Article
Instruments & Instrumentation
Anand Sankaranarayanan, Umakant Swami, Reshmi Sasidharakurup, Arindrajit Chowdhury, Neeraj Kumbhakarna
Summary: This study demonstrates the potential of using a consumer-grade digital single-lens reflex (DSLR) camera for temperature measurement in sooty flames during transient processes. The color-ratio pyrometry results show a decent match with thermocouple measurements and data reported in the literature.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Biochemical Research Methods
Kolsoum Dalvand, Sepideh Keshan Balavandy, Feng Li, Michael Breadmore, Alireza Ghiasvand
Summary: The recent development of portable 3DP microfluidic devices, combined with smartphone capabilities, has shown great promise for real-time environmental pollutant analysis. These devices can be mass-produced in a short amount of time and have a linear calibration curve for uranium analysis, demonstrating high efficiency.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Michael Vrhel, H. Joel Trussell
Summary: Most digital cameras cannot accurately provide colorimetric information of a scene due to their spectral characteristics. In this research, we extend previous work on using multiple filtered exposures by using online software to create manufacturable filters. We consider multiple criteria in determining the optimal color filter, and our method includes the use of a realistic noise model. We compare two optimization methods and find that filters chosen based on the training dataset consistently outperform theoretical figure of merit (FOM) criteria.
JOURNAL OF ELECTRONIC IMAGING
(2023)
Article
Astronomy & Astrophysics
Sota Nanjo, Yuta Hozumi, Keisuke Hosokawa, Ryuho Kataoka, Yoshizumi Miyoshi, Shin-ichiro Oyama, Mitsunori Ozaki, Kazuo Shiokawa, Satoshi Kurita
Summary: This study investigated the spatial characteristics of pulsating auroras using digital camera measurements from the International Space Station. The results suggest that the periodicity of the main pulsation of a PsA is not dependent on magnetic latitude and MLT, but rather on local conditions. The study also found that the B/G ratios in pulsating auroras can be used as proxies for the energies of PsA electrons, with higher ratios observed in the morning sector.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Chemistry, Analytical
Yasheng Li, Ningfang Liao, Yumei Li, Hongsong Li, Wenmin Wu
Summary: This paper proposes an optimal method for establishing color conversion models for wide-color-gamut cameras, converting the RGB space to the XYZ space of a CIEXYZ system. The method utilizes the Pearson correlation coefficient to evaluate the linear correlation between RGB and XYZ values and obtains a training group with optimal linear correlation. By using this training group, the color conversion models can be established, achieving the desired conversion accuracy in the entire color space. Experimental results show that the color conversion errors can be efficiently reduced by dividing the training groups based on hue angles.
Article
Chemistry, Applied
R. G. Joshi, Deepak K. Gupta, P. Amesh, P. K. Parida, T. R. Ravindran
Summary: Microgel-hydrogel composite photonic crystals were fabricated and their spectroscopic response to uranyl ion in aqueous solution was investigated. The Bragg diffraction peak intensity and shift were found to be affected by the concentration of uranyl ion, with low concentrations causing blue shift and intensity increase, while higher concentrations leading to a red shift. The uranium extraction capacity of the composite photonic crystals was estimated to be 487 mM/kg at pH 5.5, demonstrating the potential of these materials for uranium extraction and detection.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Computer Science, Information Systems
Seokjae Lim, Wonjun Kim
Summary: The paper introduces a novel method for low-light image enhancement by leveraging the useful properties of the Laplacian pyramid in image and feature spaces. The proposed deep stacked Laplacian restorer (DSLR) is capable of separately recovering global illumination and local details and progressively combining them in the image space.
IEEE TRANSACTIONS ON MULTIMEDIA
(2021)
Article
Chemistry, Analytical
Hyeon-Woo Park, Ji-Won Choi, Ji-Young Choi, Kyung-Kwang Joo, Na-Ri Kim
Summary: In this study, a non-linear hue-wavelength (H-W) curve in the range of 400 to 650 nm was investigated using a digital camera with CMOS image sensors. The H-W curve was reconstructed based on RGB-based imaging analysis. Factors such as exposure time and ISO were examined for their effects on the digital image. Laser cross-check of the H-W response was also performed. This method is expected to be a useful auxiliary method for obtaining fluorescence emission wavelength information in the future.
Article
Optics
Yujin Liu, Zhong Ji, Guobiao Cen, Hengchao Sun, Haibao Wang, Chuanxi Zhao, Zhong Lin Wang, Wenjie Mai
Summary: Inspired by human visual cells, researchers developed a high-resolution perovskite-based color camera that uses narrowband red, green, blue, and broadband white perovskite photodetectors as imaging sensors. The red, green, and blue perovskite photodetectors mimic cone cells for color imaging, while the white perovskite photodetector mimics rod cells for weak-light imaging. The camera can capture high-resolution color images in diffuse mode.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Environmental Sciences
Yu Liu, Kenji Hatou, Takanori Aihara, Sakuya Kurose, Tsutomu Akiyama, Yasushi Kohno, Shan Lu, Kenji Omasa
Summary: This study investigates the potential of using UAV mounted with a commercial camera to estimate the SPAD values of naked barley leaves. The results show significant correlations between vegetation indices and SPAD values, with 'G-B' index considered as the most robust for predicting SPAD values. The study highlights the importance of utilizing cheap measurement systems for crop monitoring.
Article
Engineering, Multidisciplinary
N. Iniyan Thiruselvam, S. J. Subramanian
Summary: The research focuses on improving the accuracy of a self-calibrated stereo DIC system for full-field deformation measurements, achieving high-quality imaging results at different viewing angles for reduced measurement errors compared to traditional methods. This study provides valuable insights for enhancing the accuracy and reliability of stereo DIC systems.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Shiyong An, Hongyu Yang, Pei Zhou, Wenfan Xiao, Jiangping Zhu, Yanqiong Guo
Summary: The study proposes an active calibration method to accurately detect the centers of chromatic concentric fringe patterns, which demonstrates robustness to noise and blur, and achieves higher calibration accuracy. Experimental results show that the method can reduce reprojection error by at least 10% in out-of-focus conditions and improve 3D reconstruction accuracy by nearly 10%.
Article
Chemistry, Multidisciplinary
Conrad A. P. Goodwin, Sierra R. Ciccone, Samuel Bekoe, Sourav Majumdar, Brian L. Scott, Joseph W. Ziller, Andrew J. Gaunt, Filipp Furche, William J. Evans
Summary: New coordination environments for Np(III) and Pu(III) are reported based on pilot studies, with U(III) also studied in the same context. Complexes obtained through reactions showed different electron configurations for U(III), Np(III), and Pu(III).
CHEMICAL COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Un Jeong Kim, Suyeon Lee, Hyochul Kim, Yeongeun Roh, Seungju Han, Hojung Kim, Yeonsang Park, Seokin Kim, Myung Jin Chung, Hyungbin Son, Hyuck Choo
Summary: Measuring, recording, and analyzing spectral information of materials as their unique fingerprint using smartphones is desired by scientists and consumers. In this study, we demonstrated drug classification based on chemical components using a smartphone Raman spectrometer. The spectrometer utilizes the smartphone's CMOS image sensor with band pass filters to capture a 2D Raman spectral intensity map, defined as a spectral barcode. With the aid of convolutional neural network (CNN), we achieved a high accuracy of 99.0% in classifying the 11 major components of drugs. The spectral barcodes allow distinguishing even the brand name of a drug and identifying the major component of unknown drugs. By combining spectral barcodes with information obtained from RGB imaging systems or applying image recognition techniques, this labeling system based on inherent properties will facilitate both fundamental research and business opportunities.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Hyeon-Woo Park, Ji-Won Choi, Kyung-Kwang Joo, Na-Ri Kim, Chang-Dong Shin
Summary: This paper presents a practical method using a digital camera to obtain the emission spectra of a fluor in a liquid scintillator (LS). The method proves to be a feasible alternative to traditional, expensive, and complicated fluorescence spectrophotometers, allowing non-invasive measurements of emission wavelengths.
Article
Chemistry, Analytical
Kamesh Viswanathan Baskaran, Guillaume Blanchet-Chouinard, Dominic Lariviere
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2018)
Article
Biology
Kantha Deivi Arunachalam, Kamesh Viswanathan Baskaran, D. D. Rao, R. Sathyapriya, Sathesh Kumar Annamalai, Jaya Krishna Kuruva, Shanmugamsundaram Hari
INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
(2014)
Article
Chemistry, Analytical
R. S. Sathyapriya, Suma Nair, V. Kamesh, R. K. Prabhath, Madhu Nair, R. Acharya, D. D. Rao
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2012)
Article
Chemistry, Analytical
Kamesh Viswanathan Baskaran, Chirayu Desai
Summary: The analysis of hexavalent chromium (Cr (VI)) is crucial for ensuring safe consumption of water. Field examination and low-volume detection are challenging. In this study, we evaluated the use of mobile cameras and spectrophotometers to detect Cr (VI). The results showed that mobile cameras performed better than recent microfluidic and nanotechnology studies. Additionally, the use of one-time color standard references improved the ability to detect Cr (VI) in field analysis.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Kamesh Viswanathan Baskaran
Summary: The study developed a one-time multistandard color chart for quantitating dichlorvos (DDVP) using digital camera based color analysis. The research revealed a linear relation between absorbance spectrophotometer detection and digital camera image analysis at ppb levels, showing the possibility of color analysis by human naked eye judgment as a semi-quantitative strategic approach.
INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY
(2021)
