14 results about "Elastic scattering" patented technology

The invention relates to a device and a method of a high-sensitivity suspension single-droplet sensor for monitoring PM2.5 pollution, belongs to the technical field of aerosol microdroplet spectrum trace analysis, and solves the problem that ppb-magnitude gas cannot be monitored in the prior art. The method comprises the following steps: pumping aerosol into a sample cell of a droplet suspension system in a single droplet form; introducing required reaction gas into the sample pool through an atmosphere control system; scattered light signals of the single liquid drops are respectively input into the dynamic signal processing system and the microdroplet imaging system; acquiring the characteristic peak displacement change of the metal ion sensing microdroplet; establishing a gas particle distribution Mie scattering inversion model based on micro-droplet dynamic response; inverting the radius of the liquid drop according to the stimulated Raman scattering / stimulated elastic scattering signal; according to the quantitative relationship of the reaction, calculating the generation of sulfate by the droplet suspension system (sensor); and judging which gas in the actual atmosphere is a main oxidation pathway for oxidizing sulfur dioxide to generate sulfate pollutants according to a calculation result.

The invention discloses a space target pBRDF model construction method based on an improved SBA algorithm, and relates to the technical field of space target polarization measurement and modeling, and the method comprises the steps: preliminarily building a pBRDF model of a target material corresponding to a to-be-measured sample according to a pBRDF theory, a light elastic scattering theory and a blackbody radiation theory; the method comprises the following steps of: representing the actually measured # imgabs0 # value of a to-be-measured sample at each angle in a simulated atmospheric environment by acquiring a polarization characteristic measurement result of the to-be-measured sample; an improved SBA algorithm is adopted to perform parameter inversion according to the measured # imgabs 1 # value; and substituting a parameter inversion result into the pBRDF model to calculate an error between a simulation value and a measured value of the model, and selecting whether to output the pBRDF model or not according to error precision to obtain a final pBRDF model. According to the invention, the accuracy of polarization detection of the space target can be improved.

Apparatus and method for real-time detection and classification of individual airborne particles using multi-angle polarized elastic scattering and employing intelligent data analysis techniques to achieve differentiation of particles.

A method for the spatially-resolved probing of bio logical tissue (102) comprises the steps of emitting, by means of at least one light source (106), a series of light pulses into the tissue and of measuring, by means of a plurality of light detectors (108), a plurality of time-resolved responses to the light pulses scattered from the tissue. The measurement is carried out with a temporal resolution better than 20 ps. A plurality of first responses is in response to light pulses at a first illumination band and is measured at a plurality of first detection bands. The first detection bands differ from each other and from the first illumination band in order to detect inelastic scattering. A plurality of second responses is in response to light pulses at a second illumination band and is measured at a second detection band. The second detection band overlaps with the second illumination band in order to detect elastic scatting. Time of flight analysis of both responses allows to e.g. use elastic scattering for locating structures (S1, S2, S3) in the tissue (102) and for assigning them to the inelastic scattering data.

A system for charged particle therapy verification, comprising: a first detector configured to detect secondary particles emitted from a target irradiated with a charged particle beam, wherein the detector is configured to cause at least two consecutive elastic scatterings of secondary particles of fast neutrons in the detector, and to cause two consecutive incoherent scatterings and a subsequent third scattering of secondary particles of the prompt gamma-ray type, the third scattering being one of: a photoelectric effect, an incoherent scattering or a pair production.

The application discloses a formation density measurement method, a storage medium and equipment, and relates to the field of well logging technology. The method comprises the following steps: establishing a neutron logging model of formation density for representing the relationship between the formation density and the non-elastic gamma count ratio and the thermal neutron count ratio; and substituting the non-elastic scattering gamma ray count ratio, the thermal neutron count ratio and a plurality of calibration coefficients of a target formation of a well to be measured into the neutron logging model of formation density to obtain the formation density of the target formation of the well to be measured. According to the method, the final formation density can be obtained by using the thermal neutron and the non-elastic gamma count. The method has the characteristics of small influence of formation lithology, high measurement efficiency and simple design of related instruments.

Apparatus and method for real-time detection and classification of individual airborne particles using multi-angle polarized elastic scattering and employing intelligent data analysis techniques to achieve differentiation of particles.

The invention provides a water tank granularity and mineral characterization method based on laser scattering spots and a Raman spectrum, and belongs to the technical field of underwater detection. A seabed fan deposition process is reproduced and a deposition body is generated; a multi-mode optical detection system integrating laser ranging, elastic scattering imaging and Raman spectrum acquisition is adopted, a probe scans along a preset path, and bottom type tracking and maximum signal acquisition are realized in combination with real-time bottom type feedback and a dynamic optical compensation mechanism; performing multi-scale denoising and feature enhancement on the scattering image and the Raman spectrum through discrete wavelet transform; particle size distribution is inversed based on a space contrast method, and a three-dimensional particle size diagram is generated in combination with Kriging interpolation; pure mineral Raman signals are extracted through spectrum baseline correction and water interference deduction, and high-precision recognition of mineral components is achieved through spectrum library matching; and establishing a granularity-mineral correlation model through clustering analysis and partial least squares regression. The invention provides a systematic and reliable method for collaborative analysis of the sedimentary structure and the material composition.

The invention discloses a double-beam optical tweezers aerosol single-particle reaction and in-situ optical detection device, and belongs to the field of optics. The device comprises a double-beam single-light-trap optical tweezers generation device, a signal acquisition device and an optical resonant cavity, the signal acquisition device comprises a lighting source, a Raman spectrometer, a photodiode, a first camera and a second camera; two opposite light beams can be utilized to form a double-light-beam light trap, stable capturing of liquid drops is achieved, and the signal collecting device can collect Raman scattering signals, elastic scattering signals, cavity ring-down spectrum signals and photoelectric signals and collect images of the captured liquid drops at the same time. In addition, a CRDS detector is further arranged, and extinction signals of the captured liquid drops can be obtained by detecting signals of a ring-down spectrum. The light absorption capability of the captured liquid drop is obtained through the extinction signal and the elastic scattering signal, so that the light absorption capability and the scattering capability of the liquid drop are measured, and the optical property of the liquid drop is represented.

To solve the problem in which: in currently developed large-scale nuclear fusion reactors, the D-T reaction, which has a collision cross section being ten or more times larger, is employed, and ohmic heating is mainly used to raise the plasma temperature and sustain the reaction; in the present invention, countless cyclotrons are formed within the space of a TEM-mode coaxial resonator-type cavity, and high-energy collisions are efficiently generated through two-dimensional collisions to induce nuclear fusion reactions; particles that elastically scatter and collide with the wall during the process react with light elements in the wall; in order to utilize cyclotron resonance, controlling the gas pressure is extremely important; by appropriately selecting the size of the cavity and the gas pressure, maximum reaction efficiency can be obtained.SOLUTION: The present invention is a device that uses a magnetic field and a TEM-mode microwave cavity to accelerate hydrogen or deuterium to high energies, cause random collisions to induce nuclear fusion, absorb the energy of the resulting particles, and convert it into heat energy for power generation.SELECTED DRAWING: Figure 1

To provide an evaluation method capable of evaluating the density of a sample.SOLUTION: An analysis method according to the present invention includes a step of acquiring a backscattered electron spectrum of a sample, a step of performing waveform separation on an elastic scattering peak of the backscattered electron spectrum to separate the elastic scattering peak into a plurality of peaks and acquiring information on a position of each peak, a width of each peak, and an intensity of each peak, a step of specifying each element constituting the sample from the position of each peak and the width of each peak, and a step of obtaining a density of each element constituting the sample from the intensity of each peak.SELECTED DRAWING: Figure 2

The present invention discloses a waterflood identification method based on the dual physical processes of pulsed neutron moderation and diffusion, belonging to the technical fields of geophysical logging and oilfield development. A pulsed neutron detection system composed of a D-T controllable neutron tube source and a dual-spacing thermal neutron detector is adopted to extract the thermal neutron count ratio and the macroscopic capture cross-section to quickly realize the evaluation of reservoir waterflooding. This method is based on the interaction processes such as inelastic scattering, elastic scattering, and radiative capture that occur between neutrons and the atomic nuclei of formation elements. By utilizing the characteristics that the moderation process of neutrons is closely related to the hydrogen content in the formation, while the diffusion process is mainly affected by the capture ability of the formation, new parameters are constructed by integrating the two physical processes, significantly improving the response degree to reservoir waterflooding. This method has a high interpretation coincidence rate, can eliminate the influence of formation water salinity and porosity on the evaluation of waterflooded layers, and can provide a theoretical basis and technical support for quickly and accurately identifying the waterflooding situation of reservoir by pulsed neutron lifetime logging.

The application discloses a vacuum, light, electric, magnetic coupling multi-mode in-situ measurement system, which comprises a vacuum chamber, a displacement adjusting mechanism connected with the vacuum chamber, an in-situ testing device connected with a Z-direction moving end of the displacement adjusting mechanism and a vector quadrupole magnetic field device arranged in the vacuum chamber, wherein the vector quadrupole magnetic field device comprises four electromagnetic poles arranged in a cross shape and located in the same horizontal plane. In the application, the four electromagnetic poles arranged in the cross shape form the vector quadrupole magnetic field device placed in a 360-degree cross mode, which can provide a continuously adjustable uniform magnetic field or even a vector deflection magnetic field in a range of 0-0.5T, and a wide cross-shaped sector gap is naturally left between adjacent pole heads, the cross-shaped sector gap perfectly meets the strict light path requirements of X-ray transmission and 90-degree perpendicular direction fluorescent detection, fundamentally eliminates the physical shielding of the magnetic pole to the light beam and the ray, and greatly reduces the background noise caused by elastic scattering.

This application discloses a method for constructing a pBRDF model for a space target based on an improved SBA algorithm, relating to the technical field of space target polarization measurement and modeling. The method preliminarily establishes a pBRDF model for the target material corresponding to the sample to be tested based on pBRDF theory, elastic scattering theory of light, and blackbody radiation theory. The method obtains polarization characteristic measurement results of the sample to be tested to characterize the measured #imgabs0# values ​​of the sample to be tested at various angles under a simulated atmospheric environment. The improved SBA algorithm is used to perform parameter inversion based on the measured #imgabs1# values. The parameter inversion results are then introduced into the pBRDF model to calculate the error between the model simulation value and the measured value. The final pBRDF model is then selected based on the error accuracy to determine whether to output the pBRDF model. This application can improve the accuracy of polarization detection of space targets.