50results about How to "Avoid measurement bias" patented technology

The invention relates to a steel bar reverse bending test device, and belongs to the field of steel bar detection devices. The device comprises a rack and a workbench rotationally arranged on the rack. A supporting shaft is arranged on the rack; the supporting shaft penetrates through the workbench upwards and is coaxial with the workbench. A plurality of mounting holes are formed in the workbench; a bending block is inserted into any mounting hole; a working plate is arranged on the rack in the vertical direction in a sliding mode. A sliding rail is arranged on the working plate; scale marks are arranged in the length direction of the sliding rail. A first supporting piece is slidably arranged on the sliding rail. A first through hole is formed in the first supporting piece; a second supporting piece is arranged on the working plate; a second through hole is formed in the second supporting piece; the steel bars sequentially penetrate through the first through holes and the second through holes. A first image sensor is arranged on the rack; the method has the technical effects of avoiding manual calculation of the steel bar bending angle and improving the steel bar detection precision.

The application discloses a kind of no sampling resistance square wave control overcurrent protection method, method includes: real-time acquisition digital sampling sequence of direct current bus voltage, synchronous analysis logic state combination of three-phase PWM driving signal;According to the mapping table of pre-stored commutation state machine, the logic state combination is converted into current effective conduction phase identification, and the signal of corresponding current detection enable window is generated, and enable window is limited to the interval of voltage oscillation attenuation completion after PWM opening to before off before freewheeling protection;During the effective period of enable window, the digital band-pass filtering is carried out to bus voltage digital sampling sequence, the voltage drop component of characteristic frequency band is extracted, and the time-domain integral value and the rate differential value of voltage drop component are calculated.The application is reconstructed by the current of no sampling resistance technology and dynamic protection strategy, while reducing hardware cost, significantly improve system reliability, effectively solve the protection failure problem of traditional scheme under commutation interference, high-speed working condition and transient impact.

This application discloses a tool setting method and tool setting fixture for a vertical slotting machine, belonging to the technical field of tool setting devices. To address the problems of low tool setting efficiency and poor accuracy in existing vertical slotting machines, the tool setting fixture includes a central support plate. A triangular jaw is installed at the bottom of the central support plate. The tool setting fixture is installed at the inner hole of the workpiece to be processed via the triangular jaw. A support base for fixing a measuring device is installed on the front side of the central support plate. A tool setting sample block is detachably connected to the support base. The operator determines the tool setting position by cooperating with the measuring device and the tool setting sample block. This application is mainly used as a tool setting device for CNC vertical slotting machines.

The present invention discloses a method for monitoring the strain and modulus of an asphalt pavement based on an embedded strain sensor group. Strain sensors with different equivalent moduli are embedded in a pavement structure to form a strain sensor group. Based on a logistic curve model satisfied by the modulus ratio and strain ratio of the strain sensor group and the asphalt mixture, the actual strain and actual modulus of the asphalt mixture are solved according to the output of the strain sensor group, thereby overcoming the measurement deviation caused by the incoordination between the sensor and the asphalt mixture caused by temperature, achieving accurate monitoring of the true strain response of the pavement structure under any temperature condition, and further monitoring the modulus of the pavement structure; the strain and modulus of the asphalt pavement can also be measured without stopping the vehicle, which is more accurate than the traditional static measurement method of the asphalt pavement modulus, and can more accurately judge the actual health status of the pavement structure.

This application discloses a method for inverting insect wingbeat frequency based on initial phase calculation, relating to the field of radar measurement technology. The method includes: establishing a radar echo model of insect wingbeat motion containing amplitude and phase initial phases; acquiring micro-motion signals from the collected insect echoes based on the model to generate a micro-Doppler spectrum; calculating the phase initial phase value of the insect wingbeat based on the micro-Doppler spectrum; constructing a phase compensation factor based on the phase initial phase value to obtain a wingbeat parameter plane; detecting energy peaks in the wingbeat parameter plane based on the phase compensation factor; and determining the insect's wingbeat frequency based on the position of the energy peaks. This application, by introducing phase and amplitude initial phases, recreates the dual physical processes of wing movement and body micro-motion during insect wingbeat, making the radar echo model highly consistent with the actual signal generation mechanism, reducing errors, and improving anti-interference capabilities.

The utility model relates to the technical field of tank car filling metering, in particular to a low-temperature liquid tank car filling metering device. According to the technical scheme, the filling metering device for the low-temperature liquid tank car comprises a plug, an inner fixing plate, a tank and an outer fixing plate, a window is formed in one end of the tank, the outer fixing plate is installed in the window of the tank, the inner fixing plate is installed at the position, corresponding to the outer fixing plate, of the interior of the tank, and the plug is connected with the inner fixing plate. The inner fixing plate and the outer fixing plate are locked and fixed through bolts, a tuning fork type liquid level meter is installed on the outer fixing plate, a measuring head is arranged at the end, located in the tank, of the tuning fork type liquid level meter, and a controller is arranged at the end, located on the outer side of the tank, of the tuning fork type liquid level meter. The problem that the filling weight is overloaded due to the fact that the mechanical liquid level meter is jammed and frozen to death can be effectively solved, and the safety and the accuracy of the filling process are guaranteed.

The application provides a method for detecting biochemical oxygen demand in sewage, and belongs to the field of oxygen demand detection. The method comprises the following steps: forming a fluorine-containing organosilicon nano coating on the electrode surface of a dissolved oxygen sensor of a full-automatic BOD5 analyzer to obtain a fluorine-silicon modified dissolved oxygen sensor; pretreating the sewage to be detected in an adsorption column composed of modified activated carbon and porous silica gel to obtain a pretreated water sample; fixing bacillus subtilis on a porous carrier and then putting the carrier into the pretreated water sample to obtain an inoculated water sample; measuring the initial dissolved oxygen of the inoculated water sample and the end-point dissolved oxygen after 5-day culture; and obtaining the five-day biochemical oxygen demand in the sewage according to the initial dissolved oxygen and the end-point dissolved oxygen. Through the four-level collaborative system of "sensor anti-interference optimization, sample purification and enrichment, microbial reaction standardization and accurate signal acquisition", the application systematically eliminates the error sources in the traditional BOD5 detection, and realizes the accurate measurement of the organic matter pollution level in complex sewage.

The utility model discloses an engineering measuring device capable of preventing vibration offset, which comprises a mounting adjusting part, a support fixing frame, a fixing insertion rod and a theodolite, the bottom end of the mounting adjusting part is uniformly and fixedly connected with three rotating connecting blocks, the mounting adjusting part is in threaded connection with a fixing bolt, and the fixing bolt is fixedly connected with the support fixing frame. A supporting column is fixedly connected to the middle of the inner side of the top end of the mounting adjusting part, an inserting groove is formed in the middle of the supporting column, a movable inserting groove is formed in the side, located in the inserting groove, of the supporting column, a fixed arc plate is arranged on the inner side of the movable inserting groove, and a limiting circular ring is fixedly connected to the outer side of the fixed arc plate. Through the design of the damping rotating shaft and the fixed inserting rod, the device can provide high stability during measurement, the damping rotating shaft ensures that the supporting fixing frame can stably stay at a designated position after stopping rotating, the fixed inserting rod can firmly fix the device on the ground, and measurement deviation caused by vibration is prevented.

This invention discloses a method for online sodium ion monitoring in steam and water supervision, belonging to the technical field of steam and water quality monitoring in thermal power plants and large industrial boilers. This method is a graded monitoring approach for online sodium ion monitoring in steam and water systems. By setting differentiated monitoring strategies at key nodes and combining intelligent diagnostic algorithms with optimized operation and management measures, it achieves a shift from "post-event detection" to "pre-event early warning," improving the timeliness, accuracy, and reliability of steam and water quality supervision.

The utility model provides a scraper fineness meter calibrating device which comprises a calibrating workbench, a calibrating jig, a scraper fineness meter, a driving case, a calibrating screw rod, a driving motor and an identifying structure, the calibrating jig is installed at the front end of the surface of the calibrating workbench, the scraper fineness meter is placed on the calibrating jig, and the driving case is installed on the calibrating screw rod. The driving case is mounted at the rear end of the surface of the verification workbench; the verification screw rod is mounted in front of the driving case, the driving motor is fixedly mounted at the top of the driving case, and an output shaft of the driving motor is connected with the verification screw rod; the identification structure is slidably mounted in front of the driving case and is engaged with the verification screw rod; according to the utility model, with the arrangement of the verification tool and the identification structure, a large amount of workers are not required to participate in verification, the accuracy of obtained information is high, and the verification process is simple.

The oil temperature control system comprises a hydraulic oil tank, a controller, an oil tank cooling loop, an oil tank circulation loop and a station temperature sensor, the hydraulic oil tank is divided into a hot oil area and a cold oil area, an oil suction port of the oil tank cooling loop is arranged in the hot oil area, and an oil outlet of the oil tank cooling loop is arranged in the cold oil area; the oil tank cooling loop is used for cooling oil in the hot oil area and conveying the oil to the cold oil area; the oil tank circulating loop is used for circularly mixing the oil on the upper layer and the lower layer of the cold oil area; the controller is used for adjusting the cooling efficiency of the oil tank cooling loop according to data of the station temperature sensor. The oil suction port of the oil tank cooling loop is formed in the hot oil area, oil in the hot oil area is cooled and then flows back to the oil tank cold oil area, and the overall temperature of the oil tank is uniform. An oil tank circulation loop is arranged in the oil tank cold oil area and pumps cold oil on the lower layer of the oil tank to the upper layer of the oil tank in the cold oil area, and temperature uniformization of the cold oil area is accelerated.

The invention relates to the technical field of data processing of multi-source data fusion, and discloses an investigation data integration analysis method and system based on multi-source data fusion. According to the scheme, a multi-source sensor is deployed, original voltage is collected, and standardization is carried out in each physical quantity range; constructing temperature, pressure and vibration three-dimensional observation and states based on a unified time index, and setting initial values; recursive prediction is carried out by using a constant preserving model; counting a multi-measuring-point variance in a static window, determining observation noise in combination with the minimum quantization step size, and calculating fusion gain; linearly updating and correcting covariance, and then carrying out dimension-by-dimension amplitude limiting according to an abnormal upper limit; carrying out space averaging on the three-dimensional results of the multiple measuring points at each sampling moment, and carrying out rollback if necessary; and a fusion sequence and a statistical report are formed in the whole cycle. According to the method, the data scale is unified, subjective parameters and computing power burden are reduced, adaptive noise modeling along with the environment is achieved, stable noise suppression and fault resistance are achieved, and continuous output and comparable analysis are guaranteed.

The utility model discloses a kind of for inspecting the length of annular class sealing strip, and the utility model discloses a kind of inspection tool, including movable assembly, fixed assembly, supporting assembly, sliding assembly, rocker assembly, gravity component;Fixed assembly is fixedly arranged on supporting assembly, and several sliding assemblies are arranged on supporting assembly;Movable assembly is installed on supporting assembly by sliding assembly;Rocker assembly connects fixed assembly with movable assembly;Gravity component connects movable assembly with supporting assembly, sealing strip is installed on fixed assembly, after releasing rocker, gravity component drives movable assembly to move along sliding assembly.This application successfully combines three high efficiencies of easy operation, space economy and result accuracy, becomes a kind of modern online detection solution that is integrated with low cost, high efficiency, high reliability.

This invention discloses a pressure gauge testing device, relating to the field of pressure gauge testing technology. The device includes a first housing, with vertical plates fixed to both sides of the first housing. A top plate is horizontally fixed to the upper end of the vertical plates, and several electric telescopic rods are vertically fixed to the lower end of the top plate. A second housing is horizontally fixed to the output end of the electric telescopic rods. The second housing is equipped with a clamping and fixing mechanism. Testing mechanisms are provided on the first housing, the top plate, and the second housing. A conical block is fixed to the upper end of the first housing below the second housing. A sealing gasket is fixed to the side wall of the conical block, and a limit tube is vertically fixed to the upper end of the conical block. A gas supply mechanism is provided inside the first housing. This invention uses the clamping and fixing mechanism to center and clamp the pressure gauge under test, uses the electric telescopic rods to press the connection end of the pressure gauge under test to the sealing gasket to form a sealed connection, and introduces gas through the gas supply mechanism and uses the testing mechanism to automatically complete the dual testing of accuracy and sealing performance.

The invention discloses an optimization method in a discrete data transmission process of a motor. A conjugate gradient method is used to process the encoded discrete data at the motor input end and the decoded discrete data at the motor output end during the transmission process. The discrete data are the angles measured by the inner ring of a motor magnetic encoder and the angles measured by the outer ring. The angles measured by the inner ring of the magnetic encoder are the encoded discrete data at the input end during the transmission process. The decoded discrete data at the output end calculated by a function model is compared with the original decoded discrete data at the output end, thereby solving the measurement deviation of the inner and outer ring positions of the magnetic encoder using two sensors. A function model is established, and the angle measured by the inner ring is substituted into the function model for calculation and converted into the outer ring angle. The data error precision is reduced, the bit error rate BER is reduced, the discrete data transmission time is reduced, the transmission precision is improved, the transmission anti-interference ability is improved, and the data transmission speed is improved and the response is accelerated during the transmission process.

This invention discloses a radiation dose measurement method and system based on dual-decision level and vertical fusion, solving the technical problem that existing radiation dose measurement methods ultimately lead to poor accuracy of radiation dose measurement results. The method includes configuring a dedicated monitoring area in a 3D NAND flash memory chip, integrating idle physical blocks within it to obtain an independent monitoring area; performing programming writing and multi-reference voltage scanning on the main monitoring block within the area, outputting dual-decision levels; based on the physical page mapping relationship of the main monitoring block, forming monitoring sampling groups according to vertical positions and counting the total number of bits in each sampling group; performing dual-reference voltage reading based on the dual-decision levels and the total number of bits, outputting the truncated cumulative probability; screening valid monitoring sampling groups and extracting their threshold distribution mean, performing baseline alignment and dose inversion, and finally outputting the radiation dose estimate.

This invention provides a power device temperature rise detection apparatus and method, relating to the field of power device temperature rise detection. The detection apparatus includes an optical path system and a signal processing system. The optical path system includes a light source, a beam splitter group, a measuring mirror, and a reference mirror. The measuring mirror can be fixed to the power device under test. The light provided by the light source is split into two beams by the beam splitter group. The two beams are reflected back to the beam splitter group by the measuring mirror and the reference mirror, respectively, producing a Michelson interference phenomenon. The signal processing system is used to acquire and process the interference fringe signal, and the calculation software obtains the displacement of the measuring mirror caused by the temperature rise of the power device, thereby deducing the temperature rise of the power device under test. Using this detection apparatus for temperature rise measurement is a non-contact measurement, effectively avoiding measurement deviations in traditional thermocouple measurements. Furthermore, by utilizing the principle of light interference for displacement measurement and then deducing the temperature rise, it offers high sensitivity and accuracy, ensuring the reliability of power device temperature rise detection.

The utility model relates to a multiband temperature measuring device for tin metallurgy. The multiband temperature measuring device for tin metallurgy comprises a box body, the mounting groove is formed in the rear end in the box body and is used for mounting the spectrum analyzer and the laser generator; the mounting hole group is formed in the front wall of the box body and is used for allowing the front ends of the infrared camera, the laser device, the visible light device and the optical fiber component to pass through and be positioned; and the adjustable supporting assembly is arranged at the front end in the box body and is used for allowing the middle rear parts of the infrared camera, the laser device, the visible light device and the optical fiber assembly to penetrate through. According to the application, the infrared camera, the laser, the visible light device and the optical fiber assembly are integrated in the box body for cooperative work, spectral information is collected in multiple bands and fused and analyzed, and infrared temperature measurement influenced by metal surface radiation characteristics is not simply depended any more, so that temperature information is accurately obtained; measurement deviation caused by radiation characteristics of the metal surface is effectively avoided, and the measurement precision is improved.

The invention discloses a KRW silanization heating type ambient air sampling header pipe, and belongs to the technical field of ambient air monitoring, the KRW silanization heating type ambient air sampling header pipe comprises an upper pipe, a lower pipe (heating section), an intelligent temperature controller and a fixing frame, and the sampling flow, the sampling fan power, the sampling pipe heating power and the temperature and humidity in the sampling pipe can be monitored in real time. And the inner walls of the upper pipe and the lower pipe are subjected to silanization treatment, the requirement for monitoring volatile organic compounds in newly added monitoring items is met, and a plurality of gas sampling and pushing mechanisms are arranged in the lower pipe of the first connecting frame. By adopting the gas flow optimization mechanism and the gas sampling pushing mechanism, the gas flow disturbance is enhanced, the potential dead zone or irregular flow is broken, and the gas flow in the sampling area is always in a dynamic state, so that the gas collection comprehensiveness is improved, the data accuracy and continuity are ensured, and the problem of pipe wall condensation is fundamentally solved.

The utility model discloses a new energy controller motor temperature sampling circuit, which is characterized by comprising a power supply filter circuit, a temperature signal sampling circuit, a drive control module and a signal conditioning and amplifying module, the power supply filter circuit is connected with the driving control module, the temperature sampling circuit is connected with the driving control module, and the driving control module is connected with the signal conditioning and amplifying module. The motor temperature sampling accuracy is improved, the motor temperature sampling is not easily influenced by the temperature, the motor temperature sampling reliability is effectively improved, and the motor is protected more timely.

The invention belongs to the technical field of power electronics, and discloses an on-line monitoring method and system for the on-resistance of a GaN power device, and the method comprises the following steps: in a testing process, firstly, measuring the junction temperature of the GaN device in real time through thermo-sensitive electric parameters; then, the working environment where the GaN device is located is adjusted through an environment control module, and it is ensured that the junction temperature is stabilized at the preset fixed temperature; after the junction temperature is stable, acquiring data of the GaN device in a conduction state by synchronously sampling conduction voltage and current; and finally, calculating the conduction resistance value of the GaN device based on the collected conduction voltage and current data. The system comprises a junction temperature measuring module, an environment control module, a sampling module and a microcontroller. According to the method, the junction temperature of the GaN power device is stably controlled under a fixed condition in the online measurement process, and then conduction voltage and current sampling is carried out, so that the influence of temperature fluctuation on a conduction resistance measurement result is effectively eliminated, and the measurement data has higher accuracy and comparability.

The application discloses an anti-fuel-micro-water-content capacitive on-line detection probe self-calibration structure, relating to the technical field of fuel engine micro-water detection, which comprises a fuel bypass sampling pipe and a detection device, the detection device is obliquely arranged on one side of the fuel bypass sampling pipe, the detection device comprises a self-calibration assembly and a capacitive detection piece, the capacitive detection piece is movably arranged in the self-calibration assembly, and the self-calibration assembly comprises a sealed pipe body and an outer protective shell, the sealed pipe body is hollow inside as a main part of the self-calibration assembly, one end of the sealed pipe body connected with the fuel bypass sampling pipe is an opening, a control valve is fixedly installed at the opening end, and the outer protective shell is arranged around the outer side of the sealed pipe body and forms a water accumulation cavity with the outer wall of the sealed pipe body; a sealing baffle is arranged, the sealing baffle divides the hollow cavity into two cavity bodies, and the cavity body close to the fuel bypass sampling pipe is a front-end cavity, and the application eliminates oil temperature interference through real-time dynamic compensation of temperature, and realizes long-term undismantling precise on-line detection of the probe.

The invention discloses a size inspection system for stainless steel pipe production, and relates to the technical field of stainless steel pipe detection. According to the invention, the external diameter of the steel pipe is obtained through cooperation of the pressing external diameter detection roller and the detection support roller by using the resistor strip and the contact sliding needle; and a closed loop is formed by the voltage-adjustable conductive contact roller to measure the inner diameter and the wall thickness. All the roller axes are perpendicular to the moving direction of the steel pipe, it is ensured that accurate online size detection is achieved in continuous production, the device can adapt to steel pipes of various specifications through rapid replacement and structure adjustment, and the detection efficiency and quality are greatly improved.

The invention provides equipment and a method for measuring lodging resistance of rice, and relates to the technical field of agricultural machinery. The equipment comprises a vertical supporting rod and an overturning supporting rod hinged to the lower end of the vertical supporting rod, a thrust measuring part is installed at the hinged position, a straw holding assembly and a lower straw shearing assembly are integrated on the thrust measuring part, and a mass measuring part and a power supply battery are arranged on the vertical supporting rod. The method comprises the following steps: measuring internode breaking strength; selecting rice plants and measuring the height; bundling at a position 20cm away from the ground surface; applying a thrust to incline for 45 degrees, and measuring the thrust; after shearing, weighing the weight of the upper part; and calculating a bending moment and a lodging index. According to the scheme, thrust, weight and shearing parameters are synchronously obtained through an integrated structure, the field test efficiency and data accuracy are improved, manual operation errors are reduced, and the method can be used for evaluating the lodging resistance of rice.

The invention provides a precision cooperative measurement and control method under wind tunnel multi-system cross operation, and belongs to the technical field of wind tunnels. A distributed pressure sensor array and a flow field monitoring network are established, and a flow field cooperative compensation optimization model is utilized to output real-time correction parameters for spatial position correction; temperature drift model compensation and optical pose closed-loop control are adopted to eliminate temperature and load influences, a test process is optimized through a multi-stage decision model, a state observer is used for soft measurement of a flow field state, and multi-source data are integrated to trigger adaptive sampling and online calibration. The technical problem that it is difficult for a multi-measurement system to achieve cooperative and consistent precision in spatial distribution and time sequence is solved.

The application discloses a kind of metrology machine, belong to integrated circuit technical field, the metrology machine includes: metrology optical system, magnetic levitation wafer workstation and at least three gratings;Metrology optical system and grating are located in the upper of magnetic levitation wafer workstation;The position of metrology optical system is fixed;Grating is arranged along the circumferential direction of metrology optical system;Magnetic levitation wafer workstation includes magnetic levitation workstation, wafer chuck and at least three position sensor readheads;Wafer chuck and position sensor readhead are arranged on the surface of magnetic levitation workstation close to metrology optical system;Position sensor readhead is arranged along the circumferential direction of wafer chuck;When measuring wafer, each grating and the light signal interaction of corresponding one position sensor readhead with grating is carried out to measure the position information of magnetic levitation wafer workstation.The application can accurately control magnetic levitation wafer workstation to realize 6 degrees of freedom motion, to reduce transmission error, improve motion accuracy.

The utility model discloses a steel sheet pile retaining wall soil pressure testing device considering the influence of medium principal stress, which relates to the field of wall soil pressure and comprises a ground, a model groove is arranged at the top of the ground, an opening and closing component is arranged on the side wall of the model groove, two first steel plates are symmetrically arranged on the inner side wall of the model groove by taking the center of the model groove as the axis, and two second steel plates are symmetrically arranged on the inner side wall of the model groove. A pressure component is arranged at the position, close to the center, of the inner wall of the model groove, an impact component is arranged on the outer wall of the model groove, a fixing component is arranged on the side wall, close to the ground, of the model groove, and a rainwater simulating device is arranged above the model groove and comprises a cover plate arranged above the model groove. A water storage tank is embedded in the side wall of the cover plate, and a plurality of water outlets are embedded in the side wall of the water storage tank. According to the utility model, through the opening and closing part, the pressure part, the impact part, the fixing part and the rainwater simulation device, the soil pressure value under the intermediate principal stress influence and the humid state can be measured.

The application relates to a synchronous transmission mechanism and a fixed bridge type image measuring instrument, which comprises a first transmission belt, a second transmission belt, a transmission shaft and a pre-tightening device; the transmission shaft is provided with sixth rotating wheels and seventh rotating wheels with equal diameters at two ends; the first transmission belt is in mesh transmission with the sixth rotating wheels; the second transmission belt is in mesh transmission with the seventh rotating wheels; the first transmission belt comprises a first part and a second part, and the second transmission belt comprises a third part and a fourth part; the first part of the first transmission belt is in transmission connection with a measuring head, and the third part of the second transmission belt is in transmission connection with a bottom light device; or the second part of the first transmission belt is in transmission connection with the measuring head, and the fourth part of the second transmission belt is in transmission connection with the bottom light device; the pre-tightening device is used for tensioning at least one of the first transmission belt and the second transmission belt. The synchronous transmission mechanism and the fixed bridge type image measuring instrument have the advantages of high measuring precision.

The invention relates to an antenna switch testing method and device, electronic equipment and a storage medium, and the method comprises the steps: enabling a power measurement unit to be connected to a pin of an antenna switch under the condition that the antenna switch in network access equipment is determined to enter a static working mode, the static working mode is used for providing a non-interference test environment for measuring the static power supply current of the antenna switch; continuously sampling the pin current of the antenna switch under the fixed voltage through the power measurement unit, and determining a current average value; and if the current average value exceeds a set current range, determining that the antenna switch is unqualified. According to the invention, the reject ratio of production calibration of the network access equipment is reduced.