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Time-series InSAR measurement using ICOPS and estimation of along-track surface deformation using MAI during the 2021 eruption of Fagradalsfjall Volcano, Iceland.
Sci Rep
December 2024
Department of Science Education, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, 24341, Gangwon-do, Republic of Korea.
The eruption in Fagradalsfjall Volcano, located in Reykjanes Peninsula, Iceland, from several centuries' dormant states, occurred for the first time on March 19, 2021. Observations of Fagradalsfjall Volcano were conducted in 2021, and the eruption period lasted for six months until 18 September 2021. Six days pair of interferograms were generated from ninety synthetic aperture radar (SAR) data.
View Article and Find Full Text PDFSymmetric Non-Monochromatic Light as Reference in Fourier Transform Spectrometers.
Appl Spectrosc
December 2024
Department of Physics, Bernal Institute, University of Limerick, Limerick, Ireland.
Fourier transform spectrometers typically use a presumed monochromatic reference source to track and correct errors in optical path difference changes. This paper will conduct a theoretical analysis to show that non-monochromatic light sources with symmetric spectral profiles can also be used as reference sources without adding errors. An experiment was carried out using a symmetric broadband superluminescent diode (SLED) as reference light to measure the spectrum of some other SLED light sources to experimentally demonstrate this finding.
View Article and Find Full Text PDFClassification of commercial plastics using hyperspectral long wave infrared emission imaging.
Spectrochim Acta A Mol Biomol Spectrosc
November 2024
Plastic and Polymer Engineering, Department of Biological and Chemical Engineering, Aarhus University, 8200 Aarhus N, Denmark. Electronic address:
Article Synopsis
- * The camera setup employs a scanning Fabry-Pérot interferometer and records data to distinguish between twelve different plastic types when heated to 60 °C.
- * A nine-component principal component analysis combined with a k-nearest neighbors model achieves high accuracy, with a 90% micro precision and 99% macro specificity, successfully classifying most plastic types except for ABS.
Denoising-autoencoder-facilitated MEMS computational spectrometer with enhanced resolution on a silicon photonic chip.
Nat Commun
November 2024
Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore.
Article Synopsis
- Silicon photonics allows for the creation of small, affordable spectrometers using a tunable interferometer, with MEMS reconfiguration being an efficient and low-power tuning method.* -
- However, MEMS devices struggle with noise issues that can lower their spectral resolution, making improvements necessary.* -
- This research introduces a new spectrometer design that combines a low-loss waveguide coupler and a convolutional autoencoder for denoising, achieving impressive reconstruction resolution even in noisy environments, making it a promising solution for precise spectral analysis.*
Multilateral shearing interferometers (multi-LSIs) utilize the phase difference information of multiple shear directions with high accuracy and strong noise resistance. However, the interferogram fringe contrast of multi-LSIs can reverse due to the effect of contrast modulation, leading to incorrect measurement result. This issue has lacked comprehensive quantitative research to effectively guide the elimination of its effects.
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