The measurement range of ceilometer depends both on its optical system characteristics and on the properties of its electronic scheme, including the detector. The optical system of the ceilometer is required to have the lowest possible number of elements and small size. Thus, it appears to be promising to optimize the device characteristics by selecting the detector and the laser characteristics. Signals received in the scheme were compared for two types of photodetector: the first option was the conventional APD detector, and the second one was the HD-SiPM detector. The objective was to study the analog signals for these detectors in a ceilometer that registers the signal backscattered by aerosol. The shape and the features of the signal and the shape of the wavefront registered by these two photodetectors in the scheme are discussed.
The paper discusses the design of the instrument for measuring the cloud lower boundary and describes its testing. The system is based on a coaxial optical scheme. The probing beam and the receiving channel are separated using a folding mirror. The receiving and the transmitting channels are partially combined. The system uses a 905 nm laser diode, with a multimode fiber and collimating optics. The optical scheme is based on refracting optics. The diameter of the receiving aperture is 100 mm. The results of experimental testing of the device under various weather conditions are also presented.
The article considers the features of the optical and fiber-optic schemes of a pulsed coherent Doppler lidar. Two options for the telescope optical scheme design, as well as the use of an optical hybrid to increase the measurement range, are studied. The noise of the measuring system, which is determined by the active and passive components of the system, is analyzed. Experimental results are presented for the scheme with an optical hybrid and a basic scheme, as well as for a telescope based on spherical and aspherical optics.
Wind profiler based on continuous laser source is considers in this work. This lidar allows to measure wind profile up to 300 m altitude. Hardware level signal processing technic is developed by JSC «BANS». Increasing accuracy and speed of wind parameters calculation signal processing technics have been studied in this research. The practice results are presented.
Impulse wind lidar (IWL) signal processing software developed by JSC «BANS» recovers full wind speed vector by radial projections and provides wind parameters information up to 2 km distance. Increasing accuracy and speed of wind parameters calculation signal processing technics have been studied in this research. Measurements results of IWL and continuous scanning lidar were compared. Also, IWL data processing modeling results have been analyzed.
KEYWORDS: LIDAR, Data modeling, Atmospheric modeling, Mathematical modeling, Algorithm development, Atmospheric particles, Data processing, Statistical modeling, Signal processing, Software development
Impulse wind lidar (IWL) signal processing software developed by JSC «BANS» recovers full wind speed vector by radial projections and provides wind parameters information up to 2 km distance. Increasing accuracy and speed of wind parameters calculation signal processing technics have been studied in this research. New double-elevation scan scheme and IWL data processing algorithm was developed and tested on lidar data base obtained during 70 hour atmosphere scan. Also, developed new IWL scanning scheme results were analyzed and compared to classic scheme
Wind profiler based on continuous laser source is considers in this work. This lidar allows to solve the task of wind profile restoration up to 300 m altitude. Hardware level signal processing technic is developed by JSC «BANS». Increasing accuracy and speed of wind parameters calculation signal processing technics have been studied in this research.
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