MMW RADAR

NARL is developing 35 GHz radar in collaboration with ISRO for cloud research application.

RAMAN LIDAR

It is proposed to develop a portable lidar system with scanning capability for profiling atmospheric water vapor and temperature in the height region covering the lower troposphere using Raman scattering technique during clear nighttime conditions. The Raman Effect is the phenomenon of light scattering from a molecular medium. In Raman scattering process, light undergoes a wavelength change (shift) and the scattering molecules undergo an energy change. The spectral shift of the Raman scattered light is uniquely identified with a specific type of molecule and its associated level of excitation. The Raman lidar utilizes the principle by employing transmission of a specific frequency of laser radiation, as a source of excitation, into the atmosphere and collects back the rotational-vibrational returns from the atmospheric constituents like Nitrogen (N2) and Water molecules (H2O) as Raman-shifted frequencies along with elastic lidar signals using an optical receiver like telescope. Wavelength separation and processing of lidar returns allows retrieval of atmospheric properties. Normalization of Raman shifted water vapor signals with that of atmospheric Nitrogen provide a straight forward method of determination of the atmospheric specific humidity. The lidar system will be developed in two phases. In the first phase the water vapor profiling will be attempted and in the second phase temperature profiling of atmosphere will be augmented. It is planned to use the rotational-vibrational Raman technique for water vapor and the pure rotational Raman technique for the atmospheric temperature measurements. The lidar system will make use of 2W class 355 nm laser and employs 350 mm aperture telescope. The proposed lidar system will also be used for aerosol research in characterizing the lidar ratio from Raman and Elastic backscatter profiles. The proposed system planned for development will be for used for nocturnal periods of observation only due to low cross sections of Raman scattering.

TWOCOLORLIDAR

It is proposed to develop a two-wavelength lidar system with capability to profile the atmosphere, atmospheric boundary layer in particular, simultaneously using visible and IR wavelengths for deriving the wavelength dependence of the boundary layer aerosols. The aerosol backscatter cross-section is determined according to physical and chemical properties of the particles (their size, shape and composition) and the laser wavelength. Lidar can be used to measure the vertical distribution of the particle volume extinction and backscatter coefficients. The wavelength dependence of the particle backscatter coefficient is primarily associated with particle size distribution, assuming that the particles are spherical in shape. Atpresent, the IR wavelength is realised and shortly it will be upgraded to visible wavelength.

X-BANDRADAR

It is proposed to develop a two-wavelength lidar system with capability to profile the atmosphere, atmospheric boundary layer in particular, simultaneously using visible and IR wavelengths for deriving the wavelength dependence of the boundary layer aerosols. The aerosol backscatter cross-section is determined according to physical and chemical properties of the particles (their size, shape and composition) and the laser wavelength. Lidar can be used to measure the vertical distribution of the particle volume extinction and backscatter coefficients. The wavelength dependence of the particle backscatter coefficient is primarily associated with particle size distribution, assuming that the particles are spherical in shape. Atpresent, the IR wavelength is realised and shortly it will be upgraded to visible wavelength.

DIALLIDAR

It is proposed to develop a two-wavelength lidar system with capability to profile the atmosphere, atmospheric boundary layer in particular, simultaneously using visible and IR wavelengths for deriving the wavelength dependence of the boundary layer aerosols. The aerosol backscatter cross-section is determined according to physical and chemical properties of the particles (their size, shape and composition) and the laser wavelength. Lidar can be used to measure the vertical distribution of the particle volume extinction and backscatter coefficients. The wavelength dependence of the particle backscatter coefficient is primarily associated with particle size distribution, assuming that the particles are spherical in shape. Atpresent, the IR wavelength is realised and shortly it will be upgraded to visible wavelength.

TETHEREDBALLON

It is proposed to develop a two-wavelength lidar system with capability to profile the atmosphere, atmospheric boundary layer in particular, simultaneously using visible and IR wavelengths for deriving the wavelength dependence of the boundary layer aerosols. The aerosol backscatter cross-section is determined according to physical and chemical properties of the particles (their size, shape and composition) and the laser wavelength. Lidar can be used to measure the vertical distribution of the particle volume extinction and backscatter coefficients. The wavelength dependence of the particle backscatter coefficient is primarily associated with particle size distribution, assuming that the particles are spherical in shape. Atpresent, the IR wavelength is realised and shortly it will be upgraded to visible wavelength.

© 2018 - DevExpress ASP.NET project copyright


© 2018 - DevExpress ASP.NET project copyright


© 2018 - DevExpress ASP.NET project copyright