61results about How to "High measurement accuracy" patented technology

The invention discloses a micro-nano microwave power sensor based on a suspension low-dimensional thermoelectric material and a measuring method of the micro-nano microwave power sensor. An independent one-dimensional or two-dimensional high-quality thermoelectric material nano structure crosses two suspending temperature sensing substrates, and a microwave power-thermal-electricity conversion integrated system is established. When to-be-measured power is transmitted into one of the suspension substrates and the temperature of the suspension substrate is increased, the temperature difference is generated at the two ends of the thermoelectric material nano structure, the temperature difference forms thermoelectric potential, a thermal-electric conversion coefficient of the single thermoelectric material is the calibrated material intrinsic property, and thus the system can calculate the microwave power of the input end by measuring the thermoelectric potential. Temperature compensationcorrection does not need to be conducted on a reference end of the micro-nano microwave power sensor, the temperature of the reference end is measured by the system in real time, and the measuring error and the influence of the environment are lowered substantially; and a seebeck coefficient of the material can be increased through the low-dimensional structure, the thermal loss can be greatly lowered through the suspension substrates, and thus power testing precision can be effectively improved through the micro-nano microwave power sensor.

The invention discloses a multi-surface measurement method based on cavity length correction. The method can realize the pre-correction of a cavity length value and the accurate measurement of the surface of a measured piece, and comprises the main operation steps of a cavity length pre-correction process and a measurement process. The method sequentially comprises the following steps: placing a measured piece at a pre-estimated position A; acquiring an estimated interferogram; carrying out FFT calculation on multi-point average; inversely calculating the cavity length value, and correcting the cavity length position; performing guide rail and clamp correction; placing the measured piece at a measurement position B through the guide rail; acquiring an interferogram required by measurement; carrying out algorithm processing, and outputting the initial phase of each surface; carrying out inclination elimination and unwrapping; and calculating the surface shape of each surface. When the guide rail and the clamp are corrected and measured, the guide rail and clamp system needs to be used, and the system mainly comprises a clamp main body, a knob unit, three pressing head units and a guide rail unit. According to the method, the cavity length position of the measured piece is accurately measured, so that the purpose of accurate measurement is achieved by using a phase shift algorithm.

The invention discloses a method for measuring the sectional profile size of a turbine blade. The sectional profile size of a turbine blade is reversely deduced through radius compensation of the spherical head of a three-coordinate measuring instrument. The method includes the following steps: constructing a theoretical blade profile curve of a standard turbine blade at a predetermined profile height by using three-dimensional modeling; constructing a theoretical blade compensation profile curve after radius compensation of the theoretical blade profile curve; comparing and evaluating the theoretical blade profile curve and the theoretical blade compensation profile curve to obtain a theoretical error value; obtaining a measured blade profile curve of a turbine blade to be measured at thepredetermined profile height through three-coordinate measurement; and reversely deducing the actual sectional profile size of the turbine blade through the theoretical error value and radius compensation. The whole measurement process is simple, and the work efficiency and the measurement efficiency are high. The method is suitable for measuring the profile size of various types of precision casting turbine blades.

The invention belongs to the technical field of precision optical detection, and in particular relates to a digital holographic flexible measurement device and method based on fiber bundles. A Twyman-Green interference optical path is used to design a small probe. A Galileo telescopic structure expands a beam at a sample to improve the lateral measurement resolution. A tunable laser is used as a light source to realize interference phase shift by wavelength scanning. An interference signal is transmitted by a fiber bundle, and an image is converted by a convex lens into a CCD camera. The inverse diffraction process of optical waves is simulated in a computer, and the three-dimensional image of an original object surface is reconstructed by digital holography. The device of the invention iscompact and flexible, can realize full-area scanning measurement for large-sized workpieces, and can measure the inner surfaces of complex structures such as holes, cavities and slots. The digital holographic reconstruction can overcome the influence of light field diffraction, improves measurement resolution, avoids the precise focusing process of microscopic imaging, and improves the flexibility of real-time measurements.

The invention discloses a shaft-type workpiece measuring robot and measuring method. The shaft-type workpiece measuring robot comprises: a robot body comprising a base, mechanical arms that are fixedly mounted on both sides of the base and are symmetrical to each other, clamping jaws fixedly mounted at tail ends of wrists of the two mechanical arms, measuring components fixedly mounted on the outer sides of the wrists of the two mechanical arms, and a main control computer electrically connected with the robot body, the clamping jaws and the measuring components, wherein the clamping jaws areconcentric with the center shafts of the wrists of the mechanical arms and rotate around the center shafts of the wrists of the mechanical arms, the measuring components are concentric with the centershafts of the wrists of the mechanical arms and perform rectilinear motion along the axis direction of the center shafts of the wrists of the mechanical arms, and the displacement distances of the measuring components are greater than the lengths of the clamping jaws. The shaft-type workpiece measuring robot disclosed by the invention realizes the automatic positioning and measurement of shaft-type workpieces by using two groups of clamping jaws and measuring components, and improves the measurement accuracy of the crankshaft-shaped shaft-type workpieces by using the characteristic that the two mechanical arms of a dual-arm robot are in the same coordinate system.

The invention discloses a channel silt and flow measuring system. The channel silt and flow measuring system comprises a moving mechanism, a lifting mechanism and a sensor set; a fixing sleeve and a sliding sleeve are arranged on the two sides outside a shell in the moving mechanism, the fixing sleeve is fixedly connected with a steel cable, and the sliding sleeve is in sliding fit with the steelcable; a driving motor and a roller set in the lifting mechanism are arranged in the shell and are in connection transmission, one end of a lifting rope is wound on the roller set, and the other end of the lifting rope is connected with the sensor set; and a liquid level meter and an ultrasonic transducer in the sensor set are correspondingly arranged on a fish lead assembly, and the fish lead assembly is connected with the lifting rope. A measuring device is driven by the measuring device to perform transverse fixed-point displacement and transverse multi-point measurement without blockage; each sensor is always kept vertical to the water flow cross section under the action of lead fish and gravity, so that the sensors cannot deflect or be cheap due to the impact of water flow caused by inclination of a measuring machine, and the measuring precision is high and stable; and transparent ultrasonic waves are adopted as a flow velocity measurement mode, the precision is high, and the working efficiency is high.

The invention discloses a horizontal counterweight instrument for pole coordinate measurement, which comprises a flat plate, one end of the flat plate is fixed with a connecting plate, the connecting plate is perpendicular to the flat plate, a driving device is also fixed on the flat plate, and the connection between the driving device and the connecting plate is A guide rail fixed on the surface of the flat plate and a counterweight capable of sliding along the guide rail are provided, and the counterweight is connected to the driving end of the driving device; the surface of the flat plate is also provided with an electronic level and a single-chip microcomputer, and The signal receiving end is connected with the electronic level, and the signal output end is connected with the driving device; the limit switch facing the guide rail is arranged on the connecting plate, and the limit switch is also connected to the signal receiving end of the single-chip microcomputer; the upper part of the connecting plate A dust cover covering the panel is also fixed. The invention is used to solve the problem that the center of gravity of the pole coordinate measuring instrument in the prior art is continuously moved and affects the measurement accuracy, and realizes the purpose of automatically adjusting the center of gravity of the pole coordinate measuring instrument.

The invention relates to a transient electromagnetic three-dimensional multi-depth-point measurement system and a method thereof. The transient electromagnetic three-dimensional multi-depth-point measurement system comprises a high-power transmitting circuit, a transmitting coil, a vertical receiving coil array, a control circuit, a driving circuit, a filtering and amplifying circuit, a 32-path ADacquisition circuit, a 32-path synchronous data receiving upper computer, a voltage-stabilizing direct-current power supply, an acquisition circuit power supply system and a good conductor metal ball. The measurement method corresponding to the system can be achieved in two ways, namely, the measurement of the good conductor metal ball in the middle can be achieved by performing subtraction on measurement results under the condition with a good conductor metal ball and under the condition without a conductor metal ball and removing useless signals, or by fixing the good conductor metal ball and moving the transmitting coil and the vertical receiving coil array at the same time. The system can describe formation resistivity change information in different spaces, and can verify a Doll geometric factor and a non-coaxial geometric factor through experiments.

The invention discloses a high precision flatness detection device having reading convenience. The device comprises a support base provided with a reference surface, a reference member which is arranged on the support base and always keep a vertical state under gravity, and a plurality of supporting rods which are arranged on the support base and are used for supporting the bottom end of the support base so that the bottom end is located on the same plane. The reference member is provided with scales based on the reference surface as reference. After the device is placed on the ground, when the position of the reference member is stable, a reading process can be carried out without complicated operation so that use is convenient. Through observation of relative positions of the reference surface and scales, it is visually determined whether the ground forms an inclined angle with the horizontal plane and the inclined angle is acquired. The device has high measurement accuracy, is free of later calculation and improves the efficiency of the measurement.

The invention belongs to the field of prospecting and measurement, in particularly to a storage logging system. The storage logging system comprises a ground system and an underground instrument; a logging system is arranged in the underground instrument; the logging system comprises a storage, an azimuth signal acquiring module and a borehole diameter signal acquiring module which are all connected with a main control module; the azimuth signal acquiring module is connected with an azimuth sensor; the borehole diameter signal acquiring module is connected with a borehole diameter sensor; and a power supply respectively supplies power to the main control module, the storage, the azimuth signal acquiring module and the borehole diameter signal acquiring module by a power supply management module. The storage logging system breaks through the conventional thinking of transmitting logging data by a cable and solves the logging problem under the difficult conditions by adopting the storage instrument.

The invention relates to an efficient detection system and method of a hydraulic friction coefficient of a pressure-equalization mixing type pipeline. The efficient detection system comprises a water supply water tank, a detected pipeline composed of a plurality of sections of water pipes, an adjusting valve, an outlet stilling basin and a flow measurement weir, wherein each section of water pipeline is provided with two leveling brackets respectively; measurement sections are arranged nearby an inlet and an outlet of the detected pipeline respectively; at least two pressure measurement pipes are uniformly arranged at the periphery of the pipelines of the measurement sections; each pressure measurement pipe of one measurement section is connected with a pressure-equalization exhausting device. According to the efficient detection system and method, provided by the invention, the leveling bracket are adopted and the water pipe of each section can be rapidly leveled; the pressure-equalization exhausting device is adopted and the plurality of pressure measurement pipes are uniformly distributed on the detected sections; the pressure measurement pipes are used for rapidly exhausting air bubbles on each position of the detected sections and pressure on each measurement pipe on the measurement sections is reflected in the pressure-equalization exhausting device; the reflected pressure in the pressure-equalization exhausting device is naturally balanced together to form pressure value; complicated work of recording and calculating is greatly reduced and the measurement precision is improved.

The invention discloses an automatic registration method and device, and the method employs a trigger target and a sensor as triggers, and an image collection device is started according to a trigger signal sent by the sensor, thereby precisely controlling the image collection time; and correspondingly, the visual field range of the image collector is reduced into a single target registration target, angle errors of the target registration target are eliminated, so that the collected target registration target image has higher resolution, and a registration offset value can be calculated and updated on each printing plate periphery in combination with physical quantities such as relative stretching amount of a printing material. Overprinting parameters are adjusted in real time according to an overprinting deviation value, so that the printing precision of printed matters can be improved.

The invention provides a particulate matter concentration measuring system in a low-concentration particulate matter on-line tester, belongs to the technical field of particulate matter detection, and solves the technical problems to provide a particulate matter concentration measuring system with high measuring accuracy and small measuring error in the low-concentration particulate matter on-line tester. The adopted technical scheme is as follows: the particulate matter concentration measuring system in the low-concentration particulate matter on-line tester comprises a power circuit board, an analog circuit board and a digital circuit board, wherein the power circuit board is used for supplying power to the analog circuit board and the digital circuit board; the analog circuit board comprises a laser, a laser light-emitting circuit and a signal conditioning circuit, the digital circuit board comprises a master control circuit, a voltage-current conversion circuit and a communication circuit, and the laser light-emitting circuit, the signal conditioning circuit, the voltage-current conversion circuit and the communication circuit are respectively connected with the master control circuit; the particulate matter concentration measuring system in the low-concentration particulate matter on-line tester is suitable for the field of environmental monitoring.

The invention discloses a device for measuring a refractive index through an optical fiber interferometry. The device comprises a laser light source, a circulator, a sample reservoir, a photoelectric detector, a demodulation module and a collimator, wherein the collimator is arranged at one end of the sample reservoir; a 10%-reflecting 90%-transmission type lens is arranged in the collimator; a Faraday rotating mirror is arranged at the rear end of the sample reservoir; the light emitted from a laser passes through the collimator, and then becomes parallel light, emits into the sample reservoir and is reflected by the Faraday rotating mirror at the rear end; the Faraday rotating mirror can avoid the interference between the incident light and the reflected light in the sample reservoir; the two paths of light, namely, the reflecting light of the collimator and the reflecting light of the Faraday rotating mirror, have interference phenomenon. The device provided by the invention is high in measuring precision, is simple in structure, is easy to realize miniaturization, can be used for measuring various samples of gas and liquid, is wide in measuring scope of refractive index and can realize the digital automatic measurement.

The invention provides a weight measuring method and device based on broadband ultrasonic distance measurement. The weight measuring device comprises a bearing tray, springs, a transmitting ultrasonic transducer, a receiving ultrasonic transducer, an ultrasonic coupling liquid and a closed container, and is characterized in that the closed container is located below the bearing tray, the springs are vertically arranged at the lower end of the tray, the closed container is internally loaded with the ultrasonic coupling liquid, and the springs are soaked in the ultrasonic coupling liquid. The cargo weight is acquired through measuring the deformation amount of the springs by ultrasound. When the cargo is placed on the tray, the springs generate deformation, a data processing background sends a signal, the signal is converted into an ultrasonic signal through the transmitting ultrasonic transducer, the ultrasonic signal is transmitted and reflected back, and the cargo weight can be calculated through the data processing background according to the time delay of the sent signal and the received signal and the spring deformation amount acquired according to the original length of the springs. The weight measuring device has the advantages of compression resistance, waterproofness and long service life. Compared with a general electronic scale, the weight measuring device provided by the invention is more stable in reading and higher in precision.

The invention provides a liquid refractive index measurement system comprising a laser module, a spectroscope, a photoelectric detection module, a signal processing system, an acoustooptic frequency shift module, a sample pool, and a reflection module, wherein the laser module comprises a first laser and a second laser arranged at an interval; the spectroscope is used for dividing laser output from the first laser and the second laser into first reflected light, first transmission light, second reflected light and second transmission light; the photoelectric detection module is used for converting the first reflected light and the second reflected light into an electric signal; the signal processing system is used for processing the electric signal input by the photoelectric detection module; the acoustooptic frequency shift module is used for performing frequency shift on the first transmission light and the second transmission light; the sample pool comprises a bottom surface forming an included angle with the horizontal plane; and the reflection module is arranged on a light path of the second transmission light; the transmission direction of the second transmission light, reflected by the reflection module and refracted by liquid to be measured, is vertical to the bottom surface of the sample tool.

The present invention discloses a detection method of the surface shape of an optical aspheric surface. The method includes the following steps that: reverse compensation fringes irradiate on a tested aspheric surface from a projection direction; the reverse compensation fringes are subjected to the reflection imaging of the tested aspheric surface; an imaging system obtains modulation fringes carrying the surface shape information of the tested aspheric surface; the surface shape deviation of the aspheric surface is obtained according to the modulation fringes; and the processing condition of the tested aspheric surface is determined according to the surface shape deviation. The invention discloses a detection device of the surface shape of a rotation symmetric optical aspheric surface.