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A Real Time Fourier Transform Synthesizer
Report Number: AFCRL 67-0049
Author(s): J. E. Hoffman, Jr.
Corporate Author: Utah State University Electro-Dynamics Labs
Publication Date: 11/1/1966
Pages: 125
Project: 0
Task: 0
AD Number: AD0653200
Photo Enhancement: Not Needed
Abstract Text:
A study of the relationship between the interferogram F(x) obtained in Fourier spectroscopy and the corresponding spectral distribution E is made. It is found that the spectral distribution is the Fourier cosine transform of the interferogram. Various computational techniques for performing the required transformation are studied, and a real time Fourier transform synthesizer is described. It has been designed to be compatible with a lamellar grating Michelson interferometer, but could be used just as well with a well-compensated Michelson interferometer. The system used to obtain the point of zero path difference is described in detail. A novel approach is used to obtain the cosine functions required in the synthesis of the cosine transform. All the computations except the summation are done in analog form, while the summation is done digitally. The result of the computation, the spectral distribution, is available as soon as the interferogram is obtained. Errors in the technique are discussed and methods of compensating for them are enumerated.
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Proceedings Of The Symposium On The Plasma Sheath-Plasma Electromagnetics Of Hypersonic Flight (3rd). Volume I. Radiation Characteristics Of Plasma-Covered Antennas
Report Number: AFCRL 67-0280 Volume 1
Author(s):
Corporate Author: Air Force Cambridge Research Labs
Publication Date: 5/1/1967
Pages: 240
Project: 0
Task: 0
AD Number: AD0825616
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Proceedings Of The Symposium On The Plasma Sheath-Plasma Electromagnetics Of Hypersonic Flight (3rd). Volume II. Electrical Properties Of Shock-Ionized Flow Fields
Report Number: AFCRL 67-0280 Volume 2
Author(s):
Corporate Author: Air Force Cambridge Research Labs
Publication Date: 5/1/1967
Pages: 356
Project: 0
Task: 0
AD Number: AD0825617
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Proceedings Of The Third Symposium On The Plasma Sheath - Plasma Electromagnetics Of Hypersonic Flight (3rd). Volume III. Reentry Plasmas: Simulation, Diagnostics, And Alleviation Techniques
Report Number: AFCRL 67-0280 Volume 3
Author(s):
Corporate Author: Air Force Cambridge Research Labs
Publication Date: 5/1/1967
Pages: 369
Project: 0
Task: 0
AD Number: AD0825618
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