17results about How to "Solving Measurement Errors" patented technology

The invention provides a material water content detection method and system based on dual-wavelength infrared light, and relates to the technical field of material detection.The method comprises the steps that an infrared light source is controlled to emit at least two infrared light of different wavelengths to irradiate the surface of a to-be-detected material; receiving reflected light signals of the surface of the to-be-detected material to the infrared light, and acquiring light intensity information of the reflected light signals corresponding to different wavelengths; the average absorbance value of the water content characteristic of the to-be-detected material is constructed according to the ratio relation between the light intensity information of different wavelengths; and performing environmental disturbance compensation on the average absorbance value to obtain a compensated average absorbance value, and inputting the compensated average absorbance value into a preset calibration model to output the water content of the to-be-detected material. According to the scheme, the stability and the reliability of the water content detection of the material in an actual application environment are improved, and the problem of measurement errors caused by environmental changes is solved.

This application discloses a precision capacitance sensing system, comprising a modulation signal source, a sensitive probe, a differential transformer bridge, a signal amplification link, an analog multiplier, and a low-pass filter circuit, all connected in sequence. It also includes a demodulation reference signal source, the output of which is connected to the second input of the analog multiplier. The demodulation reference signal source is used to generate a multi-frequency combination demodulation reference signal, which is composed of a fundamental frequency component and at least two harmonic components superimposed. This invention also discloses a precision capacitance sensing method. By employing a specially designed demodulation reference signal, this application ensures that the system output remains constant within a continuously varying range of the demodulation phase difference, thereby achieving complete insensitivity to phase difference fluctuations and effectively overcoming the performance bottleneck that has long constrained high-precision capacitance sensing.

The utility model belongs to the field of torque measurement, and particularly relates to a ball screw friction torque measuring device which comprises a base assembly, a fixing plate and a measuring assembly. A sliding groove is formed in the top of a base of the base assembly, and four mounting blocks distributed in a rectangular shape are arranged on the outer surface. A motor and an electric push rod are installed on the fixing plate. The motor transmits power through a coupler. The measuring assembly comprises a connecting block, a first clamping plate, a second clamping plate and a long bolt, the first clamping plate and the second clamping plate are embedded into the first torque sensor and the second torque sensor respectively, the bottom of the connecting block is in sliding fit with the sliding groove, and the output end of the electric push rod is fixedly connected with the connecting block. The electric push rod drives the measuring assembly to move on the sliding groove, clamping and position adjusting of the ball screws of different specifications are achieved, the double torque sensors are used for synchronously collecting friction torque data, and the measuring efficiency and reliability of the friction torque of the ball screws can be effectively improved.

A shaft power monitoring system based on wireless power supply and micro-strain measurement comprises a rotor, a stator, a wireless power supply system and a display end, the rotor part collects shafting strain signals through a strain gauge, and after signal conditioning and digital processing are completed through a microcontroller, non-contact transmission of data is achieved through a wireless transmitting module; meanwhile, electric energy required by operation is obtained through a wireless power supply receiving end and a rectifying circuit board; the stator part receives and analyzes data transmitted by the rotor through a wireless receiving module, and signal management and state monitoring are carried out by a microcontroller; meanwhile, a rotating speed measuring module arranged in the stator monitors the rotating speed of the shaft system in real time, and continuous and stable energy support is provided for the rotor through a direct-current power supply and a wireless power supply transmitting end. According to the invention, through combination of a high-precision micro-strain measurement technology, wireless power supply and wireless data transmission, technical difficulties of a traditional shaft power measurement system can be effectively solved.

The utility model relates to the technical field of detection equipment, in particular to a shaft voltage detection device which comprises a base, a vertical rod is arranged on the base, a ram is hinged to the upper end of the vertical rod, a carbon brush is detachably connected to the ram through a fixing clamp, and the carbon brush is connected with a data collector through a wire. One end of the first spring is connected to the vertical rod, and the other end of the first spring is connected to the ram; the fixing clamp comprises a first connecting part of a C-shaped structure, second connecting parts extending outwards are arranged at the two ends of the first connecting part respectively, the fixing clamp is fixed to the ram in a bolting mode through the two second connecting parts, and the carbon brush is placed in a groove of the first connecting part and locked and fixed through a first locking bolt and a first locking nut. According to the device, manual handheld measurement is replaced, and the twisting injury risk caused by a high-speed rotating shaft is avoided; the pressure between the carbon brush and the shaft is kept balanced during measurement through the elastic force of the first spring, the carbon brush is always in stable contact with the surface of the shaft during measurement, and measurement fluctuation is reduced.

The application discloses a kind of chromaticity instrument measurement display product chromaticity coordinate area determination method, including (1) chromaticity coordinate stability determination;(2) chromaticity target area optimization;(3) chromaticity target area attribution determination optimization;Traditional stability determination mode is single dimension, CIE1931 original chromaticity coordinate is provided in the form of discrete data with 1nm as wavelength interval, sampling interval is larger, precision is limited, traditional attribution determination is large in amount of calculation for chromaticity diagram of data point dense, according to covariance matrix construction minimum chromaticity ellipse, the spatial distribution characteristics of point set is determined by analysis chromaticity coordinate stability;Original chromaticity point is fitted using piecewise polynomial interpolation, and the coordinate precision is optimized to 0.01nm, two-stage rapid determination strategy is used, first based on polar angle realizes candidate sector preliminary screening, then in the local candidate sector obtained by preliminary screening, accurate determination is carried out using local ray method, and target area positioning of chromaticity coordinate is completed.

The utility model discloses a curved surface pressure sensor based on a magnetic field, and aims to solve the problem that when an existing flexible pressure sensor based on the magnetic field is matched with a complex curved surface, wiring of a PCB is complex, or the consistency of readings of different Hall elements is low, and consequently the accuracy of a measurement result is reduced. The device comprises a flexible magnet layer, a hard shell layer and a flexible printed circuit board, the hard shell layer is a curved surface, and the inner wall of the hard shell layer is uniformly provided with mounting grooves for placing the stiffening plates; the flexible printed circuit board is provided with a plurality of reinforcing plates which are arranged at intervals, and the plurality of Hall elements are arranged on the plurality of reinforcing plates in a one-to-one correspondence manner; the flexible printed circuit board is connected with the hard printed circuit board through a connector; the problem of adaptation to a complex curved surface is solved, the consistency of the interlayer spacing of the Hall sensor and the flexible magnet is kept, the measurement result of the sensor is more accurate and stable, and the sensor has the capacity of covering the shape of a complex product in a large range.

This invention discloses a method for error compensation of thin-film thermocouples based on recurrent neural networks, comprising: fabricating thin-film thermocouples using screen printing; performing temperature tests on the thin-film thermocouples; collecting thermoelectric potential data of the thin-film thermocouples and standard K-type thermocouples, and processing the collected thermoelectric potential data in the integrated development environment PyCharm; constructing a recurrent neural network in PyCharm, loading the dataset, adjusting the initial state of the neural network, and defining hyperparameters. This invention corrects and compensates for thermoelectric signals, solving the measurement error problem caused by cold junction temperature changes and manufacturing deviations in thin-film thermocouples on alumina ceramic cutting tools. It corrects and compensates for thermoelectric signal deviations caused by the rise in cold junction temperature during testing, as well as random errors present in the screen printing process, thereby improving the accuracy of the thin-film thermocouple sensor.

The invention discloses a metal pipeline anchor pattern degree detection method and system based on image analysis, and relates to the technical field of pipeline quality detection, and the method comprises the steps: collecting a panoramic image; identifying an independent anchor pattern depression core area; generating a contour mask of the independent anchor pattern recess; segmenting the anchor pattern depression contours to determine independent anchor pattern depression contours; determining the depth estimated value of the independent anchor pattern recess; screening key detection pits; dividing the key detection recesses into a plurality of measurement groups; controlling the photoelectric measuring head to project measuring light to the corresponding measuring group, and calculating actual depth data of the key detection recess based on the reflected light; and summarizing all actual depth data to obtain an anchor grain degree detection result. According to the method, the three-dimensional space coordinates of each anchor pattern recess can be accurately obtained, the deepest position of the anchor pattern can be directly positioned, meanwhile, key recesses which have great influence on the overall anchor pattern depth average value are screened out based on the anchor pattern depth estimated value, general recesses are ignored, and invalid measurement operation is directly reduced by more than 50%.

The application discloses a kind of voltage transformer measurement error and uncertainty online evaluation method and system, its method includes: the error correlation model between the two voltage transformers connected by overhead transmission line in transformer substation is constructed;Calibrated mutual inductor error distribution is input to the error correlation model, and the error distribution of uncalibrated voltage transformer is obtained based on Monte Carlo method;The measurement error and uncertainty of uncalibrated voltage transformer are obtained by optimal estimation to the error distribution of uncalibrated voltage transformer based on Bayesian fusion method.Based on the above data processing procedure, the application realizes the modeling and evaluation of mutual inductor measurement error and uncertainty, and is beneficial to the security and stability of power system and the fairness and justice of electric energy trade.

The utility model belongs to the technical field of shaft product detection equipment, and relates to a contact type device for detecting the outer diameter of a shaft, which comprises a bottom plate (222), two clamping mechanisms and a V-shaped block (211) for placing a shaft product, the two clamping mechanisms are mounted on the bottom plate through a clamping seat, and the clamping seat comprises a bearing (006), a bearing seat (219) and a rotating shaft (221); the clamping mechanism comprises a contact type displacement sensor (001), a duplex cylinder (002), a pull-down block (218), clamping blocks (216, 217), a guide shaft (212) and a measuring seat (225); wherein the measuring seat is fixed on the rotating shaft, the V-shaped block is provided with an opening for the guide shaft to stretch out and draw back, and the axial direction of the V-shaped block is perpendicular to the axial direction of the guide shaft. According to the utility model, the accuracy of outer diameter detection of shaft products is improved, and the device can be compatible with various shafts with different diameters and is used for detection of various diameters.

The utility model relates to the technical field of mining engineering, and discloses a depth measuring device for mining engineering, which comprises a hole measuring instrument and a base, the outer side of the hole measuring instrument is provided with a plurality of buckle assemblies, the base is provided with a plurality of clamping holes, each buckle assembly comprises a clamping sleeve, the interior of each clamping sleeve is connected with a clamping tongue in a sliding manner, and the clamping tongues are connected with the clamping holes in a sliding manner. Two springs are fixedly connected to the outer side of the clamping tongue, a shifting piece is fixedly connected to the top of the clamping tongue, a third sliding groove is fixedly connected to the top of the clamping sleeve, a second check block is slidably connected to the interior of the third sliding groove, and a third shifting column is fixedly connected to the left end of the second check block. According to the utility model, the clamping tongue in the buckle assembly is used for clamping the clamping hole, and the baffle block II is used for clamping the shifting piece to release the buckle state, so that the quick disassembly function of the hole measuring instrument and the base is realized, and the distance between the base and the ground is measured through the measuring scale of the hole measuring instrument, so that the problem of measurement errors caused by the distance between the base and the ground is solved.

The invention provides a turbine lubricating structure and a turbine, and relates to the technical field of turbines. The steam turbine lubricating structure comprises a static part, a rotating part and a lubricating mechanism, and the static part comprises a positioning pipe; the rotating part comprises a main shaft; the main shaft is connected with the positioning pipe through a bearing assembly of the lubricating mechanism, the bearing assembly comprises a bearing outer ring, a bearing inner ring, a ball and a magnetic stop block, the bearing inner ring is arranged on the main shaft in a sleeving mode, the bearing outer ring is fixed in the positioning pipe, and the ball is arranged between the bearing inner ring and the bearing outer ring; the magnetic stoppers are fixed on the surface of the bearing inner ring at intervals to separate the balls; the lubricating mechanism further comprises a storage conical hopper, a temporary storage pipe, a sealing piston and a magnetic piston block. Full-course automation of turbine lubrication is achieved through a magnetic drive piston linkage mechanism, the whole scheme is adaptive to severe scenes such as power generation and ships without modifying a main body structure, and the problems of energy consumption, service life and operation and maintenance are comprehensively solved.

The utility model discloses an accurate measuring device for a high-temperature thermocouple of a gasification furnace, which comprises a hollow guide rod and a pull rope, the pull rope is inserted on a clamping rod, and the clamping rod penetrates to the front end of the guide rod; one end of the pull rope penetrates through the clamping rod and then inwards penetrates into the guide rod; scales are engraved on the outer wall of the guide rod; the clamping rod is a hollow steel rod, a clamping hole is formed in the middle of the clamping rod, the pull rope penetrates in along the clamping hole, and one end of the clamping rod penetrates out and then enters the guide rod. According to the unique structural design, the device can be accurately clamped on the wedge-shaped opening plane of the gasification furnace, the problem of measurement errors caused by furnace brick scouring deformation in an existing measurement method is solved, and compared with a traditional measurement mode, the measurement precision is improved. And personnel are prevented from entering a limited space and working at a high place, potential safety hazards caused by related operation are eliminated from the source, and the personal safety of operators is guaranteed.

The application discloses a metal pipeline anchor concave degree detection method and system based on image analysis, and relates to the technical field of pipeline quality detection. The method comprises the following steps: collecting panoramic images; identifying independent anchor concave core areas; generating independent anchor concave contour masks; segmenting anchor concave contours to determine independent anchor concave contours; determining depth estimates of independent anchor concaves; screening key detection concaves; dividing the key detection concaves into multiple measurement groups; controlling a photoelectric probe to project measurement light to the corresponding measurement groups, calculating actual depth data of the key detection concaves based on the reflected light; and collecting all the actual depth data to obtain anchor concave degree detection results. The application can accurately obtain the three-dimensional space coordinates of each anchor concave, directly locate the deepest part of the anchor concave, and screen out key concaves that have a greater impact on the average value of the overall anchor concave depth based on the anchor concave depth estimates, thereby ignoring general concaves and directly reducing more than 50% of invalid measurement operations.

The invention discloses a non-contact unmanned aerial vehicle electrostatic charge measurement method and system considering stray capacitance influence, and relates to the technical field of electrostatic detection, and the method comprises the following steps: constructing an unmanned aerial vehicle charge quantity measurement model considering stray capacitance influence, and introducing the electrode space sensitivity to correct the deviation influence caused by cable stray capacitance; through a current conditioning circuit, electrode induced charge quantity changes caused when the unmanned aerial vehicle flies into an electrode sensitive area are converted into measurable electrostatic signals; performing feature extraction processing on the electrostatic signal to obtain an electrostatic signal zero crossing point moment so as to determine an unmanned aerial vehicle electrostatic charge measurement point coordinate and further determine the electrode space sensitivity; based on the electrode induced charge quantity and the electrode space sensitivity at the zero crossing point moment, determining the electrostatic charge quantity of the unmanned aerial vehicle and generating an electrostatic discharge risk assessment report of the unmanned aerial vehicle; the electrostatic charge quantity of the flying unmanned aerial vehicle is accurately measured, and the electrostatic discharge risk assessment report of the unmanned aerial vehicle is generated, so that the flying safety of the unmanned aerial vehicle is improved.

The application belongs to the field of light energy detection, and provides a light energy detection device and an equipment with a laser. The light energy detection device comprises a detection cavity and an adapter sleeve. The detection cavity is communicated with the adapter sleeve, and the inner wall profile shape of the adapter sleeve is consistent with the outer profile shape of a light emitting head. In the case of detecting the light energy of the light emitting head, the light emitting head is inserted into the adapter sleeve, and the end of the light emitting head enters the detection cavity. A position detection structure is arranged on the adapter sleeve. In the case that the distance between the detected object and the position detection structure is less than a preset distance, the position detection structure is triggered to generate a position signal. In this way, the measurement error problem caused by the inaccurate insertion position of the light emitting head can be solved. The insertion depth of the light emitting head is ensured to meet the requirements through the position detection structure, so as to improve the accuracy and consistency of the detection result and reduce the influence of human operation factors.