17 results about "Photoelectric absorption" patented technology

The invention relates to the technical field of oil and gas drilling, and discloses a rock density data processing method and system based on machine learning, a terminal and a medium. The photoelectric absorption index, the compensation density and an energy window parameter output through rock density logging are used as input parameters, the photoelectric absorption index and the compensation density of a nominal value are used as labels, a sample library is established, a learning model is established according to the sample library, and an artificial intelligence algorithm is used for processing energy spectrum data measured by the lithologic density logging instrument. The density and photoelectric absorption index evaluation accuracy and the lithologic density logging measurement precision are improved under the condition of complex well holes and stratums, and the exploration requirements of complex reservoirs such as unconventional reservoirs are effectively met.

Tapered scintillator modules and detection devices having tapered scintillator modules in at least the end that contacts an optical sensor where the taper depends on the location of the scintillator module within the active area of the optical sensor is provided. Tapering of the scintillator modules may be close to the interface between the optical sensor and the module to minimize light leak to neighboring pixels at the interface while still allowing the detection device to retain high geometric efficiency and sensitivity to incident gamma rays since the distal end may not be tapered, which has a highest probability for gamma ray interaction based on Beer-Lambert law for photoelectric absorption.

The application discloses a phase-sensitive pre-amplification method based on an electro-absorption modulated laser, and is applied to a star-ground laser communication system receiving end. A distributed feedback laser in the electro-absorption modulated laser amplifies weak pump light after long distance transmission, and generates idler light under the nonlinear effect of a laser cavity; an electro-absorption modulator in the electro-absorption modulated laser detects phase error information between signal light, pump light and idler light, and constructs an optical injection phase-locked loop through a feedback loop, so that stable control of the three-wave phase relationship is realized. Under the phase stability condition, the output light of the electro-absorption modulated laser is fed into a later-stage nonlinear medium to complete phase-sensitive pre-amplification. The phase-sensitive pre-amplification method based on the electro-absorption modulated laser has the advantages of simple structure and easy integration, can realize pump light amplification, idler light generation and phase error suppression under the condition of weak pump light, and effectively improves the receiving sensitivity performance of the star-ground laser communication system.

The application discloses a method for determining the position of drilling fluid leakage and calculating leakage parameters, which is used for finding the position of well leakage during drilling, calculating the leakage speed and leakage amount of drilling fluid, and estimating the leakage scale. The application describes the principle that the photoelectric absorption cross section Pe value of barite contained in the drilling fluid is abnormally high compared with other rocks, minerals and fluids, and the leakage position is accurately positioned by the characteristics of the high value of the Pe curve measured by the lithology density logging in the leakage well section, and the leakage speed is predicted by the correlation between the Pe logging value and the instantaneous leakage speed, and the leakage amount is calculated by combining the method of multi-mineral analysis with the actual content of barite in the drilling fluid. The method is simple and easy to operate, and the accuracy is reliable. Compared with the data provided by the field, the error of the leakage speed and the leakage amount calculated by the method is small, and the effect is good.

The application discloses a shale gas reservoir biological silicon content logging calculation method based on unit volume effective photoelectric absorption cross section index, and solves the problems of complex cost, inability to meet field large-scale, regional, low-cost evaluation and large calculation error of existing biological silicon content logging calculation methods. The method calculates unit volume effective photoelectric absorption cross section index from logging photoelectric absorption cross section index Pe and logging lithology density DEN data, and then calculates shale gas reservoir biological silicon content. The method can be used in coring wells, and has universal application value for all shale gas wells, and has smaller error and lower cost.

The application discloses a method for determining biological silicon content in shale gas reservoirs based on lithology density logging data, and solves the problems of complex cost, inability to meet field scale, regional, low-cost evaluation and large calculation error of existing biological silicon content logging calculation methods. The method comprises the following steps: obtaining logging lithology density DEN, logging photoelectric absorption cross-section index Pe and logging natural gamma GR, establishing a ternary calculation equation based on the lithology density logging data, and then calculating the biological silicon content Si_toc in the shale gas reservoirs of the well to be interpreted. The method can be applied in coring wells, and has universal application value for all shale gas wells, and has smaller error and lower cost.

This invention belongs to the technical field of oil well logging equipment and discloses a four-detector lithology density electrode device and detection method, comprising: a housing assembly, inside which are arranged sequentially a first far detector, a first near detector, a source chamber, a second near detector, and a second far detector; the distances of each detector from the source chamber, from largest to smallest, are: second far detector, first far detector, first near detector, and second near detector. This invention uses four detectors, namely the first far detector, the first near detector, the second far detector, and the second near detector. Each detector acquires density logging curves and lithology logging curves by collecting data. Moreover, if any one detector fails, the remaining three detectors can still generate two volumetric density values ​​and at least one formation photoelectric absorption index cross-section value, obtaining the volumetric density and formation photoelectric absorption index cross-section. The entire machine can still guarantee measurement accuracy and perform normal well logging.

The invention discloses a grey matter content calculation method and device and calculation equipment, and the method comprises the steps: obtaining the analysis grey matter content data of each rock core, and extracting the natural gamma logging data corresponding to each rock core from the natural gamma logging data of each coring well corresponding to each rock core; calculating volume photoelectric absorption section data corresponding to each rock core; according to the natural gamma logging data and the volume photoelectric absorption section data corresponding to each rock core, constructing a grey matter factor of each rock core; performing fitting processing according to the grey matter factor of each rock core and the analyzed grey matter content data to obtain a grey matter content calculation model; and utilizing the grey matter content calculation model to calculate grey matter content data of the target depth point according to the grey matter factor of the target depth point in the to-be-measured well. According to the grey matter content calculation method, the algorithm is simple, the data calculation amount is small, the requirement for the number of sample data is low, the efficiency and precision of grey matter content calculation can be improved, and the calculation cost and the data cost can be reduced.

The present invention provides a photoabsorptive conversion layer, a self-powered photodetector and a preparation method thereof, belonging to the field of photodetection. The photoabsorptive conversion layer provided by the present invention comprises three layers of Bi x FeO3 film layers, where 1 ≤ x < 1.1 in each Bi x FeO3 film layer, and the values of x in each Bi x FeO3 film layer are different. The open-circuit voltage of the self-powered photodetector prepared from the photoabsorptive conversion layer provided by the present invention is 0.46 - 0.66 V and the short-circuit current is 1.13 - 1.6×10 ‑4 A / cm 2 under the illumination condition of 500 nm. The zero-bias I-t curve under the illumination condition of 500 nm shows that the self-powered photodetector has a stable optical response phenomenon; by adjusting the values of x in each Bi x FeO3 film layer, a photoabsorptive conversion layer with different longitudinal distributions of defect concentrations is designed, and further the regulation of the photocurrent density and the photogenerated voltage of the self-powered photodetector is realized.

Provided are tapered scintillator modules and detection apparatuses having tapered scintillator modules that taper at least at the end that contacts the optical sensor, where the tapering depends on the location of the scintillator module within the active area of the optical sensor. The tapering of the scintillator module can be close to the interface between the optical sensor and the module to minimize light leakage at the interface to neighboring pixels, while still allowing the detection apparatus to maintain high geometric efficiency and sensitivity to incident gamma rays, since the distal end can not taper, which has the highest likelihood of gamma ray interactions based on the Beer-Lambert law of photoabsorption.

The invention discloses a semiconductor laser with a monolithic integrated photoelectric absorption region and a use method, the laser comprises a laser region, a photoelectric absorption region and a waveguide structure, the laser region and the photoelectric absorption region are integrally formed on the same epitaxial wafer, and the waveguide structure and an electrode are respectively arranged; the laser region adopts a Pi phase shift grating structure to realize single-mode stimulated radiation output; the photoelectric absorption region is not provided with a grating structure and is used for absorbing back emergent light and generating a photo-generated voltage signal; the waveguide in the absorption region is designed to be of a bent structure, and the width is gradually reduced in the light propagation direction to reduce junction capacitance. The semiconductor laser integrates a photoelectric absorption area, is compact in structure, facilitates real-time, lossless and online monitoring of the power of the laser, and is suitable for scenes with high requirements on long-term stable monitoring, such as optical communication, industrial laser processing, vehicle-mounted laser radar and the like.

The invention relates to a density logging system and method based on a perovskite-based detector, and belongs to the technical field of geological prospecting, the density logging system based on the perovskite-based detector comprises a radioactive ray source used for emitting radioactive rays to a stratum to be detected; the perovskite-based direct ray detector is used for receiving scattered rays obtained after the radioactive rays are scattered in the stratum to be detected and directly converting the scattered rays into electric signals; the signal amplification module is connected to the perovskite-based direct ray detector and is used for amplifying the electric signal to obtain a pulse signal; the pulse counting module is connected to the signal amplification module and is used for counting the pulse signals; the data analysis module is used for counting and determining density information and photoelectric absorption index information of the stratum to be detected according to the pulse signals; and the power supply module is used for supplying power to the density logging system. According to the method, the logging precision can be improved, and the environmental adaptability and reliability of a logging system are improved.

The invention provides a multimode iterative reconstruction method and device, and relates to the technical field of nuclear radiation detection. The method comprises the following steps: acquiring event information of interaction between gamma photons and a three-dimensional position sensitive semiconductor detection unit in a panoramic gamma camera system; based on the prior energy, the Compton scattering event count in the event information and the photoelectric absorption event count in the event information, obtaining an information amount, and calculating a weight according to the information amount; compton sequence reconstruction is carried out based on prior energy, and a multimode system transmission matrix is constructed according to the reconstructed Compton sequence; and performing multi-mode iteration reconstruction based on the weight and the multi-mode system transmission matrix, outputting a stable high signal-to-noise ratio image, and determining the spatial distribution of the radioactive source. According to the multi-mode iteration reconstruction method based on the coding aperture combined with the Compton and non-collimation technology, the problems that in traditional multi-mode gamma imaging, the reconstruction resolution ratio is poor, and the imaging signal-to-noise ratio is unstable are solved, and the imaging energy range, the imaging view field and the resolution ratio are effectively improved.

The present invention realizes a technique for performing crystal identification in a plurality of radiation detectors without using pLUT during operation. A processor (11) executes crystal identification processing for identifying, by using a single model (μ) generated by machine learning, a crystal in which photoelectric absorption has occurred in a radiation detector in which an event has occurred from among a plurality of radiation detectors each including a crystal array and a light-receiving element array. The model (μ) is a model in which an output signal of the light-receiving element array included in the radiation detector is used as an input, and a likelihood corresponding to each crystal constituting the crystal array included in the radiation detector and being a likelihood that the crystal is a crystal in which photoelectric absorption has occurred is used as an output.

The application discloses a near wellbore hydraulic fracturing fracture evaluation method, device, equipment and medium, relates to the oil and gas exploration and development technical field, and includes processing of each scattered gamma energy spectrum data; determining initial formation density and initial photoelectric absorption cross section index value based on the processed data, calculating initial formation fracture height and initial formation fracture position; constructing a cost function, optimizing and iterating the cost function, obtaining target formation density and target photoelectric absorption cross section index value, correcting the initial formation fracture height and the initial formation fracture position, obtaining target formation fracture height and target formation fracture position; establishing a correlation relationship, calculating target formation fracture width, realizing near wellbore hydraulic fracturing fracture evaluation, and accurately determining formation fracture position and formation fracture parameters, increasing the sensitivity of fracture response, improving the efficiency and accuracy of near wellbore hydraulic fracturing fracture evaluation, and reducing the complexity of measurement before and after fracturing.

To efficiently calculate the transmission length of an object substance to be an object of a substance discrimination.SOLUTION: A medical information processing device calculates the transmission length of an object substance to be an object of a substance discrimination within a subject's body using data obtained by imaging the subject with a photon-counting CT scanner and an equation describing X-ray attenuation. The medical information processing device includes a calculation unit. The calculation unit sets two equations on the basis of the count values of X-ray photons counted in each of two energy bins located before and after a K-edge of the object substance under imaging conditions in which the energy width of the two energy bins is set narrower than a predetermined threshold. The calculation unit calculates the transmission length of the object substance by considering the X-ray attenuation in the calibration term, photoelectric absorption term, and Compton scattering term as equivalent, in the two set equations.SELECTED DRAWING: Figure 1

The invention discloses a high-response low-noise quaternary alkali cathode film layer structure, a preparation method and a quaternary alkali cathode window thereof. The high-response low-noise quaternary alkali cathode film layer structure comprises an interface passivation layer, a high-response low-noise layer and a high-response low-noise layer, a conductive sealing layer is arranged in an area close to the periphery on the outer side surface of the interface passivation layer; an interface transition layer is arranged in the center area of the outer side surface of the interface passivation layer; a photoelectric absorption layer is arranged on the outer side surface of the interface transition layer; an electron transport layer is arranged on the outer side surface of the photoelectric absorption layer; a structure transition layer is arranged on the outer side surface of the electron transport layer; an electron escape layer is arranged on the outer side surface of the structure transition layer; and an escape protection layer is arranged on the outer side surface of the electron escape layer. The interface passivation layer, the interface transition layer and the structure transition layer are used for transition among the key functional layers, the structure stress is reduced, the number of structure defects is reduced, dark background noise caused by the structure defects is reduced, and the escape probability of photo-induced electrons is increased.