REAL TIME FOURIER TRANSFORM SYNTHESIZER
1967
Abstract : 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.
Keywords:
- Discrete Fourier transform
- Nuclear magnetic resonance
- Fourier sine and cosine series
- Short-time Fourier transform
- Discrete Fourier transform (general)
- Sine and cosine transforms
- Discrete-time Fourier transform
- Non-uniform discrete Fourier transform
- Discrete cosine transform
- Electronic engineering
- Optics
- Chemistry
- Fractional Fourier transform
- Algorithm
- Fourier transform
- Condensed matter physics
- Discrete sine transform
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