Abstract:
Infrared spectrometry device comprises a measurement unit, especially a measurement cell, with at least an ATR (attenuated total reflection) body (2) and an infrared source. The ATR body has at least two essentially parallel delimiting surfaces (5a, 5b), is transparent to the measurement radiation and has a refractive index that is greater than or equal to 1.5 so that the IR radiation is totally reflected from at least one limiting surface of the ATR body and is attenuated by at least a factor of six. The invention also relates to a urinal or water closet equipped with such a device.
Abstract:
Die Erfindung betrifft ein konfokales Spektrometer, mit einer breitbandigen Lichtquelle, einer vor der Lichtquelle angeordneten ersten Blendenvorrichtung mit einem ersten Spaltraster einer Hauptspaltrichtung, welche dazu ausgelegt ist, ein spaltförmiges Muster der Lichtquelle zu erzeugen, einer ersten Abbildungsoptik, welche dazu ausgelegt ist, das spaltförmige Muster der Lichtquelle auf ein abzubildendes Objekt zu fokussieren, und einem Detektorsystem, welches eine Detektoreinrichtung, welche dazu ausgelegt ist, das von dem Objekt reflektierte Licht zum Erzeugen eines spektral aufgelösten Bildes des Objekts zu erfassen, eine zweite Abbildungsoptik, welche dazu ausgelegt ist, das reflektierte Licht auf die Detektoreinrichtung zu fokussieren, und ein Dispersionselement aufweist, welches vor der zweiten Abbildungsoptik angeordnet ist, und welches dazu ausgelegt ist, das von dem Objekt reflektierte Licht entlang einer Dispersionsachse senkrecht zu der optischen Achse der zweiten Abbildungsoptik spektral zu dispergieren.
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:
An interference fringe pattern generator form's an interference fringe pattern from the light rays diffused from a region of an object positioned against a background. A planar array of detector pixels is arranged to capture an image of the interference fringe pattern. A storage medium records information indicative of intensity values of the image of the interference fringe pattern captured by a selected group of pixels of the planar array of detector pixels. The information is recorded as a function of the optical path difference values traversed by the diffused light rays through the interference fringe pattern generator for each of the pixels in the selected, group of pixels. A processor determines the spectral characteristics of the object based on the information indicative of the intensity values recorded by the storage medium and the optical path difference values traversed by the diffused light rays.
Abstract:
Methods and systems for performing broadband spectroscopic metrology with reduced sensitivity to focus errors are presented herein. Significant reductions in sensitivity to focus position error are achieved by imaging the measurement spot onto the detector such that the direction aligned with the plane of incidence on the wafer surface is oriented perpendicular to the direction of wavelength dispersion on the detector surface. This reduction in focus error sensitivity enables reduced focus accuracy and repeatability requirements, faster focus times, and reduced sensitivity to wavelength errors without compromising measurement accuracy. In a further aspect, the dimension of illumination field projected on the wafer plane in the direction perpendicular to the plane of incidence is adjusted to optimize the resulting measurement accuracy and speed based on the nature of target under measurement.
Abstract:
In some examples, a method for compressing a spectral reflectance dataset may be performed through compression circuitry. The method may include computing a principal component analysis basis for the spectral reflectance dataset; projecting the spectral reflectance dataset onto the principal component analysis basis to obtain a weight matrix; quantizing the weight matrix; performing a Huffman encoding process on the quantized weight matrix to generate a Huffman table and Huffman codes for the quantized weight matrix; and providing compressed spectral reflectance data as the principal component analysis basis, the Huffman table, and the Huffman codes.
Abstract:
The invention concerns a method for determining the reflectance of an object (4), the method comprising a step of solving an equation having several unknowns, the equation being obtained from formed images, the reflectance of the object (4) and the illumination of the external light source (6) being two unknowns of the equation. The step of solving the equation comprises: calculating solution points of the equation, interpolating the calculated points by means of an interpolation function, and using at least one of the following approximations to solve the equation: a first approximation according to which each image is derived from the emission of a separate light flash, a second approximation according to which the interpolation function determines the stability points of the equation.