61 results about "Inelastic scattering" patented technology

System, method, and apparatus for determining the composition of a sample of material. In one embodiment, the method pertains to the counting of photons that were inelastically scattered by the sample, and for minimizing the effects of fluorescent or phosphorescent photons. In yet another embodiment of the invention, a sample is illuminated by a repetitive pulse of monochromatic light, and the resultant scattered photons from the samples are collected and counted during a predetermined integration period. Yet other embodiments pertain to a low-cost, computer-controlled system for repetitively counting inelastically scattered photons so as to create a Raman histogram and a Raman spectrogram of the photons.

A borehole logging system for determining bulk density, porosity and formation gas/liquid fluid saturation of formation penetrated by a borehole. Measures of fast neutron radiation and inelastic scatter gamma radiation, induced by a pulsed neutron source, are combined with an iterative numerical solution of a two-group diffusion model to obtain the formation parameters of interest. Double-valued ambiguities in prior art measurements are removed by using the iterative solution of the inverted two-group diffusion model. The system requires two gamma ray detectors at different axial spacings from the source, and a single neutron detector axially spaced between the two gamma ray detectors. The system can be embodied as a wireline system or as a logging-while-drilling system.

A C/O ratio is determined using measurements of inelastically scattered gamma rays with a pulsed neutron source. Combined with look-up tables, the C/O measurement is used as an indicator of formation fluid influx into wellbore such as gas kick.

The present invention discloses a system and method for estimating absolute elemental concentrations of a subterranean formation from neutron-induced gamma-ray spectroscopy. In one example, a system (10) for estimating an absolute yield of an element in a subterranean formation may include a downhole tool (12) and data processing circuitry (14). The downhole tool may include a neutron source (18) to emit neutrons into the formation, a neutron monitor (20) to detect a count rate of the emitted neutrons, and a gamma-ray detector (26,28) to obtain gamma-ray spectra deriving at least in part from inelastic gamma- rays produced by inelastic scattering events and neutron capture gamma-rays produced by neutron capture events. The data processing circuitry may be configured to determine a relative elemental yield from the gamma-ray spectra and to determine an absolute elemental yield based at least in part on a normalization of the relative elemental yield to the count rate of the emitted neutrons.

The invention provides a method for obtaining pure inelastic scattering gamma-ray energy spectra in stratum element well logging. The method includes the following steps that the inelastic scattering gamma-ray energy spectra and capture gamma-ray energy spectra of a target stratum are obtained according to well logging materials, wherein the inelastic scattering gamma-ray energy spectra include the capture radiation reaction influence; the inelastic scattering gamma-ray energy spectra including the capture radiation reaction influence are segmented by the adoption of the feature of the elements in the known stratum and the feature of the capture gamma rays, and corresponding deduction coefficients are arranged for all the energy spectrum segments; according to the deduction coefficients of all the energy spectrum segments and the deduction amount determined by the product of the capture gamma-ray energy spectra of the corresponding energy spectrum segments, the influence of the capture radiation reaction is deducted from the inelastic scattering gamma-ray energy spectra of the corresponding energy spectrum segments so as to obtain the pure inelastic scattering gamma-ray energy spectra of the target stratum. By means of the method, the more pure inelastic scattering gamma-ray energy spectra can be obtained.

A method and apparatus for enabling chemical identification of individual particles, cells of molecules by obtaining a Raman spectrum of a particle, cell or molecule as it flows past a sensing point in a flow cytometer. The particles, which may be cells or molecules, are associated with a suitable noble metal colloid or colloidal aggregate. Cellular particles may be associated with gold or silver colloidal particles by ultra-sonic sonification while in a sample preparation reservoir containing the gold or silver colloidal suspension. The colloid associated particles are then hydrodynamically focused into a single file by a fluid control module. The surface-enhance Raman Spectrum of individual particles are obtained by illuminating the particle with a laser as the particle flows past a sensing point and gathering the light that is non-elastically scattered (Raman scattered) by the particle. The surface-enhanced Raman spectrum is then analyzed to identify the particle.

The invention provides a method and a device for evaluating abundance of organic matter of a hydrocarbon source rock, wherein the method comprises the following steps: emitting high-energy neutron to a stratum; recording an inelastic scattering gamma-ray spectra generated by the interaction of nucleus of elements in the stratum and the high-energy neutron; analyzing the inelastic scattering gamma-ray spectra, to obtain the content of elements in the stratum; obtaining the content of inorganic carbon in the stratum by using the elements associated with the content of the inorganic carbon; deducting the content of the inorganic carbon from the total carbon content of the stratum, so as to obtain the content of the organic carbon in the stratum; evaluating the abundance of organic matter of the hydrocarbon source rock by using the content of the organic carbon element.

The invention discloses a stratum element logging element standard spectrum making and application method. First of all, an element standard spectrum is made by use of a Monte Carlo value simulation method, and then, experiment verification is carried out on the element standard spectrum by use of an instrument actual measurement power spectrum so that correctness and availability of the element standard spectrum are guaranteed. After a captured gamma power spectrum and/or an inelastic scattering gamma power spectrum of stratum elements are obtained, based on the element standard spectrum, spectrum unfolding is carried out on the captured gamma power spectrum and/or the inelastic scattering gamma power spectrum through a least square method, and the contents of the stratum elements are obtained. According to the method provided by the invention, the element yield can be rapidly and accurately obtained, and the calculation accuracy and the calculation efficiency of the element contents are guaranteed.

The invention relates to a thermal imaging sensor pixel unit and a thermal imaging sensor pixel array. The pixel unit comprises a substrate, a heat gathering component, and a heat absorbing component. The heat absorbing component is disposed between the substrate and the heat gathering component. The heat gathering component includes a focusing lens which is embedded into a hollow frame and erected above the heat absorbing component in a suspended manner. The heat absorbing component includes a heat absorbing plate and a temperature sensor on the surface of the heat absorbing plate. The heat absorbing plate is erected above the substrate in a suspended manner through a first support rack. The focusing lens is used for gathering heat radiation to the surface of the heat absorbing plate. According to the technical scheme provided by an embodiment of the invention, as the suspended focusing lens is arranged to gather heat radiation of objects, heat scattering is reduced, the proportion of heat absorption is increased, and the accuracy of detection is increased.

The invention provides an electron energy loss spectrometer for energy and momentum two-dimensional analyses and solves problems of high resolution and high signal intensity matching between an electron-beam source and an angle-resolution electron energy analyzer. The electron energy loss spectrometer comprises a flexible electron-beam source, an angle-resolution mode lens, an angle-resolution electron energy analyzer and the like. The angle-resolution electron energy analyzer can be used for analyzing a low-energy inelastic scattering electron beam of EELS (electron energy loss spectroscopy), flexibility and good monochromatization capability of the electron source, good parallel convergence capability to the electron beam of an angle-resolution mode lens system and the energy and momentum dual analytic capability of the angle-resolution electron energy analyzer are combined together, the momentum and the energy two-dimensional analyses of inelastic scattering electrons can be performed synchronously, and the electron energy loss spectrometer can be acquired, so that a measurement method is provided for accurately measuring complete information excited by surface elements.

The invention discloses a portable energy adjusting device for equivalent dose detection of a heat energy-100 MeV neutron, which comprises an inelastic scatterer, a fast neutron moderator, an energy adjustor and a thermal neutron detector. The whole device takes the shape of a ball, the thermal neutron detector is arranged at the center of a ball body and coated with the spherical fast neutron moderator; the fast neutron moderator is coated with a spherical ultrafast neutron inelastic scatterer; and the energy reaction adjustor is positioned between the fast neutron moderator and the fast neutron inelastic scatterer. The portable energy adjusting device has the advantages of compact structure and light weight and can improve the reaction of a high-energy neutron by about 30 percent as well as the sensitivity of the neutron by about 18-40 times through experimental evidence compared with the prior art.

The invention provides an inelastic scattering gamma-ray spectrometry analysis method and device. The method comprises the steps as follows: inelastic mixed spectrum and capture spectrum are measuredin a neutron pulse cycle and subjected to normalization processing; the normalized capture spectrum is added to an element first inelastic standard spectrum matrix obtained in advance, and an elementsecond standard spectrum matrix corresponding to the capture spectrum is obtained; the inelastic mixed spectrum is analyzed through the element second standard spectrum matrix, and contribution ratesof elements and the normalized capture spectrum for the inelastic mixed spectrum are obtained; the contribution rates of all the elements for the inelastic mixed spectrum are normalized, and inelasticspectrum relative yields of all the elements are obtained. Pure inelastic spectrum is not required to be obtained firstly during measurement of inelastic spectrum relative yields of all the elements,so that the defect of inaccurate underground stratum oil saturation due to defects of a fixed pure spectrum coefficient method which is mainly adopted at present can be overcome.

This invention relates to a light delivery and collection device for performing spectroscopic analysis of a subject. The light delivery and collection device comprises a reflective cavity with two apertures. The first aperture receives excitation light which then diverges and projects onto the second aperture. The second aperture is applied to the subject such that the reflective cavity substantially forms an enclosure covering an area of the subject. The excitation light interacts with the covered area of the subject to produce inelastic scattering and/or fluorescence emission from the subject. The reflective cavity reflects the excitation light as well as the inelastic scattering and/or fluorescence emission that is reflected and/or back-scattered from the subject and redirects it towards the subject. This causes more excitation light to penetrate into the subject hence enabling sub-surface measurement and also improves the collection efficiency of the inelastic scattering or fluorescence emission. The shape of the reflective cavity is optimized to further improve the collection efficiency.

The present invention comprises a novel approach for optimizing detection performance of a standoff optical detection system using the inelastic scattering of light from the target and/or inelastic scattering of light from molecules between the light emitting source and the target. This is a useful approach primarily for systems which already employ a pulsed light source, a detector, and a timing mechanism but whose primary function is not the detection of range. Using this methodology removes the need to deploy a secondary device to find range or augments the ability of any included range finder to widen the overall system operating envelope, reliability, and performance.