106 results about "Differential measurement" patented technology

The invention belongs to the technical field of signal synchronization, and discloses a multi-camera anti-shake time sequence synchronization control system and method based on an FPGA. The method comprises the following steps: taking an FPGA as a core, generating an FSYNC signal as a camera exposure reference, and obtaining a delay value through a timestamp and differential measurement; acquiring I MU data and obtaining a global motion vector through a gradient descent algorithm; analyzing by combining the two to obtain phase deviation and feeding back the phase deviation to the FPGA, and adjusting the FSYNC signal by combining the global motion vector by the FPGA according to the phase deviation; according to the method, nanosecond timestamp recording is realized through a homologous clock reference and hardware-level signal binding mechanism, and the limitation of dependence on static time difference compensation in the prior art is broken through in combination with global motion vector analysis and dynamic phase offset adjustment.

The invention discloses an error correction method and device for non-intrusive voltage differential measurement, a medium and a product, and relates to the technical field of voltage measurement, and the method is applied to a scene in which a differential electric field sensor array is arranged in a set range with a measured conductor as the center. Comprising the following steps: constructing an initial correction model based on a sensor distance and a measured conductor voltage; under the actual working condition, the initial correction model is processed through a least square method, and a correction model is obtained; when non-intrusive voltage differential measurement is carried out, the current measured conductor voltage and the sensor distance are obtained, and a correction coefficient is determined by adopting the correction model; and completing error correction of non-intrusive voltage differential measurement based on the correction coefficient. According to the invention, the complexity of an inversion algorithm and the special requirement on the spatial position of the sensor can be reduced.

The invention discloses an underwater magnetic field measuring device based on a diamond NV color center. The underwater magnetic field measuring device comprises a diamond NV color center module, an incident laser excitation module, a multi-path optical coupling module, a microwave excitation module, a fluorescence acquisition and photoelectric conversion module, a signal processing and control module and a magnetic field module, the multi-path optical coupling module is used for dividing an optical fiber into multiple paths and collecting fluorescence generated by the diamond block; the microwave excitation module is used for switching between two single-quantum resonance frequencies to drive an NV color center to realize double-quantum DQ reading; and the signal processing and control module comprises an FPGA (Field Programmable Gate Array) processing unit of a field programmable logic array chip. According to the invention, a dual-quantum DQ working point of a diamond NV color center is used as a measurement channel, common-mode influence of D is removed through differential measurement, the problem of D drift caused by temperature drift, stress and material aging is physically and obviously inhibited, and the device can still realize ultrahigh-sensitivity measurement in a complex underwater environment.

The invention discloses a liquid crystal display filtering and light transmission performance monitoring system and a monitoring method thereof, and relates to the technical field of liquid crystal displays. An ambient light real-time monitoring module; a dual-optical-path differential measurement module; a signal processing and intelligent compensation module; a polarizer dynamic adjustment module; a data storage and analysis module; light intensity fluctuation data are collected in real time through an ambient light real-time monitoring module, reference light and transmission light are synchronously collected through a double-light-path differential measurement module, a signal processing and intelligent compensation module calls a self-adaptive algorithm library, compensation coefficients are calculated in combination with ambient light spectrum data, and a polaroid adjusting instruction is generated. And then an adjusting instruction is sent to the polaroid dynamic adjusting module through the CAN bus, the polaroid dynamic adjusting module feeds back an actual thickness value in real time after adjustment is completed, closed-loop control is formed, and through real-time compensation of ambient light and dual-light-path differential measurement, the influence of a station LED lamp and natural light is eliminated, and the monitoring precision of light filtering and light transmission performance is improved.

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 invention belongs to the field of power equipment monitoring, and discloses a lightning arrester on-line monitoring system and method based on non-contact differential electric field probe self-adaptive compensation, a non-contact differential voltage probe is adopted, the sensitivity to environmental noise and interference to other-phase high-voltage buses is remarkably reduced through differential measurement, and the monitoring accuracy is improved. And the self-adaptive compensation algorithm is combined, so that the measured signal can be corrected in real time according to the on-site electromagnetic environment change, the amplitude and phase distortion can be effectively inhibited, the accuracy and reliability of the high-voltage side bus voltage acquisition can be improved, and the overall monitoring precision can be obviously improved. According to the invention, high-sensitivity and wide-dynamic-range measurement of lightning arrester current is realized by adopting the fluxgate weak current sensor, accurate detection under small signals is guaranteed, and fine analysis of harmonic components is facilitated.

The invention provides a thermal expansion coefficient measurement system and method based on light field regulation, and the system comprises a light field generation module which comprises a light source and a spatial light modulator which is used for modulating a light beam generated by the light source to generate a structured light field containing orthogonal stripes; the temperature control module is used for controlling the temperature of the to-be-tested sample; the detection module comprises a 4f optical assembly and a camera, the 4f optical assembly is used for processing a reflected light field generated after the structured light field projects the surface of the to-be-detected sample and then enabling the reflected light field to enter the camera, and the camera is used for imaging; the data processing unit is used for processing imaging data of the camera and calculating to obtain the thermal expansion coefficient of the to-be-detected sample. The programmable measurement light field is dynamically generated by adopting the SLM, and sample surface treatment is not needed; the three-dimensional deformation of the sample is inverted through the phase change of the light field, the environmental disturbance can be effectively eliminated in combination with the multi-wavelength differential measurement technology, and the measurement precision is improved.

The invention discloses a differential measurement-based satellite-borne synthetic aperture microwave radiometer imaging correction method, which comprises the following steps of: respectively selecting a reference area and a correction area in a global range, and respectively intercepting scientific data and auxiliary data in a specific time period in the reference area and the correction area based on load normal earth observation data; averaging the visibility functions intercepted in the reference area to obtain a reference visibility function; generating a reference brightness temperature and a correction brightness temperature through a simulation model by using the auxiliary data intercepted in the reference area and the correction area respectively; performing difference and inversion processing on the normal earth observation visibility function to be subjected to imaging processing by using the reference visibility function to obtain a difference inversion brightness temperature; calculating a correction coefficient by using the reference visibility function, the reference brightness temperature, the visibility function intercepted in the correction area and the correction brightness temperature; and correcting and compensating the differential inversion brightness temperature by using the correction coefficient and the reference brightness temperature to obtain the final inversion brightness temperature.

The invention provides an epitaxial growth control method and device, computer equipment and a storage medium. The epitaxial growth control method comprises the following steps: irradiating a wafer to be measured and the surface of a reference irradiation surface by adopting a super-continuum spectrum laser light source to obtain a reflected light signal; synchronously scanning and filtering the reflected light signal to output two paths of narrow-band light; the two paths of narrow-band light are converted into electric signals and then differential operation is carried out, and the reflectivity of the wafer to be measured is calculated according to a differential result; and determining growth parameters of the epitaxial layer based on the reflectivity, and adjusting process parameters of the reaction cavity according to the growth parameters so as to control epitaxial growth of the wafer to be tested. According to the super-continuum spectrum laser light source, multiple characteristic wavelengths can be scanned in one process step, synchronous monitoring of multiple growth parameters is achieved, and the monitoring requirement of a complex epitaxial structure is met; in addition, common-mode noise in the measurement process is eliminated in real time through the double-beam differential measurement technology, the signal-to-noise ratio is greatly increased, the measurement precision is improved, and accurate control over epitaxial growth is achieved.

The application discloses a kind of satellite-borne infrared emissivity differential measurement method and device using cold black background, belong to spacecraft thermal control and material on-orbit testing technical field, purpose is to eliminate environmental stray radiation and conduction heat leakage interference, realize material emissivity high-precision in-situ on-orbit test.The application relies on deep space cold black environment and differential disturbance thought, supporting layout emissivity known standard unit and unit to be measured, make two in consistent light thermal condition, respectively establish transient heat balance equation.Because two kinds of units are consistent, such as common-mode interference of stray radiation, conduction heat leakage, two formula difference can be removed interference term, only keep and emissivity related radiation heat loss term.Through the design of different thermal control conditions (such as balance heating, constant temperature control, dynamic heating), the real emissivity of the material to be measured is solved.The application is suitable for in-situ, high-precision measurement of the infrared emissivity of spacecraft surface materials, especially intelligent thermal control materials such as thermochromic materials in space environment.

The application discloses a ground absolute microwave ranging method and system based on double-path echo and RTK differential measurement, which can apply carrier phase ranging to absolute ranging. The system adopts RTK differential measurement to solve the phase integer ambiguity, especially simultaneously differentiates the observation values of two ends of the ranging main terminal, solves the extra error introduced by the traditional RTK double difference in the two-point transfer differential value, and finally compensates the error by using an atmospheric refraction correction structure model, so that the sub-millimeter level precision is achieved under the kilometer level measurement distance.

The application provides a celestial body orientation parameter solving method and system based on inverse VLBI interferometry and a medium. The method comprises the following steps: firstly, a rotation orientation physical model of a celestial body and an inverse VLBI differential measurement model are established, a lander coordinate and a celestial body orientation parameter are introduced into the model by combining the conversion between a non-inertial system and an inertial system coordinate. High-precision differential measurement tracking data of inverse VLBI are obtained, and based on the principle of the least square method, a lander position and a celestial body orientation model parameter are determined, so that the residual square sum between the calculated theoretical observation value of inverse VLBI and the ground observation value is minimum, and high-precision extraterrestrial celestial body orientation parameters are obtained. The application can realize precise positioning of a lander and solving of celestial body orientation parameters, the obtained data are high in precision, high-precision inverse VLBI differential measurement data can significantly improve the solving precision of the celestial body orientation model parameters, and then information about the internal structure and surface mass distribution change of the celestial body is provided, and additional constraints for the improvement of the celestial body physical model are provided.

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.

The invention belongs to the technical field of power systems, and discloses a GIS equipment opening and closing stroke detection device and method. Comprising a box body and further comprises a sliding block, one side wall of the sliding block is fixedly connected with a sliding column, the sliding column is inserted into the side wall of the box body in a sliding mode, one end of the sliding column is provided with a transmission assembly, the transmission assembly is arranged on a main shaft of a brake, and the transmission assembly is used for converting rotary motion of the main shaft of the brake into linear motion of the sliding block. By arranging the piezoelectric sensor, in the switching-on process of the GIS equipment, the main shaft of the switch drives the sliding block to move through the transmission assembly, the sliding block presses the spring assembly, the reading of the piezoelectric sensor changes, the switching-on and switching-off stroke of the GIS equipment is detected in real time through the reading change of the piezoelectric sensor, and the first spring and the second spring are both compressed; the arrangement of the two springs provides differential measurement and eliminates stiffness drift caused by temperature change.

This invention discloses an automatic elevation monitoring system and a real-time elevation measurement and control method for the bottom formwork. The system includes a real-time dynamic differential measurement device, a laser rangefinder, a cloud computing platform, and a jack servo controller. The real-time dynamic differential measurement device and the laser rangefinder perform real-time multi-point measurements of the absolute and relative elevations of the bottom formwork control points, respectively. The cloud computing platform receives, stores, and analyzes the measured elevation data in the cloud, automatically calculates the required elevation adjustment value for each jack, and sends it to the jack servo controller. The jack servo controller then uniformly controls the raising and lowering of all jacks based on the calculated elevation adjustment value, achieving rapid and accurate adjustment of the bottom formwork elevation. This invention improves the accuracy and efficiency of elevation adjustment, automates measurement, reduces labor costs, and lowers construction risks.

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.

A measurement system with active illumination using pulsed semiconductor diodes and a detection system comprising a camera imager with lenses and spectral filters that is synchronized to the pulsed diodes. The light generated by the diodes may comprise visible or near-infrared wavelengths. The measurement system may also comprise a time-of-flight sensor or a beam splitter to separate the diode light into a plurality of spatially separated lights. The detection system may be configured to receive light reflected from tissue comprising skin and may be configured to perform a differential measurement between a hand and another region of tissue. The measurement system including a processor may be configured to identify veins in the hand or measure oxygen level in blood. The system may be used to identify an object or to measure physiological parameters. The system may also be coupled to a cloud service and use artificial intelligence in making decisions.

The embodiment of the invention provides a circuit breaker speed measurement method, device and equipment, a medium and a program product. The method comprises the following steps: performing a laser differential interference test on the motion process of the circuit breaker by using main laser and auxiliary laser, sampling the laser differential interference test according to a preset sampling frequency, performing state space modeling, correcting a modeling result according to real-time sampling data, and determining the state space of the circuit breaker according to the corrected modeling result. And the closing speed or the opening speed of the circuit breaker is determined according to the corrected data. Through differential measurement of the main laser and the auxiliary laser, angle drift and gas refractive index change caused by environmental interference can be compensated, measurement errors caused by the environment can be dynamically corrected based on state space modeling and real-time sampling data, and the displacement detection accuracy of circuit breaker opening and closing is improved. Therefore, the accuracy of circuit breaker opening and closing speed measurement is improved.

1. Name of the product in this design: Real-time Differential Measurement Device (ERT K60). 2. Purpose of this design: for high-precision measurement, mapping, and provision of high-precision location information. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

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.

The invention belongs to the related field of atom interference differential measurement devices, and discloses an atom interference differential measurement device for realizing a high-consistency double-atom fountain, which comprises a first interference unit, a first atom preparation and detection unit, a second interference unit and a second atom preparation and detection unit which are arranged in sequence, wherein the first interference unit and the second interference unit are respectively used for providing spaces for an atom interference process; and the first atom preparation and detection unit and the second atom preparation and detection unit are respectively used for forming horizontal trapping light and realizing atom trapping of the two three-dimensional magneto-optical traps together with the vertical trapping light. According to the invention, the structure of the whole device is further compact, atom trapping of two magneto-optical traps can be realized only by inputting three beams of trapping light, and the same pair of vertical trapping light can be utilized in the two trapping modules to carry out upthrowing operation on atoms, so that high-synchronism double-substance wave source preparation can be realized; the common-mode effect in atomic interference measurement can be better inhibited, and the requirement for optical power is greatly reduced.

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.

The application belongs to the technical field of flight control. The application provides a specified time increment control method for aircraft flow angle under multiple fault interference. The method comprises the following steps: establishing the dynamics equation of the aircraft flow angle and angular rate and converting it into a strict feedback linearization form; performing first-order Taylor expansion on the dynamics equation at the current sampling time to establish a control-oriented incremental model; designing a specified time flow angle controller and a specified time angular rate controller for the aircraft based on the control-oriented incremental model and the specified time theory to achieve specified time control of the aircraft flow angle. The disclosed embodiments have the advantages of simple structure and strong robustness, only require the state differential measurement information and control surface manipulation derivative of the aircraft, effectively reduce the dependence on accurate nonlinear terms in the aircraft model, and can still achieve accurate flow angle control under specified time even under multiple faults.

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.