Abstract:
A portable information terminal device comprising: an enclosure 180 of the portable information terminal device, an imaging element 143 provided within the enclosure 180, a first lens 141 provided within the enclosure 180 for the imaging element 143, a second lens 142, which focal length is shorter than that of the first lens, provided within the enclosure 180 for the imaging element 143, a lens selection means 180, provided within the enclosure 180, for selecting one of the first lens 141 and the second lens 142 so that a focal point of a selected lens is at the imaging element 143, and a transparent plate 122 for pressing a tip of a finger 131 of an user of the portable information terminal device, wherein the imaging element 143 captures fingerprint of the tip of the finger 131 on the transparent plate 122 by the second lens 142 selected by the lens selection means 180.
Abstract:
The invention relates to a method for identifying chemical substances, comprising the following steps: analyzing a group of reference substances using a first method of analysis and a second, different method of analysis, especially NIR and Raman spectroscopy; storing the first and second sets of characteristic properties obtained for each reference substance and the combined sets of characteristic properties obtained by combining said first set and said second set, in a reference data base; analyzing the substance to be analyzed with the first and second methods of analysis; comparing the combined set of characteristic properties of the substance to be analyzed with the combined sets of the reference substances; identifying the substance to be analyzed with one of the reference substances when the similarity between the combined set of the substance to be analyzed and the combined set of exactly one reference substance, as established according to a set scale, exceeds a predetermined threshold value.
Abstract:
A multiplex coherent Raman spectrometer (10) and spectroscopy method rapidly detects and identifies individual components of a chemical mixture separated by a separation technique, such as gas chromatography. The spectrometer (10) and method accurately identify a variety of compounds because they produce the entire gas phase vibrational Raman spectrum of the unknown gas. This is accomplished by tilting a Raman cell (20) to produce a high-intensity, backward-stimulated, coherent Raman beam of 683 nm, which drives a degenerate optical parametric oscillator (28) to produce a broadband beam of 1100-1700 nm covering a range of more than 3000 wavenumber. This broadband beam is combined with a narrowband beam of 532 nm having a bandwidth of 0.003 wavenumbers and focused into a heated windowless cell (38) that receives gases separated by a gas chromatograph (40). The Raman radiation scattered from these gases is filtered and sent to a monochromator (50) with multichannel detection.
Abstract:
The present invention approximates and automatically subtracts continuum backgrounds in laser-induced breakdown (LIBS) and Raman spectra measured by non-gated detectors. Significantly, reference spectra are not used to determine background positioning in the present invention. The present invention approximates a spectral continuum by determining a plurality of minima in the spectral data; splitting the spectral data into a predetermined number of groups N; for each group of spectral data, determining major minima for the group, and calculating an average and a standard deviation for the determined major minima; determining a polynomial function that can be drawn through the major minima of all groups; for each group of spectral data, determining minor minima; calculating an average deviation (nullN) between this polynomial function and the determined minor minima; reducing the number of groups, and repeating this process for the reduced number of groups until a minimum number of groups is reached. Then, the least nullN corresponding to an optimal number of groups Nopt is determined. The spectral data is split into Nopt groups; and a polynomial function that can be drawn through both the major minima and minor minima is determined for Nopt groups. This polynomial function approximates the spectral continuum.
Abstract:
This invention relates to a method and apparatus for the analysis of pharmaceutical specimens by nondestructively obtaining the molecular data for a chemical component on the surface or within the matrix of a pharmaceutical specimen.
Abstract:
A portable spectral imaging microscope includes a probe head coupled via fiber optic cabling to a laser source and to a spectrograph. The probe head is coupled to a position controller that is mounted on a base suitable for positioning adjacent to a sample. The position controller has five degrees of freedom that permits one to adjust the position and direction of the probe head relative to the sample over a wide range of dimensions and angles. The entire probe head can be easily moved in order to precisely align the objective lens to stationary samples for simultaneous viewing and spectral analysis.
Abstract:
Systems and methods are described that allow the high-throughput preparation, processing, and study of arrays of samples, each of which comprises at least one compound. Particular embodiments of the invention allow a large number of experiments to be performed in parallel on samples that comprised of one or more compounds on the milligram or microgram quantities of compounds. Other embodiments of the invention encompass methods and devices for the rapid screening of the results of such experiments, as well as methods and devices for rapidly determining whether or not similarities exist among groups of samples in an array. Particular embodiments of the invention encompass methods and devices for the high-throughput preparation of different forms of compounds (e.g., different crystalline forms), for the discovery of new forms of old compounds, and for the discovery of new methods of producing such forms. Embodiments of the invention also allow for the high-throughput determination of how specific compounds or forms of compounds behave when exposed to other chemicals or environmental conditions.
Abstract:
In order to improve a method of analyzing SinullGe alloys, with which a Raman spectrum of a sample is recorded and Raman frequencies and Raman intensities of the SinullSi modes and the SinullGe modes of the alloy layer are evaluated, such that any strain and any Ge portion in an alloy layer can be ascertained in a simple and as exact a manner as possible, it is provided for one or more spectrum contributions lying outside the SinullGe modes and the SinullSi modes to be evaluated as oscillation modes.
Abstract:
An electron microscope 10 is adapted to enable spectroscopic analysis of a sample 16. A parabolic mirror 18 has a central aperture 20 through which the electron beam can pass. The mirror 18 focuses laser illumination from a transverse optical path 24 onto the sample, and collects Raman and/or other scattered light, passing it back to an optical system 30. The mirror 18 is retractable (within the vacuum of the electron microscope) by a sliding arm assembly 22.
Abstract:
Methods for preparing colloidal metal nanoparticles, in which seed colloids are added to a solution of reductant mixed with a solution containing a source of metal ions, include a method in which the seeds are colloidal gold nanoparticles, the source of gold ions is HAuCl4, and the reductant is NH2OH. SERS substrates are prepared by combining a colloidal gold monolayer with a solution containing a source of metal ions and a reductant such as NH2OH.