Dr. Bhavani Kumar Yellapragada Profile

Dr. Bhavani Kumar Yellapragada

Project Leader, LIDAR at National Atmospheric Research Lab

SPIE Involvement:

Author

Area of Expertise:

LIDAR instrument development , Development of algorithms for atmospheric parameters from lidar data , Teaching atmospheric LIDAR techniques to students/faculty

Profile Summary

Dr Bhavani Kumar Yellapragada is presently working as Project leader for LIDAR at National Atmospheric Research Laboratory (NARL), ISRO in India. Dr Kumar has made significant contribution in the development of technologies related to laser remote sensing instrumentation for environmental research in India namely a boundary layer micro pulse lidar, Dual polarization lidar, Raman lidar and resonance lidar, which are capable of characterizing atmospheric boundary layer dynamics, aerosol particles, clouds, water vapor and mesospheric Sodium layer. Recently his works were recognized by ISRO and conferred with ISRO's prestigious Merit award. He published more than 100 publications Currently he is listed as expert under VIDWAN, an MHRD initiative of Government of India. He is an elected senior member of IEEE. He is also life member of ISRS, ASI add ISOI . He is a Fellow of Earth Science Society (SES) of India. He has guided more than 18 M.Tech Students in LIDAR remote sensing area and presently guiding two Ph.D students on LIDAR related research. Recently he demonstrated an aerosol lidar working in daylight hours with polarization capability. He also developed a novel 1064 nm lidar for cloud and rain studies at NARL site.

Publications (19)

Proceedings Article | 12 November 2019 Paper

Paper

Single detector polarization lidar for atmospheric studies

Mohammed Sharukh, Bhavani Kumar Yellapragada, Rafiq Ayub

Proc. SPIE. 11197, SPIE Future Sensing Technologies

KEYWORDS: Prisms, Polarization, LIDAR, Sensors, Satellites, Receivers, Polarizers, Clouds, Signal processing, Atmospheric sensing

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SPIE Journal Paper | 6 June 2019

Investigation on the performance of Levinson recursion algorithm-based Wiener filter in gluing ground-based lidar signals

Natarajan Sangeetha Kalaivasan, Valarmathi Jayaraman, Bhavani Kumar Yellapragada, Sivabalan Sivaraj

OE Vol. 58 Issue 06

KEYWORDS: LIDAR, Analog electronics, Signal detection, Nitrogen, Filtering (signal processing), Raman spectroscopy, Photon counting, Signal processing, Telescopes, Sensors

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Proceedings Article | 5 May 2016 Paper

Paper

Lidar measurements of tropical cirrus during monsoon period

Subhajit Roy, Bhavani Kumar Y., M. V. Murti

Proc. SPIE. 9879, Lidar Remote Sensing for Environmental Monitoring XV

KEYWORDS: Telescopes, Photon counting, Atmospheric laser remote sensing, Backscatter, LIDAR, Aerosols, Satellites, Particles, Molecules, Clouds, Atmospheric sensing, Atmospheric monitoring, Climatology, Atmospheric particles

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Proceedings Article | 5 May 2016 Paper

Paper

Measurements of long range transport using two wavelength and polarization lidar over tropical rural site Gadanki (13.450 N, 79.170 E)

Vishnu R., Y. Bhavani Kumar, E. James Jebaseelan Samuel

Proc. SPIE. 9879, Lidar Remote Sensing for Environmental Monitoring XV

KEYWORDS: Telescopes, Mirrors, MODIS, Polarization, Backscatter, LIDAR, Aerosols, Particles, Nd:YAG lasers, Clouds, Mass attenuation coefficient, Signal detection, Atmospheric monitoring, Atmospheric particles

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Proceedings Article | 5 May 2016 Paper

Paper

Lidar measurements of aerosol at Varanasi (25.28 N, 82.96 E), India during CAIPEEX scientific campaign

R. Vishnu, Y. Bhavani Kumar, Y. Jaya Rao, E. James Samuel, P. Thara, A. Jayaraman

Proc. SPIE. 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI

KEYWORDS: Transmitters, Telescopes, MODIS, Atmospheric laser remote sensing, Polarization, Backscatter, LIDAR, Aerosols, Satellites, Remote sensing, Receivers, Clouds, Atmospheric particles, Atmospheric modeling

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A compact dual polarization lidar (DPL) was designed and developed at National Atmospheric Research Laboratory (NARL) for daytime measurements of the boundary layer aerosol distribution and depolarization properties with very high vertical and temporal resolution. The lidar employs a compact flashlamp pumped Q-switched Nd:YAG laser and operates at 532 nm wavelength. The lidar system uses a stable biaxial configuration between transmitter and receiver units. The receiver utilizes a 150 mm Schmidt Cassegranin telescope for collecting laser returns from the atmosphere. The collected backscattered light is separated into co and cross-polarization signals using a polarization beam splitter cube. A set of mini-PMTs have been used for detection of light from atmosphere during daylight period. A two channel transient recorder system with built-in ADC has been employed for recording the detected light. The entire lidar system is housed in a compact cabinet which can be easily transported for field measurements. During 2014, the lidar system was installed at the Banaras Hindu University (BHU) campus, Varanasi (25.28° N, 82.96° E, 82 m AMSL) and operated for a period of three months in to support the cloud aerosol interaction and precipitation enhancement experiment (CAIPEEX) conducted by Indian Institute of tropical meteorology (IITM). During this campaign period, the lidar measurements were carried out in the vertical direction with spatial resolution of 7.5 m and time sampling of 30s. The lidar measurements revealed the occurrence of boundary layer growth during convective periods and also detected the long-range transport dust layers with significant depolarization. In the present paper, we present the lidar measurements obtained during the campaign period and discuss the observation of transport of dust layer over the experimental site with support of back trajectory analysis and satellite data. The Lidar observations were compared with the available satellite observations also presented here.

Proceedings Article | 5 May 2016 Paper

Paper

Retrieval of mixed layer height (MLH) from lidar using analytical methods and estimation of MLH growth rates over a tropical site Gadanki

Vishnu R., Bhavani Kumar Y., P. R. Sinha, Narayana Rao T., James Jebaseelan Samuel E.

Proc. SPIE. 9879, Lidar Remote Sensing for Environmental Monitoring XV

KEYWORDS: Signal to noise ratio, Backscatter, LIDAR, Aerosols, Wavelets, Laser development, Interference (communication), Signal processing, YAG lasers, Analytical research, Neodymium, Signal detection, Atmospheric sensing, Testing and analysis, Atmospheric particles

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Proceedings Article | 5 May 2016 Paper

Paper

Lidar research activities and observations at NARL site, Gadanki, India

Bhavani Kumar Yellapragada

Proc. SPIE. 9879, Lidar Remote Sensing for Environmental Monitoring XV

KEYWORDS: Transmitters, Polarization, Backscatter, LIDAR, Aerosols, Remote sensing, Receivers, Clouds, Raman spectroscopy, Analytical research, Atmospheric sensing, Atmospheric particles

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The National Atmospheric Research Laboratory (NARL), a unit of Department of Space (DOS), located at Gadanki village (13.5°N, 79.2°E, 370 m AMSL) in India, is involved in the development of lidar remote sensing technologies for atmospheric research. Several advanced lidar technologies employing micropulse, polarization, Raman and scanning have been developed at this site and demonstrated for atmospheric studies during the period between 2008 and 2015. The technology of micropulse lidar, operates at 532 nm wavelength, was successfully transferred to an industry and the commercial version has been identified for Indian Lidar network (I-LINK) programme. Under this lidar network activity, several lidar units were installed at different locations in India to study tropospheric aerosols and clouds. The polarization sensitive lidar technology was realized using a set of mini photomultiplier tube (PMT) units and has the capability to operate during day and night without a pause. The lidar technology uses a compact flashlamp pumped Qswitched laser and employs biaxial configuration between the transmitter and receiver units. The lidar technology has been utilized for understanding the polarization characteristics of boundary layer aerosols during the mixed layer development. The demonstrated Raman lidar technology, uses the third harmonic wavelength of Nd:YAG laser, provides the altitude profiles of aerosol backscattering, extinction and water vapor covering the boundary layer range and allows operation during nocturnal periods. The Raman lidar derived height profiles of aerosol backscattering and extinction coefficient, lidar ratio, and watervapor mixing ratio inform the tropical boundary layer aerosol characteristics. The scanning lidar technology uses a near infrared laser wavelength for probing the lower atmosphere and has been utilized for high resolution cloud profiling during convective periods. The lidar technology is also used for rain rate measurement during small scale rain periods over the tropical station, Gadanki. This paper describes the lidar technologies developed and observations conducted using the technologies demonstrated.

Proceedings Article | 5 May 2016 Paper

Paper

Design of a fused optical fibre bundle-based receiver for low-altitude profiling of water vapour using Raman lidar

Sangeetha N., Bhavani Kumar Yellapragada, Venkata Rajanikanth Machavaram

Proc. SPIE. 9879, Lidar Remote Sensing for Environmental Monitoring XV

KEYWORDS: Optical fibers, Telescopes, Mirrors, Cladding, LIDAR, Glasses, Receivers, Raman spectroscopy, Profiling, Analytical research

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Proceedings Article | 5 May 2016 Paper

Paper

Development of lidar sensor for cloud-based measurements during convective conditions

R. Vishnu, Y. Bhavani Kumar, T. Narayana Rao, Anish Kumar Nair, A. Jayaraman

Proc. SPIE. 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI

KEYWORDS: Atmospheric laser remote sensing, Backscatter, LIDAR, Sensors, Aerosols, Remote sensing, Clouds, Convection, Atmospheric sensing, Atmospheric particles

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SPIE Journal Paper | 1 August 2007

Resonance lidar system for mesospheric sodium measurements

Bhavani Kumar, D. Narayana Rao, M. Sundara Murthy, M. Krishnaiah

OE Vol. 46 Issue 08

KEYWORDS: Sodium, LIDAR, Photons, Chemical species, Dye lasers, Backscatter, Scattering, Optical engineering, Laser scattering, Wave propagation

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Proceedings Article | 12 December 2006 Paper

Paper

Lidar observations of sporadic Na layers over Gadanki (13.5° N, 79.2° E)

P. Vishnu Prasanth, Y. Bhavani Kumar, D. Narayana Rao

Proc. SPIE. 6409, Lidar Remote Sensing for Environmental Monitoring VII

KEYWORDS: Atmospheric laser remote sensing, Einsteinium, LIDAR, Solid state lighting, Dye lasers, Sodium, Atmospheric sensing, Atmospheric particles, Atmospheric chemistry, Astatine

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Proceedings Article | 12 December 2006 Paper

Paper

Diurnal variation of boundary layer using different methods

V. Murty, Ugendar Kodam, Kumar Bhavani, Rao Narayana

Proc. SPIE. 6409, Lidar Remote Sensing for Environmental Monitoring VII

KEYWORDS: Backscatter, Scattering, LIDAR, Signal attenuation, Aerosols, Laser scattering, Interference (communication), Optical inspection, Mie scattering, Atmospheric optics

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Proceedings Article | 12 December 2006 Paper

Paper

A portable lidar system for atmospheric aerosol and cloud studies

Bhavani Kumar Yellapragada

Proc. SPIE. 6409, Lidar Remote Sensing for Environmental Monitoring VII

KEYWORDS: Telescopes, LIDAR, Aerosols, Clouds, Profiling, Analytical research, Earth's atmosphere, Atmospheric sensing, Atmospheric monitoring, Atmospheric particles

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Proceedings Article | 12 December 2006 Paper

Paper

Lidar observation of gravity wave characteristics in the tropical middle atmosphere

Maria Antonita T, Geetha Ramkumar, Bhavani Kumar, D. Rao

Proc. SPIE. 6409, Lidar Remote Sensing for Environmental Monitoring VII

KEYWORDS: Radar, Rockets, LIDAR, Wavelets, Error analysis, Wave propagation, Wind energy, Convection, Atmospheric propagation, Atmospheric monitoring

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Proceedings Article | 8 December 2006 Paper

Paper

Cirrus observations using ground-based LIDAR and Terra MODIS instrument

Padmavati Kulkarni, Y. Bhavani Kumar, P. Vishnu Prasanth, D. Narayana Rao, M. Krishniah

Proc. SPIE. 6408, Remote Sensing of the Atmosphere and Clouds

KEYWORDS: Beam splitters, MODIS, LIDAR, Satellites, Reflectivity, Clouds, Analytical research, Space operations, Climatology, Environmental sensing

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SPIE Journal Paper | 1 July 2006

Portable lidar system for atmospheric boundary layer measurements

Bhavani Kumar

OE Vol. 45 Issue 07

KEYWORDS: LIDAR, Atmospheric particles, Backscatter, Aerosols, Pulsed laser operation, Telescopes, Atmospheric monitoring, Atmospheric optics, Laser energy, Photodetectors

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Proceedings Article | 12 January 2005 Paper

Paper

Raman lidar observations of height profiles of upper troposphere and lower stratosphere temperature over the tropical site Gadanki

Yellapragada Bhavani Kumar, Kohei Mizutani

Proc. SPIE. 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V

KEYWORDS: Data modeling, Backscatter, LIDAR, Aerosols, Nitrogen, Raman spectroscopy, Stratosphere, Troposphere, Atmospheric particles, Atmospheric modeling

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Proceedings Article | 12 January 2005 Paper

Paper

Backscatter lidar observations of lower atmospheric aerosol during daytime over the tropical rural site Gadanki

Yellapragada Bhavani Kumar, Kohei Mizutani

Proc. SPIE. 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V

KEYWORDS: Telescopes, Photon counting, Backscatter, LIDAR, Signal attenuation, Aerosols, Mass attenuation coefficient, Troposphere, Atmospheric particles, Atmospheric modeling

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Proceedings Article | 9 January 2002 Paper

Paper

Rayleigh lidar observations of gravity wave characteristics in the middle atmosphere at Gadanki, India (13.5 degrees N, 79.2 degreesE.)

K. Parameswaran, K. Rajeev, M. Sasi, Geetha Ramkumar, B. Krishna Murthy, K. Satheesan, A. Jain, Y. Bhavanikumar, Kalavai Raghunath, M. Krishnaiah

Proc. SPIE. 4484, Lidar Remote Sensing for Industry and Environment Monitoring II

KEYWORDS: Radar, Rockets, Modulation, LIDAR, Error analysis, Wave propagation, Wind energy, Mesosphere, Stratosphere, Atmospheric propagation

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Showing 5 of 19 publications

Conference Committee Involvement (3)

Lidar Remote Sensing for Environmental Monitoring XVII

18 April 2022 | Yokohama, Japan

Lidar Remote Sensing for Environmental Monitoring XVI

24 September 2018 | Honolulu, Hawaii, United States

Lidar Remote Sensing for Environmental Monitoring XV

4 April 2016 | New Delhi, India

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