Abstract:
Described are a method and apparatus for high-speed phase shifting of an optical beam. A transparent plate having regions of different optical thickness is illuminated by an optical beam along a path of incidence that extends through the regions. The transparent plate can be moved or the optical beam can be steered to generate the path of incidence. The optical beam exiting the transparent plate has an instantaneous phase value according to the region in which the optical beam is incident. Advantageously, the phase values are repeatable and stable regardless of the location of incidence of the optical beam within the respective regions, and phase changes at high modulation rates are possible. The method and apparatus can be used to modulate a phase difference of a pair of coherent optical beams such as in an interferometric fringe projection system.
Abstract:
L'interféromètre statique comporte une pupille d'entrée, une lame séparatrice, un premier miroir et un second miroir agencés de façon à ce que des faisceaux lumineux provenant d'une source collimatée se divisent sur la lame séparatrice, se réfléchissent sur chacun des miroirs et se recomposent en interférant en sortie de l'interféromètre. L'interféromètre comporte une lame prismatique d'indice n comportant une épaisseur e j variable, le premier faisceau traversant la lame prismatique avant de se réfléchir sur une surface réfléchissante du premier miroir, la surface réfléchissante comportant une pluralité de zones, chaque zone j étant située à une distance moyenne Δ j d'un plan de référence. Le plan de référence étant perpendiculaire à un axe optique et correspondant à une position d'un miroir plan pour laquelle la différence de marche entre les deux faisceaux réfléchis interférant est nulle, chaque épaisseur e j étant sensiblement égale à Δ j · n/(n-1).
Abstract:
The present invention relates to a spectrometer including a diopter (11); a recording means (15, 18) for recording, at said diopter (11), an interferogram (12) formed from two interference beams (F1, F2) and forming interference lines (13) along the transverse axis (Ox) of the interferogram (12) in the plane (xOy) of the diopter (11), said recording means (15, 18) including a network (18) of detection elements (19) so arranged to detect the spatial distribution of said interferogram (12); and is characterized in that said network (18) of detection elements (19) is two-dimensional, wherein at least one portion of said recording means (15, 18) and said interferogram (12) are angled into each other along the transverse axis (Ox) of the interferogram (12). The present invention also relates to a spectroscopic imaging device, including a means for emitting two interference beams (F1, F2), and to such a spectrometer.
Abstract:
Apparatus, method and storage medium which can provide at least one first electro-magnetic radiation to a sample and at least one second electro-magnetic radiation to a reference, such that the first and/or second electro-magnetic radiations have a spectrum which changes over time. In addition, a first polarization component of at least one third radiation associated with the first radiation can be combined with a second polarization component of at least one fourth radiation associated with the second radiation with one another. The first and second polarizations may be specifically controlled to be at least approximately orthogonal to one another.
Abstract:
Increasing signal to noise ratio in optical spectra obtained by spectrophotometers. An interferometer introduces interference effects into a source light beam. A dual beam configuration splits the source beam having the interference effects into a reference beam and a sample beam. The reference beam interacts with a reference substance and is detected by a reference detector. The sample beam interacts with a sample substance and is detected by a sample detector. An optical spectra of the sample is based on the difference between the detected reference beam and the detected sample beam.
Abstract:
A method for compensating data age in measurement signals from an interferometer includes measuring a value of the measurement signal and adjusting the measured value based on the measurement signal with a data age adjustment value to correct for data age.
Abstract:
A method processes an optical image. The method includes providing a measured magnitude of the Fourier transform of a two-dimensional complex transmission function. The method further includes providing an estimated phase term of the Fourier transform of the two-dimensional complex transmission function. The method further includes multiplying the measured magnitude and the estimated phase term to generate an estimated Fourier transform of the two-dimensional complex transmission function. The method further includes calculating an inverse Fourier transform of the estimated Fourier transform, wherein the inverse Fourier transform is a spatial function. The method further includes calculating an estimated two-dimensional complex transmission function by applying at least one constraint to the inverse Fourier transform.
Abstract:
Die Erfindung betrifft eine Infrarotmeßvorrichtung, insbesondere für die Spektrometrie wässriger Systeme, umfassend mindestens eine Meßeinheit, insbesondere eine Meßzelle, umfassend mindestens einen ATR-Körper und mindestens eine Infrarot-Lichtquelle, wobei die Meßeinheit mindestens einen ATR-Körper enthält, der mindestens zwei ebene, im wesentlichen parallele Begrenzungsflächen umfaßt, der für die Meßstrahlung transparent ist und der einen Brechungsindex aufweist, der größer ist als der eines an mindestens eine Begrenzungsfläche angrenzenden, zu untersuchenden Mediums, insbesondere größer oder gleich 1.5, wobei die IR-Meßstrahlung an mindestens einer der ebenen, parallelen Begrenzungsflächen des ATR-Körpers mindestens sechsmal abgeschwächt totalreflektierbar ist.