovs-agent component, an Ovs component and a Ceilometer-poly-agent component, wherein the Neutron-ovs-agent component is used for storing the Ceilometer-poly-agent component into the Ovs component; the Ovscomponent detects whether the vlan range of the data network is connected or not in a mode determined by sending an icmp request message according to the vlan range of the virtual network to be detected; and the Ceilometer-poly-agent component is used for acquiring detection result information from a database corresponding to the Ovs component, and sending the detection result information to thecontrol node. According to the invention, the automatic connectivity detection on the data network card between the computing nodes in the dpdk scene can be realized, and the stability and security ofthe network are enhanced.
Owner:FENGHUO COMM SCI & TECH CO LTD
Device for measuring laser energy of laser radar ceilometer
InactiveCN101408620AThe proportional relationship is stableWave based measurement systemsPhotometryMeasurement deviceCeilometer
The invention relates to a laser energy measurement apparatus in a laser radar ceilometer. The laser energy measurement apparatus in the laser radar ceilometer comprises an energy detection device and a diaphragm arranged in front of the energy detection device, ground glass arranged in front of the diaphragm, and an optical filter arranged between the diaphragm and the energy detection device. The apparatus is mainly used for solving the problem of unstable proportional relation between the measurement results of the laser energy measurement apparatus and the actual energy received by a laser receiver, and the problem is caused by temperature drift in the central wavelength of the laser.
Owner:凯迈(洛阳)测控有限公司
Automatic cloud signal recognition method based on finite-state machine
InactiveCN106291588AAvoid Signal FluctuationsAvoid interferenceElectromagnetic wave reradiationICT adaptationCloud baseCeilometer
The invention discloses an automatic cloud signal recognition method based on a finite-state machine. According to the method, basic characteristics of the cloud signals are generalized into cloud base, cloud peak, cloud top and public boundary of two clouds according to the whole characteristics of the cloud signals; ceilometer signals can be separately chosen out by encoding ceilometer echo signals into cloud signal description sentences. The method comprises the steps that the cloud signals and related inversion parameters are smoothly filtered, and a first-order derivative of the echo signals is obtained; then the cloud base, the cloud peak, the cloud top and the public boundary of the two clouds are encoded into the cloud signal description sentences; the situation that the signals of rain, fog and peak interference are judged as the cloud signal in error is avoided by recognizing and logically analyzing the characteristics of the cloud signals; positions of the cloud base, the cloud peak and the cloud top in a cloud layer can be given out. The method can meet the situation of recognizing three layers of clouds to the maximum degree and improves the cloud signal recognition success rate.
Owner:安徽安光环境科技有限公司
Opto-mechanical system of semiconductor laser cloud height automatic measuring instrument
InactiveCN101452076BSolve problems that cannot be fully receivedEasy to install and debugElectromagnetic wave reradiationICT adaptationBeam splitterCeilometer
Owner:ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Foundation infrared ceilometer on-site calibration method and device
ActiveCN104181613AConvenient and fast regular on-site calibrationGuaranteed stabilityPyrometry using electric radation detectorsCeilometerTwo temperature
The invention discloses a foundation infrared ceilometer on-site calibration method. A portable point source black body is adopted, a two-dimensional fine position adjustment mechanism is additionally arranged, so that the two-dimensional position of the point source black body is fine adjusted; the point source black body has at least two temperature calibration points in the actual calibration process, and calibrated temperatures of the two temperature calibration points keep stable on two temperature points with the temperature difference of at least 30 DEG C. On each temperature point, a plurality of detection pixel points are evenly distributed in a radiation image obtained through an optical assembly of a foundation infrared ceilometer by adjusting the position of the point source black body; then the pixel points are calibrated in a two-point mode, a correction coefficient is obtained, then interpolating is carried out according to a stored original calibration coefficient matrix and latest correction coefficients of the detection pixel points and a full correction coefficient is obtained.
Owner:PLA UNIV OF SCI & TECH
Clear-air echo automatic recognition method and system for millimeter wave ceilometer
ActiveCN109343063AImproved ability to detect cloud cover in real timeImprove detection accuracyRadio wave reradiation/reflectionICT adaptationCeilometerIntersection of a polyhedron with a line
The invention relates to a clear-air echo automatic recognition method and system for a millimeter wave ceilometer. The method includes the following steps that: the echo data of a target region are acquired; the reflectivity factors, velocity absolute values and echo heights of different regions are put into statistics; first classification is performed on the echo data according to an initial threshold value; data about the change of the amplitude of the signals of the millimeter wave ceilometer with the time are obtained; the echo data are preprocessed according to initial input information, so that power spectrum data are obtained, a zero-crossing point is obtained according to the intersection of a mean and a filtered power spectrum, and classification is performed; second classification is performed on the echo data according to a classification threshold value on the basis of the power spectrum data; clear-space echoes and weak cloud echoes which are obtained after the second classification are subjected to spatial-scale distribution statistics; and third classification is performed on the echo data according to the discriminant threshold value of spatial scale distributiondata. With the method and system provided by the technical schemes of the present invention adopted, the influence of clear-air echoes in an atmospheric boundary layer on the millimeter wave ceilometer in a measurement process is eliminated.
Owner:CMA METEOROLOGICAL OBSERVATION CENT
Semiconductor laser ceilometer with double-optical-axis structure
InactiveCN110988913AAvoid saturationLow costElectromagnetic wave reradiationICT adaptationCeilometerStray light
The invention discloses a semiconductor laser ceilometer with a double-optical-axis structure and belongs to the technical field of semiconductor laser ceilometers. The signal-to-noise ratio of the system is improved by performing high-speed signal acquisition on a signal subjected to direct-current amplification isolation by using an ADC chip and performing multiple data cumulative averaging andother processing by using an FPGA. The double-optical-axis design is adopted, and advantages are as follows: the structure is simple, saturation of a receiver can be avoided and optical interference can be effectively avoided without compensation measures. Meanwhile, the detection capability of the near-field cloud height can be improved; the long-focus large-aperture lens is simple in structure,low in cost and easy to realize; the influence of stray light generated by scattering of the inner wall of the system on a near field is reduced by adopting a spatial diaphragm; an optical filter is an interference optical filter with the parameters as follows: central wavelength is 905 nm, the diameter is 25.4 mm and the bandwidth is 25 nm; the transmittance in a band pass is about 50%-75%, the transmittance in a band stop is less than 1%, background light of other various wavelengths is effectively inhibited, echo light of a working band only enters a detector, and the signal-to-noise ratioof the system is improved.
Owner:JIANGSU LUMISPOT PHOTOELECTRIC TECH CO LTD
Optical system of laser ceilometer
ActiveCN101634707ASolve the problem of spatial coherenceCompact structureElectromagnetic wave reradiationICT adaptationLaser transmitterOptical axis
The invention relates to an optical system of a laser ceilometer, comprising a laser emitter, a laser receiver, an emitting optical system and a receiving optical system, wherein the emitting optical system and the receiving optical system share an optical lens, and a dichroic reflector is arranged between the optical lens and a focal plane positioned below the optical lens in an inclining way and is positioned on an optical axis of the optical lens; and the laser emitter and the laser receiver are respectively arranged on focal planes of the emitting optical system and the receiving optical system. The invention has the advantages of compact structure, small volume, light weight and low cost.
Owner:CAMA LUOYANG ENVIRONMENTAL MEASUREMENT
Laser ceilometer
PendingCN113093223AFacilitate subsequent signal processingImprove stabilityElectromagnetic wave reradiationICT adaptationCeilometerEngineering
A laser ceilometer comprises a laser, a circulator, an optical antenna, an optical detector and a signal processor. Laser emitted by the laser enters the circulator; the optical antenna transmits the laser passing through the circulator to a cloud layer and receives the laser returned from the cloud layer; the optical detector converts the laser returned from the cloud layer into an echo signal and sends the echo signal to the signal processor electrically connected with the optical detector for processing and analysis; the optical detector adopts an adjusting mode that the APD gain exponentially increases along with the time from laser pulse emission to return. Compared with the prior art, the laser ceilometer improves the stability of echo signals.
Owner:BEIJING REALLIGHT TECH
Automatic inversion arithmetic based on height of laser radar mixed layer
ActiveCN101520515BGet the height accuratelyEasy to identifyElectromagnetic wave reradiationICT adaptationAerosol extinction coefficientCeilometer
Owner:ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
A Hybrid Expansion Method for Virtual Machine Room
ActiveCN114265671BEnergy efficient computingSoftware simulation/interpretation/emulationCeilometerProcess engineering
Owner:浙江省邮电工程建设有限公司
Cloud Height Measurement Method Based on Two Ground-Based Cloud Images
ActiveCN105783861BImprove calculation accuracyWide coverageHeight/levelling measurementCloud atlasMeasuring instrument
The invention provides a cloud cluster height measuring method based on a dual foundation cloud atlas. The method comprises the following steps: step A, determining the relative distance and relative direction between two imagers; step B, recognizing the identical cloud clusters in the cloud atlases of two imagers and extracting the position information of the identical cloud cluster; step C, determining the height of the cloud cluster based on the position information. According to the measuring method, the observation images of dual foundation cloud imager are used, the same cloud clusters are recognized, the position angles are extracted, and thus the height of the bottom of the cloud clusters above a region can be accurately calculated. Compared with the conventional ceilometer, which can only measure the heights of bottoms of clouds that are right above the ceilometer, the provided method can measure the height of clouds that are right above the imagers and is capable of measuring the height of clouds in other positions in the observation range of the imagers; and the method has the advantages of wide coverage and high calculation precision.
Owner:STATE GRID CORP OF CHINA +1
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