Spectrometer method and apparatus for near infrared to terahertz wavelengths
First Claim
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1. A spectrometer comprising:
- a lamellar grating interferometer;
a first optical system adapted to direct radiation from an object onto said interferometer;
an array of detector elements for detecting said radiation after it has passed through said interferometer and converting said detected radiation into electrical signals, each detector adapted to detect light from a different portion of said object; and
a processor coupled to receive said electrical signals containing information as to the spectral composition of said radiation from said detector elements, said processor adapted to perform a Fourier transform on said information to obtain a spectral composition of said object.
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Abstract
In accordance with the principles of the invention, a lamellar grating interferometer breaks the radiation down into its wavelength components. The two sets of teeth of the grating are moved relative to each other. The spectral output of the interferometer is focused on an array of detectors and data is stored for a large number of positions of the grating teeth. The collected data is then Fourier transformed to recover the spectrum of the radiation.
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17 Claims
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1. A spectrometer comprising:
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a lamellar grating interferometer;
a first optical system adapted to direct radiation from an object onto said interferometer;
an array of detector elements for detecting said radiation after it has passed through said interferometer and converting said detected radiation into electrical signals, each detector adapted to detect light from a different portion of said object; and
a processor coupled to receive said electrical signals containing information as to the spectral composition of said radiation from said detector elements, said processor adapted to perform a Fourier transform on said information to obtain a spectral composition of said object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of obtaining a spectral analysis of an object, said method comprising the steps of:
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introducing radiation from said object into a lamellar grating interferometer;
detecting said radiation after it has passed through said interferometer with an array of detector elements, each detector adapted to detect light from a different portion of said object converting said detected radiation into electrical signals containing spectral information about said object; and
performing a Fourier transform on said information to obtain a spectral composition of said object;
analyzing said spectral composition of said object to obtain information about physical properties of said object. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification