Abstract:
A linear-motion stage that is angularly or radially symmetric or asymmetric, or monolithic may be used as the moving mechanism in a Fourier transform spectrometer. In embodiments, a linear-motion stage includes a base; a first multiple-arm linkage extending from the base to a first carriage attachment piece; and a second multiple-arm linkage extending from the first carriage attachment piece to the base. The first multiple-arm linkage constrains a motion of the first carriage attachment piece to motion in a first plane and the second multiple-arm linkage constrains the first carriage attachment piece to motion in a second plane, the first and second planes intersecting at a plane intersection line. The first and second multiple-arm linkages constrain the motion of the first carriage attachment piece along a carriage motion line.
Abstract:
Provided is an inexpensive, high performance, compact, and energy saving light reflection mechanism comprising a first moving portion having a reflecting surface on the front surface, a supporting portion which supports the first moving portion, a first beam and a translating beam which couple the first moving portion and the supporting portion in the form of cantilever beam above and below the supporting portion, and a drive portion which moves the first moving portion, wherein a large amplitude can be obtained by small energy when the first moving portion is forced into resonance vibration in the direction perpendicular to the first reflecting surface. Also provided is an optical interferometer and a spectral analyzer.
Abstract:
Interferometric transform spectrometer (ITS) systems and methods of operation thereof. In one example, an ITS system includes a Michelson interferometer that introduces a varying optical path length difference (OPD) between its two arms so as to produce an interferogram, a detector that receives and samples the interferogram, and a scan controller coupled to the detector and to Michelson interferometer. The scan controller controls the Michelson interferometer to vary the OPD in discrete steps such that the detector provides M samples of the interferogram for each of two scan segments. In the first scan segment, the M samples have a uniform or non-uniform sample spacing and the OPD has a first maximum value. In the second scan segment, the M samples have an incrementally increasing sample spacing and the OPD has a second maximum value that is at least twice the first maximum value.
Abstract:
This disclosure provides an optical interferometer including a multi-faceted optical element that is rotated to introduce an optical path length difference between two different optical paths in the interferometer. The multi-faceted optical element can be configured to be rotated about an axis such that the optical path length difference between the first and second optical paths varies between a first value and a second value several times during one complete rotation of the optical element. The multi-faceted optical element can be rotationally symmetric having n-fold rotational symmetry. The two different optical paths can be non-coplanar with respect to each other and the multi-faceted optical element can be disposed in one of the optical paths or both the optical paths.
Abstract:
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 transform spectrometer, which includes a common housing containing the interferometer and a gas cell, possibly including a preconcentrator.
Abstract:
A quasi-translator for economically producing pure, smooth translational motion with broad arcuate or error-free motion regardless of orientation, which is useful in numerous interferometer applications including spectroscopy, a Fourier modulator and a Fourier spectrometer are provided. The quasi-translator utilizes a support, an arm including a driving magnet on a first end and a driven element on a second end, an axis for rotation of the arm, a bearing system that controls the rotation of the arm about the axis, a drive coil and a drive amplifier to drive the arm in the arcuate motion. The quasi-translator may be employed in a Fourier modulator to change the optical path difference of the interferometer/quasi-translator at a substantially constant rate of change. The quasi-translator and/or Fourier modulator may be used in a Fourier spectrometer to create an optical spectrum from a light beam and/or electrical signal created from the light beam.
Abstract:
A novel means of provided a hybrid flexure mounted moving mirror component in an interferometer is introduced herein. In particular, a linear bearing in combination with a novel flexure mounting having novel tilt and velocity control of the moving optical component is provided. Such an arrangement enables correction of the errors at the mirror itself while also solving the problem of isolating vibration and noise caused by the imperfections in the bearing surfaces used in many conventional interferometers. Using such a coupled flexure mounting of the present invention, in addition to the above benefits, also enhances velocity control because the resultant low mass of the moving mirror assembly enables the systems disclosed herein to respond faster than conventional mirror velocity controlled interferometer instruments and with a lower velocity error so as to provide a more stable and lower noise spectra from the analytical instrument.
Abstract:
An optical interferometer includes: a light source that emits a coherent first beam and a second beam that has a frequency difference corresponding to the natural frequency of a target molecule; amplitude modulating means that modulates the amplitude of the second beam; splitting means that splits the first beam into a reference beam and a first applied beam; optical path length adjusting means that adjusts the optical path length of the reference beam; and detecting means that detects an interference pattern between the reference beam and the first beam (a signal beam) that has experienced a stimulated Raman loss or gain in accordance with the amplitude modulation as a result of the frequency difference resonating with the target molecule when the first applied beam and a second applied beam (the amplitude modulated second beam) have been applied to a measurement position of an object.
Abstract:
A spectrometer with improved resolution includes a spectral domain modulator having a periodic response in the spectral domain to modulate a wideband source spectrum and cause one or more shifted bursts in the interferogram.
Abstract:
An interferometer (1) measures a measuring interference beam, while detecting the position of a moving mirror (16) on the basis of detection results obtained from a reference beam detector (25). In the interferometer, a reference beam source (21) is configured by including a light source (21a) composed of a semiconductor laser device. A reference optical system (20) has a collimating optical system (22) for a reference beam, said collimating optical system converting a laser beam outputted from the reference beam source (21) into a collimated beam, and the collimated beam is diagonally inputted to a fixed mirror (15).