Abstract:
An interrogation device for detecting luminescent light produced by analytes in a sample excited by multiple excitation light beams each having individual spectral contents, comprising a plurality of light sources each generating an excitation light beam; at least one detector for detecting the luminescent light produced by the sample; and an optical assembly defining distinct and fixed excitation light paths for each of the excitation light beams from the light sources to a common excitation site on the sample and defining a shared luminescence light path for the luminescent light from the excitation site on sample to the at least one detector, the excitation light paths and the luminescence light path being on a same side of the sample, the optical assembly including sample-side optics projecting the excitation light towards the sample and collecting luminescent light from the sample.
Abstract:
A dual source system and method includes a high power laser to determine elements in a sample and a lower power device to determine compounds present in the sample. An optical subsystem directs photons from the sample to a detector subsystem after laser energy from the high powered laser strikes the sample and after energy from the lower powered device strikes trie sample along the same optical path. The detector subsystem receives photons via the optical subsystem from the sample after laser energy from the high power laser strikes the sample and provides a first signal and after energy from the lower powered device strikes the sample and provides a second signal. A controller sJbsystem pulses the high power laser and process the first signal to determine elements present in the sample and energizes the lower power device and process the second signal to determine compounds present in the signal.
Abstract:
Предлагаемый способ относится к области технической физики, в частности к спектральным методам определения элементного состава жидких сред с использованием электрического разряда в жидкости в качестве источника спектров. Способ может быть реализован в устройствах для определения элементного состава жидких сред. Область применения - в системах водоподготовки на предприятиях водоснабжения населенных пунктов, в атомной и тепловой энергетике, химической промышленности, в технологическом процессе пищевой промышленности для контроля качества воды, в экологическом мониторинге объектов окружающей среды и в других областях. Техническим результатом изобретения является повышение стабильности и воспроизводимости результатов измерения, а также надежности долговременной работы устройства.
Abstract:
Provided are photoluminescence spectroscopy systems and methods for identifying and quantifying impurities in a semiconductor sample. In some embodiments, the systems and methods comprise a defocused collimated laser beam illuminating a first sample surface, and collection by a collection lens of photoluminescence from a sample edge at the intersection of the first surface with a substantially orthogonal second surface, wherein the first sample surface is oriented from about 0° to 90° with respect to a position parallel to the collection lens.
Abstract:
In one embodiment, a method for forming a recognition algorithm for laser- induced breakdown spectroscopy may include: determining a most mathematically different dataset of a plurality of spectral datasets corresponding to materials; dividing the spectral datasets into model development datasets and performance evaluation datasets; transforming, automatically with a processor, one of the model development datasets into a first discrimination model that discriminates the first spectra; removing the first spectra from the model development datasets to yield a subset of development datasets; determining a next most mathematically different spectral dataset of the spectral datasets; transforming the subset of development datasets into a second discrimination model that discriminates the second spectra; and combining the first discrimination model and the second discrimination model to form the recognition algorithm for laser- induced breakdown spectroscopy.
Abstract:
Dispositif d'analyse de matériaux par spectroscopie de plasma, du type portable et autonome, comprenant un boîtier (10) contenant un générateur laser (18) émettant des impulsions laser qui sont focalisées sur la surface d'un matériau à analyser par un miroir parabolique (32) déplaçable en translation dans le boîtier pour effectuer une série de mesures ponctuelles sur une ligne de balayage de la surface du matériau à analyser et pour une mesure sur un échantillon de calibration (50) monté dans l'embout de mesure (22) du boîtier (10).
Abstract:
Provided is a laser ablation spectroscopy apparatus and method. A pulse laser focused on the sample site to generate a plasma plume dunng a laser ablation process. The plasma plume is detected with a spectrometer and an intensified charge coupled device. A sample of matenal is coupled to a stage movable in three axes using an array of x-y-z motors. A change in the sample height is detected using a tπangulation sensor. The apparatus includes a system computer for synchronizing the movement of the stage in all directions dunng the laser ablation process. The method includes a protocol of generating one or more laser ablations per sample site. The spectral data of the total number of laser ablations for each sample site are averaged together. The protocol includes laser ablating additional sample sites and averaging the spectral data of the total number of sample sites