8 results about "Plasma spectroscopy" patented technology

The present invention relates to a method and associated system for characterizing biological particles in aerosol form (i.e., suspended in an ambient gas) using laser-induced plasma spectroscopy, comprising the steps of: a) collecting (Ea) the ambient gas containing the biological particles intended to be characterized; b) generating (Eb) a jet of said particles (JAB) in a vacuum chamber (CH); c) transmitting a laser beam (FL) in the form of pulses and focusing the laser beam in the vacuum chamber (CH) transversely to the propagation direction of the jet of particles (JP) so as to capture in a focusing volume (VF) the laser beam (FL) and at least one individual particle (N) of the jet. P ), wherein the plasma sends other particles that are specific to the interaction between the laser beam and individual particles of the jet; d) collecting the particles sent by the plasma (Ed); and e) performing spectroscopic analysis of said particles (Ee) to ultimately characterize the biological particles.

The invention provides a de-noising method and a de-noising system for laser-induced plasma spectroscopy (LIBS), and provides an improved de-noising method aiming at the problem that the analysis accuracy of weak characteristic peaks of the laser-induced plasma spectroscopy (LIBS) is easily interfered by noise. According to a polynomial fitting method, a least square method and a Savitzky-Golay method in a traditional method, effective information in an original signal is easily distorted, so that a weak characteristic peak is lost, and a false peak appears; according to a traditional Fourier transform method, it is assumed that a signal is a global stationary signal, but in practical application, an LIBS signal is usually a non-stationary signal, and the problem of noise and signal confusion occurs. Aiming at the technical problem, the invention provides an improved discrete wavelet transform (DWT) denoising method, which ensures that the peak pattern of a weak characteristic peak is reserved while the noise interference is effectively removed.

This invention discloses an online boron concentration detection system and method for nuclear power plants. The system includes: a sample introduction module for pretreating a boron-containing aqueous sample to obtain a sample aerosol, and delivering the sample aerosol to the reaction end; a microwave plasma torch generation module for receiving the sample aerosol delivered by the sample introduction module and forming a high-temperature microwave plasma torch through microwave field coupling, then generating a characteristic spectrum through the high-temperature microwave plasma torch; and a characteristic spectrum identification and concentration detection module for acquiring the characteristic spectrum and performing qualitative identification and quantitative calculation to obtain the corresponding boron element concentration data. This invention, by employing microwave-induced plasma spectroscopy technology, enables accurate online analysis of boron concentration in liquid samples, thereby improving the detection accuracy and efficiency of boron.

The invention discloses a self-adaptive laser welding system for a TOPCon-0BB assembly, relates to the technical field of photovoltaic assembly manufacturing, and ensures the cleanliness and consistency of the surface before welding through real-time detection of the thickness of an oxide layer on the surface of a copper solder strip and dynamic adjustment of pretreatment power. Therefore, the absorption efficiency of laser energy is improved, and welding defects such as pseudo soldering and over-welding caused by uneven surface pollution are avoided from the source, so that the metallurgical quality and reliability of a welding joint are remarkably improved, and the long-term stability of an assembly is ensured; according to the invention, metal active state on-line monitoring based on plasma spectrum analysis is innovatively introduced, and dynamic feedback is combined with a preprocessed surface absorption efficiency parameter, so that a dual-feedback adaptive control model is constructed; therefore, the problem of inconsistent welding quality caused by uncertain factors such as material batches and environmental fluctuation is fundamentally solved.

The present disclosure provides an apparatus and system for measuring substances in a liquid under test by means of plasma spectroscopy. The apparatus comprises: an electrode, at least a part of which is adapted to be arranged in a liquid under test and is adapted to be in contact with said liquid, the electrode being adapted to generate plasma in said liquid by means of an applied voltage, wherein the plasma is located in bubbles generated by the applied voltage; and an optical detection element, which is adapted to detect an emission spectrum generated by the plasma in the bubbles, wherein the optical detection element is an optical fiber, and there is no light converging element between the optical detection element and the plasma.

The name of the invention is sodium antimonate for plasma spectrometry detection and a preparation method of a hydrate solution sample of the sodium antimonate. Belongs to the technical field of trace impurity element detection. The method mainly solves the problems of tedious detection means, low dissolution efficiency, easy introduction of impurities and influence on sample detection accuracy in the existing method. The method mainly comprises the following steps: (1) weighing uniformly ground sodium antimonate or sodium antimonate hydrate into a plastic container which can be heated in a closed manner, and then adding hydrofluoric acid and hydrochloric acid or / and nitric acid into the container; (2) sealing a container filled with sodium antimonate or sodium antimonate hydrate, hydrofluoric acid and hydrochloric acid or / and nitric acid, heating at low temperature to completely dissolve the sample, cooling to room temperature, transferring to a volumetric flask, diluting to the scale, and shaking uniformly to obtain a sodium antimonate or sodium antimonate hydrate solution to be detected. The method has the characteristics of small reagent dosage, high dissolution efficiency, low salinity and low spectral background, and is mainly used for determining trace impurity elements contained in sodium antimonate and hydrates thereof.

This invention relates to the field of real-time fly ash detection, and particularly to a method and apparatus for detecting the carbon content of fly ash based on pulsed discharge plasma spectroscopy. The method includes: setting up collection points; performing detection at the collection points and selecting several collection points as detection points based on the detection results; performing staggered detection of particles at the detection points within an alternating cycle to obtain the detection results at each detection point; identifying abnormal points among the detection points and correcting the detection results for these abnormal points; and determining the carbon content of the fly ash based on the detection results of all detection points. This invention utilizes a laser to excite particles in the fly ash into plasma at the detection points, and detects the carbon content by acquiring and analyzing the characteristic spectrum of carbon and extracting the characteristic light intensity of carbon. This invention, through reasonable selection of detection points, makes the final data more reasonable, avoids data distortion, and solves the problem of inaccurate detection results.

The invention provides a device and a system for detecting substances in liquid to be detected through plasma spectrum, the device comprises an electrode, at least one part of the electrode is suitable for being configured in the liquid to be detected and is suitable for being in contact with the liquid to be detected, the electrode is suitable for generating plasma in the liquid to be detected through external voltage, the plasma is located in bubbles generated by external voltage; and the light detection part is suitable for detecting a light-emitting spectrum generated by the plasma in the bubbles, the light detection part is an optical fiber, and no light condensing element is arranged between the light detection part and the plasma. According to the invention, when the to-be-detected liquid is subjected to external voltage to generate plasmas and bubbles, the luminescent spectrum signals of the plasmas can be effectively and completely collected, so that effective and accurate analysis and detection results of various substances in the to-be-detected liquid can be obtained.