904results about How to "Eliminate measurement errors" patented technology

The invention discloses a three-dimensional human body gait quantitative analysis system and method. The method comprises the following steps of: simultaneously using two inertia measurement nodes on feet, carrying out analyses fusion on the data of the two inertia measurement nodes, measuring a more accurate gait parameter, and obtaining information which can not be measured in a single-foot manner; and firstly storing the collected data in storage units of the measurement nodes in a walking process, and finally transmitting the collected data to an analytical calculation device in a wired or wireless manner after the walking process is ended. The high-speed acquisition of all gait information in the walking process can be realized and no characteristic gait information point is omitted. A foot part binding device of the designed inertia measurement node is adopted, a measuring error brought by fixed position shift of the measurement nodes in the walking process is eliminated, and the identity of fixed positions of the measurement nodes in a walking process is guaranteed through repeated measurement; and a gait analytical calculation program module adopts a moving window searching value method to definition a characteristic point of gait information, and can more exactly extract the gait diagnostic information.

A simple-structured biosensor is provided for measuring a substrate in a sample rapidly and highly precisely, without significant influence of a peptide included in the sample. A biosensor for measuring the substrate contained in a sample solution includes one or a plurality of insulating base plate(s) 1; a pair of electrodes including a working electrode 2 and a counter electrode 3 provided on the base plate 1; and a reagent 11 for measurement including a redox enzyme and an electron mediator. The sample solution contains a peptide, and the working electrode 2 includes a metal, and at least a part of a surface of the working electrode 2 is covered with a film 10 of an organic compound containing at least one sulfur atom.

A time of flight camera system resolves the direct path component or the multi-path component of modulated radiation reflected from a target. The camera system includes a time of flight transmitter arranged to transmit modulated radiation at a target, and at least one pattern application structure operating between the transmitter and the target, the pattern application structure operating to apply at least one structured light pattern to the modulated transmitter radiation, and an image sensor configured to measure radiation reflected from a target. The time of flight camber is arranged to resolve from the measurements received the contribution of direct source reflection radiation reflected from the target.

The present invention relates to a biosensor which comprises an electrode system including at least one pair of electrodes, at least one insulating base plate for supporting the electrode system, a first reaction layer provided at least on a working electrode of the electrode system, including an organic compound having a functional group capable of bonding or being adsorbed to an electrode and a hydrophobic hydrocarbon group, a second reaction layer provided on the first reaction layer, including an amphiphilic lipid capable of bonding or being adsorbed to a hydrophobic portion of the first reaction layer, and a reagent system carried in a two-component membrane composed of the first and second reaction layers, including at least membrane-binding type pyrroquinoline quinone-dependent glucose dehydrogenase and an electron mediator.

The invention relates to a device and method for detecting the dynamic properties of a two-dimensional directional mirror. The device comprises a dynamic photoelectric autocollimator, a controller of the dynamic photoelectric autocollimator, a hollow rotary platform, a controller of the hollow rotary platform, a rotary target, an adjustment platform, a data acquiring and processing system and a computer measurement and control system. Under the guidance of the computer measurement and control system, a target simulation reflector on the rotary target is driven by the rotary platform to simulate an optical target in movement, the dynamic photoelectric autocollimator provides the rapid and high-precision angle miss distance for the two-dimensional directional mirror, the data acquiring and processing system feeds back and controls the two-dimensional directional mirror to track the target simulation movement in real time, and the computer measurement and control system processes the measurement data of the photoelectric autocollimator in real time to obtain the data reflecting the dynamic response properties of the two-dimensional directional mirror. The device and method provided by the invention can be used for detection of properties of the two-dimensional directional mirror, such as axis shaking, step response, dynamic continuous tracking and the like.

The invention provides a method and system for laser-IMU external parameter calibration. The method comprises steps of acquiring IMU measurement data and laser radar measurement data; carrying out IMUpre-integration of the obtained IMU measurement data, carrying out calculation to obtain an IMU pose transformation estimated value of the IMU relative to the IMU initial pose at the next moment, andaccording to the estimated value and an actual measurement value of the IMU at the next moment, obtaining an associated residual error associated with the data; processing measurement data of the laser radar, utilizing IMU pre-integration to obtain projection coordinates of reprojecting a plurality of laser radar points to a world coordinate system, and calculating a reprojection error from eachlaser radar point to a calibration target map; adopting a nonlinear least square method to iteratively optimize laser radar-IMU external parameter calibration so that the external parameter calibration result can be obtained. The method is advantaged in problems that in laser-IMU external parameter calibration, mechanical external parameters are not easy to obtain, manual measurement errors are large, and measurement is troublesome are solved, defects of the laser radar and the IMU are mutually overcome to a certain extent, and pose solving precision and the speed of the SLAM method can be improved.

An on-line quickly sampling and sample feeding device of multichannel gas consists of gas sampling unit formed by gas pipeline, multiple solenoid valves and a microdiaphragm vacuum pump; an fully-automatic six-way valve for feeding gas sample automatically; pipeline washing unit formed by a gas washing bottle and multiple solenoid valves; control unit formed by multiple switches being controlled manfully or being controlled automatically by computer .The property evaluating system of catalyst by utilizing said device is also disclosed .

The invention discloses a tetra-rotor aircraft attitude obtaining method by use of a three-order approximation Picard quaternion. The method comprises the following steps: (1), according to the three-order approximation Picard quaternion, performing attitude solution so as to prevent a gyroscope from integration accumulative errors and reduce differential amplification of noise; and (2), performing Kalman filtering on an attitude angle obtained through the solution so as to effectively filter sensor measuring errors caused by vibration of a tetra-rotor aircraft body and obtain a more accurate attitude angle. The attitude solution method provided by the invention can perform accurate attitude estimation on a miniaturized tetra-rotor aircraft.

A scanning probe microscope has an XY scanner for making a probe scan a sample surface, an approach and separate drive element for making the probe approach to the sample surface at a sampling position and separate the probe from the sample surface during movement between the sampling positions, and a servo controller for holding the distance between the probe and the sample surface at a reference distance during measurement at the sampling position. A plurality of scattered measurement locations are set away from each other as sampling positions. The approach and separation movements are performed at each sampling position. When measuring the surface by the probe at a sampling position and while making the probe move between sampling positions, servo control by the servo controller is continued. This makes it possible to quickly measure the surface by a simple controller and possible to measure a wide area or measure a high aspect ratio. When making the probe approach to the sample surface for measurement at the sampling position, it is also possible to cause a scan motion for tandem movement at an equal speed and in the same direction as the scan motion by the XY scanner.

Methods and devices for measuring elongation, wear, and internal temperature of a conveyor belt to catch signs of conveyor belt failure such as breakage by detecting a magnetic field from a magnetic body by using a magnesium sensor, as well as a rubber magnet sheet as a magnetic body and a method of producing the sheet, the rubber magnet sheet being able to be used while it is embedded in the conveyor belt. To measure elongation of a running conveyor belt ( 11 ), a magnetic field of a magnetic body ( 2 ) embedded in the belt ( 11 ) is detected by a magnetism sensor ( 3 ) fixed to the earth, and elongation of the belt ( 11 ) is calculated from temporal variation of the detected magnetic field.

The invention discloses an all-fiber current sensor consists of a 3x3 polarization-maintaining fiber coupler. One embodiment of the invention, a straight-through type interferometric all-fiber current sensor, comprises a light source, a 3x3 polarization-maintaining fiber coupler, fiber polarizers, a 1/4 fiber wave sheet and a transduction fiber ring. The light source is connected with one end of the 3x3 polarization-maintaining fiber coupler; the two ports of the 3x3 polarization-maintaining fiber coupler are respectively connected with two fiber polarizers; and the other ends of the two fiber polarizers are respectively connected with the transduction fiber ring by the 1/4 fiber wave sheet; one port of the 3x3 polarization-maintaining fiber coupler is vacant; and the rest two ports of the 3x3 polarization-maintaining fiber coupler are respectively connected with a signal processor by two photoelectric detectors. In addition, another embodiment of the invention, a reflection type interferometric all-fiber current sensor, also uses the 3x3 polarization-maintaining fiber coupler. The all-fiber current sensor avoids phase differences made artificially and makes the current transduction system woke more stably.

The invention discloses current transformer remanence measurement system and method. An upper computer receives current transformer data signals transmitted by a data unit. Related data processing is performed to calculate remanence coefficient. Operation states of an operating unit are automatically judged during measurement, and on and off of a relay are controlled. When the primary side of a current transformer is open, the secondary side is sequentially subjected to positive charging, discharging and revere charging until the current transformer is saturated. Flux variations in positive charging process, discharging process and revere charging process are obtained by calculation. The three flux variations are then calculated to obtain accurate remanence coefficient. Therefore, errors in remanence coefficient measurement caused when initial core flux of the current transformer is not zero are eliminated, accuracy in remanence coefficient measurement for the current transformer is increased, and fairness in electric energy measurement and trade settlement for the current transformer is guaranteed. The current transformer remanence measurement system and method have promising application prospect.

The invention discloses a rotary transformer initial position signal autocorrection method, which realizes stator vector orientation through software, calculates the average value after multiple positions and multiple angles are tested. The method of the invention not only reduces the cost, but also improves the rotary transformer initial position signal autocorrection accuracy.

The present invention relates to a CDSEM (scanning electron microscope) capable of evaluating and presenting the measurement repeatability as a tool with a high degree of accuracy without being influenced by fluctuations in micro-minute shape that tend to increase with the microminiaturization of semiconductor patterns, and to a method for evaluating accuracy of repeated measurement using the scanning electron microscope. There is provided a function whereby when measuring a plurality of times the same part to be measured, by making use of a micro-minute pattern shape such as the roughness included in the pattern, pattern matching with a roughness template image is performed to correct two-dimensional deviation in position of the part to be measured on an enlarged measurement image acquired, and then an enlarged measurement area image is extracted and acquired. This makes it possible to eliminate variation in measurements caused by the micro-minute pattern shape.

The invention is concerned with portable transfusion inspector, relating to a kind of inspecting, control and alarming equipment of transfusion liquid for hospital nurse. It affords a kind of portable transfusion process monitor and control equipment with chargeable battery and small bulk, small weight, low cost and easy operation and installation. Center microprocessor cell connects in parallel with infrared ray sending circuit unit, infrared ray incepting and adjusting circuit unit, drive and checking circuit unit for motor, power management circuit unit, chargeable battery, battery checking circuit unit, key-press circuit unit, indicator light circuit unit, sound circuit unit, compound joint and wireless communication circuit unit. The center microprocessor unit solidifies the monitor method of portable transfusion monitor and fits for the transfusion monitor field, such as hospital, community medical treatment and individual family with good market future.

The invention discloses a relative height measuring device which comprises a host computer, a microprocessor module, as well as an array type gas pressure sensor module, a power supply module, a liquid crystal display module and a serial port communication module which are respectively connected with the microprocessor module. A measuring method employing the relative height measuring device comprises the following steps: accomplishing a genetic algorithm optimized BP (Back Propagation) neural network in a host computer, transmitting obtained weights, thresholds and relative height calculation equations to the microprocessor module, acquiring gas pressure and temperature through the array type gas pressure sensor module and transmitting the gas pressure and temperature to the microprocessor module, processing the received air pressure and temperature through the microprocessor module so as to obtain the relative height, and transmitting the result to the liquid crystal display module to be displayed and stored in the host computer. With the combination of software and hardware, noise can be suppressed, useful signals can be recovered, enhanced and extracted, and the great precision and stability are achieved.

The invention belongs to the field of machine vision and particularly relates to a hot-rolled strip steel end three-dimensional contour measurement method based on double-line structured light. The method mainly adopts a double-line structured light method to carry out three-dimensional contour measurement of the shape of an end part of a strip steel which runs at a high speed of 120m/min on a hotrolling production line, and comprises operation steps of 1) establishing a system; 2) camera calibration; 3) light plane calibration; 4) solving three-dimensional space coordinates; 5) image acquisition and preprocessing; 6) processing a light bar image; 7) establishing the triangular relationship; and 8) performing three-dimensional reconstruction to obtain a three-dimensional point cloud chartof the strip steel. The method is advantaged in that the double-line structured light is projected to a plane of the end part of the strip steel, an intersection point of a line structured light andan edge of the strip steel is detected through image processing, a point is converted from a two-dimensional coordinate system to a three-dimensional coordinate system according to the structured light triangulation theory, the shape of the end part of the strip steel is obtained, and width of the strip steel is calculated.

The invention provides a power semiconductor device internal contact thermal resistance measurement method and measurement clamp. The measurement method comprises the steps that a relation curve of device electrical parameters and junction temperature is drawn; a transient thermal impedance curve when liquid metal is coated between the surface of a device shell and a heat radiator is drawn; numeric calculation is performed on the transient thermal impedance curve so that the integral structure function and the differential structure function of the device are obtained; and a contact thermal resistance value is solved through reference to the integral structure function and the differential structure function. The measurement clamp is composed of three substrates arranged in a horizontal direction and two columns arranged in a vertical direction. An insulated plate and a heat radiation substrate are longitudinally and symmetrically arranged between the upper substrate and the intermediate substrate. A pressure uniform distribution device, a sensor, a pressure maintaining plate and a pressure applying device are installed between the intermediate substrate and the lower substrate in turn. According to the measurement method, measurement error caused by a thermocouple can be eliminated, the measurement result is real and reliable and the measurement method is simple and efficient.

A testing apparatus, by which an optical system to irradiate a test light to a solid-state imaging device is easily aligned with the solid-state imaging device and highly efficient tests can be conducted, is provided.

It includes an optical module 35 for irradiating a light from a light source to a light receiving surface of the solid-state imaging device through a pin hole, a probe card 20 having contact probes for contacting pads of the solid-state imaging device, and a motor 30 and a holding arm 31 for moving the optical module 35 to a predetermined position corresponding to the solid-state imaging device to be tested through an opening 20h provided to the probe card 20 in a state where the contact probes 21 contact the pads of the solid-state imaging device to be tested.

The invention provides a coal mine grid system insulation state monitoring method and belongs to an electrical power system feed line insulation state monitoring method. A feed line branch circuit is selected for doing single-phase longitude metal grounding experiment, zero sequence voltage of a bus and zero sequence current of a non-malfunction branch circuit are tested, zero sequence impedance of the non-malfunction branch circuit is obtained, namely, insulation resistance and ground capacitance, for obtaining insulation parameters of all circuits, another branch circuit is reselected to do a single-phase connection low resistance ground experiment or the next circuit with the non-branch-circuit number 1 is waited for generating single-phase ground malfunction, the experiment is repeated, insulation parameters of a first experiment malfunction circuit are obtained, and the insulation parameters of all feed line branch circuits are obtained by synthesizing results of the two experiments. The coal mine grid system insulation state monitoring method has the advantages that insulation degradation degree of the circuits is analyzed from state change of the bus zero sequence voltage and an arc suppression coil, the zero sequence voltage changes to a certain extent, switching-in situations of damping resistance change, and the degradation degree of circuit insulation is forecasted by monitoring change of transient states of a plurality of feature quantities.

Disclosed is an on-line measurement method of battery pole plate thickness, which utilizes the thickness of a base band for automatic calibration, and the invention relates to a method for on-line measurement of battery pole plate thickness by adopting the laser differential detection. The method overcomes the defect of low measuring precision of the prior art due to the failure of on-line real-time automatic calibration. The method adopts the following steps that: a battery pole plate moves on a coated paper production line with constant speed; two laser displacement transducers arranged above the upper surface and under the lower surface of the battery pole plate respectively measure the distance value thereof relative to the battery pole plate; the program in a computer is controlled for calculating base band sampled data and SUMB of the two laser displacement transducers at the same time; the program in the computer is controlled for calculating hits in a coating area and SUMM of the two laser displacement transducers at the same time; and the program in the computer is controlled for calculating the thickness of the battery pole plate according to the formula of (SUMM-SUMB) xK+Db, wherein K is a constant; and Db is the base band thickness.

The invention discloses an array type air pressure measurement compensation device and method based on quantum particle swarm wavelet neural network. A micro-processing module is started to send instruction to a pressure sensor array and a temperature sensor, so that the air pressure and temperature are measured; measurement data is transmitted to the micro-processing module and a host computer respectively; the host computer establishes a wavelet neural network according to the received air pressure and temperature, and the wavelet neural network is optimized by utilizing the quantum particle swarm algorithm, the quantum particle swarm wavelet neural network is trained at the same time, and an obtained air pressure correction compensation formula is transmitted to the micro-processing module; the micro-processing module calculates the accurate air pressure value whose error is compensated; and the accurate air pressure value is transmitted to a display module and displayed. Retardation error of air pressure measured by arrays is compensated on the basis of the quantum particle swarm wavelet neural network, temperature drift and non-linearity are compensated, errors are reduced, effective signals are enhanced, air pressure measurement is more accurate, and requirements for meteorology measurement are met.