19results about How to "Large measuring range" patented technology

This invention discloses a miniature flow sensor and an on-chip constant temperature difference control circuit for the flow sensor. The circuit includes a first resistor, a second resistor, an ambient resistor, an adjustable resistor, a micro-heater, an operational amplifier, a start-up resistor, and a start-up power supply. The ambient resistor and the micro-heater have the same temperature coefficient. One end of the first resistor is connected to one end of the second resistor and the output terminal of the operational amplifier. The other end of the first resistor is connected to one end of the start-up resistor, one end of the adjustable resistor, and the positive input terminal of the operational amplifier. The other end of the second resistor is connected to one end of the micro-heater and the negative input terminal of the operational amplifier. The other end of the start-up resistor is connected to the positive terminal of the start-up power supply. This constant temperature difference control circuit effectively maintains a constant overheating temperature of the micro-heater, thereby achieving a wide measurement range, low power consumption operation, and suppressing drift caused by ambient temperature, significantly improving the accuracy of the measurement results.

The application discloses a small shield machine pose detection device and method in curved pipe curtain construction, a one-dimensional workbench is initially at the highest point of a guide rail through the gravity of a heavy hammer, the guide rail is vertically installed on a jacking mechanism rack, and a long grating displacement sensor measures the vertical displacement coordinates of the one-dimensional workbench in real time. In the construction process, a cross joint measurement module passes through a pipe joint, a convex flange one end is connected with a concave flange at the tail of the shield machine, the concave flange one end is connected with a convex flange at the bottom of the one-dimensional workbench, two circular grating angle sensors and a circular grating reading head are arranged on the cross joint, the rotation angle measurement of two mutually perpendicular axes of the cross joint is realized, a Bluetooth wireless transmission module reads the rotation angles of each joint at the same time, and the rotation angles are transmitted to a computer, the computer collects each data every moment, the position coordinates of the top end of the shield machine relative to a reference coordinate system are obtained through calculation, and the pose of the shield machine is detected in real time.

The present application relates to the field of space in-orbit close-range relative visual navigation technology, and particularly relates to a space target visual measurement method combined with acceleration drift estimation, a tracking spacecraft is provided with an acceleration sensor and a camera, S1: obtaining initial relative position information and relative velocity information through a measurement system, S2: obtaining acceleration values and space target images in real time; S3: establishing a relative motion equation, substituting the obtained acceleration values and the relative position and relative velocity information at the previous moment into the relative motion equation to calculate position information; S4: calculating an error amount, and estimating the errors of the relative position information, the relative velocity information and the acceleration values in the dynamic equation through a filtering algorithm according to the error amount to correct the calculation results obtained in the dynamic equation, so that accurate positioning of a target spacecraft can be realized.

This utility model discloses a multifunctional measuring and recording ruler for wound undermining and sinus tracts. It includes a right-angle measuring ruler with connecting measuring rulers fixed at both ends, and a movable measuring ruler at the end of the connecting measuring ruler furthest from the right-angle measuring ruler. It also includes a movable sleeve connected to the top of the right-angle measuring ruler, with a colored pen inside the sleeve. This multifunctional measuring and recording ruler for wound undermining and sinus tracts allows for precise measurement of wound undermining and sinus tracts within the patient's wound using the right-angle measuring ruler, movable measuring ruler, and connecting measuring ruler. When wound depth needs to be measured, the ruler is held vertically, and one end of the movable measuring ruler is inserted into the wound to measure the depth. The depth is then marked with a colored pen according to the different depths of the wound, allowing for accurate and convenient recording of wound undermining and sinus tract size and depth, providing a basis for scientific wound assessment and treatment adjustments.

The invention relates to the technical field of concentration detection, and discloses a particulate matter concentration detection device and method.The device comprises a light beam output module, a detection shell, a first optical sensor, a second optical sensor, a first amplification sampling circuit, a second amplification sampling circuit and a control module; the included angle between the connecting line of the first optical sensor and the midpoint of the detection beam and the detection beam is equal to a first preset angle, and the included angle between the connecting line of the second optical sensor and the midpoint of the detection beam and the detection beam is equal to a second preset angle. The control module acquires a sampling value of the first scattered light energy signal and a sampling value of the second scattered light energy signal, calculates a first particulate matter concentration and a second particulate matter concentration according to the sampling values, compares the first particulate matter concentration with a preset threshold value, outputs the first particulate matter concentration if the first particulate matter concentration is greater than the preset threshold value, and outputs the second particulate matter concentration if the second particulate matter concentration is greater than the preset threshold value; otherwise, outputting the second particulate matter concentration. According to the invention, accurate detection in a full-concentration range is realized.

The utility model discloses an active back pressure piston type vacuum gauge, including at least one cylinder, a piston is movably arranged in the inside of cylinder and is spaced apart with the inner wall of cylinder predetermined distance, and the piston divides the inside of cylinder into vacuum cavity and back pressure cavity, is provided with pressure spring in back pressure cavity. Back pressure vacuum pump, and the suction port of back pressure vacuum pump communicates with back pressure cavity. The vacuum chamber of measurement, and the exhaust port of back pressure vacuum pump and the vacuum cavity of cylinder communicate with the vacuum chamber of measurement respectively. When working, back pressure vacuum pump continuously pumps out the air of back pressure cavity, and the piston moves under the pressure difference of vacuum cavity and back pressure cavity and compresses pressure spring. Under the effect of back pressure vacuum pump, the pressure ratio of back pressure cavity and vacuum cavity is lower than a certain value, and back pressure vacuum pump constantly pumps away the gas that leaks from the gap, and even if the air pressure of vacuum cavity changes, still actively keep the pressure ratio lower than a certain value, so that just need to measure the displacement of piston, and the air pressure value can be obtained.

The application discloses a dielectric constant measurement sensor based on an LTCC process and relates to the technical field of dielectric constant measurement.The application comprises an upper metal layer, an LTCC dielectric substrate layer and a ground metal plate layer which are sequentially stacked from top to bottom; two L-shaped coupling feed grooves are symmetrically etched in the upper metal layer, the L-shaped coupling feed grooves are electrically connected with an input port, and are used for introducing microwave signals of the input port and generating electromagnetic coupling with a lower H-shaped slot line structure through the LTCC dielectric substrate layer; a copper edge wall is arranged on three side edges of the LTCC dielectric substrate layer, and a metal via array is arranged on a signal port side of the LTCC dielectric substrate layer, and the copper edge wall and the metal via array jointly form an enclosed electromagnetic shielding boundary.The application generates a strong electric field concentration effect through the H-shaped slot line structure, directly contacts with a solid sample to be measured to realize dielectric constant measurement, has the advantages of high measurement precision, good sensitivity, easy integration and the like, and is suitable for the measurement of the relative dielectric constant of a solid substance.

This invention provides a method and apparatus for measuring the intensity distribution of high-energy laser light, relating to the field of laser intensity measurement technology. The apparatus includes: a beam sampling element, a sampling material, a sampling material control platform, a damage spot monitoring system, and a data processing terminal. The beam sampling element is used to sample a single beam of fixed diameter from the high-energy laser to be measured, obtaining the incident laser. The sampling material control platform, connected to the sampling material, is used to adjust the incident angle of the incident laser onto the surface of the sampling material and to adjust the position of the incident laser acting on the surface of the sampling material. The damage spot monitoring system is used to monitor the radius of the laser damage spot on the surface of the sampling material. The data processing terminal determines the intensity distribution of the high-energy laser to be measured based on the prior data of the damage threshold of the sampling material and the radius of the laser damage spot. This invention achieves direct measurement of the intensity and intensity distribution of high-energy laser light without using a beam attenuation element, providing intuitive results and simple operation.

The embodiment of the present application provides a kind of depth map splicing method, device, electronic equipment and computer readable storage medium, in the embodiment of the present application, by converting the depth map to be spliced into point cloud data, and by point cloud registration to the point cloud data of overlapping area, target rotation matrix and target translation matrix are obtained, according to target rotation matrix and target translation matrix, the pose of the depth map to be spliced is corrected, and the depth map to be spliced after having been corrected is spliced.In the present application, the overlapping area between the depth map to be spliced is converted into point cloud data for point cloud registration, so that the splicing error when splicing depth map is point cloud registration error, is not influenced by external motion mechanism error and pose estimation deviation, can significantly improve the accuracy and stability of depth map splicing, and can effectively expand the measurement range of 3D camera under the premise of ensuring data accuracy.

This utility model relates to a multi-range flow measurement device, including a main cavity, a rotating shaft, a damping adjustment module, a sealing assembly, a swing rod assembly, a swing arm assembly, a baffle, a base, and an angle sensor. The rotating shaft is disposed within and extends through the main cavity. One end of the rotating shaft is connected to the damping adjustment module, and the other end is connected to the angle sensor. One end of the swing rod assembly is sleeved on the rotating shaft and securely connected, while the other end of the swing rod assembly is connected to the swing arm assembly, which has a baffle. The main cavity is installed at the flow measurement position via the base. During measurement, the baffle is in direct contact with the fluid. One end of the sealing assembly is connected to the main cavity, and the other end is connected to the swing rod assembly or the swing arm assembly, isolating and sealing the baffle and the fluid outside the main cavity. This utility model enables flexible adjustment and wide-range measurement. The damping adjustment module can adjust the damping force according to actual working conditions, avoiding the measurement inaccuracy caused by the baffle reaching its maximum range at high flow rates.

The utility model discloses a machine cabin formula wind measuring laser radar belongs to wind driven generator component technical field. A machine cabin formula wind measuring laser radar, including wind measuring radar, tripod, wind measuring radar is located on the tripod, and the tripod is installed on the wind driven generator, wind measuring radar includes the emission head, be provided with the steering control mechanism between the tripod and wind measuring radar, the steering control mechanism includes support rod, rotary plate, roller, big gear, pinion, control motor, and support rod is located in the upside of the middle roof of tripod. The utility model provides a machine cabin formula wind measuring laser radar, and control motor can drive pinion to rotate, and pinion drives big gear to rotate through the tooth engagement, and big gear rotates and will drive rotary plate, support rod and wind measuring radar to rotate, make wind measuring radar can be oriented to other angle, like this can measure the wind speed at multiple angle, expand the range of measurement, and the wind speed data that the backstage receives and calculates is more accurate.

The utility model relates to the technical field of measuring tools, and discloses a drawing measuring scale for engineering cost, which comprises a main scale, an outer surface of which is movably connected with an auxiliary scale. And the locking mechanism is arranged at the top end of the auxiliary ruler. According to the drawing measuring ruler for the engineering cost, the straight ruler and the protractor are integrated, in the engineering cost drawing measuring and drawing work, the measuring ruler can be directly used for completing angle measurement and straight line drawing, workers do not need to frequently switch tools, the operation procedures are greatly reduced, and the working efficiency is remarkably improved; time waste and measurement errors caused by tool switching are avoided, the data basis of engineering cost calculation is accurately guaranteed, due to the design of the locking mechanism, it can be guaranteed that the auxiliary ruler stably stays at the required angle position during rotation, angle deviation caused by slight shaking is avoided, and the engineering cost is accurately calculated. The precision problem of a traditional measuring tool in the aspect of angle measurement is solved.

This application relates to the field of network measurement technology, and in particular to a method and apparatus for large-scale inference of the mapping between transnational submarine optical cables and autonomous systems. The method includes: acquiring the global router-level topology and the global transnational submarine optical cable topology; inputting the global router-level topology and the global transnational submarine optical cable topology into a trained classifier, outputting the mapping relationship between routers and transnational submarine optical cables; converting the router's IP address into an autonomous system number, and generating the mapping relationship between the transnational submarine optical cable and the autonomous system based on the autonomous system number and the mapping relationship between routers and transnational submarine optical cables. This solves the problems of excessively small measurement range and high detection overhead in related inference methods for mapping transnational submarine optical cables to autonomous systems.

The utility model discloses a stay wire type displacement meter fixed connection structure, which comprises a fixed support, an angle aluminum reinforcing member and a plurality of wind-resistant clamps, the fixed support comprises a first clamp and a second clamp, a first fastening bolt is connected between the first clamp and the second clamp, a horizontally arranged first fixed plate is formed at the top of the first clamp, and a second fixed plate is formed at the bottom of the second clamp. A fixing frame is arranged on the first fixing plate, and a stay wire type displacement meter is arranged in the fixing frame; the wind-resistant clamp comprises a third clamp body and a fourth clamp body, a second fastening bolt is connected between the third clamp body and the fourth clamp body, a second fixing plate is arranged at the top of the third clamp body, and a vertically-arranged limiting plate is arranged at the top of the second fixing plate. The stay wire type displacement meter fixed connection structure is simple in structure and convenient to install, and can ensure the stability and the measurement precision of the displacement meter in long-term operation.

The invention provides a stereoscopic vision sensor based on a single camera and double conical mirrors and a measurement method, and aims to solve the problems of small field of view, complex structure and difficult synchronization of a conventional stereoscopic vision system composed of multiple cameras. According to the sensor, light is reflected to the single industrial camera through two reflecting surfaces of the double-conical-surface mirror, an imaging model is established based on light tracing, and according to the binocular vision principle, space three-dimensional coordinates are calculated from image two-dimensional coordinates. The measurement method comprises the steps of camera and conical mirror parameter calibration, image acquisition, feature pairing and three-dimensional calculation. The method is suitable for the fields of industrial detection, robot navigation and automatic driving.

The application relates to the field of laser measuring instruments and discloses an engineering surveying laser range finder, which comprises a base, a laser range finder body and a support for bearing the laser range finder body, the base is provided with a driving assembly, a lifting assembly and a rotating assembly, the support is movably clamped with the rotating assembly, and the support is rotatably installed on the lifting assembly; the driving assembly synchronously drives the lifting assembly and the rotating assembly to move, the height and the angle of the laser range finder body can be double-regulated, the foundation pit can be measured at multiple angles and multiple points, the whole machine does not need to be manually moved, the measuring range is effectively expanded, and the foundation pit measuring requirements of different depths and different shapes can be met; the laser range finder body can be driven to reciprocatingly move along the length direction of the support through the stretching reset assembly, the horizontal measuring interval is further expanded on the basis of the rotation regulation, the measuring blind area is reduced, and the measuring data is more comprehensive and accurate.

This invention discloses a method and system for discriminating and compensating for rust particle scattering in a dual-path colorimetric assay within the same pool, belonging to the field of water quality optical detection and colorimetric analysis technology. The method includes: S1, before adding the colorimetric reagent, acquiring the transmission signal and scattering signal before the reaction under a long optical path, calculating scattering characteristic parameters, and determining the rust particle scattering interference level; S2, selecting a long or short optical path based on the scattering interference level and a preset transmission lower limit threshold, and using an electromagnetic shutter to select the chosen optical path; S3, after adding the colorimetric reagent, mixing and performing a colorimetric reaction for a preset time; S4, acquiring the transmission signal and scattering signal after the reaction under the same optical path, calculating the differential absorbance and scattering change; S5, obtaining the corrected absorbance through scattering compensation; S6, converting the corrected absorbance into the target analyte concentration based on the calibration relationship corresponding to the selected optical path and outputting the result. This invention can reduce measurement deviations caused by rust particle scattering and expand its applicability.

The utility model discloses a kind of rotary adjusting devices for interferometer measurement spherical surface lens surface shape error, be arranged in the measuring area of interferometer, including cylindrical jig, T jig, cylindrical jig upper end is along central axis direction, be equipped with the first groove and the second groove of cross, T jig upper end places lens to be measured, T jig lower part is adjustably fixed in the second groove by screw rod, so that T jig is suspended in the first groove, and T jig can rotate around screw rod central axis under the driving of screw rod. The device can be used with existing interferometer, by adjusting the angle and position of lens, effectively expand the measurement range of interferometer, realize the edge interference measurement of spherical surface lens surface shape, solve the problem that lens edge cannot be effectively measured due to the limitation of interference measurement range, and it is suitable for the measurement of spherical surface lens of multiple sizes and curvatures.

The utility model provides a measuring device and system. The measuring device comprises a holder and a stator assembly. The holder comprises a dust removal assembly which is used for carrying out dust removal on the laser radar under the control of a stator assembly; the laser radar is used for measuring the distance or the distance and the angle between the object to be measured and the laser radar under the control of the stator assembly, and sending the distance or the distance and the angle to the stator assembly; the rotor assembly is used for rotating around a first shaft under the control of the stator assembly and driving the dust removal assembly and the laser radar to rotate around the first shaft; wherein the first axis and the second axis are not on the same straight line, and the second axis is a rotating axis in the scanning measurement process of the laser radar; wherein the stator assembly is used for controlling the dedusting assembly to dedust the laser radar; controlling the laser radar to measure the distance between the to-be-measured object and the laser radar, or the distance and the angle; receiving the distance or the distance and the angle sent by the laser radar; and controlling the rotor assembly to rotate around the first shaft.