All Stories

  1. Reduced-Order Model Enhanced Progressive Domain Adversarial Network: Synthetic-to-Real Ultrasonic Defect Detection Using Fiber Optic Guided Wave Data

    Article • January 2026, Elsevier

    Dr. Nageswara Lalam

  2. Reducing Measurement Uncertainty in Small-Sample Fiber Guided-Wave Defect Measurement via Reduced-Order Modeling and Physically Consistent Signal Adaptation

    Article • January 2026, Elsevier

    Dr. Nageswara Lalam

  3. Location-dependent noise modeling: bridging the gap between simulated and experimental guided wave data in fiber optic pipeline monitoring

    Article • Structural Health Monitoring, November 2025, SAGE Publications

    Dr. Nageswara Lalam

  4. No-Core Fiber Based Multipoint Ultrasonic Acoustic Sensors for Energy Infrastructure Monitoring

    Article • Journal of Lightwave Technology, September 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  5. Domain-adapted deep learning for enhanced pipeline monitoring using guided waves and fiber optic sensing

    Article • May 2025, SPIE

    Dr. Nageswara Lalam

  6. Fusion of experiments and simulations for real-time identification of pipeline defects

    Article • May 2025, SPIE

    Dr. Nageswara Lalam

  7. Numerical investigation of distributed fiber optic sensor installations for flexural guided wave-based NDE

    Article • May 2025, SPIE

    Dr. Nageswara Lalam

  8. Pilot-scale validation of distributed optical fiber sensors for underground pipeline monitoring

    Article • May 2025, SPIE

    Dr. Nageswara Lalam

  9. Efficient signal processing in BOTDA: utilizing PCA and PCA-based neural networks for temperature monitoring

    Article • May 2025, SPIE

    Dr. Nageswara Lalam

  10. Resonant photoacoustic sensors enhanced by differential measurement and multi-pass gas cells for trace methane detection

    Article • May 2025, SPIE

    Dr. Nageswara Lalam

  11. Deep Neural Network Assisted Distributed Strain and Temperature Fiber Sensor System for Natural Gas Pipeline Monitoring

    Article • IEEE Transactions on Instrumentation and Measurement, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  12. Enhancing Machine Learning Models for Guided Wave-Based Pipeline Monitoring: Integrating Experimental Noise Characteristics into Simulation Data for Improved Reliability and Defect Detection

    Article • January 2025, Elsevier

    Dr. Nageswara Lalam

  13. Multiparameter optical fiber sensing for energy infrastructure through nanoscale light–matter interactions: From hardware to software, science to commercial opportunities

    Article • APL Photonics, December 2024, American Institute of Physics

    Yang-Duan Su, Dr. Nageswara Lalam

  14. FiberFlex: FPGA-based Intelligent & Distributed Fiber Sensor System for Pedestrian Recognition

    Article • ACM Transactions on Reconfigurable Technology and Systems, November 2024, ACM (Association for Computing Machinery)

    Dr. Nageswara Lalam, Yuqi Li, Peipei Zhou

  15. Non-destructive pipeline monitoring using intelligent fiber-optic acoustic sensor system

    Article • October 2024, SPIE

    Dr. Nageswara Lalam

  16. Achieving precise multiparameter measurements with distributed optical fiber sensor using wavelength diversity and deep neural networks

    Article • Communications Engineering, August 2024, Springer Science + Business Media

    Dr. Nageswara Lalam

  17. Simulation Analysis of Mode Hopping Impacts on OFDR Sensing Performance

    Article • Photonics, June 2024, MDPI AG

    Dr. Nageswara Lalam

  18. Numerical modeling of cylindrical non-axisymmetric elastic waves for damage detection using fiber optic sensors

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  19. Investigation of data augmentation techniques for ultrasonic acoustic fiber sensing signals in guided wave-based pipeline damage detection

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  20. Distributed optical fiber sensor systems: application to natural gas pipeline monitoring

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  21. Lab scale demonstration of pipeline third-party damage classification using convolutional neural networks

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  22. Petroleum product pipeline monitoring by optical frequency domain reflectometry

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  23. Pipeline damage detection using multimode fiber-optic acoustic sensor and ultrasonic guided waves

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  24. Ultra-long-distance BOTDA sensor system employing hybrid amplification and advanced noise reduction technique

    Article • June 2024, SPIE

    Dr. Nageswara Lalam

  25. Brillouin scattering-based simultaneous and discriminative strain and temperature sensing with double Brillouin peak fibers

    Article • March 2024, SPIE

    Dr. Nageswara Lalam

  26. Multi-parameter distributed fiber sensing system based on hybrid Rayleigh and Brillouin scattering

    Article • March 2024, SPIE

    Dr. Nageswara Lalam

  27. Multi-parameter distributed fiber optic sensing using double-Brillouin peak fiber in Brillouin optical time domain analysis

    Article • Optics Express, October 2023, Optical Society of America (OSA)

    Dr. Nageswara Lalam

  28. Plasmonic and interferometric optical fiber sensors for electrical system monitoring applications

    Article • October 2023, SPIE

    Dr. Nageswara Lalam

  29. Pilot-Scale Testing of Natural Gas Pipeline Monitoring Based on Phase-OTDR and Enhanced Scatter Optical Fiber Cable

    Article • August 2023, Research Square

    Dr. Nageswara Lalam

  30. Pilot-scale testing of natural gas pipeline monitoring based on phase-OTDR and enhanced scatter optical fiber cable

    Article • Scientific Reports, August 2023, Springer Science + Business Media

    Dr. Nageswara Lalam

  31. Robust Vector BOTDA Signal Processing with Probabilistic Machine Learning

    Article • Sensors, June 2023, MDPI AG

    Dr. Nageswara Lalam

  32. Development and pilot-scale demonstration of optical frequency domain reflectometry (OFDR) for gas pipeline monitoring

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  33. Field-testing of water pipeline flow monitoring based on SMS fiber optic acoustic sensor

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  34. High-sensitivity distributed pipelines infrastructure monitoring with internal deployed fibers and Rayleigh enhancement

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  35. Machine learning data analytics based on distributed fiber sensors for pipeline feature detection

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  36. Nuclear canister integrity monitoring using quasi-distributed fiber acoustic sensors and physics-based modeling

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  37. Optimization of the fourth self-imaging spectral response in magnetic fluid cladded-MMI fiber optic sensor for magnetometry

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  38. Strain-free FBG sensors for accurate temperature measurements from cryogenic temperatures to 300 degrees C

    Article • June 2023, SPIE

    Dr. Nageswara Lalam

  39. Quasi-Distributed Fiber Sensor-Based Approach for Pipeline Health Monitoring: Generating and Analyzing Physics-Based Simulation Datasets for Classification

    Article • Sensors, June 2023, MDPI AG

    Dr. Nageswara Lalam

  40. Real-Time Pipe Structure Change Detection and Classification using Distributed Acoustic Fiber Sensors Based on Convolutional Neural Network (CNN) Models

    Article • April 2023, MDPI AG

    Dr. Nageswara Lalam

  41. Vibration Monitoring of Power Transformer based on Ultra-Sensitive Fiber Optic Sensors

    Article • October 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  42. Pipeline monitoring based on ultrasonic guided acoustic wave and fiber optic sensor fusion

    Article • May 2022, SPIE

    Dr. Nageswara Lalam

  43. Robotic fiber optic internal deployment tool for pipeline integrity monitoring

    Article • May 2022, SPIE

    Dr. Nageswara Lalam

  44. Low-cost plasmonic fiber probe and wireless interrogation for electric power equipment temperature sensing

    Article • May 2022, SPIE

    Dr. Nageswara Lalam

  45. Fusion of Distributed Fiber Optic Sensing, Acoustic NDE, and Artificial Intelligence for Infrastructure Monitoring

    Article • January 2022, Optical Society of America (OSA)

    Dr. Nageswara Lalam

  46. Non-invasive pipeline pressure monitoring based on Intrinsic Fabry-Perot interferometers

    Article • January 2022, Optical Society of America (OSA)

    Dr. Nageswara Lalam

  47. Recent Advances in Machine Learning for Fiber Optic Sensor Applications

    Article • Advanced Intelligent Systems, October 2021, Wiley

    Dr. Nageswara Lalam

  48. Performance improvement of phase-optical time domain reflectometry (Φ-OTDR) based on wavelength diversity technique

    Article • April 2021, SPIE

    Dr. Nageswara Lalam

  49. Pipeline Monitoring Using Highly Sensitive Vibration Sensor Based on Fiber Ring Cavity Laser

    Article • Sensors, March 2021, MDPI AG

    Dr. Nageswara Lalam

  50. Probabilistic deep neural network based signal processing for Brillouin gain and phase spectrums of vector BOTDA system

    Article • March 2021, SPIE

    Dr. Nageswara Lalam

  51. Phase-Sensitive Optical Time Domain Reflectometry With Rayleigh Enhanced Optical Fiber

    Article • IEEE Access, January 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  52. Distributed carbon dioxide sensor based on sol-gel silica-coated fiber and optical frequency domain reflectometry (OFDR)

    Article • August 2020, SPIE

    Dr. Nageswara Lalam

  53. Recent development in artificial neural network based distributed fiber optic sensors

    Article • July 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  54. Raman-assisted BOTDA performance improvement with the differential pulse-width pair technique and an artificial neural network based fitting algorithm

    Article • April 2020, SPIE

    Dr. Nageswara Lalam

  55. Integrating Radio-Over-Fiber Communication System and BOTDR Sensor System

    Article • Sensors, April 2020, MDPI AG

    Dr. Nageswara Lalam

  56. Phase-optical time domain reflectometry ([theta]-OTDR) with enhanced performance

    Article • March 2020, SPIE

    Dr. Nageswara Lalam

  57. Measurement of CO2 and Ultrasonic Vibration Based on Tunable Fiber Ring Laser

    Article • IEEE Access, January 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  58. Distributed optical fiber sensing: Review and perspective

    Article • Applied Physics Reviews, September 2019, American Institute of Physics

    Dr. Nageswara Lalam

  59. Enhanced performance of Brillouin distributed fiber sensor with hybrid amplification

    Article • May 2019, SPIE

    Dr. Nageswara Lalam

  60. Vector Brillouin optical time-domain analysis with Raman amplification and optical pulse coding

    Article • March 2019, SPIE

    Dr. Nageswara Lalam

  61. A simple all-fiber comb filter based on the combined effect of multimode interference and Mach-Zehnder interferometer

    Article • Scientific Reports, August 2018, Springer Science + Business Media

    Dr. Nageswara Lalam

  62. Multi point strain and temperature sensing based on Brillouin optical time domain reflectometry

    Article • July 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  63. Performance Improvement of Brillouin Ring Laser Based BOTDR System Employing a Wavelength Diversity Technique

    Article • Journal of Lightwave Technology, February 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  64. Performance analysis of Brillouin optical time domain reflectometry (BOTDR) employing wavelength diversity and passive depolarizer techniques

    Article • Measurement Science and Technology, January 2018, Institute of Physics Publishing

    Dr. Nageswara Lalam

  65. Sensing range improvement of brillouin optical time domain reflectometry (BOTDR) using inline erbium-doped fibre amplifier

    Article • October 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  66. Performance improvement of Brillouin based distributed fiber sensors employing wavelength diversity techniques (Invited Paper)

    Article • August 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  67. High Sensitivity Refractometer Based on Reflective Smf-Small Diameter No Core Fiber Structure

    Article • Sensors, June 2017, MDPI AG

    Dr. Nageswara Lalam

  68. Performance improvement of BOTDR system using wavelength diversity technique

    Article • April 2017, SPIE

    Dr. Nageswara Lalam

  69. Future of distributed fiber sensors (invited paper)

    Article • September 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  70. Perfluorinated polymer optical fiber for precision strain sensing based on novel SMS fiber structure

    Article • July 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  71. Analysis of Brillouin Frequency Shift in Distributed Optical Fiber Sensor System for Strain and Temperature Monitoring

    Article • January 2016, Scitepress

    Dr. Nageswara Lalam

  72. Employing wavelength diversity technique to enhance the Brillouin gain response in BOTDA system

    Article • January 2016, Optical Society of America (OSA)

    Dr. Nageswara Lalam

  73. Experimental analysis of EVM and BER for indoor radio-over-fibre networks using polymer optical fibre

    Article • June 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Professor Zabih Ghassemlooy, Dr. Nageswara Lalam

  74. Characterization of Brillouin frequency shift in Brillouin Optical Time Domain Analysis (BOTDA)

    Article • June 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Nageswara Lalam

  75. A quantitative approach for polymerase chain reactions based on a hidden Markov model

    Article • Journal of Mathematical Biology, December 2008, Springer Science + Business Media

    Dr. Nageswara Lalam

  76. Bayesian Estimation for Quantification by Real-time Polymerase Chain Reaction Under a Branching Process Model of the DNA Molecules Amplification Process

    Article • Mathematical Population Studies, April 2007, Taylor & Francis

    Dr. Nageswara Lalam

  77. Estimation of the reaction efficiency in polymerase chain reaction

    Article • Journal of Theoretical Biology, October 2006, Elsevier

    Dr. Nageswara Lalam

  78. Estimation of the PCR efficiency based on a size-dependent modelling of the amplification process

    Article • Comptes Rendus Mathématique, October 2005, Cellule MathDoc/CEDRAM

    Dr. Nageswara Lalam

  79. Estimation of the offspring mean of a supercritical or near-critical size-dependent branching process

    Article • Comptes Rendus Mathématique, October 2004, Cellule MathDoc/CEDRAM

    Dr. Nageswara Lalam

  80. Estimation of the offspring mean in a supercritical or near-critical size-dependent branching process

    Article • Advances in Applied Probability, June 2004, Cambridge University Press

    Dr. Nageswara Lalam

  81. Modelling the PCR amplification process by a size-dependent branching process and estimation of the efficiency

    Article • Advances in Applied Probability, June 2004, Cambridge University Press

    Dr. Nageswara Lalam

  82. Risk factors associated with drug use: the importance of ‘risk environment’

    Article • Drugs Education Prevention and Policy, November 2003, Taylor & Francis

    Dr. Nageswara Lalam