Fourier Transform Heterodyne Spectroscopy: A Simple Novel Technique with Ultrahigh (150 mHz) Resolution

1987 ◽  
pp. 390-392
Author(s):  
E. Mazur
Keyword(s):  
Fourier Transform ◽  
Novel Technique ◽  
Heterodyne Spectroscopy

A Novel Technique for Reconstruction of the State of Polarization by Fourier Transform Holography

1998 ◽  
Vol 27 (2) ◽  
pp. 63-69
Author(s):  
Soumika Munsm ◽  
S. Bandyopadhyay ◽  
Ajay Ghosh
Keyword(s):  
Fourier Transform ◽  
The State ◽  
Novel Technique ◽  
State Of Polarization

Modification of PEDOT:PSS Surface by RGD Peptide

2019 ◽  
Vol 955 ◽  
pp. 68-73
Author(s):  
Šárka Tumová ◽  
Romana Malečková ◽  
Vojtěch Enev ◽  
Stanislav Stříteský ◽  
Jan Víteček ◽  
...  
Keyword(s):  
Contact Angle ◽  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Uv Light ◽  
Coupling Reaction ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Rgd Peptide ◽  
Novel Technique

In this paper, a novel technique for modification of PEDOT:PSS surface by the arginine-glycine-aspartic (RGD) acid, using a bifunctional photolinker sulfosuccinimidyl 6-(4’-azido-2’-nitrophenylamino) hexanoate (sulfo-SANPAH), is presented. The technique is based on the UV light initialized immobilization of the photolinker to the surface of the polymer and subsequent link of the RGD peptide to the photolinker via coupling reaction. The aim of this modification is the improvement of the biocompatibility and hydrophilicity of the polymer PEDOT:PSS. To confirm if the process of conjugation of RGD peptide to the surface of the polymer PEDOT:PSS was successful, the contact angle measurement, Fourier transform infrared spectroscopy, Raman spectroscopy and elemental analysis was performed. All of the obtained results indicate the conjugation of RGD peptide to the PEDOT:PSS surface was successful.

scholarly journals An Observatory for Mapping the Far UV Diffuse Galactic Emission Line Background

1990 ◽  
Vol 123 ◽  
pp. 481-486
Author(s):  
F.L. Roesler ◽  
J. Harlander ◽  
R.J. Reynolds
Keyword(s):  
Fourier Transform ◽  
Emission Line ◽  
Broad Band ◽  
Two Dimensional ◽  
Heterodyne Spectroscopy ◽  
Spatial Frequencies ◽  
Galactic Emission ◽  
Imaging Detector ◽  
Order Of Magnitude ◽  
Observation Period

AbstractA new instrumental concept for interference spectroscopy called Spatial Heterodyne Spectroscopy (SHS) is described. This instrument as currently demonstrated could provide important information on the structure, excitation, and dynamics of the ≃ 105 K component of the interstellar medium by providing velocity-resolved (20 km s−1) maps of the faint FUV emission line background over a hemisphere of the sky within a 5-6 year observation period. We are currently studying concepts expected to reduce this time by at least an order of magnitude.In the SHS technique, an all-reflection dispersive interferometer produces a Fourier transform of the spectrum as two-dimensional spatial frequencies on an imaging detector. The system does not require scanning, and measures its own internal alignment state. Although the system suffers the conventional Fourier transform multiplex disadvantage associated with the photon noise in the background FUV continuum, we estimate that for a broad-band survey Spatial Heterodyne Spectroscopy as currently demonstrated can provide 4-5 fold gains over practical grating spectrometers of similar dimensions and spatial and spectral resolution. Field widened methods currently being studied promise additional gains of two orders of magnitude.

Invited paper Fourier-transform heterodyne spectroscopy of liquid and solid surfaces

1996 ◽  
Vol 64 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Doo Soo Chung ◽  
Ka Yee Lee ◽  
Eric Mazur
Keyword(s):  
Fourier Transform ◽  
Solid Surfaces ◽  
Heterodyne Spectroscopy

On an asymptotic expansion of Fourier integrals

1992 ◽  
Vol 436 (1896) ◽  
pp. 109-120 ◽  
Keyword(s):  
Fourier Transform ◽  
Asymptotic Expansion ◽  
Fourier Transforms ◽  
Asymptotic Series ◽  
Laplace Transforms ◽  
Novel Technique ◽  
The Fourier Transform ◽  
Fourier Integrals

A formula is developed that gives the asymptotic expansion of the Fourier transform of a function whose behaviour near the origin is given by a general asymptotic series. The result is an extension of a theorem due to Olver, who obtained a kind of analogue for Fourier transforms of Watson’s lemma for Laplace transforms. The method adopted utilizes a result due to Erdelyi on Laplace transforms and depends for its success on a novel technique of evading the appearance of divergent integrals in such problems.

Fractional Fourier transform-based chirp radars for countering self-protection frequency-shifting jammers

2017 ◽  
Vol 9 (8) ◽  
pp. 1687-1693 ◽  
Author(s):  
Samer Baher Safa Hanbali ◽  
Radwan Kastantin
Keyword(s):  
Fourier Transform ◽  
Theoretical Analysis ◽  
Fractional Fourier Transform ◽  
Matched Filter ◽  
Novel Technique ◽  
True Target ◽  
Frequency Domains ◽  
Self Protection ◽  
Time And Frequency Domains ◽  
Frequency Shifting

Self-protection deceptive jammers create at the radar receiver output multiple-false targets that are impossible to isolate in both time and frequency domains. In this paper, we introduce a novel technique based on fractional Fourier transform (FrFT) to discriminate between the true target echo and those false targets in the case of frequency-shifting jammers. In fact, we exploit the capability of the FrFT to resolve, in a matched manner, spectra that are overlapping in time and frequency. This is a property that cannot be achieved using a standard matched filter. The theoretical analysis of this technique is presented and its effectiveness is verified by simulation.

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