756 results about "Laser-induced breakdown spectroscopy" patented technology

A method for determining geochemistry of at least one geological sample with laser-induced breakdown spectral measurements performed on the geological sample in a time variant manner with spectral acquisitions made after each of a plurality of measurement shots, spectral pre-processing performed as necessary, and subsequent analysis is applied to the collected data to determine at least one geochemistry parameter of the sample. The method can provide a rapid method to estimate thermal maturity of a sample, which does not require sample preparation, and which can be non-destructive with respect to portions of the sample. A system for performing the method also is provided.

A Raman spectrometer that employs a time-gated single photon avalanche diode array as a sensor is described. The spectrometer can also perform fluorescence spectroscopy and laser induced breakdown spectroscopy (LIBS). A laser is used to provide an excitation signal to excite a specimen of interest. A spectrometer is used to separate the various intensities over a range of wavelengths, which are then caused to impinge on the array to be recorded. The time-gated single photon avalanche diode array is triggered in synchrony with the excitation signal so as to allow time resolution of the response of the sample of interest to the excitation. The array can be time-gated to resolve signals that have shorter durations as a function of time while excluding signals that have a longer time duration. Raman and LIBS signals can be observed even from specimens that fluoresce strongly.

The invention provides a laser spectrum analyzer combining a confocal micro-Raman spectrometer with a laser-induced breakdown spectrometer (LIBS). The analyzer comprises a micro-Raman system, a micro LIBS system, a high resolution micro-imaging system, a confocal micro-light path, and a spectrum receiving system with a time resolution function, and automatically switches into a white light micro-imaging observation mode, an automatic focusing mode, a LIBS spectrum working mode, and a Raman spectrum working mode. The significant characteristics of the invention are that compact combination of Raman with LIBS is realized by a micro confocal system; qualitative and quantitative analysis of substance elements at the same minimal position and molecular structure is realized; with the high-resolution imaging function, element spatial discrimination and substance structure chemical analysis can be carried out in micrometers so as to obtain complete information of spatial distribution images of chemical elements, substance structure and physical conditions of a sample.

Embodiments of the invention relate to a method and apparatus for analyzing a target material. Specific embodiments can be referred to as laser ablation laser-induced breakdown spectroscopy (LA-LIBS). Embodiments of the invention relate to the use of a first laser beam pulse incident on a target material to create an ablation event so as to produce an ablation plume of target material. Such ablation events can include, for example, plasma ablation, sub-plasma ablation, and thermal desorption. At least a portion of the ablation plume of target material can then be transported a sufficient distance away from the ablation event that a second laser beam pulse can interact with the at least a portion of the ablation plume of target material to create an analytical plasma such that the analytical plasma is uncoupled from the ablation event. The creation of the analytical plasma results in one or more elements of the at least a portion of the ablation plume of target material undergoing atomic emission, which can, optionally, be collected and analyzed.

An apparatus for performing laser-induced breakdown spectroscopy comprises a handheld unit with a pump laser and a controller. A combination of a solid laser medium and a Q-switch receive a laser beam from said pump laser. Focusing optics focus laser pulses from said combination to a focal spot at a sample. Light collection optics collect light from plasma induced of sample material by focused laser pulses. A spectrometer receives collected light and produces information describing its spectral distribution. A power source delivers electric power to other parts of the apparatus. The pump laser, combination, focusing optics, light collection optics, spectrometer and power source are parts of said handheld unit.

A process for analyzing the nutrient status of plant matter and/or soil for one or more nutrients selected from among calcium, potassium, nitrogen, sulfur, phosphorus, magnesium, chlorine, iron, boron, manganese, zinc, copper, nickel and molybdenum is described and includes contacting said plant matter and/or soil with a laser source capable of inducing breakdown of the sample whereby an emission from said sample occurs; and, analyzing said spectral emission for determination of an amount of said one or more nutrients. A process for analyzing the heavy metal content of plant matter and/or soil, or of fertilizers or soil amendments is also described.

The invention belongs to a quantitative analysis method for a laser induced breakdown spectroscopy and particularly relates to the quantitative analysis method for the laser induced breakdown spectroscopy based on a gGenetic Neural Networkgenetic neural network. In an element quantitative detection technology based on the laser induced breakdown spectroscopy and the gGenetic Neural Networkgeneticneural network, laser-induced breakdown spectroscopy (LIBS) data are analyzed by combining an artificial neural network (ANN) with the genetic algorithm (GA for short) so as to realize the quantitative detection of elements. Compared with the traditional LIBS internal calibration method and the traditional BP(Back Propagation)-ANN method, the method has the advantages of little influence from the matrix effect, simple and quick process, avoidance of local convergence, high reliability of quantitative detection and the like.

Provided are laser induced breakdown spectroscopy (LIBS) devices. Embodiments of the devices are configured to obtain a spatial resolution of 10 μm or less. Also provided are methods of using the subject LIBS devices to determine whether one or more elements of interest are present in a target sample. The devices and methods find use in a variety of applications, e.g., submicron and nanoscale chemical analysis applications.

The invention relates to an integrated laser-induced enhanced plasma spectrum acquisition system and belongs to the field of laser plasma spectrum detection. The integrated laser-induced enhanced plasma spectrum acquisition system comprises a pulse laser device, a light beam lifter, a spectrometer, a domain limiting loop, a high voltage discharge electrode, an ICCD (Intensified Charge Coupled Device) camera, a focusing lens, a sample chamber, a reflector, an adjustable optical fiber optical receiving system, a sample to be detected, a three-dimensional electric control translation platform, an imaging CCD (Charge Coupled Device), a gas flow meter and a gas pressure meter. According to the integrated laser-induced enhanced plasma spectrum acquisition system, different LIBS (Laser-induced Breakdown Spectroscopy) signals are collected by utilizing control and synchronous control of internal environments of smaller independent sealed spaces so that integration is realized; a high voltage discharge enhanced and loop limited domain synchronous enhanced LIBS system with the functions of spectrum acquisition, dynamic image analysis and the like is integrated; and more accurate measurement are realized by utilizing environment stress around the sample and control of protection gas; and the system is quick and convenient, and is favorable for industrial production and application.

A system and method for measuring elemental concentrations of a material from a sample containing several elements by LIBS analysis. The material is heated to generate plasma and its chemical composition is determined from spectral analysis of its radiation. The spectral lines of interest are identified among those emitted by the constituents of each element composing sample. The intensities of the spectral lined identified are measured. From an estimate of temperature, electron density and relative concentration values, the chemical composition of the plasma is calculated. The absorption coefficient according to wavelength is calculated for the spectral zones of the lines of interest. From an estimate of the plasma width, the spectral radiance of the plasma is calculated for the same spectral zones and then a comparison of the intensity and shape of the spectrum thus calculated with those of the spectrum measured is performed. These calculations and this comparison are repeated iteratively in order to adjust the temperature, electron density, relative values of the elemental concentrations and width of the plasma.

A method for determining mineralogical or geochemistry of at least one geological sample with vibrational spectroscopy combined with laser-induced breakdown spectral measurements performed on the geological sample in a time variant manner with spectral acquisitions made after each of a plurality of measurement shots, spectral pre-processing performed as necessary, and subsequent analysis is applied to the collected data to determine at least one mineralogical or geochemistry parameter of the sample. The method can provide a rapid method to estimate mineralogy or geochemical parameters of a sample, which does not require sample preparation, and which can be non-destructive with respect to portions of the sample. A system for performing the method also is provided.

The invention discloses a coal quality characteristic analysis method based on combination of dominant factors and a partial least square method, and belongs to the technical field of atomic emission spectroscopy. According to the method, modeling is carried out based on a physical background of coal quality characteristics. The method comprises two steps of partial least square fitting processes. In the first partial least square fitting process, characteristic lines in a spectrum relative to coal quality characteristics are used as inputs, and a nonlinear dominant factor model is established for describing a physical relationship between coal quality characteristics and laser-induced breakdown spectroscopy. In the second partial least square fitting process, dominant factor residuals are corrected by using all spectral line intensity information of the spectrum. Compared with a traditional partial least square model, with the method provided by the invention, model calibration and prediction precisions are improved.

The present invention is directed to an apparatus, a system and a method for detecting the presence or absence of trace elements in a biological sample using Laser-Induced Breakdown Spectroscopy. The trace elements are used to develop a signature profile which is analyzed directly or compared with the known profile of a standard. In one aspect of the invention, the apparatus, system and method are used to detect malignant cancer cells in vivo.

The invention relates to an underwater spectrographic detection device combining a laser raman spectrum with a laser induced breakdown spectrum. The device comprises a raman host chamber with a window and an LIBS external hanging chamber which has a window and is connected by cables and an LIBS signal transmission front-end fiber (5), and can realize detection of underwater cation and anion at the same time. The raman host chamber is equipped with a continuous laser, a front optical circuit, a spectrograph, a detector and a power supply/control communication module which are connected by the cables and an ROV deck. The LIBS external hanging chamber is internally equipped with a double impulse laser and a front optical circuit, LIBS signals enter the spectrograph through the LIBS signal transmission front-end fiber (5), a coupling device and a fiber (7), the raman signals enter the spectrograph through the raman signal transmission fiber, and multi-spectrum joint detection or single spectrum detection is realized by a set sequential control. The joint detection device has small volume and low power consumption, can be used for different marine environment measurements in submersibles, and provides a detection way capable of acquiring overall information for marine chemical detection.

The invention discloses a detection time and position controllable laser induced breakdown spectroscopy (LIBS) detection device, belongs to a technology for detecting metal elements in complex samples, and particularly relates to the technical field of soil heavy metal pollution element detection. The device is characterized in that: a fiber is axially vertical to a laser excitation beam and aligned with a plasma spark center position, the detection position is accurately adjusted through a one-dimensional platform in a range of below 5 millimeters, the device is provided with built-in LIBS acquisition control software for controlling the detection time, and the acquired spectrum has high signal-to-background ratio. The device has high working speed, and is simple in sample treatment, suitable for detecting multiple substances and convenient to carry.

The invention discloses a method for rapid detection of waste oil based on laser-induced breakdown spectroscopy. The method comprises the following steps that: step A, laser beams of a laser output system are focused on the surface of grease to be detected through lenses so as to allow the surface of the grease to be detected to form plasma plume and to glow; step B, laser-induced breakdown spectroscopic LIBS signals of the grease to be detected are transmitted to a spectrum measurement system through a signal collection system; step C, the spectrum measurement system compares measured spectroscopic data with laser-induced breakdown spectroscopic LIBS data of every element in a database, and information about varieties and contents of metal elements in the grease to be detected and analytical data of related information about contents of carbon, nitrogen, oxygen and compounds thereof are parsed according to spectral line positions and spectral line intensity; and step D, a computer system compares the analytical data with the data of a normal grease sample in the database so as to determine the quality of the detected grease sample.

The invention discloses a single-light-source dual-wavelength LIBS (laser-induced breakdown spectroscopy) measurement device and method. The device mainly comprises a pulsed laser device, a frequency multiplying crystal, a light splitter, a first total reflector, a second total reflector, a light shutter, a spectrograph and a synchronous delay controller, wherein laser generated by the pulsed laser device passes through the frequency multiplying crystal, and then is divided into fundamental frequency light and frequency multiplying light, and is irradiated to the light splitter; the frequency multiplying light is reflected by the first total reflector, and is vertically irradiated to the surface of a to-be-detected sample; the fundamental frequency light passes through the light shutter, then is reflected by the second total reflector, and then is irradiated above the surface of the to-be-detected sample by 1-5mm in parallel; spectrum signals generated by a plasma stimulated from the to-be-detected sample are converged to an optical fiber collecting head, and are transmitted to the spectrograph. The single-light-source dual-wavelength LIBS measurement device provided by the invention has the advantages of simple structure, compact volume and low price while achieving dual-pulse LIBS high detection sensitivity, and can be widely applied to the technical field of laser diagnosis and spectrum analysis.

The invention provides a laser-induced breakdown spectrum in-situ analyzer, belonging to the technical field of material analysis and characterization. The laser-induced breakdown spectrum in-situ analyzer comprises an excitation source system, a laser beam shaping system, a beam splitting system, a high-speed signal collecting system, a signal analyzing system, a sample chamber vacuum system, a continuous excitation synchronous scanning and positioning system and a sample surface imaging system. The laser beam emitted by the laser source is processed by a laser beam shaping system and is subsequently focused on the surface of an analyzed sample that can move in a three-dimensional way. The sample chamber vacuum system provides a closed environment for the analyzed sample so as to fill inthe protective gas. The beam splitting system and the signal colleting system are connected with each other by a photomultiplier; and the plasma spectrum generated on the surface of the sample is converted into an electric signal by the photomultiplier through the optical signal generated by the beam splitting system. The data processing system processes and calculates the photoelectric signal generated by the data processing system and outputs the results such as content of each element, in-situ statistics distribution and the like in the sample. Compared with the prior art, the laser-induced breakdown spectrum in-situ analyzer has the advantages of increasing the functions and extending the sample scope.

The invention discloses a rock character judging method based on laser-induced breakdown spectroscopy (LIBS). According to the method, a laser-induced breakdown spectroscopy (LIBS) technology is used to establish a rock and/or rock debris element information prediction model based on a least square support vector machine; and the rock characters can be judged according to the element information prediction data of a rock and/or rock debris sample to be detected. The method has the characteristics of directness, rapidness, accuracy, and efficiency. The rock character judgment is accurate and efficient, especially for the logging rock debris powder under a high speed drilling condition, and the rock character judgment results are the same with those of drilling and coring. The invention also provides a system for the method mentioned above at the same time.

A backpack laser-induced breakdown spectroscopy LIBS system to provide rapid in-field elemental analysis of environmental samples important to the safeguarding of special nuclear materials.

The invention discloses an on-line in situ detecting method for an infrared-ultraviolet double pulse laser induced breakdown spectroscopy, which at least comprises the following steps of: A. setting a pulse delay time according to the sample excitation characteristics to control the time interval of two lasers; B. firstly outputting laser from an infrared waveband laser, long-distance collecting, adjusting and focusing on a position to be detected, and ablating the sample to generate plasma; C. outputting laser from an ultraviolet waveband laser after a delay time, long-distance collecting, adjusting and focusing on the same position, and exciting the plasma to reinforce a spectrum signal; D. receiving the spectrum signal through a long-distance spectrum collecting device, coupling the spectrum signal in an optical fiber, transmitting the spectrum signal to a spectrograph, and obtaining the spectrum data information through an assorted software; E. collecting the spectrum data, and obtaining a detection ingredient analysis result by a calibration-free correction analysis method.