Abstract:
An apparatus and method for detecting cadmium using optical emission spectroscopy is provided. The apparatus contains a system which uses optical emission spectroscopy which is programmed and calibrated to detect the presence of cadmium in PPM. The system is calibrated using test samples which have been prepared with a lead/cadmium matrix material having at least one iron based electrode integrated therein.
Abstract:
An analysis system includes a laser source generating a laser beam for creating a plasma at a location on a sample. A spectrometer is responsive to photons emitted by the sample at said location and has an output. At least one nozzle is configured to deliver inert gas from a source locally to the location on the sample. A controller is responsive to a trigger signal and is configured to activate the laser source generating a series of laser pulses, open a valve to purge the location locally on the sample, and close the valve after one or more laser pulses.
Abstract:
Methods and systems for real time feedback and control of near-field material processing are disclosed, including generating electromagnetic radiation from a USP laser coupled to a central processing unit; coupling the electromagnetic radiation to an acousto-optic modulator; coupling the electromagnetic radiation to a beam delivery system; coupling the electromagnetic radiation to a beam delivery fiber; using the electromagnetic radiation to generate a plasma on a target mounted to an adjustable stage coupled to the central processing unit; coupling the electromagnetic radiation from the plasma to a plasma spectrum collection system; coupling the electromagnetic radiation to a spectrum analysis unit; coupling the electromagnetic radiation to a detector; and coupling the detector to the central processing unit; wherein the central processing unit uses the output from the detector as feedback in making adjustments to the USP laser and the adjustable stage. Other embodiments are described and claimed.
Abstract:
A method and apparatus for actively monitoring conditions of a plasma source for adjustment and control of the source and to detect the presence of unwanted contaminant species in a plasma reaction chamber. Preferred embodiments include a spectrometer used to quantify components of the plasma. A system controller is provided that uses feedback loops based on spectral analysis of the plasma to regulate the ion composition of the plasma source. The system also provides endpointing means based on spectral analysis to determine when cleaning of the plasma source is completed.
Abstract:
A method is described for providing a continuous flow of a target material past a laser to enable repeated firings of the laser beam at the material in a controlled and uniform fashion. The objective is to provide a means to characterize the target material using laser induced breakdown spectroscopy. The method can be employed in a laboratory or field environment providing improved methods for characterizing in real time the properties of bulk materials.
Abstract:
Aluminum, boron and silicon were identified as potential leachables from borosilicate glassware and a silica based QMA during handling of aqueous 18F. The addition of only 0.4 ppm aluminum as AlCl3 in the eluent vial resulted in a strong reduction in the labeling yield of a model [18F]fluoride SN2 reaction (from 80 to 40% incorporation). The addition of boron as KBO2 and silicon as NaSiO3 did not result in any significant decrease in labeling yield. Interestingly, there was an interaction effect between AlCl3 and KBO2 in which the negative effect from AlCl3 on labeling yield was counteracted by KBO2. The present invention demonstrates that aluminum and boron from borosilicate glassware have a strong influence on the labeling yield in nucleophilic SN2 reactions with n.c.a [18F]fluoride.
Abstract:
A spectrometer is provided. In one implementation, for example, a spectrometer comprises an excitation source, a focusing lens, a movable minor, and an actuator assembly. The focusing lens is adapted to focus an incident beam from the excitation source. The actuator assembly is adapted to control the movable mirror to move a focused incident beam across a surface of the sample.
Abstract:
A method and a device measure a chemical composition of a liquid metal suitable for coating a steel strip. The method measures a chemical composition of a liquid metal suitable for coating a steel strip for which the liquid metal is formed continuously in a first cavity, and the composition of the liquid metal is measured on a direct measurement surface thereof, for which a specimen of the liquid metal reaching the measurement surface is heated to a chosen temperature so as to isolate principally iron-based impurities from the measurement surface. Several embodiments of devices suitable for implementing the method are also presented.
Abstract:
A method for performing sub-micron optical spectroscopy, using a heated SPM probe and far-field collection optics is described. The enhanced emission characteristics at a sharp heated tip constitute a highly localized wideband IR source. Thus the IR absorption and emission properties of a sample surface adjacent can be observed and measured in the farfield even though the interaction region is sub-micron in scale. . . . providing spatial resolution mapping of sample composition.
Abstract:
A laser remote sensing apparatus comprises a laser to provide collimated excitation light at a wavelength; a sensing optic, comprising at least one optical element having a front receiving surface to focus the received excitation light onto a back surface comprising a target sample and wherein the target sample emits a return light signal that is recollimated by the front receiving surface; a telescope for collecting the recollimated return light signal from the sensing optic; and a detector for detecting and spectrally resolving the return light signal. The back surface further can comprise a substrate that absorbs the target sample from an environment. For example the substrate can be a SERS substrate comprising a roughened metal surface. The return light signal can be a surface-enhanced Raman signal or laser-induced fluorescence signal. For fluorescence applications, the return signal can be enhanced by about 105, solely due to recollimation of the fluorescence return signal. For SERS applications, the return signal can be enhanced by 109 or more, due both to recollimation and to structuring of the SERS substrate so that the incident laser and Raman scattered fields are in resonance with the surface plasmons of the SERS substrate.