78results about How to "No measurement error" patented technology

The invention relates to the precision shaft angle measuring instrument precision detection filed, more particularly to an angle measurement precision detection apparatus of an encoder and a detection method thereof. The apparatus comprises a coupling assembly, a precision main shaft, a motor, a precision encoder, a connection base, a rotary table, a workbench, and a computer system. The precision encoder is employed as a reference and is connected with the precision main shaft coaxially. The precision main shaft is driven by the motor; and an output shaft of the precision main shaft is connected with a detected encoder. The computer controls the rotating speed and the position of the motor as well as simultaneously collects angle measurement data of the precision encoder and the detected encoder; and an error value representing deviation of the position output of the detected encoder from the position output of a reference precision encoder is obtained in rotation angles from 0 degree to 360 degrees of the precision main shaft. And processing is carried out by the computer to provide various measurement errors of the detected encoder and error frequency spectrums. According to the invention, beneficial effects are as follows: there are lots of measurement points and measurement can be carried out continuously, so that various errors of a detected encoder can be reflected; a frequency spectrum analysis on an error source can be carried out; automatic measurement is carried out, the measuring period is short and efficiency is high; and electronization of data processing is realized as well as detection data are filed.

The invention relates to a frequency change system group delay test method which comprises the following steps of: generating an FM (Frequency Modulation) carrier signal of which the carrier frequency is the center frequency of a working frequency band of a frequency change system by a signal source; then dividing the signal into two paths, wherein one path of signal is input to the frequency change system by an attenuator and used as the input of a first A/D (Analog-to-Digital) converter by the attenuator after being output by the frequency change system, the other path of signal is used as the input of a second A/D converter, and the two A/D converters synchronously sample data by using the same reference clock; then respectively carrying out Hilbert transformation, digital down conversion and non-coherent demodulation on two paths of A/D sampled data; and carrying out digital phase comparison on the two paths of demodulated base band signals to obtain a group delay value of the frequency change system. A group delay test result of all frequency points of the frequency change system in the frequency band can be obtained by changing the carrier frequency of the FM carrier signal in the working bandwidth of the frequency change system and repeating the processing; and the measuring precision depends on system heat noise, the correcting precision of a test cable and A/D sampling resolution.

The invention discloses a method for calibrating verticality of a magnetic shaft of a three-shaft magnetic sensor. A three-dimensional magnetic field generator and a nonmagnetic rotary table are adopted, the three-dimensional magnetic field generator and the nonmagnetic rotary table are arranged at first; the magnetic sensor which needs to be calibrated is fixed on the rotary table; a large magnetic field ranging from top to bottom is generated by the magnetic field generator, so that a numeric value measured by the sensor is not zero; the zero position of the rotary table is marked, the angle values of three shafts of the rotary table are recorded, and three shafts of the rotary table are rotated, so that the outputs of a shaft m and a shaft n of the sensor are zero and the angle values of the three shafts of the rotary table are recorded; the three shafts of the rotary table are rotated again, so that the outputs of a shaft m and a shaft n of the sensor are zero and the angle values of the three shafts of the rotary table are recorded; transformation relation between each shaft m, n and p of a coordinate O and each shaft x3y3z3 of the coordinate O3 can be obtained by calculating multiple recorded angle values so as to obtain a calibration result. The method is simple and feasible, high in accuracy and small in errors.

The invention provides a micro-nano level 3-D measurement '331' system and a measurement method thereof. The system is characterized in that X, Y and Z-axis standard-measure dimension lines or extended lines thereof of the 3-D measurement system are arranged to be perpendicular to one another and intersect at one intersection point, so as to establish a 3-D coordinate system taking the intersection point as a coordinate origin; an X-axis guide-rail guide plane and a Y-axis guide-rail guide plane of a measurement platform in the measurement platform are arranged to be coplanar with a measurement plane where a measuring-head central point is, so as to form a coincidence plane; the intersection point of the X, Y and Z-axis standard-measure dimension lines or the extended lines thereof is on the coincidence plane of the measurement platform; meanwhile, the X and Y-axis standard-measure dimension lines or the extended lines thereof are also arranged to coincide with three planes, so as to ensure that X and Y coordinate planes of the established coordinate system coincide with the measurement plane; and the measuring-head central point is arranged to coincide with the intersection point of the three standard-measure dimension lines or the extended lines thereof. The invention satisfies the Abbe principle in 3-D direction, thereby effectively avoiding Abbe errors and guaranteeing high measurement precision.

The present invention discloses a general chain length extension detection device. The device comprises a workbench, a pulley block arranged on the workbench, a pulling assembly and a measurement assembly. The pulley block is arranged at one side face of the workbench, the measurement assembly is arranged on the surface of the workbench and in the same horizontal line as the pulley block, and the pulling assembly is arranged on the surface of the workbench and is in parallel with the measurement assembly. The general chain length extension detection device replaces a traditional manual detection mode, is able to detect multiple chains and has universality; and moreover, a grating ruler is taken as a measurement instrument, so that the measurement error is greatly reduced, the operation is simple and only one person is able to operate.

The invention comprises a dynamic compaction machine construction and operation parameter acquiring system and an operating method thereof. The dynamic compaction machine construction and operation parameter acquiring system is characterized in that: a programmable logic controller PLC is connected with a signal receiving device, an optical encoder, a tension sensor, a buzzer and a display, and the signal receiving device communicates with a signal transmitting device; the optical encoder is connected with a pulley above a pounder hammer hook, and the tension sensor is connected with a steel wire rope; and the signal transmitting device is arranged outside a dynamic compaction influence range and is leveled, and is aligned with a dynamic compaction machine. The dynamic compaction machine construction and operation parameter acquiring system and the operating method thereof have the beneficial effects that precise acquisition and dynamic real-time display of tamping settlement, accumulated tamping settlement, pounder hammer weight, falling distance and tamping energy data can be realized, the detection result cannot generate measurement errors due to the influence of factors such as sagging of the dynamic compaction machine.

The invention discloses an air tightness detecting device and a servo control method thereof. The air tightness detecting device comprises a first gas source, a first pressure sensor and a first proportional servo valve. The first gas source and the containing cavity of a first object to be detected are connected by a first proportional servo valve. The first pressure sensor is connected to the containing cavity of the first object to be detected and is used for detecting the pressure in the containing cavity of the first object to be detected so as to judge the air tightness of the containing cavity of the first object to be detected. The first pressure sensor is also connected to the first proportional servo valve and is used for adjusting the state of the first proportional servo valve. Through improving control loop design and a server control process, the problems of the low accuracy of a direct pressure testing method and the inconvenient operation of a differential pressure test method are solved effectively, according to the device and the corresponding servo control method, the opening of an electro-pneumatic proportional servo valve is controlled through a closed-loop system to control the flow of gas in the loop, and the air tightness of the system can be detected.

The invention belongs to the technical field of analysis and detection, and particularly relates to a Freon gas detection warning device. The invention discloses the Freon gas detection warning device which comprises a detection and analysis system, a gas path system, a control system and a power supply system, wherein the detection and analysis system, the gas path system and the control system are connected with one another, and the power supply system is used for supplying power to the detection and analysis system, the gas path system and the control system. The Freon gas detection warning device disclosed by the invention has the characteristics of good separation effect, accuracy in measurement, high interference resistance, good repeatability and the like, and can be used for qualitative analysis as well as quantitative analysis of F1301, F-11, F-12 and F22; the adopted technical principle is advanced; the Freon gas detection warning device is reasonable in design, convenient to use and maintain, and high in standardization level and universalization level.

The invention discloses a method for acquiring a wind speed value of a wind driven generator. A mathematical model used for solving the wind speed is built by means of parameters, corresponding to the wind speed, of the wind driven generator, and then the wind speed value is calculated through the model. The method has the advantages that wind speed sampling points are accurate, the acquired wind speed value is real and reliable, high in precision and free of measuring errors, and a wind speed measurement device does not need to be used.

The invention relates to an inclinometer measuring instrument which is not equipped with a pendulum and a circular dial on the main body of the inclinometer, is not easy to produce measurement errors, and can measure the inclination of a measured object in a short time. It has a main body frame (1) configured along the measured surface H and a reference arm (2) and a telescopic arm (3) that are in contact with the above-mentioned measured surface H. The reference arm (2) and the telescopic arm (3) are vertically aligned It is arranged at both ends of the main body frame (1) in the same direction, and the telescopic arm (3) is equipped with a slide rule that moves with the expansion and contraction of the telescopic arm (3) and a bubble gauge for observing the levelness of the telescopic arm. If the front ends of the reference arm (2) and the telescopic arm (3) are docked to the surface H to be measured and the telescopic arm (3) is stretched, and the level of the telescopic arm (3) is adjusted according to the bubble gauge of the telescopic arm, then the Measure the inclination of the measured surface H.

The invention discloses a full-automatic standing wave resonance method sound velocimeter based on WIFI. The full-automatic standing wave resonance method sound velocimeter based on WIFI comprises a slidable grid-capacitance type ruler head, a grid-capacitance type ruler body, master control equipment, a carrying rack in the middle of the sound velocimeter, a receiving end transducer, a carrying seat for fixing the receiving end transducer, an emitting end transducer, a straight rack fixed to the carrying rack, a gear at the bottom of the transducer carrying seat, a power supply, an instrumentside rack, a spring electric wire, a receiving end transducer signal line, a grid-capacitance type ruler signal line, a connecting rod of the carrying seat and the grid-capacitance type ruler head and an ultrasonic signal emitter. By means of wireless control, complex connection of the electric wire is avoided, the instrument is placed conveniently, and the sound velocimeter can be used for teaching demonstration. Meanwhile, by adopting a wireless scheme of WIFI, measured data can be shared in LAN, so that the teaching means is enriched.

The invention discloses a measuring method and tool for the electrolyte level or aluminum level in an aluminum electrolysis cell. When the electrolyte level or aluminum level in the aluminum electrolysis cell is measured, a measuring nager is manufactured into an L-type measuring nager formed by a vertical iron rod and a horizontal iron rod, the horizontal iron rod of the L-type measuring nager is placed on a horizontal supporting base, the vertical iron rod of the L-type measuring nager is vertically inserted into electrolyte or molten aluminum in the aluminum electrolysis cell, at the moment, a mark of the electrolyte or molten aluminum will be formed on the vertical iron rod of the L-type measuring nager, then the L-type measuring nager is taken down from the horizontal supporting base and placed on a measuring trolley, the vertical iron rod of the L-type measuring nager is attached to a vertical supporting rod, which is perpendicular to a horizontal support and provided with a graduated scale, of the measuring trolley, in this way, the value corresponding to the mark on the vertical iron rod can be directly read from the graduated scale of the vertical supporting rod, and the value is a measurement value. The measuring method and tool have the advantages of being high in measurement precision and efficiency, small in measuring workload, simple in structure, convenient to operate and use and the like.

The invention provides an ultrasonic gas meter measurement data adjustment method, which belongs to the measurement field. The method comprises steps: the temperature value of the environment in whichthe ultrasonic gas meter is located currently is acquired, and the theoretical flight time under the current temperature value is determined; the flight time of ultrasonic signals in a runner is acquired; in combination of the theoretical flight time and a preset flight time threshold, whether an error wave anomaly exists in the ultrasonic gas meter is judged; and if an error wave anomaly exists,automatic gain adjustment is carried out on the ultrasonic gas meter, and based on the adjusted ultrasonic gas meter, gas quantity measurement is carried out. During the process of using the ultrasonic gas meter to measure the gas consumption, a technical characteristic of acquiring a sound standard transmission speed under the temperature value based on the temperature value is introduced, whether an error wave phenomenon exists currently is judged according to the determined sound standard transmission speed, and the defect of possible measurement errors caused by ultrasonic flow measurement can be effectively remedied.

The invention relates to the technical field of electric energy metering, and discloses a detection circuit and an electric energy metering chip and device based on the detection circuit and equipment. The circuit comprises a reference current source, a sampling circuit, an adaptive filtering module, a signal processing module, a disconnection working condition detection circuit and protection measures adopted for the working condition. The adaptive filtering module is adopted, the metering error caused by the change of the frequency of the reference current source or the interference in the sampling signal is greatly reduced and the detection precision of the detection circuit is improved; meanwhile, the detection circuit is designed for various wire disconnection working conditions in the detection circuit, disconnect protection measures are correspondingly designed, and the reliability and the safety of operation of the metering system are improved.

The invention discloses a spherical end face shape and position degree detector, which comprises a mandrel, a template, screws and pins, wherein the template is a sheet component and is provided with a knife-edge arc detection surface; the mandrel is provided with a radial opening slot for installing the template, and the depth of the slot is equal to the radius of the mandrel; the flat surface of the template and the bottom surface of the opening slot of the mandrel are attached and are fixedly connected by the screws and the pins, and a vertical center line of the arc of the template is coaxial with an axial line of the mandrel; the radius of curvature of the arc is equal to the radius of the spherical end face to be detected; and the mandrel is in clearance fit with a shaft hole to be detected. The spherical end face shape and position degree detector uses the mandrel as a standard to detect the shape and the position of the spherical end face, has convenient measurement and high detection efficiency, and is particularly suitable to be used as a special on-line detector in large-scale production fields.

The invention provides a precise AC/DC broadband voltage dividing device and method. The device comprises a resistance voltage dividing module and a buffer module. The resistance voltage division module comprises a high-end resistor and a low-end resistor; the buffer power supply module comprises a buffer; the high-end resistor is configured to receive an input voltage and perform voltage divisionthrough the resistor, and a signal after voltage division is output to the front end of the buffer from the low-end resistor; the high-end resistor and the low-end resistor are connected in parallelwith a compensation capacitor to correct the frequency response curve of the voltage divider; and the buffer converts the high-internal-resistance signal into a low-resistance output signal to carry out broadband precision measurement.

The invention provides a magnetic quantitative tipping bucket metering device, which comprises a container shell, a medium inlet in the upper part of the container shell and a medium outlet in the lower part of the container shell, wherein the medium inlet is communicated with a gas-liquid separation device in the container shell, at least three metering buckets and a magnetic quantitative deviceare arranged in the middle of the container shell, and the three metering buckets can continuously rotate around a central rotation axis and are arranged at equal intervals; the magnetic quantitativedevice comprises a magnet A, a magnet B and a position adjusting mechanism, the magnet A is arranged at an edge, close to an inner wall of the container shell, of the metering bucket, the magnet B isarranged on a corresponding outer wall of the container shell, the magnet A and the magnet B can generate interaction force, and the position adjusting mechanism can adjust the magnitude of the actionforce; a counting sensor is arranged on the outer wall of the container shell. The magnetic quantitative tipping bucket metering device disclosed by the invention has the advantages of simple structure, accurate precision, safety, reliability and no mechanical shock.

The invention belongs to the motor torque measuring technology and more particularly, to a permanent magnetic motor gullet torque measuring method, characterized by: a tested motor is in tangent contact with the guide rail plane through a circular housing and under the assistance of a baffle plate, positions at the position of the guide rail; when the guide rail moves, the tested motor rolls and through a precise moving platform, the moving length of the tested motor is determined; the motor shaft at the geometrical center of the circular housing ensures that the initial angle is possible at any measuring point through a horizontal balanced rod. The balanced rod is ensured to be at a horizontal state at any measuring point through the horizontal ruler, the counterweight, the screw rod support rod and the electronic scale. According to the lever balance principle and through the torque equilibrium equation, it is possible to accurately work out the gullet torque at any measuring point. Through the gradual movement and the measurement along the guide rail, the discrete waveform for the motor gullet torque could be obtained.

The present invention discloses a quality measurement device and method. The device comprises a conveyor belt, a laser range finding module, a speed measurement module and an embedded analysis module. The speed measurement module is configured to measure the travel speed of the conveyor belt; the laser range finding module comprises a plurality of laser range finding sensors being in linear arrangement at intervals, the laser range finding sensors perform range finding along the direction perpendicular to a conveying surface, and are distributed along the direction being perpendicular to the travel speed of the conveyor belt; and the laser range finding module is connected with the embedded analysis module through a collection card, and the speed measurement module is connected with the embedded analysis module. The quality measurement device and method are fast in measurement reaction speed, cannot not cause measurement error because of cheap material stack positions and more accord with the usage requirement in the actual production.