Prof. Uma Maheswari Rajagopalan Profile

Prof. Uma Maheswari Rajagopalan

at Shibaura Institute of Technology

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 13 March 2024 Poster + Paper

Measurement of optical properties of human skin in the ultraviolet wavelength range: age-related changes

Keita Kojima, Uma Maheswari Rajagopalan, Jun Yamada, Takahiro Kono

Proceedings Volume 12816, 128160G (2024) https://doi.org/10.1117/12.3002738

KEYWORDS: Ultraviolet radiation, Skin, Optical properties, Light scattering, Reflection, Light absorption, Scattering, Photons, Absorption, Optical testing

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Proceedings Article | 22 May 2023 Presentation + Paper

Biospeckle optical coherence tomography reveals the mitigation of the harmful effects of heavy metal zinc in combination with polyethylene microplastics in lentil seeds

Y. Sanath De Silva, Uma Maheswari Rajagopalan, Hirofumi Kadono

Proceedings Volume 12327, 123270P (2023) https://doi.org/10.1117/12.2642702

KEYWORDS: Zinc, Optical coherence tomography, Biospeckle, Polyethylene

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Proceedings Article | 7 March 2023 Presentation + Paper

Laser biospeckle based novel method in the evaluation of far-red light effects on plant growth

Hibiki Igarashi, Kairi Takemura, Takahiro Kono, Hirofumi Kadono, Jun Yamada, Uma Maheswari Rajagopalan

Proceedings Volume 12377, 123770C (2023) https://doi.org/10.1117/12.2649031

KEYWORDS: Biospeckle, Light sources and illumination, Laser irradiation, Biological samples, Speckle pattern, Vacuum chambers, Tissues, Scattered light, Climate change, CMOS cameras

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Proceedings Article | 7 March 2023 Presentation + Paper

Fast and reliable micro-bioassay technique based on biospeckle

Arti Devi, Hirofumi Kadono, Uma Maheswari Rajagopalan

Proceedings Volume 12377, 123770F (2023) https://doi.org/10.1117/12.2651049

KEYWORDS: Biospeckle, Toxicity, Microorganisms, Industrial chemicals, Speckle pattern, Microscopes, Imaging systems, Chemical analysis, CCD cameras, Statistical analysis

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Proceedings Article | 7 March 2023 Presentation + Paper

Monitoring the effects of heavy metal (Cu) on aquatic plant (Myriophyllum) using biospeckle optical coherence tomography and statistical interferometry technique

Zulpikar Muhammat, Hirofumi Kadono, Uma Maheswari Rajagopalan

Proceedings Volume 12377, 123770A (2023) https://doi.org/10.1117/12.2651069

KEYWORDS: Copper, Metals, Optical coherence tomography, Biospeckle, National Ignition Facility, Pigments, Optical sensing, Interferometry, Hydrogen, Computed tomography

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Heavy metals are one of the important components of water pollution. Heavy metals such as copper, zinc and cobalt are essential for the growth of living organisms as micronutrients. However, copper above critical levels can pose serious problems for the environment and human health. The biospeckle observed in OCT have the potential to map dynamic activities inside the plants. We propose biospeckle optical coherence tomography (bOCT) and demonstrate that the technique can monitor biological activity in plants. In bOCT, the temporal speckle contrast variation of the OCT reflection signal is used as a parameter to characterize the internal activities of the aquatic plant (Myriophyllum). Plant stems were observed using the bOCT technique after 7 days of exposure to copper solutions of three different copper concentrations to 0, 30, 100 mg/l. In addition, statistical Interferometry Technique (SIT) system that is also a very sensitive optical measurement technique developed in our lab. SIT enables the direct observation of short-term displacement or extension / shrinkage of plant surface with precision of nanometer scale and on a time scale of seconds. Compared with the bOCT technique, it takes short time. It does not require 7 days of exposure time. In just 3 hours of experiment time, we observed that the plants were receiving heavy metal stress in the copper solution. Under the same heavy metal exposure conditions (7 days), enzyme activities in plants were also measured and analyzed to demonstrate the reliability of our two laser measurement techniques. It can be seen that the increase of copper solution has a significant effect on the activity of plants. It was not possible to observe the effects of 7 days of heavy metal exposure on plants by measuring their length or the color of their leaves. Compared with traditional bioassay methods, SIT technology is the fastest, followed by bOCT technology. Both technologies are advanced and can be used as a new method for the determination of plant bioactivity.

Proceedings Article | 19 May 2022 Presentation + Paper

Biospeckle Optical Coherence Tomography (bOCT) reveals variable effects of acid mine drainage (AMD) on monocot and dicot seed germination

Danyang Li, Uma Maheswari Rajagopalan, Hirofumi Kadono, Yakdehige Sanath Kumara De Silva

Proceedings Volume 12147, 121470D (2022) https://doi.org/10.1117/12.2621440

KEYWORDS: Optical coherence tomography, Mining, Visualization, Superluminescent diodes, Mirrors, Minerals, Mechanical engineering, Environmental sensing, Agriculture

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Proceedings Article | 19 May 2022 Presentation + Paper

Optical screening method to observe the biological activities of lentil (Lens culinaris) seeds quantitatively under the exposure of polyethylene microplastics (PEMPs) using ultrahigh accurate biospeckle optical coherence tomography

Y. Sanath K. De Silva, Uma Maheswari Rajagopalan, Danyang Li, Hirofumi Kadono

Proceedings Volume 12147, 121470C (2022) https://doi.org/10.1117/12.2620176

KEYWORDS: Optical coherence tomography, Visualization, Biomedical optics, Particles, Nondestructive evaluation, In vivo imaging, Ecosystems, Botany, Agriculture, Thin film coatings

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Proceedings Article | 2 March 2022 Poster + Presentation + Paper

Functional optical coherence tomography in the study of plant-sound interactions

Ryotaro Wakumoto, Takahiro Kono, Hirofumi Kadono, Jun Yamada, Uma Maheswari Rajagopalan

Proceedings Volume 11958, 119580G (2022) https://doi.org/10.1117/12.2607538

KEYWORDS: Optical coherence tomography, Scattering, Mirrors, Light scattering, Laser scattering, Mie scattering, Speckle, Reflectivity, Photonics, Tissues

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Proceedings Article | 2 March 2022 Presentation + Paper

Application of laser speckles and deep learning in discrimination of supermicroplastics and zooplanktons

Daiki Endo, Takahiro Kono, Yoshikazu Koike, Hirofumi Kadono, Jun Yamada, Uma Rajagopalan

Proceedings Volume 11950, 1195007 (2022) https://doi.org/10.1117/12.2609366

KEYWORDS: Speckle, Particles, Video, Speckle pattern, Light scattering, Organisms, Statistical analysis, Image classification

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Proceedings Article | 20 February 2020 Paper

Ultrahigh accurate statistical interferometric technique utilizing uniformity of speckle phase in the study of plant physiology

Uma Maheswari Rajagopalan, Hirofumi Kadono, Mahjabin Kabir

Proceedings Volume 11238, 1123815 (2020) https://doi.org/10.1117/12.2543973

KEYWORDS: Speckle, Interferometers, Interferometry, Speckle pattern, Natural surfaces, Laser scattering, Physiology, Light scattering, Environmental sensing

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Proceedings Article | 20 February 2020 Paper

Laser biospeckle metrology in investigating plant-sound interactions

Minoru Hirai, Daiki Endo, Hiroki Gonome, Takahiro Kono, Jun Yamada, Uma Maheswari Rajagopalan

Proceedings Volume 11238, 1123813 (2020) https://doi.org/10.1117/12.2543663

KEYWORDS: Laser metrology, Metrology, Light scattering, Laser applications, Biological research, Light, Tissues, Humidity, Carbon dioxide, Laser scattering

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SPIE Journal Paper | 25 July 2016

Monitoring of growth dynamics of plants under the influence of cadmium using a highly sensitive interferometry technique

Kokge Thilini Kanchana Muthumali De Silva, Uma Maheswari Rajagopalan, Hirofumi Kadono

OE, Vol. 55, Issue 12, 121718, (July 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.12.121718

KEYWORDS: Cadmium, National Ignition Facility, Interferometry, Metals, Speckle, Computed tomography, Optical engineering, Statistical analysis, CCD cameras, Speckle pattern

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Proceedings Article | 17 May 2013 Paper

Optical coherence tomography biospeckle imaging for fast monitoring varying surface responses of a plant leaf under ozone stress

L. K. Srimal, H. Kadono, U. Rajagopalan

Proceedings Volume 8881, 88810H (2013) https://doi.org/10.1117/12.2031062

KEYWORDS: Ozone, Optical coherence tomography, Coherence imaging, Ions, Mirrors, Imaging systems, Data acquisition, Humidity, In vivo imaging, Signal detection

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Proceedings Article | 2 October 2003 Paper

Functional optical coherence tomography to reveal functional architecture of cat visual cortex in vivo

Ryota Homma, Hirofumi Kadono, Manabu Tanifuji, Rajagopalan Uma Maheswari

Proceedings Volume 5140, (2003) https://doi.org/10.1117/12.500567

KEYWORDS: Optical coherence tomography, Brain, Visual cortex, Brain mapping, Neurons, Imaging systems, Optical imaging, In vivo imaging, Neuroimaging, Visualization

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Proceedings Article | 14 June 2002 Paper

Functional imaging of cat primary visual cortex with optical coherence tomography

Uma Rajagopalan, Hideyuki Takaoka, Ryota Homma, Hirofumi Kadono, Manabu Tanifuji

Proceedings Volume 4619, (2002) https://doi.org/10.1117/12.470474

KEYWORDS: Optical coherence tomography, Visual cortex, Functional imaging, Reflectivity, Brain, Scattering, Signal detection, Visualization, Neurons, Mirrors

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Proceedings Article | 19 July 1999 Paper

Optical coherence tomographic imaging system for investigating cortical functional organization of brain: a simulation study

Rajagopalan Maheswari, Hirofumi Kadono, Manabu Tanifuji

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354805

KEYWORDS: Optical coherence tomography, Imaging systems, Neuroimaging, Monte Carlo methods, Particles, Tomography, Brain, Coherence (optics), Iron, Reflectivity

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Proceedings Article | 29 April 1999 Paper

Observation of DNA fixed on a sapphire substrate by a collection mode near-field optical microscope

Uma Rajagopalan, Shuji Mononobe, Kenji Yoshida, Mamoru Yoshimoto, Motoichi Ohtsu

Proceedings Volume 3729, (1999) https://doi.org/10.1117/12.346822

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Proceedings Article | 1 September 1996 Paper

Power spectral analysis for evaluating optical near-field images of 20 nm gold particles

Uma Maheswari R.

Proceedings Volume 2778, 277818 (1996) https://doi.org/10.1117/12.2298926

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Proceedings Article | 30 March 1995 Paper

Imaging experiments of biosamples by a photon scanning tunneling microscope with an apertured probe

Masayuki Naya, Shuji Mononobe, Rajagopalan Maheswari, Toshiharu Saiki, Motoichi Ohtsu

Proceedings Volume 2384, (1995) https://doi.org/10.1117/12.205936

KEYWORDS: Image resolution, Scanning tunneling microscopy, Signal detection, Photonic microstructures, Dielectric polarization, Dielectrics, Gold, Biomedical optics, Light scattering, Glasses

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Proceedings Article | 12 July 1993 Paper

Far-field diffraction patterns of a dot array with Gaussian random fluctuations

Rajagopalan Maheswari, Toshimitsu Asakura, Nobukatsu Takai

Proceedings Volume 1806, (1993) https://doi.org/10.1117/12.147823

KEYWORDS: Far-field diffraction, Photography, Optical computing, Numerical analysis, Diffraction, Modulation, Statistical analysis, Distance measurement, Applied research, Electronics

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Showing 5 of 20 publications

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