5335 results about "Measuring instrument" patented technology

The invention discloses an indoor water tank sediment starting speed measurement system and method, and aims to solve the technical problem that data accuracy is affected due to the fact that a sensor disturbs a flow field in an existing measurement method. The core of the technical scheme is that the non-contact measurement characteristic of the PIV technology is applied to the whole process from flow field construction to data acquisition. The device is mainly composed of an imaging unit, a laser lighting unit, a movable sliding frame, a water flow adjusting unit and a buffer plate. Optical measurement is carried out through the imaging unit and the laser illumination unit, a physical sensor does not need to be arranged in a flow field, and interference of a measuring instrument on a water flow structure and a sediment starting process is fundamentally avoided. The movable sliding frame which is integrally designed integrates the functions of sediment laying, particle throwing and measuring, so that a test area can be quickly positioned; and the buffer plate and the water inlet and drainage adjusting unit are combined, so that a gradually-changed flow field from weak to strong can be accurately and stably simulated.

The invention relates to the technical field of laser measuring equipment, and discloses laser length measuring equipment for caution light production, which comprises a supporting seat, a rotating table rotationally mounted at the top end of the supporting seat, a laser measuring instrument arranged above the rotating table and a plurality of fixing assemblies arranged on the rotating table, a driving mechanism for driving the rotating table to rotate is arranged on the rotating table; through meshing arrangement of a first bevel gear and a second bevel gear in the synchronous driving assembly and a threaded transmission structure of a driving screw rod and a sliding block, synchronous movement of a clamping plate driven by a plurality of vertical plates is achieved, it is ensured that a warning lamp cover is accurately positioned to the axis position of the detection table, and the detection efficiency is improved. Therefore, the laser measuring instrument can accurately irradiate the center position of the top end of the lampshade, the problem of large measurement data deviation caused by insufficient positioning precision in the prior art is effectively solved, and the detection precision is remarkably improved.

The invention relates to the technical field of electrical measurement, and discloses an electrical measurement instrument dynamic calibration error compensation method, which comprises the following steps: S1, multi-source data real-time acquisition: integrating a temperature sensor, a humidity sensor and an electromagnetic interference detection module in a measurement instrument, configuring voltage, current, frequency and other measurement channels, and carrying out multi-source data real-time acquisition at the frequency of not less than 100HZ; environmental parameters (temperature T, humidity H and electromagnetic interference intensity E) and measurement data (model characteristic parameters X1, X2,..., Xn such as voltage, current and frequency) are synchronously acquired. According to the electrical measuring instrument dynamic calibration error compensation method, through multi-source data real-time acquisition and composite error model construction, in combination with multiple linear regression and an improved BP neural network, environment and measurement signal changes are comprehensively captured, an error compensation value is accurately calculated, a measurement error can be effectively controlled within an extremely small range, and the error compensation accuracy is improved. Compared with a traditional method, the measurement precision is greatly improved.

The invention discloses a soil heavy metal content estimation method and device, and relates to the technical field of soil heavy metal estimation.The method comprises the steps of sample collection and data acquisition, specifically, based on geographic information of a research area, soil samples are collected through a layered and partitioned sampling method; according to the method, comprehensive and accurate collection and data acquisition of soil samples are realized through a layered and partitioned sampling method in combination with a high-precision positioning and measuring instrument, the sample representativeness and the data accuracy are ensured, and through an improved correlation analysis algorithm and a depth model based on feature fusion, the soil sampling accuracy is improved. Accurate analysis and efficient modeling of correlation between environmental magnetic parameters and heavy metal content are realized, prediction precision is improved, dynamic optimization of model parameters is realized by applying a self-adaptive step length strategy in model verification and optimization, model stability and generalization ability are guaranteed, and all modules of the device work cooperatively, so that the reliability of the device is improved. And deep analysis of heavy metal sources and migration and transformation rules is realized by using a geochemical analysis module and related models.

The invention provides a gas compressor moving blade tip clearance measuring method and device, and belongs to the field of aero-gas turbine gas compressors. The problems of low measurement precision, low measurement efficiency and small measurement range in the prior art are solved. The method comprises the following steps that an angle encoder is installed on a main shaft, and a three-dimensional laser profile measuring instrument is arranged on the blade tip side of a blade at intervals; the impeller is rotated, the three-dimensional laser profile measuring instrument scans the blade tip, and three-dimensional point cloud data of the whole circle of blade tip profile are obtained; after the casing and the impeller are assembled, a plurality of continuous blades on the impeller are detached, and the three-dimensional laser profile measuring instrument is arranged at the vacant position of the impeller; the impeller is rotated, the three-dimensional laser profile measuring instrument scans the inner wall of the casing, and three-dimensional point cloud data of the whole circle of the inner wall of the casing are obtained; processing data; registering the processed three-dimensional point cloud data of the blade tip contour and the processed three-dimensional point cloud data of the inner wall in the same coordinate system to form a registration model; and the blade tip clearance value of the whole circle is calculated. The method is mainly used for measuring the blade tip clearance.

A test and / or measurement instrument includes at least three ports and at least three measurement circuits connected to the at least three ports, respectively. The test and / or measurement instrument further includes at least one signal generator circuit and a control circuit. The control circuit is configured to set a first calibration mode and carry out a first test of the instrument by measuring the calibration signal travelling from the signal generator circuit to the respective port as well as a signal traveling from the respective port to the signal generator circuit. The control circuit is configured to set a second calibration mode and carry out a second test of the instrument by measuring the calibration signal forwarded only to the main port in the first sub-mode and the calibration signal received by the respective port from the signal generator circuit via the main port in the first sub-mode.

The invention relates to the technical field of ship construction, and discloses a ship annular block assembly method, which comprises the following steps of: drawing a corresponding ship body center line, a ship body longitudinal section line, a ship body rib detection line and a ship body waterline in an overall design drawing of a ship body according to the actual segmentation condition of the ship body; marking is correspondingly drawn on the built bottom section, the built broadside section and the built transverse bulkhead section in sequence as the basis; a bottom center line, a bottom rib detection line, a broadside longitudinal section line, a broadside rib detection line, a transverse bulkhead center line and a transverse bulkhead rib detection line are used for alignment and adjustment to replace data measurement of closure openings in the prior art so as to achieve alignment and butt joint of the closure openings. The problem that the alignment precision is poor due to the fact that a closing opening data measuring instrument cannot be arranged due to the narrow total assembly site is solved, the total assembly precision is guaranteed, and then the structural strength, water tightness and overall precision of a ship body are guaranteed.

The invention belongs to the technical field of three-coordinate measuring instruments, and particularly relates to a gear three-coordinate measuring instrument which comprises a measuring table, a Y-axis guide rail is installed on one side of the upper end face of the measuring table, a first displacement frame is arranged on the Y-axis guide rail in a sliding mode, an X-axis guide rail is installed on one side of the first displacement frame, and a sliding block is arranged on the X-axis guide rail in a sliding mode. A Z-axis guide rail is installed on one side of the sliding block, a lifting rod is arranged on the Z-axis guide rail in a sliding mode, and a rotating column is rotationally arranged at one end of the lifting rod. By means of the adjustable gear feeding assembly, continuous feeding and measurement of a plurality of gears are achieved. According to the assembly, before the electric clamping jaw conducts clamping, the gears which are originally stacked in a mess are arranged in an ordered state, so that the electric clamping jaw can conduct accurate clamping only by running according to a preset track, and clamping difficulty and errors caused by mess gear stacking are effectively avoided.

The invention discloses a measuring instrument for measuring the roundness of an inner ring and an outer ring of an automobile hub bearing, and particularly relates to the field of bearing roundness measurement, the measuring instrument comprises a working table, a rotating disc is arranged on the upper surface of the middle of the working table, an adsorption cavity is embedded in the surface of the middle of the working table, and air holes are formed in the surface of the rotating disc; a driving gear is fixedly connected to the outer wall of the middle of the driving shaft, a blade fan shaft is arranged on one side of the inner wall of the adsorption cavity through a bearing, a blade fan gear is fixedly connected to the outer wall of the middle of the blade fan shaft, a spiral blade fan is fixedly connected to the outer wall of the top of the blade fan shaft, and a measurement supporting assembly is arranged on one side of the rotating disc. An auxiliary adjusting assembly is arranged on the side, away from the measurement supporting assembly, of the rotating disc. According to the device, the spiral blade fan can be automatically driven to rotate through the rotation of the rotating disc, so that the workpiece is adsorbed, no mechanical clamping trace exists, the hub bearing workpiece is fixed through the assistance of adsorption force, and the detection stability is improved.

The invention discloses a multi-discharge efficient precision machining device and method for a milling cutter. The multi-discharge efficient precision machining device comprises a high-precision machining tool, an electric spark machining pulse power supply, a discharge monitoring device and a detection device. The high-precision machining machine tool comprises an electric spark machining machine tool, a spindle, a grinding wheel, a workbench and a machine tool body. The main shaft supports accurate movement in three directions; stable and controllable pulse current and voltage are output through the electric spark machining pulse power supply; a voltage probe and a current probe are arranged on the discharge monitoring device, and discharge voltage and current data are collected in real time through the voltage probe and the current probe; the detection device comprises a non-contact optical measuring instrument, the abrasion of the grinding wheel is monitored through the non-contact optical measuring instrument, meanwhile, the machining allowance of the milling cutter blank placed on the workbench and the size precision after finish machining are measured, and the surface quality of the milling cutter is detected; the machining precision and efficiency of the milling cutter are improved, and efficient precision machining of the milling cutter is achieved.

The invention discloses a roll gap measuring instrument and an integrated continuous casting machine online roll gap measuring device, and aims to improve the precision of roll gap measurement and the convenience of operation. The roll gap measuring instrument comprises a mounting frame and a measuring assembly. The measuring assembly comprises a swing arm, a first elastic piece, a shifting block, a detection piece and a first detector. The swing arm is rotationally connected with the mounting frame, the shifting block is connected with the swing arm, and meshing teeth are arranged on the shifting block. The first detector is installed on the installation frame, the detection piece is in sliding fit with the first detector, and a rack meshed with the meshing teeth is arranged on the detection piece. The first elastic piece is used for driving the detection piece to return to the initial position. When the swing arm drives the shifting block to rotate, the shifting block drives the detection piece to move, the swing amplitude of the swing arm is calculated according to the moving distance of the detection piece, and then the roller gap between the rollers to be measured is obtained. According to the roll gap measuring instrument, through cooperation of the swing arm, the shifting block, the detection piece and the first detector, high-precision measurement of the roll gap is achieved, and the accuracy and reliability of a measurement result are improved.

The invention discloses an indoor water tank sediment pushing characteristic acquisition system and method, the system mainly comprises a water tank main body, a buffer unit, a drainage adjusting unit, a sediment throwing device, an imaging unit, an adjustable support and a data processing unit, and according to the method, non-contact data acquisition is carried out through a high-definition camera and a three-dimensional terrain measuring instrument; automatic identification, parameter extraction and migration speed calculation of landforms such as sand waves are achieved, the sediment bed surface is not touched in the whole process, damage to the bed surface form caused by traditional contact type measurement is eliminated, and the authenticity and reliability of data are ensured. Meanwhile, the buffer design of the combination of the flow slowing plate and the multi-stage water baffle is adopted, the kinetic energy of water flow is effectively dissipated through the graded water outlet structure, the impact force of injected water flow is greatly reduced, the bed surface is prevented from being scoured in the initial water injection stage, and the stability of the initial test condition is powerfully protected.

The present invention is a parameter estimation method for compartment model based on physics-informed neural networks. Starting from a physical model, the method extracts information from an AIF and a small amount of measurement data to obtain kinetic parameters, thereby greatly improving the scanning efficiency of a measuring instrument, and reducing occurrence of inaccurate estimation results due to patient movement. In addition, the present invention has the robustness to AIF noise and measurement data noise, and can flexibly arrange the time of data acquisition, reduce an error of inaccurate estimation caused by long time 10 acquisition and the patient movement, and improve the efficiency of data acquisition of the instrument. Experimental results show that the present invention is more stable and has less errors. Meanwhile, the present invention does not require the setup of training datasets, and is superior to an end-to-end supervised reconstruction method U-net network with fewer samples.

A method for surveying an environment by a movable surveying instrument with a progressional capturing of 2D-images by at least one camera and applying a visual simultaneous location and mapping algorithm (VSLAM) or a visual inertial simultaneous location and mapping algorithm (VISLAM) with a progressional deriving of a sparse evolving point cloud of at least part of the environment, and a progressional deriving of a trajectory of movement. The method comprises a progressional matching of the sparse evolving point cloud with a previously derived 3D-geometry, with a minimizing of a function configured to model a distance between the sparse point cloud and the previously derived 3D-geometry and deriving a spatial localization and orientation of the surveying instrument. At least one surveying measurement value of the environment by a spatial measurement unit is combined with the sparse point cloud or the previously derived 3D-geometry.

The invention provides a laser, inertia and image recognition combined calibration method and system. Comprising the following steps: setting a parameter calibration checkerboard on a marble platform for detection, and leveling the parameter calibration checkerboard; carrying out inertial navigation IMU static parameter calibration and inertial navigation IMU dynamic parameter calibration on the inertial navigation IMU, and correcting an inertial navigation IMU error; irradiating laser spots of a laser into the parameter calibration checkerboard, shooting the parameter calibration checkerboard from different angles through a machine vision camera, and obtaining a parameter calibration checkerboard photo set; and joint calibration of parameters of a machine vision camera, an inertial navigation IMU and a laser is carried out, and automatic correction of external parameters of various precise positioning measuring instruments and high-precision measurement of local space are realized.

The invention discloses a measuring instrument automatic calibration method and system based on big data, and the method comprises the steps: obtaining the multi-dimensional operation data of a measuring instrument in real time through a sensor, and covering the equipment state and environment parameters; processing the data to generate an operation data set, and extracting a fluctuation characteristic value of the quantitative state change by adopting time sequence analysis; when the fluctuation characteristic value exceeds a preset threshold value, triggering depth characteristic decomposition to obtain deviation distribution information; on the basis of the information and in combination with historical records, the optimal calibration opportunity is judged through a machine learning model; and a calibration instruction is automatically generated and issued to the instrument control module to execute calibration. According to the method, the defects that traditional calibration depends on manpower and is not accurate in time are overcome, intelligent and automatic calibration based on the real state is achieved, the calibration precision and efficiency are remarkably improved, and the adaptability and robustness of the system in the complex environment are enhanced.

The invention relates to the technical field of electric energy metering monitoring, in particular to an electric energy metering online monitoring method based on adaptive filtering and a deep convolutional neural network. According to the technical scheme, the method comprises the following steps: based on monitoring of correlation between electrical parameters and equipment characteristics, carrying out preliminary correlation analysis by using an intelligent algorithm according to electrical parameters, mutual inductor characteristics and electrical topological structure information collected by an electric energy metering device, and then carrying out global optimization algorithm processing. Noise interference in data is effectively removed through the adaptive filtering technology, the data quality is improved, a reliable data basis is provided for subsequent analysis and model training, the accuracy of a monitoring result is improved, high-precision description of errors of a measuring instrument is achieved, the precision of online monitoring of electric energy measurement is remarkably improved, and the method is suitable for popularization and application. Potential problems of the measuring instrument can be found in time, electric power transaction disputes and power grid operation risks caused by measuring errors are reduced, and stable operation and economic operation of an electric power system are guaranteed.

The invention provides a surface thermometer calibration system. The surface thermometer calibration system comprises a surface heat source device, a control host, a temperature control thermometer, a reference surface thermometer and a standard thermometer, the surface heat source device comprises a glass cover, a constant-temperature disc heat source, an upper protection structure, an adjustable support and a cooling fan. The control host comprises a dual-channel high-precision thermodetector, a dual-channel program-controlled output voltage-stabilized power supply and a control module, and the control module is used for obtaining measurement results of the temperature control thermometer, the reference surface thermometer and the standard thermometer and dynamically adjusting the output voltage of the dual-channel program-controlled output voltage-stabilized power supply according to the measurement results. Temperature control of the constant-temperature disc heat source is achieved. According to the surface thermometer calibration system designed and developed by the invention, the reliability and the calibration efficiency of surface thermometer calibration can be remarkably improved, and the reliability of surface temperature value traceability is ensured.

The invention discloses a construction method and device for controlling the perpendicularity of a high pier, and belongs to the technical field of bridge engineering construction. Determining a plumb aligner control point; mounting a creeping formwork bracket; installing a laser target; correcting and installing an inclination measuring instrument; centering the point position of the laser plumb aligner; measuring a deviation value between the laser beam and the pier body; collecting data of an inclination measuring instrument; and pier body concrete is poured. According to the method, through triple measurement rechecking and chemical deviation calculation, the perpendicularity control precision and efficiency of high pier construction are remarkably improved, and the method is suitable for high pier construction in a complex environment.

The invention discloses an online monitoring method for abnormal operation of a voltage transformer, and the method comprises the steps: firstly collecting the secondary side voltage data of a CVT in real time, forming a time sequence, building a bilateral sliding window with a to-be-measured point as a center, and sliding along a time axis to cover a complete sequence; then, K-Means clustering initialization is executed on each sliding window, the clustering number K is set to be equal to 2, two initial centroids are randomly selected, and the distance between each piece of voltage data and the two centroids is calculated; thirdly, dividing the voltage value in the window into the closest centroid category, and recalculating a new centroid until the position of the centroid is stable or reaches the maximum number of iterations; and finally, calculating a current window clustering centroid distance in real time, comparing the current window clustering centroid distance with a dynamic threshold value obtained by historical data training, and judging whether the CVT has an internal fault or not. The method utilizes the existing voltage data, does not need an additional measuring instrument, can adapt to different operation conditions, avoids the over-alarm problem of a traditional fixed threshold value method, and improves the accuracy and robustness of fault diagnosis.

The invention belongs to the technical field of flow instruments, and provides a dynamic compensation and error correction system of a high-precision flow instrument, which comprises a multi-dimensional data acquisition and preprocessing module, a module capable of being additionally provided with a sensor, a module for establishing a data stream with a timestamp and processing data, a module for fluid network modeling and priori knowledge construction, and a data processing module. A distributed collaborative optimization and parameter calibration module capable of constructing a directed graph model and generating initial compensation parameters; a network association reasoning and dynamic weight distribution module capable of adding a global penalty term to optimize parameters on the basis of a traditional error function; a working condition adaptation calibration and cross-domain parameter migration module capable of constructing an association graph, detecting abnormity and distributing weights; real-object-free calibration and parameter migration can be realized; according to the system, through multi-module cooperation, the problem that traditional single-table compensation is local and is not global is solved, and high precision and real-time performance of industrial-grade cooperative metering are supported.

The invention discloses a steel pipe diameter and out-of-roundness measuring method based on ellipse fitting. The method comprises the following steps: acquiring section contour data of a steel pipe; utilizing an improved ellipse fitting algorithm to obtain an optimal ellipse model and a corresponding local point; reconstructing steel pipe section contour measurement data through a linear interpolation algorithm; and the maximum diameter and the minimum diameter of the steel pipe are calculated by using the reconstructed steel pipe section contour measurement data, so that the out-of-roundness of the steel pipe is determined. On the basis of geometric distribution of data points and high efficiency of an improved ellipse fitting algorithm, steel pipe section contour measurement data can be accurately reconstructed; according to the improved ellipse fitting algorithm, the confocal hyperbolic distance is used for replacing the algebraic distance, the actual geometric distance from the steel pipe section contour data points to the fitting ellipse can be accurately reflected, the fitting ellipse better conforms to the actual section contour of the steel pipe, effective data points are obtained, and the fitting precision is improved. Noise points and outliers generated by a measuring instrument and the environment are eliminated, and the measuring precision is improved.

The utility model provides a difunctional angle measuring instrument, which relates to the technical field of angle measuring instruments, and comprises a first graduated scale, one side of the first graduated scale is fixedly connected with a circular shaft, the outer ring of the circular shaft is rotatably connected with a second graduated scale, one side of the second graduated scale is provided with a first sliding chute, and the second graduated scale is provided with a second sliding chute. A first sliding groove is formed in one side of the first graduated scale, a second sliding groove is formed in the other side of the second graduated scale, angle scale marks are arranged on one side of the second graduated scale, a pointer is fixedly connected to one side of the first graduated scale, and one end of the pointer penetrates through the first sliding groove and points to the angle scale marks. Therefore, the rotating angle of the arc-shaped rack driven by the rotating gear is small, so that the effect of accurately adjusting the second graduated scale is achieved, the situation that the force is too large or too small during operation can be avoided, the measurement accuracy is improved, the angle measuring instrument is convenient to use, and the use effect is improved.

The invention relates to the technical field of measuring devices, in particular to a glass thickness measuring instrument which comprises a workbench, the upper end of the workbench is fixedly connected with a first support, the upper end of the first support is provided with a first motor, and the lower end of the first support is provided with a first detection mechanism used for detecting an arc-shaped curved glass plate in a contact mode. A contact type laser micrometer is installed on the inner side of the first detection mechanism, a second detection mechanism used for non-contact type laser scanning detection of a glass plate is arranged on the inner side of the first detection mechanism, a plurality of sets of anti-reflection laser triangular sensors are arranged on the inner side of the second detection mechanism, and the anti-reflection laser triangular sensors are arranged on the inner side of the second detection mechanism for laser reflection interference caused by an arc-shaped curved surface. The anti-reflection laser triangular sensor is matched with the conical black velvet inner wall of the refraction plate and the 45-degree light barrier array to form an efficient optical trap, scattered light and transmission echoes are thoroughly absorbed, and the device is particularly suitable for high-precision measurement of high-power laser of 100 mW or above under an arc curved surface.

The utility model provides an on-line rotary viscometer, which belongs to the technical field of viscosity measuring instruments and comprises a measuring chamber, a rotor, a stator, a driving component and a detecting piece, and the measuring chamber is suitable for being communicated with a pipeline to be measured; the rotor is arranged in the measuring chamber, the rotor is of a cylinder structure with a cavity inside, and a plurality of liquid inlet grooves communicated with the cavity are formed in the side wall of the rotor; the stator is rotatably arranged in the cavity, and a medium channel is arranged between the stator and the rotor; the driving assembly is connected with the rotor, a medium flowing through the medium channel can rotate around the stator under the rotating action of the rotor, and the rotating medium can drive the stator to rotate or drive the stator to generate a rotating trend; the detection piece detects the viscous torque borne by the stator during rotation. According to the online rotary viscometer provided by the utility model, the rotation of the stator is driven by a medium without friction loss caused by a transmission process, so that the viscous torque during the rotation of the stator is accurately obtained, and the accuracy of a result is improved.

The invention relates to the technical field of measuring instruments, in particular to a wireless transmission digital pressure transmitter, which comprises a pressure transmitter, and is characterized in that the pressure transmitter comprises a reset magnet, an antenna, an LED indicating lamp, a right-angle antenna turning joint, a liquid crystal display screen, a toughened glass window, a hanging screw, an M6 bracket fixing hole, an instrument key and a process connecting interface; according to the scheme, by integrating multiple functional modules, temperature and pressure integrated measurement, flexible setting of multiple parameters and efficient processing and management of data are achieved; the pressure transmitter of the system supports the temperature and pressure integrated function, and different measurement requirements are met; instrument keys and upper computer software enable parameter setting to be simple and rapid; the data analysis unit of the upper computer performs deep mining on the data by using various algorithms, so that not only can pressure data be counted and analyzed, but also trends can be predicted, faults can be diagnosed, powerful support is provided for equipment maintenance and production scheduling, and the defects of a traditional system are effectively overcome.

The invention relates to the technical field of rubber cloth thickness measurement, and discloses a rubber cloth laser thickness gauge and method, and the rubber cloth laser thickness gauge comprises a supporting frame, the top of the supporting frame is provided with a conveying mechanism, one side of the conveying mechanism is provided with a transmission mechanism, the exterior of the transmission mechanism is provided with a cleaning mechanism, and the top of the supporting frame is provided with a detection mechanism. The cleaning mechanism is arranged on one side of the detecting mechanism, a collecting mechanism is arranged on one side of the supporting frame, a marking mechanism is arranged on one side of the collecting mechanism, the conveying mechanism comprises a first motor, the outer portion of the first motor is arranged on the top of the supporting frame, and the output end of the first motor is fixedly connected with a first driving gear. The rotating rod is in linkage with the belt wheel and the rotating disc structure, the protruding block is driven to periodically compress the piston assembly to form air pressure pulses, air flow is exhausted through the air outlet pipeline to sweep the surface of rubber cloth, and therefore the technical effect of synchronously cleaning the surface of the rubber cloth is achieved through the air pressure pulse purging structure.

The invention discloses an indoor toxic and harmful gas three-dimensional imaging and tracing method and equipment, and the method comprises the steps: placing remote measurement instruments based on a laser detection principle at different corners in a room, obtaining the remote measurement data of each space layer at different scanning angles, and positioning a gas concentration high-value region; dense point locations are arranged in a gas concentration high-value area of each spatial layer, an in-situ measurement instrument based on a spectrum detection principle is utilized to measure and obtain in-situ data on the point locations, and meanwhile, extremely-high-resolution poisonous and harmful gas accurate traceability is realized; the two-dimensional distribution of the gas concentration of each space layer is obtained through remote measurement and in-situ data reconstruction, and is further mapped to a three-dimensional space to realize three-dimensional imaging and gas traceability. A wide-area light beam scattering gas telemetering instrument and a multi-pass reflection ultra-sensitive gas in-situ measuring instrument are autonomously designed, so that full-space rapid three-dimensional imaging and accurate traceability can be realized, system errors are reduced, an extremely low detection limit is achieved, and the feasibility, accuracy and high efficiency of the method are ensured.

A value traceability method for an involute curve with a large base circle radius. The method comprises the following steps: step 1, determining a coordinate system for value traceability and value transfer parameters; step 2, adjusting the pose of an involute template (8); step 3, adjusting the position of the involute template (8); step 4, calibrating involute parameters; and step 5, eliminating coordinate system establishment errors to achieve calibration of a measurement instrument. The method fills the gap of value traceability methods for large-size gears with diameters greater than 500 mm, and can effectively identify the impact of coordinate system establishment errors on the accuracy of tooth profile measurement, and improve the applicability of a large-gear measurement instrument (9) in complex environments such as on-machine measurement. The method enables high-precision involute measurement, is simple and easy to implement, offers high measurement accuracy, facilitates transportation and installation adjustments, and has good market application prospects and promotion value.

A housing for a measuring instrument comprising a housing part, a cover connectable to the housing part in a detachable manner and by means of which a housing opening of the housing part is closable, and a sealing element. The housing part has a central axis, which coincides congruently with a central axis of the cover when closed. The cover has at least one sealing surface on which the sealing element comes to rest at least when the housing part is completely closed. The housing part has at least one sealing surface on which the sealing element rests when the housing part is closed with the cover. A surface line of the sealing surface of the housing part and / or a surface line of the sealing surface of the cover are / is rotated with respect to the central axis, at least when the housing part is completely closed.