152 results about "Fourier transform spectrometers" patented technology
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Fourier Transform Spectrometer. A Fourier transform spectrometer (abbreviated FTS) is a Michelson interferometer with a movable mirror. By scanning the movable mirror over some distance, an interference pattern is produced that encodes the spectrum of the source (in fact, it turns out to be its Fourier transform ).
In an imaging system providing an image of a target of interest, a method of reducing interference from a laser beam includes the steps of: (a) receiving optical energy from the target of interest and the laser beam; (b) forming an interferogram of spectral energy, at each spatial position of an image, based on the optical energy received in step (a); (c) detecting the interferogram of spectral energy, at each of the spatial positions, to provide a corresponding spectral band of intensity values; (d) selecting an intensity level in the spectral band, detected in step (c), that is greater than a predetermined value, and reducing the selected intensity level; and (e) forming an image of the target of interest, after reducing the selected intensity level of step (d).
The invention discloses a Fourier transformchipspectrometer based on integrated light technique, comprising an integrated optical waveguidechip having electro-optic modulation function. Light from a light source enters the integrated optical waveguidechip through a fiber transmission coupler, and waveguide light from the chip enters an optical waveguide interferometer through a sensitive window interval. The interferometer outputs signals to a photoelectric detector. A voltagefunction generator is used for applying voltages varying with time between two modulated electrodes of the optical waveguide interferometer, the photoelectric detector is used for real-time measuring the change of the signal strength of the interferometer varying with the modulated voltage, and a signalprocessing chip connected with the photoelectric detector and the voltagefunction generator at same time is used for rapidly processingFourier transform on the signals of the interferometer to obtain an incident light spectrum. The Fourier transform chip spectrometer provided by the invention can determine visible-infrared light absorbing spectra of solids, liquid, even monomolecular adsorption layers in the sensitive window, and determine fluorescence spectra of fluorescent substances in the sensitive window, with the advantages of strong anti-interference capability, and is suitable for rapid on-site quantitative determination.
The invention relates to a double movable mirror interferometer which comprises a beam splitter, a fixed plane mirror and a first movable mirror and a second movable mirror which are arranged parallelly on a common sliding component which can be moved linearly; the first movable mirror and the second movable mirror are parallelly fixed together by a rigid structure as an independent moving component; the beam splitter and the plane mirror are mutually vertical and has an inclined angle of 45 degrees with the first movable mirror and the second movable mirror; optical path difference is generated by straight reciprocating motion of the two parallel plane movable mirrors and is four times of displacement (relative to zero optical path difference position) of the two movable mirrors. The interferometer has simple structure and low cost and is applicable to various high-resolution Fourier transform spectrometers in spectrum working areas.
The present invention relates to a system and methods for acquiring two-dimensional Fourier transform (2D FT) spectra. Overlap of a collinear pulse pair and probe induce a molecular response which is collected by spectral dispersion of the signal modulated probe beam. Simultaneous collection of the molecular response, pulse timing and characteristics permit real time phasing and rapid acquisition of spectra. Full spectra are acquired as a function of pulse pair timings and numerically transformed to achieve the full frequency-frequency spectrum. This method demonstrates the ability to acquire information on molecular dynamics, couplings and structure in a simple apparatus. Multi-dimensional methods can be used for diagnostic and analytical measurements in the biological, biomedical, and chemical fields.
An interferometer system includes an optical bench and at least two mirror structures, being patterned from one or more layers on the optical bench and erected to extend substantially perpendicularly to the bench to define two interferometer arms to provide a Micro-Electro-Mechanical Systems (MEMS) interferometer. The MEMS interferometer is further implemented in a Fourier transformspectrometer, which includes a common housing containing the interferometer and a gas cell, possibly including a preconcentrator.