50results about How to "Small repeatability error" patented technology

The invention discloses a double cross beam type six-dimensional force and torque sensor based on low-dimensional coupling. The sensor comprises an outer circular ring wall, an inner circular ring wall, outer-ring stress beams, inner-ring stress beams and a center loading shaft. On the basis of the strain principle of the interior of an elastomer, the outer circular ring wall is fixed, so that force in the x direction, force in the y direction, force in the z direction, torque in the x direction, torque in the y direction and torque in the z direction are measured in a three-dimensional space. Four sets of strain pieces are pasted on the inner-ring stress beams and sense the force in the x direction, the force in the y direction, the force in the z direction and the torque in the z direction respectively in the three-dimensional space. Two sets of strain pieces are pasted on the outer-ring stress beams and sense the torque in the x direction and the torque in the y direction respectively in the three-dimensional space. The double cross beam type six-dimensional force and torque sensor has the outstanding advantages of structural decoupling and small dimensional coupling, thereby being applicable to various occasions and especially applicable to the field of engineering application, based on complex systems, such as intelligent robots.

The invention relates to a system for measuring surface bidirectional reflectance distribution. The system is characterized in that a hemi-parabolic reflector is arranged on the surface of a sample to be measured; a light source system is arranged on one side of a main shaft in the center of the hemi-parabolic reflector, and is opposite to the inner parabolic surface; an imaging system is arranged on a shaft which is intersected with and vertical to the main shaft, and is positioned above a plain shaft; a beam splitter is arranged between the light source system and the hemi-parabolic reflector; the mirror surface of the beam splitter forms a 45-degree angle with the plain shaft; the light source system consists of a light source, a semicircular light source seat and a sliding rail; the radius of the sliding rail is twice of focal distance of a parabolic reflector, and is embedded in the upper edge of the semicircular light source seat; the light source is arranged on the semicircle sliding rail; the plain shaft is parallel to the main shaft; the beam splitter is a half-silvered mirror; the inner surface of the hemi-parabolic reflector is a reflecting coating; and the caliber of the parabolic surface is more than fourfold focal distance. The system can complete measurement of surface bidirectional reflectance distribution in short time, and has smaller repeatability error.

The invention discloses a six-dimensional force sensor. The six-dimensional force sensor is characterized by comprising a circumferential support, a center platform and radial beams, wherein the radial beams are uniformly distributed on the periphery of the center platform; one end of each radial beam and the outer side wall of the center platform are in T-shaped connection, and the other end of each radial beam and the inner side wall of the circumferential support are in T-shaped connection; and beam through holes are formed in the radial beams, so that the stress is concentrated at two sides of the beam through holes. The six-dimensional force sensor is used for achieving decoupling of the six-dimensional force sensor in structure, the sensitivity of the sensor can be improved, and the rigidity of the sensor is ensured.

The invention relates to an attitude control engine vector thrust original position calibration apparatus. The apparatus comprises a standard vector force source, a loading mechanism, a vector force measurement unit, a data acquisition unit and a data processing unit, wherein the standard vector force source is used for generating and controlling nine standard force to act on the loading mechanism according to an execution requirement; the loading mechanism is used for fixing a vector force sensor to be calibrated; the vector force measurement unit is used for acquiring voltage signals output by the vector force sensor to be calibrated and storing the voltage signals to the data processing module; and the data processing module is used for receiving a loading result from the standard vector force source and a measurement result from the vector force measurement unit, and after storage comparison, obtaining a calibration coefficient of the vector force sensor to be calibrated. The attitude control engine vector thrust original position calibration apparatus can be remotely automatically calibrated in a 2Pa high-modulus environment, can effectively eliminate the influence of a propellant supply pipeline and a measurement cable on vector thrust measurement and improves the vector thrust measurement precision.

A system for measuring the drive power of car is composed of rotation speed sensor, drive shaft's torque measuring unit with infrared emitter, infrared receiver, data processing device, transmission lines and accumulator. Its measuring method features that the torque and rotation speed of drive shaft are simulataneously measured and then used to calculate the drive power of car. Its advantages are less investment in equipment and high correctness.

The invention discloses a thin film stain type torque sensor which is composed of an upper adapter flange, a lower adapter flange and a torsion column fixedly connected between the upper adapter flange and the lower adapter flange. The sensor is characterized in that the torsion column is a metal column; arc-shaped grooves are machined in a left side face and a right side face of the metal column correspondingly; triangular holes are machined in an upper portion and a lower portion of the metal column correspondingly; and four thin film sensing elements, provided with four strain sensitive resistors, manufactured by adoption of a thin film sputtering technology are arranged on one side plane of the metal column. The four strain sensitive resistors are assembled into a Wheatstone bridge circuit; and when the upper adapter flange and the lower adapter flange are twisted, the Wheatstone bridge circuit loses balance, and a corresponding torque value can be obtained by measuring an output signal of the Wheatstone bridge circuit. Since the thin film sputtering technology is adopted, the strain sensitive elements are directly manufactured and arranged on an elastic shaft, a hysteresis error, a repeatability error and a temperature drift error of the sensor are greatly reduced, and the measurement precision of the sensor is improved. The sensor is simple in structure and easy to machine.

The invention provides a device and method for accurately measuring the concentration of low-concentration dusts, and belongs to the technical field of charge induction test. The structure of the device for accurately measuring the concentration of low-concentration dusts comprises a test channel, a charge induction assembly stretching into the test channel, and an airflow driver and a processingdisplay which are matched, the front end of the test channel is connected with a trumpet-shaped air inlet tube, the rear end of the test channel is connected with a trumpet-shaped diffusion tube and an airflow driver, and airflow sequentially goes through an air inlet tube, the test channel and the diffusion tube to form the Venturi effect. The detection device has the advantages of simple structure, wide measurement range, high precision of a measurement result especially when the concentration of the dusts is low, and small repetition error. The detection method can highly-efficiently and accurately test the concentration of low-concentration dust airflow, has a high precision, allows the concentration of the dusts to be directly tested through checking meters by establishing an experience database by means of a model, and is widely suitable for every measurement environment.

The invention discloses a full-automatic atmosphere nitrogen dry and wet deposition collecting device. A multi-linkage-rod support drive device is controlled by a rainwater sensor according to the rainwater condition. In rainy days, the rainwater sensor begins to work, an electric signal is transmitted to the multi-linkage-rod support drive device, a deposition barrel cap slides above a dry deposition barrel; when rain stops, the multi-linkage-rod support drive device drives the deposition barrel cap to a wet deposition barrel. According to the device, atmosphere nitrogen is collected to be deposited in an underlying surface substitution method distinguishing mode, and the sample loss caused by the small rainfall amount and the air drying effect can be diminished greatly in a diluting collection mode; the opening and the closing of a conventional slide-type cover plate can be prevented from being interfered by impurities; meanwhile, soluble gaseous nitrogen between an underlying surface and the atmosphere interface can be collected passively in drying deposition collection. The invention also optimizes an atmosphere nitrogen dry and wet deposition sample pretreatment and analysis testing system. The full-automatic atmosphere nitrogen dry and wet deposition collecting device and the atmosphere nitrogen dry and wet deposition sample pretreatment and analysis testing system, which are provided by the invention, are suitable for collecting and analyzing the atmosphere nitrogen deposition, are reliable and feasible, and have a favorable application prospect in the technical field of environment protection.

The invention discloses a test system of a wireless terminal. The system comprises a measured piece, a shielding box body, a test antenna and an absorption screen, wherein the measured piece is a wireless terminal; an internal wall of the shielding box body includes a reflecting portion and an absorption portion, and a reflecting portion surface is at least metal, the reflecting portion is used for carrying out total reflection on a wireless signal transmitted by the wireless terminal, and the absorption portion is equipped with an wave absorbing material and is used for absorbing a radio wave; the test antenna is used for carrying out wireless communication with the measured piece; a material of the absorption screen is a wave absorbing material, and the absorption screen is arranged between the measured piece and the test antenna and is used for absorbing the radio wave; a position relation of the measured piece, the test antenna and the reflecting portion corresponds to a same ellipsoid body; the measured piece and the test antenna are arranged at two focal point of the ellipsoid body respectively; and the reflecting portion is arranged on an ellipsoidal surface of the ellipsoid body. The test system of the wireless terminal in embodiments of the invention has advantages that a test result repeatability error is small, a test result is stable, test efficiency is high, cost is low and so on.

The invention discloses a special working robot multi-dimensional force sensor. The sensor includes a base, an elastic body, a sealing cover and an upper flange which are sequentially connected from up to down, wherein a lower end of the elastic body is provided with a collection circuit board, the collection circuit board is fixedly connected with the base, the elastic body includes a center table, radial beams are arranged circumferentially around the center table, outer sides of the radial beams are provided with peripheral beams, end portions of the peripheral beams are connected with peripheral supports, the peripheral beams and the peripheral supports are connected in an annular mode, outer sides of the peripheral beams are provided with arc grooves, so stress is concentrated at twosides of the arc grooves, and the radial beams are respectively provided with a sensing element used for measuring the force and the torque of the elastic body.

The invention discloses a high-performance torque sensor based on a sputtering film technology. The sensor comprises a transfer upper flange, a transfer lower flange and a torque post, wherein the torque post is connected between the transfer upper flange and the transfer lower flange. The high-performance torque sensor is characterized in that the torque post is a metal post characterized in that film sensitive elements are respectively made on two opposite parallel surfaces by a sputtering technology; arc-shaped grooves are processed in the other two opposite parallel surfaces. Four strain sensitive resistors form a Wheatstone bridge circuit; when the transfer upper and lower flanges twist, the torque post receives the twisting force effect and transfers the effect to strain sensitive resistors; the resistance values of the strain sensitive resistors change; the Wheatstone bridge circuit loses the balance; the corresponding torque value can be obtained through measuring the output signal of the Wheatstone bridge circuit. The sputtering film technology is used, so that the stain sensitive element is directly manufactured on an elastic shaft; the hysteresis error, repeatability error and the temperature drift error of the sensor are greatly reduced; the measuring precision of the sensor is improved; the structure of the sensor is simple; the processing is easy.

The invention discloses a six-dimensional force sensor. An inner ring and outer ring support structure is formed by a centre platform as the inner ring and a circumferential support as the outer ring;the inner end of a radial beam is connected to the middle part of a floating beam, so that a T-shaped beam structure is formed; radial beams in four sets of T-shaped beams are distributed in a crossed manner on the periphery of the centre platform; outer ends of various radial beams are connected onto the circumferential support; and adjacent two sections of floating beams are connected, so thatthe annular centre platform is formed. According to the six-dimensional force sensor in the invention, various through holes and strain sheets are arranged on the radial beams and the floating beams;structure decoupling is realized; a Wheatstone full-bridge circuit is used, so that six-dimensional force measurement can be realized; and furthermore, mutual interference of inter-dimensional force can be effectively avoided.

The invention relates to the technical field of sensors, and discloses a dual-ring type six-dimensional force sensor. The sensor is characterized in that beams are circumferentially and uniformly distributed; a circumferential support and a central table are arranged between every two adjacent beams; each circumferential support is fixedly connected with outer beams of the beams on the two sides of the circumferential support; each central table is fixedly connected with inner beams of the beams on the two sides of the central table; inner beam through holes are formed in each inner beam and penetrate the upper surface and the lower surface of the inner beam; vertical radial beam through holes are formed in each radial beam and penetrate the upper surface and the lower surface of the radial beam, or horizontal radial beam through holes are formed in each radial beam and penetrate the two side surfaces of the radial beam; and resistance strain gauges are arranged on the two sides of each inner beam through hole, each vertical radial beam through hole and each horizontal radial beam through hole. The dual-ring type six-dimensional force sensor disclosed by the invention has the advantages that the strain gauges are adhered to strain centralization positions of the radial beams and the inner flexible beams of a dual-ring type six-dimensional force elastic body, so that the resolution and the inherent frequency are higher than those of the conventional crossbeam deformation rib structure, six-dimensional force measurement can be achieved through Wheatstone full-bridge circuitsaccording to the force sensor principle, and mutual interferences among inter-dimension forces can be effectively avoided.

The present invention relates to a test method for carbon dioxide in active lime, and an apparatus. The apparatus comprises: a spiral lifting bracket, a furnace, a base, a quality control box, a power supply regulator, a weighing display instrument, a temperature controller and a temperature sensor, wherein an electronic balance is arranged in the quality control box, the electronic balance and the weighing display instrument form a circuit connection, a crucible support rod penetrates through a through hole and extends into the furnace hearth of the furnace, and the top end of the crucible support rod is provided with a crucible tray. The test steps comprise: (1) calibrating the electronic balance; (2) placing 1 g of a lime sample into the crucible, and recording the stable-state mass m1; (3) heating to a temperature of 150 DEG C, maintaining the temperature for 1 h, and recording the mass m2; (4) heating to a temperature of 750 DEG C, maintaining the temperature for 1 h, and recording the mass m3; (5) heating to a temperature of 1050 DEG C, carrying out constant temperature calcination for 1 h, and recording the mass m4; and (6) calculating contents of carbon dioxide, impurities and water. According to the present invention, the automated operation of the active lime carbon dioxide test is achieved, the human error is avoided, and the accuracy of the measurement result is improved.

The invention relates to a calibration control system and method for an attitude control engine vector thrust measuring device and solves the problems that an existing vector force sensor is relatively high in uncertainty of a measurement indicating value of a sensor and repeatability is poor if field calibration correction is not performed. The control system comprises a control module, an acquisition module unit, a storage module, a data processing module and a loading mechanism; the loading mechanism comprises a transfer disk, a standard force sensor and an electric cylinder; the transfer disk is used for mounting and connecting a calibrated object, one end of the standard force sensor is connected with the transfer disk, and the other end of the standard force sensor is connected withthe electric cylinder; the control module is used for realizing control on expansion amount of the electric cylinder, the electric cylinder outputs a calibration force to the standard force sensor, and the standard force sensor transmits the calibration force to a six-component sensor by virtue of the transfer disk; and a numerical value acquired by the acquisition module unit is transmitted to the storage module to be stored, the storage module transmits the stored data to the data processing module, the data processing module comprises a decoupling module, and the decoupling module performsa decoupling operation on the data.

The invention discloses a blade machining process. The process dispersion principle is fully adopted; by utilizing a common plane abrasion device, the cost of the device is reduced and, flow line production can be carried out on a production site in batches; meanwhile, a low-melting-point alloy precise positioning mode is adopted, the machining benchmark is converted, a space positioning point isconverted into a plane, so that the machining process is reliable and stable, the production efficiency is improved, the machining quality is guaranteed, large-batch turbine guide blade production canbe met, and the process can be widely applied to machining of aero-engines and turbine guide blades of gas turbines.

The invention discloses a double-phase-lock amplifier used in water quality monitoring equipment. The double-phase-lock amplifier used in the water quality monitoring equipment comprises a signal conversion unit, a signal regulation unit, a double-phase-lock amplifier unit and a microprogrammed control unit (MCU). The signal conversion unit comprises an electro-optical conversion module, a goal response module, a photovoltaic conversion module and an alternative current (AC) amplifier, wherein the electro-optical conversion module is connected with the photovoltaic conversion module through the goal response module, and the photovoltaic conversion module is connected with the AC amplifier. The signal regulation unit comprises a band-pass filter, an AC amplifier and a following and opposition module, wherein an output end of the AC amplifier is connected with the band-pass filter, and the band-pass filter is connected with the following and opposition module through the AC amplifier. The double-phase-lock amplifier unit comprises an analog switch, a low-pass filter and a direct current (DC) amplifier, wherein an output end of the following and opposition module is connected with the analog switch, and the analog switch is connected with the DC amplifier through the low-pass filter. The MCU comprises an analog-digital (AD) sampling module and an MCU, wherein the AD sampling module is connected with an output end of the DC amplifier, and an output end of the AD sampling module is connected with the MCU. The double-phase-lock amplifier used in the water quality monitoring equipment is capable of accurately and stably measuring the amplitude of extracted useful signals.

The invention discloses a wireless terminal test system and a control method thereof. The system comprises a tested piece, a reflecting surface, a rotating mechanism, a test antenna, and an absorbing screen, wherein the tested piece is the wireless terminal; the reflecting surface is used for carrying out total reflection on wireless signals transmitted by the tested piece; the rotating mechanism is used for fixing the tested piece and driving the tested piece to rotate to enable the wireless signals transmitted by the wireless terminal in multiple directions to be sequentially shot to the reflecting surface; the test antenna is used for receiving the wireless signals; the position relation among the tested piece, the test antenna and the reflecting surface is corresponding to the same ellipsoid; the tested piece and the test antenna are arranged at two focal points of the same ellipsoid respectively; the reflecting surface is arranged on the ellipsoid; and the absorbing screen is arranged on the straight line between the tested piece and the test antenna. When the wireless terminal test system of the embodiment of the invention is applied, the system structure is simplified, multiple times of repeated test operation can be avoided, the test result repeatability error is small, the test result is stable, the test efficiency is high, and the cost is low.

The invention relates to a time adjustable pressure differential controller in the technical field of a pressure differential controller and an assembly method thereof. The design of the pressure differential controller is characterized in that a copper joint is connected with a high-pressure air tank and a low-pressure air tank of an adjustable delay pressure differential controller, the copper joint is pushed against the high-pressure air tank and the low-pressure air tank to a pressure differential spring component, and the pressure differential spring component drives a lever pulling plate component and a pressure differential dial pointer; a setting dial adjusts the position of a pressure differential pointer and the differential pressure; a microswitch is provided with three stop spool pins, a switch contact is in contact with the lever head of the lever pulling plate component, and when one circuit is cut off, the other circuit is conducted; a time control module is directly arranged on the housing and is used for adjusting the needed protection time by a time adjustment pointer. The invention has the advantages of small volume, little consumptive material, high reaction sensitivity, small repeatable accuracy error, no influence of environmental temperature, adjustable delay time, wide range of time adjustment and feasible assembly method, and is suitable for the application in an oil supply protector of a center air-conditioning unit.

The invention provides a circular ring type fiber bragg grating (FBG) temperature sensor, which comprises a fiber. A grating is disposed on the fiber. The circular ring type fiber bragg grating temperature sensor further comprises an elastic deformable body. The elastic deformable body is a circular ring, two sides of the circular ring are provided with a through hole and a blind hole, and lower and upper faces are both attached with metal pieces for encapsulation and conduction. The through hole and the blind hole are connected, the through hole is sleeved internally with a capillary metal tube, the capillary metal tube is fixed with an inner wall of the circular ring, the fiber penetrates through the capillary metal tube, the grating on the fiber is located at the axis of the circular ring, and the blind hole is filled with glue for fixing the fiber. The invention has the advantages of high sensor linearity, high sensitivity and excellent repeatability.

The invention discloses a cross-shaped beam-type six-dimensional force sensor elastic body, and relates to the technical field of sensors. Circumferential beams are connected to outer ends of radial beams to form T-shaped structured beam, each circumferential beam is circumferentially and uniformly arranged, the radial beams are arranged along a radial direction, a central table is arranged at a middle part of each beam and is connected with an inner end of each radial beam, each circumferential support is arranged between two adjacent beams and is fixedly connected with the circumferential beams at two sides, a vertical through hole is formed in each radial beam and penetrates through an upper surface and a lower surface of the radial beam, a horizontal through hole is formed in the radial beam and penetrates through two side surfaces, and strain gauges are arranged at two sides of the vertical through hole and the horizontal through hole. The horizontal through hole and the verticalthrough hole are formed in each radial beam, strain of the beam is concentrated at the two sides of the horizontal through hole or the vertical through hole, so that a resistance strain gauge is convenient to measure, the resolution of a sensor is effectively improved, and meanwhile, the rigidity of the sensor is ensured; with the adoption of a symmetric structure, the inter-dimension interferenceis effectively reduced; and the elastic body can be integrally processed, a repeated error is reduced, and the cross-shaped beam-type six-dimensional force sensor elastic body is simple in structureand is easy to process.

The invention provides an atmospheric nitrogen sedimentation intelligent collection and online analysis system based on underlying surface substitution. The system comprises a sample collection moduleused for performing dry sedimentation and wet sedimentation synchronous separation and collection to obtain collected liquid, a sample pretreatment module used for pretreating the collected liquid toobtain a to-be-detected sample, a sample injection control and online analysis module used for controlling sample injection of the to-be-detected sample and measuring the nitrogen concentration of each component, and a data analysis module used for obtaining the nitrogen sedimentation flux according to sample parameters, wherein the sample parameters comprise the sample volume, the nitrogen concentration of each component and the area of the sample collection module. According to the invention, an overall design scheme of the modules of an atmospheric nitrogen settlement online monitoring andanalysis system is completed through a modular and hierarchical design principle, a pure water preparation system, an ultrasonic generator, a meteorological observation device, a data acquisition andtransmission device and the like are integrated, and an unattended complete intelligent atmospheric nitrogen settlement online monitoring system is realized.

The invention discloses a wireless terminal test system and a control method used for the wireless terminal test system. The system comprises a tested member which is a wireless terminal; a reflecting surface which is used for total reflection of wireless signals emitted by the wireless terminal; a test antenna which is used for receiving the wireless signals; and an absorbing screen, wherein the positional relation of the tested member, the test antenna and the reflecting surface is corresponding to the same ellipsoidal surface, the tested member and the test antenna are respectively arranged on the two focuses of the same ellipsoidal surface and the reflecting surface is arranged on the ellipsoidal surface, and the absorbing screen is arranged on a straight line between the tested member and the test antenna. According to the test system, the sum of the power of the wireless signals of multiple directions can be tested in one time, the structure of the test system is simplified, test speed is faster and multiple times of repeated test operation can be avoided so that the test system has the advantages of being low in test result repeatability error, stable in test result, high in test efficiency and low in cost and the test system is particularly suitable for the research and development and production aspects of the wireless performance of the wireless terminal.

The invention discloses an oscillatory blood test instrument, and belongs to the field of analysis devices. The oscillatory blood test instrument comprises a sample entering area, a sample taking area and a detection area which are sequentially connected, the sample entering area, the sample taking area and the detection area are fixedly connected with an instrument support, the detection area is connected with an oscillatory device, the oscillatory device is arranged below the detection area and connected with the instrument support, the detection area is provided with a blood separation box, and the blood separation box is filled with separating liquid. The oscillatory blood test instrument has the advantages that by the aid of sonic-wave oscillation, cells in blood form density echelons according to different densities, so that different kinds of cells are separated, existing blood test time is shortened to 12-14 minutes, repeatability errors are reduced, the error is only 0.07%, and waiting time can be shortened while the blood test accuracy is improved.

The invention relates to an attitude control engine thrust measuring device, thereby solving problems that the existing attitude control engine testing device is large in size and low in measuring precision and can damage a movable frame and a sensor. According to the device, the center lines of a movable frame, a force source loading unit, a force measuring unit and a pre-tightening force deviceare coaxially arranged; a fixed frame is used for bearing an engine thrust; the movable frame is used for mounting an engine and transmitting the thrust generated by the engine; the force measuring unit comprises a steady-state force sensor and a bearing pressure head, the steady-state force sensor is arranged on a measuring force bearing wall and used for measuring the force transmitted by the movable frame, and the bearing pressure head transmits the force of a movable frame front flange to the steady-state force sensor; the force source loading unit is used for realizing standard force source loading of the steady-state force sensor; and the pre-tightening force device is arranged between a movable frame rear flange and the measuring force bearing wall. Therefore, a gap between the movable frame structure and the measuring force sensor is eliminated, and a certain pre-tightening force is applied at the same time.

The invention relates to the technical field of photoelectric measurement, and specifically to a spindle system. The spindle system comprises a motor, a base and a spindle arranged on the base, wherein a measuring device is arranged at the end part of one end of the spindle while a dividing head is arranged at the end part of the other end of the spindle; the spindle is arranged on the base through a holding frame; and multiple rolling balls are arranged between the spindle and the holding frame. The spindle system reduces 0.5 times eccentric error of the spindle, can position a cutter on a cutter head exactly, enables the cutter to be adjusted conveniently, reduce friction between the spindle and the holding frame, prolongs the service life of the spindle efficiently and reduces repeated error of the spindle system. In addition, the spindle system also has the advantages of a light weight and a great supporting capacity.