High speed interferometer fourier transform spectrometer including a weighted capacitive matrix
AssigneeGeneral Electric Company
InventorsGerald J. Michon, Jerome J. Tiemann
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Abstract
An interferometer Fourier transform spectrometer, having increased speed, is capable of performing a Fourier transform in parallel, in analog form, using a weighted matrix. The spectrometer includes a linear detector array responsive to an interferogram. The detector array is coupled to a plurality of integrating sampling amplifiers. Each column of a group of columns of the matrix is coupled in parallel to a respective integrating sampling amplifier, and the output signals from each row of a group of rows form an output signal array.
Claims24
A high speed interferometer Fourier transform spectrometer, comprising:
- a linear detector array for receiving an interferogram, said linear detector array comprising a plurality of detector means;
- a weighted matrix comprising a plurality of transform coefficient means, arranged in a group of columns and a group of rows, each one of said columns coupled in parallel with a respective one of said detector means;
- and
- a plurality of differential means coupled to said weighted matrix, each one of said differential means coupled to a respective one of said rows of said weighted matrix corresponding to a wavelength of said interferogram, the magnitude of a respective transform coefficient means of said weighted matrix being selected to optimize a trade-off between goals of maximum output signal from a respective one of said differential means and minimum output signal from all other differential means of said weighted matrix when said respective one of said differential means algebraically adds output signals of said transform coefficient means of said respective one of said rows.
A high speed interferometer Fourier transform spectrometer, comprising:
- a linear detector array for receiving an interferogram, said linear detector array comprising a plurality of detector means;
- a plurality of integrating sampling means, each of said integrating sampling means having an input coupled to said linear detector array such that each respective one of said integrating sampling means is coupled to a respective one of said detector means;
- and
- a weighted matrix comprising a plurality of switched transform coefficient means arranged in a group of columns and a group of rows, said weighted matrix being coupled to said plurality of integrating sampling means such that each respective one of said columns is coupled in parallel to a respective output of said integrating sampling means, the magnitude of each respective one of said transform coefficient means being selected to optimize a trade-off between goals of maximum output signal from a respective one of said rows corresponding to a particular wavelength of said interferogram and minimum output signal from all other rows of said weighted matrix.
A high speed interferometer Fourier transform spectrometer, comprising:
- a linear detector array for receiving an interferogram, said linear detector array comprising a plurality of detector means;
- a plurality of integrating sampling means coupled to said linear detector array, each respective one of said integrating sampling means being coupled to a respective one of said detector means;
- a weighted matrix comprising a plurality of switched capacitances arranged in a group of col-runs and a group of rows, each respective one of said col-runs being coupled in parallel to a respective one of said integrating sampling means, the magnitude of each respective capacitance of said weighted matrix being selected to optimize a trade-off between goals of maximum output signal from a respective one of said rows corresponding to a particular wavelength of said interferogram and minimum output signal from all other rows of said weighted matrix;
- and
- a plurality of amplifier means for amplifying the output of said weighted matrix, each one of said amplifier means being coupled to a respective one of said rows corresponding to a wavelength of said interferogram received by said spectrometer.
Dependencies are inferred from the claim text.