scholarly journals Time-resolved mid-infrared dual-comb spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad A. Abbas ◽  
Qing Pan ◽  
Julien Mandon ◽  
Simona M. Cristescu ◽  
Frans J. M. Harren ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Vibrational Excitation ◽  
High Spectral Resolution ◽  
Acquisition Time ◽  
Time Resolved ◽  
Short Acquisition Time ◽  
Mid Infrared ◽  
Infrared Wavelength ◽  
Potential Applications ◽  
Kinetics Of

AbstractDual-comb spectroscopy can provide broad spectral bandwidth and high spectral resolution in a short acquisition time, enabling time-resolved measurements. Specifically, spectroscopy in the mid-infrared wavelength range is of particular interest, since most of the molecules have their strongest rotational-vibrational transitions in this “fingerprint” region. Here we report time-resolved mid-infrared dual-comb spectroscopy, covering ~300 nm bandwidth around 3.3 μm with 6 GHz spectral resolution and 20 μs temporal resolution. As a demonstration, we study a CH4/He gas mixture in an electric discharge, while the discharge is modulated between dark and glow regimes. We simultaneously monitor the production of C2H6 and the vibrational excitation of CH4 molecules, observing the dynamics of both processes. This approach to broadband, high-resolution, and time-resolved mid-infrared spectroscopy provides a new tool for monitoring the kinetics of fast chemical reactions, with potential applications in various fields such as physical chemistry and plasma/combustion analysis.

The Application of Hyper-Spectral Remote Sensing in Cultural Relic Conservation

2012 ◽  
Vol 446-449 ◽  
pp. 3798-3802
Author(s):  
Xin Lu ◽  
Miao Le Hou ◽  
Yun Gang Hu
Keyword(s):  
Remote Sensing ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Basic Principles ◽  
New Science ◽  
Hyper Spectral ◽  
Potential Applications ◽  
Cultural Relic ◽  
New Perspective ◽  
Non Destructive

Hyper-spectral remote sensing as new science and technology, is gradually applied to various fields. The technology has the technical advantages which are the high spectral resolution and non-destructive detection. These provide a new perspective for the research and protection of cultural relics. This paper firstly described the basic principles of hyper-spectral technology and its advantages, then stated the main applications of the technology in the conservation work, and at last, briefly summarized its limitations and potential applications.

scholarly journals Hybrid high spectral resolution broadband mid-infrared SFG spectrometer development and demonstration

2021 ◽  
Author(s):  
Karolis Madeikis ◽  
Robertas Kananavicius ◽  
Rokas Danilevicius ◽  
Audrius Zaukevicius ◽  
Januskevicius Regimantas ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Mid Infrared

High Spectral Resolution Time‐resolved Optical Spectroscopy of V893 Scorpii

2001 ◽  
Vol 563 (1) ◽  
pp. 351-360 ◽  
Author(s):  
E. Mason ◽  
W. Skidmore ◽  
S. B. Howell ◽  
R. E. Mennickent
Keyword(s):  
Optical Spectroscopy ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Resolution Time ◽  
Time Resolved

scholarly journals Lidar Innovations for Technologies and Environmental Sciences (LITES) – An Remote Sensing Infrastructure Facility: Setup and Measurements Examples

2020 ◽  
Vol 237 ◽  
pp. 07017
Author(s):  
Boyan Tatarov ◽  
Detlef Müller ◽  
Matthias Tesche ◽  
Sung-Kyun Shin
Keyword(s):  
Remote Sensing ◽  
Spectral Resolution ◽  
High Energy ◽  
High Spectral Resolution ◽  
Ultra High Energy ◽  
Lidar Signal ◽  
Environmental Sciences ◽  
Time Resolved ◽  
The University

At the University of Hertfordshire, we have been developing a new remote sensing facility (LITES) to explore the feasibility of using Raman and/or fluorescence backscattering for chemical aerosol profiling. This paper provides an overview of the instruments of the facility and measurement examples. LITES includes a ultra-high-energy Nd:YAG/OPO setup, spectroscopic equipment with high spectral resolution, several imaging and single detectors that allow for time-resolved (lidar) signal detection, a Raman/fluorescence microscope, and a suite of gas and aerosol chambers. We present examples of elastic, rotational and vibrational spectroscopic lidar signals, as well as in-situ microscopic spectrums of dust and bio-aerosol compounds.

EXES: The Echelon-cross-echelle Spectrograph for SOFIA

2018 ◽  
Vol 07 (04) ◽  
pp. 1840013 ◽  
Author(s):  
M. J. Richter ◽  
C. N. DeWitt ◽  
M. McKelvey ◽  
E. Montiel ◽  
R. McMurray ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Infrared Astronomy ◽  
High Spectral Resolution ◽  
Echelle Spectrograph ◽  
Mid Infrared ◽  
Low Background ◽  
And Performance ◽  
Operational Modes ◽  
Echelon Grating

The Echelon-cross-echelle spectrograph (EXES) is a high spectral resolution, mid-infrared spectrograph designed for and operated on the Stratospheric Observatory for Infrared Astronomy (SOFIA). EXES has multiple operational modes, but is optimized for high spectral resolution. The heart of the instrument is a one meter long, diamond-machined echelon grating. EXES also uses a 10242 Si:As detector optimized for low-background flux. We will discuss the design, operation and performance of EXES.

scholarly journals Improved spectral resolution of the femtosecond stimulated Raman spectroscopy achieved by the use of the 2nd-order diffraction method

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dong-gu Kang ◽  
Kyung Chul Woo ◽  
Do Hyung Kang ◽  
Chanho Park ◽  
Sang Kyu Kim
Keyword(s):  
Raman Spectroscopy ◽  
Spectral Resolution ◽  
Diffraction Method ◽  
High Spectral Resolution ◽  
Double Pass ◽  
Time Resolved ◽  
Order Diffraction ◽  
Pump Laser Pulse ◽  
Raman Pump ◽  
Stimulated Raman

AbstractProlongation of the picosecond Raman pump laser pulse in the femtosecond stimulated Raman spectroscopy (FSRS) setup is essential for achieving the high spectral resolution of the time-resolved vibrational Raman spectra. In this work, the 2nd-order diffraction has been firstly employed in the double-pass grating filter technique for realizing the FSRS setup with the sub-5 cm−1 spectral resolution. It has been experimentally demonstrated that our new FSRS setup gives rise to a highly-resolved Raman spectrum of the excited trans-stilbene, which is much improved from those reported in the literatures. The spectral resolution of the present FSRS system has been estimated to be the lowest value ever reported to date, giving Δν = 2.5 cm−1.

scholarly journals Mid-infrared interferometry with high spectral resolution

2010 ◽  
Author(s):  
Edward H. Wishnow ◽  
William Mallard ◽  
Vikram Ravi ◽  
Sean Lockwood ◽  
Walt Fitelson ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Mid Infrared ◽  
Infrared Interferometry

scholarly journals Cloud identification and classification from high spectral resolution data in the far and mid infrared

2019 ◽  
Author(s):  
Tiziano Maestri ◽  
William Cossich ◽  
Iacopo Sbrolli
Keyword(s):  
Spectral Resolution ◽  
Learning Algorithm ◽  
Far Infrared ◽  
Synthetic Dataset ◽  
High Spectral Resolution ◽  
Spectral Radiance ◽  
Electromagnetic Spectrum ◽  
Cloud Detection ◽  
Mid Infrared ◽  
Univariate Distribution

Abstract. A new Cloud Identification and Classification algorithm, named CIC, is presented. CIC is a machine-learning algorithm, based on Principal Component Analysis, able to perform a cloud detection and scene classification using a univariate distribution and a threshold, which serves as a binary classifier. CIC is tested on a widespread synthetic dataset of high spectral resolution radiances in the far and mid infrared part of the spectrum simulating measures from the ESA Earth Explorer Fast Track 9 competing mission FORUM (Far Infrared Outgoing Radiation Understanding and Monitoring) that is currently (2018/19) undergoing the industrial and scientific Phase-A studies. Simulated spectra are representatives of many diverse climatic areas, ranging from the tropical to polar regions. Application of the algorithm to the synthetic dataset provides high scores for clear/cloud identification, especially when optimisation processes are performed. One of the main results consists in pointing out the high information content of spectral radiance in the far-infrared region of the electromagnetic spectrum to identify cloudy scenes specifically thin cirrus clouds.

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