Abstract:
1.- A system (1) for analysing the chemical composition of a target material (100) comprising: [a] a laser system (2) [b] at least one scanner assembly for directing said laser beam (4) onto said target material (100) to produce luminous plasma on said target material (100) and to collect the light emitted thereafter, and [c] a spectral analyser (10). The scanner assembly further comprises at least [d] first light redirecting means (12) being configured such as to let the light pass therethrough when the light falls on one first side (14) of said first light redirecting means (12) and to redirect at least part of the light when the light falls on a second opposite side (16) opposite. Said first light redirecting means (12) are arranged in the system (1) to gather said light emitted by said plasma, collinearly with the laser beam directed onto said target material (100) and to redirect said light emitted by said plasma onto said first focusing means (6).
Abstract:
The wide-angle emission filter includes a base matrix, a photoresist, and a colorant. The base matrix has a flat shape and including a transparent material. The base matrix does not generate fluorescent light or phosphorescent light by an excitation light. The photoresist is disposed in the base matrix. The photoresist is fixed in a solid state through at least one method selected from the group consisting of thermal hardening, photo hardening, and drying. The colorant is disposed in the base matrix and includes light having a predetermined wavelength range. The wide-angle emission filter filters the excitation light regardless of an incident angle of the excitation light.
Abstract:
The quantitative analysis method for analyzing the composition of materials of the invention is based on a functional relationship (curve Cσ) between line intensity and the concentration of the element in the material. The method comprises: obtaining characteristic parameters, selecting the spectral lines of neutral atoms and ions of the elements of interest, obtaining their atomic data; calculating, for the selected lines, a line crosssection; measuring line intensities; determining the concentrations of the elements of interest by means of fitting two graphs Cσ, one for neutral atoms and another for ions with a unit charge, the fitting being performed by means of an iterative algorithm which compares the experimental graphs with the curves Cσ calculated with a plasma model; calculating, for the data of the graphs Cσ, the product of line optical depth by Lorentzian width; evaluating, for the data of the graphs Cσ, a condition on the validity limit of the model, the datum for which the mentioned product is greater being eliminated if the condition is not complied with; repeating the three preceding steps until all data comply with the mentioned condition. The invention has the advantage of not requiring prior calibrations.
Abstract:
A plasma-based detector using optical spectroscopic techniques for analysing the constituents of gas samples are provided. The detector includes a plasma-generating mechanism and a plasma-localizing mechanism. Electron-injecting electrodes may be provided in the plasma chamber of the detector. A Pressure control mechanism as well as a doping module may optionally be included. In accordance with some implementations, the collection, detection and analysis of light extracted from the plasma may enable one or more of various operation modes, such as an emission mode, an absorption mode, and indirect detection mode or a constant emission mode.
Abstract:
Methods and apparatus for laser induced breakdown spectroscopy (LIBS) sample chamber. An apparatus includes a sample chamber, a laser source connected to an excitation optics assembly, the excitation optics assembly connected to a first port on the sample chamber, a collimator assembly connected to a spectrometer, the collimator assembly connected to a second port on the sample chamber, and a first lens tube positioned on the first port and a second lens tube positioned on the second port, the first lens tube protecting the first port connected to the excitation optics assembly and the second lens tube protecting the second port connected to the collimator assembly from particles emitted when a laser pulse from the laser source ablates a surface of a target sample and generates a plasma.
Abstract:
A controller (316) and method for establishing safe operation of an atomic emission spectrometer (AES) to analyze a sample (100) arranged on a sample holder (102) of the AES. The controller (316) is configured to receive a measurement of at least one test parameter indicative of the arrangement of the sample (100) on the sample holder (102). The at least one test parameter is then compared to a range of target values for that test parameter to determine if the sample (100) is arranged correctly on the sample holder (102). The test parameters may include an electrical parameter dependant on a current between a first and a second terminal at the sample holder (102), gas pressure in a gas chamber housing an electrode of the AES, or displacement of a portion of the sample holder.
Abstract:
The present invention provides a chip for plasma generation, a plasma generator, and a plasma spectrometry method, having high reproducibility of plasma light emission without a requirement of a discharge unit for removing air bubbles. The chip for plasma generation of the present invention includes a channel, the channel has a first region, a narrow portion, and a second region, the narrow portion is in communication with the first region and the second region and has a cross-sectional area smaller than the first region and the second region, and the chip satisfies at least one of the following conditions (1) and (2): (1) at least one of the inner walls of the first region and the second region has a groove portion; and (2) the chip includes a cathode fixed on the inner wall of the first region.