103results about How to "Solve the large measurement error" patented technology

A pressure sensor for an extracorporeal circulating circuit includes a liquid chamber, a pressure measuring means, and a liquid flow path. The liquid chamber includes a reference surface not deformed by a pressure in the extracorporeal circulating circuit, a deforming surface disposed separated from the reference surface and deformed at least partially by a pressure in the extracorporeal circulating circuit, a first connection surface that joins the deforming surface with the reference surface to form a closed liquid-tight space inside them and is not deformed by a pressure in the extracorporeal circulating circuit, a liquid inflowing port provided in the side surface of the first connection surface, and a liquid outflowing port disposed away by ½ to less than one round from the inflowing port in the flowing direction of liquid introduced along the inner periphery of the side surface of the first connection surface. The pressure measuring means measures the deformation amount of the deforming surface, and is disposed outside the liquid chamber; and the liquid flow path is liquid-tightly connected with the liquid inflowing port so that liquid to be introduced into the liquid chamber flows in along the inner periphery of the side surface of the first connection surface.

The present invention is method of determining water content in crude oil. The method includes cooling crude oil in a refrigerator and inclining and stirring to separate out free water from crude oil, weighing the free water in a electronic balance, determining the weight of emulsified water and suspend water in centrifugal process or distilling process, calculating the total water weight, and calculating the weight percentage of water in crude oil. The perfected method has raised determining precision.

Each of three magnetic sensors is positioned on a first virtual line that passes the centers of two magnetic shields in the width direction and is perpendicular to a virtual plane, so a value detected by the magnetic sensor is less likely to be influenced by an external magnetic field. The first virtual line and the center of a conductor intersecting the first virtual line are separated from each other by a certain distance. Therefore, even if a distance from the center of the conductor in the width direction to the magnetic sensor is short, it is possible to improve, on a high-frequency side, frequency characteristics in the detection sensitivity of the magnetic sensor for the frequency of the current under measurement.

An improved measurement circuit includes a current transformer and an active feedback circuit operated as a negative resistance that matches the value of the winding resistance of the current transformer. An amplifier in the feedback circuit provides power to drive a secondary current through a sense resistor and the transformer winding resistance, reducing the most significant error source in a current transformer circuit by presenting a negative impedance to the current transformer. Combined with the positive resistance of the transformer's winding, the negative impedance results in a net burden of zero on the current transformer, which eliminates the need for the transformer having to provide power to drive the secondary current. This facilitates the use of smaller transformers while achieving reduced measurement errors. Thus, a single, compact measurement device may be used in a wide range of applications with high measurement performance.

The invention relates to an automatic tension control system and a method thereof, relating to a system and a method for applying pre-stress on a pre-stressed component in civil engineering. The system comprises an electric oil pump, a hydraulic jack, a controller of the automatic tension control system, a data relay controller and a computer. A pull rod type displacement sensor and a pressure sensor are arranged on the hydraulic jack. Control valve rods of left and right control valves of the electric oil pump are connected with a stepping motor. The controller of the automatic tension control system comprises a MCU (Micro-programmed Control Unit) single chip microcomputer, functional keystrokes, a displacement collection unit, a pressure collection unit, a buzzing and alarming unit, a display unit, a driving module, a motor steering output unit, a motor steering and stopping output unit and a motor pulse output unit. The method comprises the steps of tensioning, unloading and the like. According to the system and the method disclosed by the invention, the tension precision can be increased; the tension uncontrolled accident of the pre-stressed reinforcing steel can be effectively avoided; the system and the method have the characteristics of being simple in structure, low in cost, safe, reliable, low in quality monitoring difficulty, simple in method and convenient for operation; and the system and the method are applied to various fields.

The invention discloses a method for smoothing the pseudo range by using a Doppler frequency shift, comprising the following steps: calculating the pseudo range of a measured epoch by using the code phase measurement value; calculating the change rate of the pseudo range of the measured epoch by using the Doppler frequency shift; calculating the estimation value of the pseudo range of the current epoch by using the smoothed value of the last epoch and the change rate of the pseudo range of the current measured epoch; and endowing the measurement value and the estimation value of the pseudo range of the current epoch with different weight to obtain the smoothed value of the pseudo range of the current epoch. Because the error on the pseudo range measured by using the code phase in single time is great, the Doppler frequency shift is used for smoothing the pseudo range. Therefore, the error on the pseudo range can be reduced effectively, and further the positioning accuracy of the GPS can be improved.

The embodiment of the invention discloses a pin load measurement method and device, a measuring instrument and a storage medium. The method includes the following steps: under two circumstances of notapplying a load to a composite material connecting piece and applying a specific load, obtaining three-dimensional position coordinates of each projection line, on a first surface of a connecting plate, of a cross section tangent with side walls of each pair of connecting holes in the connecting piece to obtain initial position parameters and extrusion position parameters; according to the difference values of extrusion position parameters and the initial position parameters of the projection lines corresponding to each pair of connecting holes and the sum of the difference values of the extrusion position parameters and the initial position parameters of the projection lines corresponding to all the connecting holes, determining a deformation ratio of each pair of connecting holes; and according to the deformation ratio and the applied load, obtaining a pin load value of each pair of connecting holes. By adoption of the abovementioned technical scheme, a noncontact mode is adopted todirect measure pin load distribution in the composite material connecting piece, a measuring error is reduced, cost of pin load measurement is reduced, and thus wide-range use is facilitated.

A method for determining parameters of a wireless power transmission system is disclosed where the wireless power transmission system transmits power from a power transmission device to a power reception device via electric field coupling. The parameters include a coupling coefficient ke of an electric field coupling unit that is formed of active electrodes and passive electrodes of the power transmission device and the power reception device.

The invention relates to a measuring device for a sealing ring of a three-eccentric center butterfly valve. The device is characterized by comprising a fixture body arranged on a vertical lathe, wherein the rotation center of the fixture body is overlapped with the rotation center of the vertical lathe; a positioning body is obliquely arranged on the fixture body; a workpiece is clamped on the positioning body; a measuring rod frame is arranged in the rotation center of the fixture body; a measuring rod is horizontally arranged on the top of the measuring rod frame; the rotation center of the fixture body equally divides an included angle formed between the two sides of the axial section of the machined workpiece; an included angle is formed between the rotation center of the vertical lathe and the vertical center line of the workpiece and is equal to an included angle formed between the rotation center of the vertical lathe and the center line of a butterfly valve installation pipeline; one end of the measuring rod stretches out of the measuring rod frame; and the end part of the stretching end of the measuring rod is provided with a tool setting point of a turning tool of the vertical lathe. The device solves the problem that the measuring error of the sealing ring is large, ensures the actually measured size of the sealing ring, simply and accurately measures the sealing ring, and well ensures a sealing effect.

The invention relates to the field of cigarette detection device and in particular relates to a cigarette smoldering detector. The cigarette smoldering detector comprises a smoldering rack for mounting cigarettes. A cigarette mounting position is arranged on the cigarette rack. The cigarette smoldering detector also comprises a photoelectric detection device for detecting whether the cigarette mounting length in the cigarette mounting position meets the requirement or not. The photoelectric detection device comprises an emitter which emits a detection signal. The cigarette smoldering detector provided by the invention detects whether cigarette mounting length is qualified or not through the photoelectric detection device and solves the problem that the measuring error of the existing cigarette smoldering detection device which mainly performs manual detection is great.

The invention discloses a farmland runoff monitoring device simultaneously suitable for dry land and paddy fields. The device comprises a water inlet, a grit chamber, a steady flow plate, a triangularweir, a float-type water level sensor and a water outlet. A movable sampling frame is arranged in the grit chamber; farmland drainage settles silt through the grit chamber and stably enters a triangular weir for flow measurement through a steady flow plate; the float-type water level sensor is communicated through a hole in the right side of the weir trough, the float in the instrument rises andfalls along with the fluctuation of the water level, the water level change in the triangular weir is measured, and water level data is transmitted to automatic sampling equipment to calculate the weir flow; when the water level exceeds the height of the weir crest of the triangular weir, sampling is triggered so as to compare changes of runoff pollutant concentrations generated in different stages. By utilizing the agricultural non-point source pollution runoff monitoring device, the problems of small agricultural non-point source pollution runoff flow, much silt and difficulty in accurate measurement can be solved, and a reliable basis is provided for agricultural non-point source pollution control and ecological environment protection.

The invention discloses a device and method for measuring the rocket fuel liquid oxygen liquid level through laser ranging. The device comprises a control module which is used for transmitting a lasertriggering signal through a data communication module, and updating the liquid level information in real time according to the liquid level height; a laser sensing probe which is used for emitting measurement laser, and transmitting the reflected laser to a data acquisition and processing module; a reflection floating plate which is used for reflecting the measurement laser and outputting the reflected laser; a data acquisition and processing module which is used for recording initial data information and analyzing the reflected laser to obtain measurement data information; and a data communication module which is used for calculating the liquid level height according to the initial data information and the measurement data information. The problems that a traditional rocket low-temperature fuel liquid oxygen liquid level monitoring scheme is affected by low temperature, capacitance dielectric constant, in-tank pressure intensity, electromagnetic wave interference and the like, so that measurement precision is low, the range is small, reliability is poor, the safety coefficient is low, and installation is complex are solved.

The invention provides a method, a device and a system for measuring the angle of an acetabular cup prosthesis. The method comprises the following steps: acquiring CT data of a pelvis after a hip replacement operation; performing three-dimensional reconstruction on the CT data to obtain a three-dimensional model of the pelvis and a three-dimensional model of the acetabular cup prosthesis; and according to the three-dimensional model of the pelvis and the three-dimensional model of the acetabular cup prosthesis, measuring the front rake angle and the abduction angle of the acetabular cup prosthesis. According to the method, three-dimensional reconstruction is carried out through CT data to obtain a three-dimensional model of a pelvis and a three-dimensional model of an acetabular cup prosthesis, and therefore the front rake angle and the abduction angle of the acetabular cup prosthesis are measured according to the three-dimensional model of the pelvis and the three-dimensional model of the acetabular cup prosthesis. Compared with the prior art that the anteversion angle and abduction angle of the acetabular cup prosthesis are measured through a two-dimensional X-ray film, errors are greatly reduced, and the problem that in the prior art, an acetabular cup angle measuring method is large in measuring error is solved.

The invention discloses a precise steel pipe rapid diameter measuring device for auto spare parts, and relates to the technical field of auto spare parts. The precise steel pipe rapid diameter measuring device for the auto spare parts comprises a bottom plate, rolling wheels are rotationally installed on the outer surface of the bottom of the bottom plate, a first side rack and a second side rackare welded to the outer surface of the top of the bottom plate, and second sliding grooves are formed in the first side rack and the second side rack correspondingly; and second sliding blocks are slidably mounted in the second sliding grooves, the number of the second sliding blocks is two, connecting blocks are welded to the adjacent side walls of the two second sliding blocks, and a U-shaped box is arranged between the first side rack and the second side rack. According to the precise steel pipe rapid diameter measuring device, lifting work can be carried out, a steel pipe can be conveniently clamped, steel pipes of different lengths can be clamped, stable and effective clamping work is provided for the steel pipe, and accurate diameter measuring work can be carried out on the steel pipe.