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.

Stationary Wave Integrated Fourier Transform Spectrometer (SWIFTS)

2010 ◽  
Author(s):  
Jérôme Ferrand ◽  
Guillaume Custillon ◽  
Gregory Leblond ◽  
Fabrice Thomas ◽  
Thibault Moulin ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Stationary Wave ◽  
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.

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

Standing-wave Fourier transform spectrometer based on integrated MEMS mirror and thin-film photodetector

2002 ◽  
Vol 8 (1) ◽  
pp. 98-105 ◽  
Author(s):  
H.L. Kung ◽  
S.R. Bhalotra ◽  
J.D. Mansell ◽  
D.A.B. Miller ◽  
J.S. Harris
Keyword(s):  
Thin Film ◽  
Fourier Transform ◽  
Standing Wave ◽  
Fourier Transform Spectrometer

Microwave wide band absorption by carbon from Corn cob-1

2016 ◽  
Vol 12 (2) ◽  
pp. 4204-4212 ◽  
Author(s):  
Maheshwar Sharon ◽  
Ritesh Vishwakarma ◽  
Abhijeet Rajendra Phatak ◽  
Golap Kalita ◽  
Nallin Sharma ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Agricultural Waste ◽  
Wide Band ◽  
Nickel Nitrate ◽  
Equivalent Amount ◽  
Frequency Range ◽  
Corn Cob ◽  
Different Temperatures ◽  
Band Absorption ◽  
5 Ghz

Corn cob, an agricultural waste, is paralyzed at different temperatures (700oC, 800oC and 900oC). Microwave absorption of carbon in the frequency range of 2 GHz to 8 GHz is reported. Carbon activated  with 5%  nickel nitrate showed more than 90% absorption of microwave in the frequency range from 6 GHz to 8 GHz, while carbon activated  with 10% Nickel nitrate treated corn cob showed 90% absorption  in the frequency range of 2.5 GHz to 5 GHz. Carbon showing the best absorption are characterized by XRD, Raman spectra and SEM . It is suggested that corn cob treatment   alone with KOH did not improve the microwave absorption, whereas treatment along with nickel nitrate improved the absorption property much better. It is proposed that treatment with nickel nitrate helps in creating suitable pores in carbon   which improved the absorption behavior because while treating carbon with 1N HCl helps to leach out nickel creating equivalent amount of pores in the carbon.

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