64 results about "Differential measurement" patented technology

The invention discloses a gas concentration detection circuit and method based on differential measurement and reference compensation, and the circuit comprises at least one active gas sensitive element, the electrical parameters of which change along with the concentration of a target gas; the sensitivity of the reference gas sensitive element to the target gas is at least lower than that of the active gas sensitive element by a preset percentage threshold value; the active gas sensitive element and the reference gas sensitive element are connected in a differential pair form to form a differential signal generation unit; the differential amplification circuit is used for amplifying the differential signal output by the differential signal generation unit; the output signal of the differential amplification circuit is used for representing the concentration information of the target gas. According to the invention, environmental interference and baseline drift are directly and effectively suppressed from the hardware level, the stability and selectivity of gas concentration measurement are improved, and meanwhile, the holding circuit is simple in structure, low in cost and convenient for large-scale application.

The application discloses a bearing sealing structure internal defect nondestructive testing method and system, and relates to the technical field of nondestructive testing.The method comprises the following steps: before and after the start and end of a measurement task, calibrating a physical reference built in the system to calibrate and quantify system drift; during the scanning process, through a coaxial reverse differential measurement mechanism, real-time immunity to dynamic errors is generated to generate pretreated three-dimensional point cloud data flow; finally, through vector projection analysis of actual geometric distortion topological morphology and a predefined topological fingerprint representing a systematic aging mode, the diagnosis and compensation of the health state of the system itself are realized.Through an internal and full-cycle error defense system, the application can generate a three-dimensional model highly consistent with a physical entity, and the fidelity and long-term reliability of the detection result are improved.

The application provides a communication method, a communication device, a chip system and a readable storage medium. The method can include: receiving a first reference signal set from a network device at each transmission occasion of N transmission occasions; measuring the first reference signal set in each transmission occasion to obtain a measurement result and reporting a measurement report to the network device; the measurement result includes a measurement value of each reference signal in the first reference signal set; the measurement report includes first indication information, second indication information, a reference measurement value and a differential measurement value set of each transmission occasion; the second indication information indicates a target reference signal to which the reference measurement value belongs; the first indication information indicates an index of the target reference signal; and the differential measurement value set corresponding to any transmission occasion includes a difference value of part or all reference signals in the first reference signal set and the reference measurement value. Through the application, the efficiency of reporting the measurement result can be improved, and power consumption can be reduced.

This application belongs to the field of temperature measurement and sensing technology, specifically disclosing a temperature sensor and monitoring method for preparing molybdenum powder by ultrasonic spray thermal decomposition. The sensor includes a main body, a thermal compensation channel, a porous permeation element, and first and second temperature measuring units. The thermal compensation channel is located inside the main body and is used to preheat the purging gas by conducting heat through the main body. The porous permeation element is located at the end of the main body, the first temperature measuring unit is located on its inner wall, and the second temperature measuring unit is located in the hollow cavity inside the main body. This application eliminates the supercooling error introduced by low-temperature gas through the thermal compensation channel, prevents particle scaling by utilizing the dynamic gas film formed by the porous permeation element, and constructs a differential measurement system based on dual temperature measuring units to effectively eliminate background high-temperature radiation interference, achieving highly sensitive in-situ monitoring of the thermal effect of gas-solid interface reaction in a high-temperature aerosol environment.

The application discloses a method for measuring a detection tilt angle of a two-component atomic shearing interferometer, constructs a tilt angle set of a swing angle device; the angle of a mirror is turned between the time when atoms are subjected to the action of a pi Raman laser and a second pi / 2 Raman laser; a plurality of groups of odd number and even number are alternately detected; all tilt angles in the tilt angle set are traversed; and the actual included angle of the longitudinal direction of a CCD camera imaging surface relative to the Z-axis direction is calculated by fitting. The application also discloses a measuring device for the detection tilt angle of the two-component atomic shearing interferometer. The application enables the current atomic shearing interferometer to accurately measure the tilt angle of the detection system, thereby solving the problems of noise and system error caused by the non-zero return of the tilt angle of the detection system of the atomic shearing interferometer, and suppressing the drift of the differential measurement of the two-component atomic interferometer caused by the change of the tilt angle.

The invention provides a detector array structure which comprises a detector substrate and a photoelectric detection chip arranged on the detector substrate, and the photoelectric detection chip comprises a semiconductor substrate layer and at least one photoelectric detection unit arranged on the semiconductor substrate layer. The photoelectric detection unit comprises two sub-photoelectric detection units which are arranged in a crossed manner, each sub-photoelectric detection unit comprises a conductive electrode, a plurality of conductive leads connected with the conductive electrode and a grating microstructure connected with each conductive lead, and the grating microstructures in the two sub-photoelectric detection units are arranged in a crossed manner. According to the invention, not only can the measurement efficiency be improved, but also the reliability and integration level of differential measurement can be improved.

The application discloses an I-129 and Kr-85 online continuous monitoring system and method, relates to the technical field of spent fuel reprocessing radiation monitoring, and comprises a Kr-85 sampling detection device, an input of a first I-129 sampling detection device, and an output of a Kr-85 sampling detection device; a second I-129 sampling detection device, an output of a Kr-85 sampling detection device, and an input of a flushing interface; and a flushing interface, an output of a first I-129 sampling detection device and a second I-129 sampling detection device, and an input of an electrical control box. The application controls the on-off state of solenoid valves YV2-YV5 through the electrical control box. The application can remove Kr-85 in sampling gas through air flushing and differential measurement, and can realize I-129 and Kr-85 online continuous measurement when the concentration difference between Kr-85 and I-129 is more than 10 9 times.

This invention discloses a high-temperature resistant indirect strain measurement fiber optic sensor based on dual gratings and its calibration method, belonging to the field of sensor monitoring technology. The invention achieves an effective temperature drop of up to 350℃ through a three-stage thermo-mechanical decoupling structure consisting of a cantilever beam substrate, an alumina insulation layer, and a stainless steel conductive layer, enabling standard commercial fiber optic gratings to be applied in extreme high-temperature environments up to 600℃. Simultaneously, by employing dual-grating differential measurement technology, combined with a nonlinear strain calculation model and least squares calibration, the cross-sensitivity problem between temperature and strain is fundamentally solved.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a message indicating one or more measurement parameters associated with a set of reference signals. The UE may receive a first reference signal associated with a first measurement value and second reference signal associated with a second measurement value. The UE may transmit a measurement report based on the one or more reporting parameters and in accordance with a reporting option selected from a set of reporting options for the measurement report. The set of reporting options may include an absolute reporting option and a quantized reporting option. In some examples, the UE may receive a bit value indicating which reporting option to use for one or more measurement reports. In some examples, the UE may perform both reporting options and choose the reporting option associated with a lower error.

This invention relates to a method and apparatus for measuring the magnetostriction coefficient of magnetic thin film materials based on Fabry-Perot optical interferometry readout coupled with a nanomechanical resonator. The apparatus includes a Si / SiO2 substrate, a magnetic field source, a measurement cavity, an interferometric microscopy system, and an analysis and control component. The Si / SiO2 substrate comprises a Si layer, a SiO2 layer, and a gate. A hole extending from the gate to the Si layer is provided on the Si / SiO2 substrate. The magnetic thin film material to be measured is disposed at the opening of the hole, forming a suspended membrane, which, together with the Si / SiO2 substrate, constitutes a Fabry-Perot interferometer. The analysis and control component includes an AC signal generator, a phase-locked loop (PLL), and a lock-in amplifier. The AC signal generator is electrically connected to the magnetic field source to control the magnetic field source to generate a frequency-adjustable alternating magnetic field. The PLL is used for frequency tracking. The lock-in amplifier is used for differential measurement. Compared with existing technologies, this invention is applicable to the characterization of the magnetostriction coefficient of single-layer / few-layer van der Waals magnet thin film materials and has the advantage of high sensitivity.

The invention belongs to the technical field of nondestructive testing, particularly relates to a plane flexibility difference measurement fractal eddy current sensor optimization method based on an ON-OFF method, and is particularly suitable for a microcrack detection scene. When a flexible eddy current sensor detects different cracks, if the matching of an excitation coil and a pickup coil is kept unchanged, the sensor may not maintain the optimal detection performance for the cracks with different sizes. Therefore, the signal matrix and the switch matrix are combined by adopting a mapping method, and one excitation code corresponds to a crack signal to be responded. According to the method, the calculation efficiency is effectively improved by reducing the time for searching the optimal matching. By adopting the plane flexibility difference measurement fractal eddy current sensor optimization method based on the ON-OFF method, when the eddy current sensor faces cracks with different sizes and directions, the matching of an excitation coil and a pickup coil can be rapidly adjusted to improve the detection performance.

The application discloses a large numerical aperture lithography projection objective wave aberration splicing and stitching device and method, which comprises the following in sequence along the illumination direction of an illumination system: a mask, a mask table, a large numerical aperture lithography projection objective, a Shack-Hartmann sensor for aligning an actual image point on an imaging surface after magnification of a mask pattern by the large numerical aperture lithography projection objective, a sensor motion table capable of six-dimensional motion for bearing the Shack-Hartmann sensor, and an interferometer measurement system for measuring alignment position coordinate information and returning three-dimensional coordinates of the alignment position. The sensor motion table is used to align the Shack-Hartmann sensor with the actual image point and scan the large numerical aperture lithography projection objective wavefront information in the form of a Hadamard measurement matrix code along an I-shaped beam, differential measurement is used to separate measurement errors caused by translation and tilt adjustment errors, wavelet transform is used to improve signal sparsity, and a compressed sensing algorithm is used to reconstruct an actual wavefront, so that the large numerical aperture wave aberration splicing and stitching technology is realized.

The invention discloses a defect detection method and a defect detection system for a specular reflector, the specular reflector is arranged near the critical distance of fringe disappearance, and the local z-axis displacement Z / slope change (local concave-convex surface) caused by the curved surface of the defect can destroy the original fringe cancellation adjustment. According to the adjustment process, the geometric displacement Z which is difficult to directly measure is converted into optical parameter change which can be accurately electrically controlled and quantized, so that high-sensitivity differential measurement of Z is realized, defects are sensitively detected, and the required cost is lower. Meanwhile, surface defect information (such as concave-convex points and scratches) of high-frequency stripes is automatically filtered by utilizing the inherent spatial frequency filtering characteristic of the stripe cancellation phenomenon, so that a defect measurement result is more accurate and reliable, the requirement on stripe quality is not high, and the cost is lower.

The application belongs to the technical field of signal synchronization, and discloses a multi-camera anti-shake timing synchronization control system and method based on FPGA; the method comprises the following steps: taking FPGA as a core, generating an FSYNC signal as a camera exposure reference, and obtaining a delay value through timestamp and differential measurement; collecting IMU data to obtain a global motion vector through a gradient descent algorithm; combining the two to analyze and obtain a phase offset and feed back to the FPGA, and the FPGA adjusts the FSYNC signal according to the global motion vector; the application realizes nanosecond-level timestamp recording through the homologous clock reference and hardware-level signal binding mechanism, and combines global motion vector analysis and dynamic phase offset adjustment, thereby breaking through the limitation of the prior art that relies on static time difference compensation.

The invention discloses a bridge safety monitoring system, node and method based on differential symmetry self-diagnosis, the system comprises a node, the node comprises a mounting base, a micro exciter, a first reference resonator and a second reference resonator which are symmetrically arranged, a bridge response sensor and a processing module. The method comprises the following steps: applying homologous excitation through the micro exciter; synchronously acquiring response signals of the double reference resonators and the bridge; calculating an installation health index representing the symmetry of the installation state based on the dual reference resonator response signal; and carrying out decoupling processing on the bridge response signal by using the index, and separating out structural damage characteristics. According to the method, the node internal symmetric differential measurement system is constructed, the installation coupling state which is difficult to directly observe is converted into a computable electric signal symmetry index, the problem of misinformation caused by confusion of installation drift and structural damage in traditional monitoring is fundamentally solved, and the credibility and the operation and maintenance accuracy of the monitoring system are remarkably improved.

The invention relates to the field of industrial control systems, and discloses a plastic part mold dual-guiding and anti-offset program control method, which comprises the following steps: respectively executing active detection subprograms at a baseline control point and a preset detection point in a mold closing stroke to extract a baseline impedance characteristic value and a mechanical impedance characteristic value, the industrial control system calculates a differential impedance characteristic value between the mechanical impedance characteristic value and the baseline impedance characteristic value, and only compares the differential impedance characteristic value with a differential health threshold value so as to judge whether there is an offset risk and execute a safety action; according to the method, the two-point differential measurement value obtained in the same cycle is used as a decision basis, dynamic compensation of the global thermal drift interference of the equipment is realized from a program algorithm level, the problem of high false alarm caused by reference failure in an existing static threshold comparison mode is avoided, and the reliability of a control system under a real working condition is improved.

The invention discloses a natural potential difference measurement integral inversion method, device and equipment and a medium, and relates to the technical field of oilfield development logging, and the method comprises the steps: obtaining a fixed electrode distance potential difference measurement curve of a to-be-logged well changing with the depth of a borehole; integrating the fixed electrode distance potential difference measurement curve to obtain a natural potential measurement curve, and folding each natural potential value in the natural potential measurement curve according to a preset period to obtain a periodic analysis chart; performing data remainder taking, data deletion and correction curve drawing on the periodic analysis chart to obtain a correction curve, and correcting the two-dimensional array storing each natural potential value in the periodic analysis chart by using the correction curve; and generating a continuous natural potential curve based on the corrected two-dimensional array, and taking the continuous natural potential curve as a natural potential difference measurement integral inversion result of the to-be-logged well, thereby realizing natural potential difference measurement integral inversion of the to-be-logged well even if the to-be-logged well does not contain a stable stratum, and improving the accuracy of the natural potential difference measurement integral inversion.

This invention relates to the field of precision geometric measurement technology and discloses an automated measurement method for the dimensions and contours of electronic components. The method includes: calculating the nominal truncated phase distribution map of the electronic component under test using a virtual projection imaging model; controlling a projection unit to project a single-frequency sinusoidal fringe grating onto the electronic component and acquiring deformed fringe images; calculating the modulation distribution map gradient and extracting edge contour features to solve the actual pose of the component; performing modulo-2π differential operations on the nominal and measured truncated phase distribution maps and using an edge mask to remove high-gradient artifacts to generate a phase residual map; and converting the phase residual map into a height deviation distribution map based on the phase height mapping relationship. This invention avoids the ambiguity of phase unwrapping in the measurement of discontinuous surfaces by constructing a phase domain differential measurement channel.

Various aspects of the present disclosure relate to reporting differential measurement quantities for an antenna array. An apparatus, such as a first device, which may be a sensing transmitter (Tx) node, a user equipment (UE), a network equipment (NE), or another device, may receive a sensing signal from a second device. The first device may determine a differential measurement quantity based on the sensing signal. The differential measurement quantity may indicate a difference between a first measurement of a first channel segment associated with the first device at a first reference point, and a second measurement of a second channel segment associated with the first device at a second reference point. The first reference point and the second reference point may be associated with one or more antenna arrays of the first device. The first device may transmit a report including the differential measurement quantity.

The invention provides a high-precision temperature and pressure measuring device and method. The method comprises the steps of separating a temperature amount and a pressure amount by using temperature compensation, eliminating a vibration interference error by using differential measurement, and improving sensitivity by using a weak measurement technology. The system adopts a four-section grating design, and realizes differentiated measurement of temperature quantity and pressure intensity quantity. The method breaks through the limitation that a traditional fiber grating sensor cannot distinguish the temperature amount, the pressure intensity amount and the vibration interference error, and the measurement sensitivity and precision are remarkably improved. According to the invention, high-precision and high-sensitivity real-time measurement can be carried out on the environment temperature and pressure intensity, and the application scenarios of numerous measurement systems taking weak measurement as a theoretical basis are greatly expanded.

The application relates to a method of processing data for estimating a location of a source of an electromagnetic signal, said data comprising a plurality of datasets, each dataset being representative of the signal as received at a respective one of a plurality of vehicles. Also disclosed is a system comprising apparatus for carrying out the method, and a computer-readable medium storing a computer program for carrying out the method. The method includes: obtaining a first dataset of the plurality of datasets, the first dataset comprising successive data samples representative of the signal as received at a first one of the plurality of vehicles; obtaining a second dataset of the plurality of datasets, the second dataset comprising successive data samples representative of the signal as received at a second one of the plurality of vehicles; comparing the first dataset and the second dataset using a correlation function, wherein the correlation function relates each of a plurality of candidate adjustment factors to a respective degree of correlation between (i) the first dataset and (ii) the second dataset as adjusted by the respective candidate adjustment factor, wherein each candidate adjustment factor includes respective values for alignment of the datasets in terms of at least three differential measurements of the received signal; and selecting an adjustment factor from the plurality of candidate adjustment factors, wherein selecting the adjustment factor comprises searching for an adjustment factor that at least locally maximises the correlation function, and wherein the searching comprises multiple search iterations, and in each search iteration a maximum of two of the respective values are varied.

The present invention relates to the technical field of microwave radio frequency test. Disclosed are a tip structure for suppressing radiation, a two-dimensional probe and a probe structure. For the problems in millimeter-wave to terahertz on-chip testing of serious high-frequency radiation leakage, difficulty in continuous matching between impedance and broadband, mutual interference between a direct-current bias path and a radio frequency channel, poor balance of differential measurement, and the like, a cantilever shielding layer is introduced into a tip structure to construct a quasi-TEM transmission environment, thereby suppressing high-frequency radiation at source; a rectangular micro-coaxial structure, a rectangular waveguide-to-circular coaxial conversion structure, and an integrated direct-current bias network that are realized in light of additive manufacturing improve impedance continuity and structural consistency in a high-frequency band; and on this basis, a dual-band two-dimensional probe integrated with a duplexer, a differential two-dimensional probe suitable for differential measurement and a closed probe are further provided, so that a test system realizes single-ended and differential on-chip testing having high isolation, high repeatability and high precision in an ultra-wide frequency range.

A precision dual-beam parallelism detection device is disclosed for detecting the parallelism of a first test beam and a second test beam arranged parallel to each other with a distance L between them. The device includes an autocollimation angle measurement unit comprising a focusing lens and a photoelectric position detector located on the same optical axis. The photosensitive surface of the photoelectric position detector is located at the focal plane of the focusing lens. The focusing lens and the photoelectric position detector are mounted on a multi-degree-of-freedom attitude adjustment mechanism. The beam steering unit is a cornerstone prism used to deflect either the first or second test beam by 180° before it enters the focusing lens. The cornerstone prism has a first mounting point and a second mounting point, the center of which is located on the optical axis of the focusing lens. This invention features a simple optical path, wide applicability, and utilizes differential measurement to eliminate zero-position errors, achieving high-precision dual-beam parallelism measurement.

The invention provides a hot-line work robot arc discharge transient current test system and method and a medium. The system comprises a high-voltage wire, wherein a high-voltage test module is connected with the high-voltage wire; the liftable insulating platform is arranged right below the high-voltage wire; the current measurement module is arranged on the liftable insulating platform and is isolated from the ground to form a floating ground measurement structure. According to the invention, the whole current measurement module is electrically isolated from the ground to form a floating ground measurement structure, so that the potential reference of the measurement system and the potential of a discharge point float synchronously, and the conduction interference path of a ground loop is fundamentally cut off; the current measurement module is configured to adopt a differential measurement mode to actively identify and counteract common-mode radiation interference components, so that the signal-to-noise ratio and the measurement precision of a signal in a strong electromagnetic disturbance environment are greatly improved; the floating ground technology and the differential technology are organically combined to form a complete anti-interference system aiming at conducted interference and radiated interference.

The invention discloses a nondestructive testing method and system for internal defects of a bearing sealing structure, and relates to the technical field of nondestructive detection.The method comprises the steps that before a measurement task is started and after the measurement task is finished, a built-in physical reference of the system is calibrated so as to calibrate and quantify system drift; in the scanning process, the dynamic error is immunized in real time through a coaxial reverse differential measurement mechanism to generate a preprocessed three-dimensional point cloud data stream; and finally, carrying out vector projection analysis on the actual geometric distortion topological form and a predefined topological fingerprint representing a systematic aging mode to realize diagnosis and compensation of the health state of the system. According to the method, the three-dimensional model highly consistent with a physical entity can be generated through an internal and complete-cycle error defense system, and the fidelity and long-term reliability of a detection result are improved.

A medium liquid level measurement implementation method for a low-temperature mobile storage tank belongs to the technical field of detection, and comprises an inner tube electrode and an outer tube electrode which are coaxially assembled along the radial direction and form two polar plates of a capacitor to be measured, a coaxial cable core wire respectively connected with the two electrodes, and a signal conversion unit consisting of a driving source, a transformer, a comparison capacitor and a detector. The shielding layers of the two coaxial cables are connected to the signal ground of the signal conversion unit. Output of the driving source serves as primary winding input of the transformer. The transformer has two secondary winding outputs which are respectively connected with one end of the comparison capacitor and the other end of the inner electrode coaxial cable core wire; the outer electrode coaxial cable core wire and the other two ends of the comparison capacitor are connected with detector input. According to the invention, the influence of interference capacitors on the two signal connecting lines on the to-be-measured capacitor is eliminated, differential measurement is realized through the secondary winding and the comparison capacitor, the detection sensitivity is improved, and the anti-interference capability is enhanced.

This invention proposes a laser divergence angle detection system, method, and device based on differential measurement, relating to the field of optical communication technology. It includes: a displacement feedback control module, a spot acquisition module, and a geometric analysis processing module. The displacement feedback control module is configured to move the target surface of the optical screen from a first position to a second position along the laser optical axis and transmit the position information to the geometric analysis processing module. The spot acquisition module is configured to generate a diverging beam to be measured, perform preliminary collimation and shaping on the incident diverging beam, receive the diverging beam, convert the diverging beam into a spatially distributed spot signal, and convert the spot signal into a spot image. The geometric analysis processing module is configured to acquire the position information and the size information corresponding to the spot images before and after position adjustment, and determine the divergence angle of the diverging beam based on the position information and the size information.

The invention discloses a power distribution network fault positioning method based on an external differential tensor and adaptive curvature optimization, and the method comprises the steps: calculating the energy integral centroid time of a transient traveling wave signal in a specified frequency band, and generating a real external differential measurement tensor through executing external differential operation; the generalized topology divergence of the real external differential measure tensor and the virtual measure tensor in the probability space is calculated to obtain a non-convex objective function; establishing a space prior anchor point field with isotropic attenuation in a power grid topological space; taking minimization of the time information difference degree as a unique target, reconstructing a continuous confidence curved surface of physical cost in a regeneration kernel Hilbert space, constructing an evaluation strategy functional with a dual manifold modulation mechanism, and circularly solving the evaluation strategy functional until a set convergence tolerance is reached, so as to complete the evaluation of the physical cost in the regeneration kernel Hilbert space. And extracting topological coordinates corresponding to the global absolute minimum value of the time information difference degree. According to the method, the problem of local optimum can be solved, and low-cost and high-robustness fault positioning is realized.