scholarly journals Standing wave integrated Fourier transform spectrometer for imaging spectrometry in the near infrared

2015 ◽  
Author(s):  
Gaël D. Osowiecki ◽  
Mohammad Madi ◽  
Ivan Shorubalko ◽  
Irène Philipoussis ◽  
Edoardo Alberti ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Standing Wave ◽  
Near Infrared ◽  
Fourier Transform Spectrometer ◽  
Imaging Spectrometry

Near-infrared broadband cavity-enhanced sensor system for methane detection using a wavelet-denoising assisted Fourier-transform spectrometer

The Analyst ◽  
2018 ◽  
Vol 143 (19) ◽  
pp. 4699-4706 ◽  
Author(s):  
Kaiyuan Zheng ◽  
Chuantao Zheng ◽  
Zidi Liu ◽  
Qixin He ◽  
Qiaoling Du ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Spectral Range ◽  
Near Infrared ◽  
Wavelet Denoising ◽  
Visible Spectral Range ◽  
Sensor System ◽  
Trace Gas ◽  
Fourier Transform Spectrometer ◽  
Methane Detection

The majority of broadband cavity-enhanced systems are used to detect trace gas species in the visible spectral range.

scholarly journals Retrieval of atmospheric CH<sub>4</sub> vertical information from ground-based FTS near-infrared spectra

2019 ◽  
Vol 12 (11) ◽  
pp. 6125-6141 ◽  
Author(s):  
Minqiang Zhou ◽  
Bavo Langerock ◽  
Mahesh Kumar Sha ◽  
Nicolas Kumps ◽  
Christian Hermans ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Mole Fraction ◽  
Atmospheric Chemistry ◽  
Near Infrared ◽  
Satellite Observations ◽  
Total Carbon ◽  
Fourier Transform Spectrometer ◽  
Aircraft Measurements ◽  
Retrieval Software ◽  
Total Column

Abstract. The Total Carbon Column Observing Network (TCCON) column-averaged dry air mole fraction of CH4 (XCH4) measurements have been widely used to validate satellite observations and to estimate model simulations. The GGG2014 code is the standard TCCON retrieval software used in performing a profile scaling retrieval. In order to obtain several vertical pieces of information in addition to the total column, in this study, the SFIT4 retrieval code is applied to retrieve the CH4 mole fraction vertical profile from the Fourier transform spectrometer (FTS) spectrum at six sites (Ny-Ålesund, Sodankylä, Bialystok, Bremen, Orléans and St Denis) during the time period of 2016–2017. The retrieval strategy of the CH4 profile retrieval from ground-based FTS near-infrared (NIR) spectra using the SFIT4 code (SFIT4NIR) is investigated. The degree of freedom for signal (DOFS) of the SFIT4NIR retrieval is about 2.4, with two distinct pieces of information in the troposphere and in the stratosphere. The averaging kernel and error budget of the SFIT4NIR retrieval are presented. The data accuracy and precision of the SFIT4NIR retrievals, including the total column and two partial columns (in the troposphere and stratosphere), are estimated by TCCON standard retrievals, ground-based in situ measurements, Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS) satellite observations, TCCON proxy data and AirCore and aircraft measurements. By comparison against TCCON standard retrievals, it is found that the retrieval uncertainty of SFIT4NIR XCH4 is similar to that of TCCON standard retrievals with systematic uncertainty within 0.35 % and random uncertainty of about 0.5 %. The tropospheric and stratospheric XCH4 from SFIT4NIR retrievals are assessed by comparison with AirCore and aircraft measurements, and there is a 1.0 ± 0.3 % overestimation in the SFIT4NIR tropospheric XCH4 and a 4.0 ± 2.0 % underestimation in the SFIT4NIR stratospheric XCH4, which are within the systematic uncertainties of SFIT4NIR-retrieved partial columns in the troposphere and stratosphere respectively.

An RF spectrometer for fast wide band measurement

2009 ◽  
Vol 1 (6) ◽  
pp. 537-542 ◽  
Author(s):  
Simon Hemour ◽  
Florence Podevin ◽  
Pascal Xavier
Keyword(s):  
Fourier Transform ◽  
Standing Wave ◽  
Short Circuit ◽  
Wide Band ◽  
Stationary Wave ◽  
Fourier Transform Spectrometer ◽  
Wideband Signals ◽  
New Type ◽  
5 Ghz ◽  
Proof Of Principle

A new type of spectrum analyzer using RF interferometry is presented. The stationary wave integrated Fourier transform spectrometer is dedicated to the measurement of transient wideband signals. The spectrometer is mobile and cheap. It consists of spatial samplers placed along a waveguide ended by a short circuit. The standing wave caused by the short circuit is sampled and the spectrum is obtained by an FFT computation. A 0.3–5 GHz analyzer was built as a proof-of-principle demonstration and an application to RF dosimetry is shown.

Design and experimental research on a visible-near infrared spatial modulating Fourier transform spectrometer based on micro multi-step mirrors

2014 ◽  
Vol 10 (3) ◽  
pp. 172-175 ◽  
Author(s):  
Yu-xin Qin ◽  
Jing-qiu Liang ◽  
Zhong-zhu Liang ◽  
Chao Tian ◽  
Jin-guang Lü ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Experimental Research ◽  
Near Infrared ◽  
Fourier Transform Spectrometer

scholarly journals 3-D Spectroscopy with a Fourier Transform Spectrometer

1995 ◽  
Vol 149 ◽  
pp. 316-327 ◽  
Author(s):  
J.P. Maillard
Keyword(s):  
Fourier Transform ◽  
Spectral Resolution ◽  
Near Infrared ◽  
Field Of View ◽  
Dark Side ◽  
Fourier Transform Spectrometer ◽  
Array Detectors ◽  
New Type ◽  
Nicmos 3 ◽  
Spectro Imaging

AbstractWith the advent of bidimensional array detectors the throughput advantage of a Fourier Transform Spectrometer (FTS) can be used to create a new type of 3-D spectrometer. The classical multiplex property in the spectral domain of a FTS is multiplied by the number of pixel of the array. The points of the entrance field are all observed in parallel. After discussing the properties of this instrument, the coupling of the FTS of the CFH Telescope to a camera equipped with a NICMOS 3 array is described. With this combination, spectro-imaging in any bandpass between 1 and 2.5 µm is possible within a circular 24” field of view, with a scale of 0.33”/pixel, at seeing-limited spatial resolution. Any spectral resolution is choosable up to 30,000. Illustrations are given by a study of the dark side of Venus at 1.27 µm and of planetary nebulae at 2 µm. Many other objects can benefit from this observing mode in the near infrared. Further developments of this 3-D technique are discussed.

Infrared Properties of Thin Pt/Al2O3 Granular Metal-Insulator Composite Films

1988 ◽  
Vol 132 ◽  
Author(s):  
M. F. MacMillan ◽  
R. P. Devaty ◽  
J. V. Mantese
Keyword(s):  
Fourier Transform ◽  
Growth Model ◽  
Infrared Radiation ◽  
Optical Constants ◽  
Near Infrared ◽  
Volume Fraction ◽  
Composite Films ◽  
Fourier Transform Spectrometer ◽  
Near Infrared Radiation ◽  
Metal Insulator

ABSTRACTThe reflection of mid- and near-infrared radiation (400-15000 cm−1 by thin Pt/Al2O3 cermet films was measured using a Fourier transform spectrometer. The data were compared with predictions of three models for the effective optical constants of heterogeneous materials: Maxwell-Garnett, Bruggeman, and a simplified version of a probabilistic growth model due to Sheng. Sheng's model provides the best description of the data over the complete range of metallic volume fraction. This result is expected based on the most likely topology of the films and is in agreement with other work on similar systems at higher frequencies.

Mathematical algorithms for processing and analysis of near-infrared data from a satellite-borne Fourier transform spectrometer

2012 ◽  
Vol 55 (3) ◽  
pp. 330-335 ◽  
Author(s):  
M. Yu. Kataev ◽  
S. G. Kataev ◽  
Sh. Maksyutov ◽  
A. G. Andreev ◽  
S. A. Bazelyuk ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Near Infrared ◽  
Fourier Transform Spectrometer ◽  
Mathematical Algorithms ◽  
Infrared Data
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