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Measurement of Temperature and Temperature Fluctuation of a Gaseous Flame Using Double and Single Exposure Speckle Photography

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Journal of Optics (India) 2001年第1期30卷 19-28页

作者： Thakur, Madhuri Vats, Ruchi Rathi, Vikas Angra, S.K. Laser Application and Holography Laboratory Instrument Design Development Centre Indian Institute of Technology New Delhi110 016 India Central Scientific Instruments Organization Chandigarh India

Measurement of accurate spatial distribution of temperature and temperature fluctuation in a flame is important to study the combustion process in detail. In this paper first we have presented measurement of temperature profile of a gaseous flame of a two-dimensional slot burner. The errors due to halo effect in the measurements of temperature are minimized by correcting the width of the fringes. Further single exposure speckle photography is used to study temperature fluctuation inside the flame. The 3-D plot of temperature fluctuation for different fuel flow rates of air and acetylene at different vertical heights above the mouth of the burner with distance from the one end of the burner is also presented. © 2001, Optical Society of India.

关键词： Temperature distribution

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An efficient RF tracking technique with spread spectrum signal at sensitivity level 14

An efficient RF tracking technique with spread spectrum sign...

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14th IEEE India Council International Conference, INDICON 2017

作者： Verma, Tarun Kumar Pathak, Nagendra Prasad Defence Electronics Application Laboratory Defence Research and Development Organization Dehradun India Electronics and Communication Engineering Indian Institute of Technology Roorkee Roorkee India

ISBN: (纸本)9781538643181

A compact and novel circuit is presented for quickly tracking the moving target to provide uninterrupted communication between ground station and moving target. The key feature of the proposed circuit is the mono-pulse tracking technique of ground antenna with spread spectrum signal at sensitivity level. The circuit insures the sensitivity of tracking chain is better than the telemetry (Data) chain so that the ground tracking antenna will acquire quickly the moving target. The proposed topologies work well for Spread Spectrum transmitted signal (SS) and provide sufficient anti-jam margin in tracking chain also. The same circuit is also very useful when transmitted signal uses code division multiple access (CDMA) technique. In such techniques signal from one transmitter appear as a strong interferer for other transmitter. Propose topology insure that transmitted signal from our own other moving platform will not confuse the ground tracking antenna and break the communication link. In this way efficient frequency spectrum utilization is possible even for the links between moving platform and stationary ground stations. The proposed scheme is having potential for integration with the entire conventional tracking scheme such as monopulse, conical scanning and electronic scanning. It is an added advantages moving towards advance spread spectrum microwave unified telemetry tracking and control systems (MUTTCS). © 2017 IEEE.

关键词： Transmitters

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THE PROSPECTS AND RETROSPECTS OF THE UNITED-NATIONS-CONFERENCE-ON-SCIENCE-AND-technology-FOR-development

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technology IN SOCIETY 1979年第4期1卷 353-386页

作者： STANDKE, KH Klaus-Heinrich Standke is Director of the United Nations Office for Science and Technology and also serves as Secretary of the UN Advisory Committee on the Application of Science and Technology to Development (ACAST) and the UN Scientific Advisory Committee (SAC). Formerly Counsellor to the Directorate for Scientific Affairs Organization for Economic Cooperation and Development Paris France

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Electric Field Reconstruction Using Block Spatial Model-Based Parameter Estimation 8

Electric Field Reconstruction Using Block Spatial Model-Base...

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8th Asia-Pacific Conference on Antennas and Propagation, APCAP 2019

作者： Zhang, Shuming Yao, Junyi Li, Baozhu Lu, Huali Tang, Wanchun Nanjing Normal University School of Physics and Technology Line 2-name of Organization Acronyms Acceptable Nanjing China Jiangsu Ctr. for Collab. Innovation in Geographical Information Resource Development and Application Jiangsu Province Engineerings Laboratory of Audio Technology Nanjing China

ISBN: (纸本)9781665400541

This paper proposes a block spatial model-based parameter estimation (B-SMBPE) method to reconstruct the electric field with a few of measurements. The block process allows B-SMBPE to keep the good curve fitting characteristics of MBPE in densely sampled spatial field. The simulation result shows that the signal-to-error ratio (SER) of B-SMBPE reconstruction is approximately 22.17dB when only 9% of the total points are selected over a 1000m×1000m rough terrain. © 2019 IEEE.

关键词： Electric fields

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Determining tree height and width using GPS-enabled UAV imagery 2

Determining tree height and width using GPS-enabled UAV imag...

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2nd International Conference on Signal and Information Processing, IConSIP 2022

作者： Halder, Tamesh Dutta, Arnab Biswas, Kousik Gayen, Rintu Kumar Ray, Arundhati Mishra Chakravarty, Debashish Indian Institute of Technology Department of Mining Engineering Kharagpur India Telecommunication Engineering Iiest Dept. of Electronics Shibpur India Advanced Technology Development Centre IIT Kharagpur India Institute of Engineering & Management Department of Electronics and Communications Engineering Kolkata India Space Application Center Indian Space Research Organization Ahmedabad India

ISBN: (纸本)9781728168852

The Canopy Height Model (CHM) is very popular in remote sensing and agroforestry domains to calculate height. But often, we miss the width of the canopies as well for urban structure width. If we already have GPS-enabled unmanned aerial vehicle (UAV) images, we can detect height and width using just the Agisoft point cloud model. The width information has not been calculated to any geoscience software according to the author's knowledge. We are the first to detect width information with the height information of a structure. The structure may be the building or natural construction or the wood log of the forest. Hence, this study benefits agroforestry, urban classification and planning, and geoscience studies' biomass and carbon content. © 2022 IEEE.

关键词： Antennas

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On the selection of Radiating Elements for Electronically Steered Phased Array Antenna for SATCOM applications

On the selection of Radiating Elements for Electronically St...

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IEEE India Council International Conference

作者： Raj Kumar M. V. Kartikeyan Defence Electronics Application Laboratory (DEAL) Defence Research Development Organization (DRDO) Department of Electronics & Communication Engineering Indian Institute of Technology Roorkee

ISBN: (纸本)9781538643198

Radiating element plays very important role in deciding the performance of electronically steered phased array antenna (ESPAA). It, not only receives the signal radiated but it's performance also decides the beam steering angles from boresight. For satellite communication, the beam steering required is much larger than that for radar applications. To cover complete Indian region the beam needs to steer at least ± 45 degree from bore sight. Present paper details the selection criteria of radiating elements and it's parameters for electronically steered phased array antenna for SATCOM applications. All the parameters of radiating element viz. beamwidth, bandwidth, polarization etc., affecting the performance of the phased array antenna system for SATCOM applications have been discussed in detail. The paper also describes realization of 1×32 radiating array for active phased array antenna. The simulation of the antenna has been done on ANSYS HFSS EM simulation software using proper boundary conditions. The measured results of the antenna are in excellent compliance with the simulated results.

关键词： Antenna array Active VSWR Beam steering Beamwidth Bandwidth Mutual coupling Scan loss

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An efficient RF tracking technique with spread spectrum signal at sensitivity level

An efficient RF tracking technique with spread spectrum sign...

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IEEE India Conference (INDICON)

作者： Tarun Kumar Verma Nagendra Prasad Pathak Defence Electronics Application Laboratory Defence Research and Development Organization Dehradun India Electronics and Communication Engineering Indian Institute of Technology Roorkee Roorkee India

关键词： Target tracking Band-pass filters Feeds Sensitivity Frequency conversion Radio frequency

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Techniques of Reconfigurable Bandpass Filter For Realization of Adaptable RF System and Proposed Methodology

Techniques of Reconfigurable Bandpass Filter For Realization...

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IEEE India Conference (INDICON)

作者： Gaurav Mittal Nagendra Prasad Pathak Defence Electronics Application Laboratory (DEAL) Defence Research & Development Organization (DRDO) Dehradun India Electronics & Communication Engineering Department Indian Institute of Technology (IIT) Roorkee India

This paper include state-of-art in the study of reconfigurable bandpass filter design for engineering design problems of adaptable RF system. The paper delivers knowledge of reconfigurable bandpass filter to tackle with wide range of complex systems in microwave domain for which traditional techniques are inadequate. This paper investigates various technologies which are used in reconfigurable bandpass filter. In this paper, based on coupling coefficient and Spoof Surface Plasmon Polaritons (SSPPs) phenomenon, a dual - band bandpass (BPF) filter is proposed. The realized filter gives dual - band BPF characteristics at C-Band (6.0-6.80GHz) and X-Band (7.80-8.40 GHz) concurrently. The insertion loss for both the band is less than 2.5 dB.

关键词： Band-pass filters Microwave filters Resonator filters Couplings Filtering theory Transmission line matrix methods

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Design and development of Tunable Bandpass Filter at Microwave Frequency Using Plasmonic Metamaterial Based Ring Resonator Structure

Design and Development of Tunable Bandpass Filter at Microwa...

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Microwaves Antennas and Propagation Conference (MAPCON)

作者： Gaurav Mittal Nagendra Prasad Pathak Defence Electronics Application Laboratory (DEAL) Defence Research & Development Organization(DRDO) Dehradun India Department of Electronics & Communication Engg. (ECE) Indian Institute of Technology(IIT) Roorkee India

As compared to the current 4G mobile technology, a higher bandwidth and a lower latency will be provided by 5G and beyond technologies, which is planned to be deployed in 2020-2030, providing connectivity to billions of devices and enabling bandwidth with more than hundreds of megabits per second and very low latency less than 1 millisecond (ms). The tunable wideband RF system is essential part for realization of above mentioned technology in which tunable Band Pass Filter (BPF) is important microwave component. The tunable filter with variable frequency response is designed by altering of the electrical path of the mode current. Spoof surface Plasmon Polaritons (SSPPs) based BPF structure are the artificial engineered material-based design. This is trend towards of Microwave Photonics or Metamaterial Physics to application of tunable Bandpass Filter at Microwave Frequency. The paper comprises of corrugated ring resonator SSPP structure with tuning capability using novel approach at Microwave *** corrugated ring resonator-based bandpass filter show octave bandwidth i.e. the 3 dB passband is achieved between 3. 5-7.0 GHz. The varactor tuned corrugated ring resonator is shown to achieve electronically tunable BPF.

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Control system for reactor vessel inspection manipulator

Control system for reactor vessel inspection manipulator

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IEEE Conference on Control technology and applications (CCTA)

作者： Alan Mutka Ivica Draganjac Zdenko Kovacic Zeljko Postruzin Ranko Munk Faculty of EE&C Department of Control and Computer Engineering LARICS-Laboratory of Robotics and Intelligent Control Systems University of Zagreb Zagreb Croatia Organization of Technology Development and Application HRID Limited Zagreb Croatia

In this paper a system for control and 3D visualization of a manipulator for weld inspection of nuclear reactor vessels is described. Based on client-server TCP/IP software architecture, the presented control system enables an operator to perform the entire inspection procedure remotely over a network, avoiding exposure to dangerous radiation which is commonly present in nuclear reactor environments. The developed graphical user interface provides all necessary tools needed for planning robot scan trajectories, their verification on a virtual 3D model and execution on a remote robot. In addition, the weld inspection process can be observed in parallel on a virtual robot and reactor vessel model and on live video streams captured by two special cameras mounted on the robot.

关键词： Control systems Inductors Inspection Welding Parallel robots Visualization TCPIP Software architecture Graphical user interfaces Trajectory

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