9250results about How to "Improve test accuracy" patented technology

A breath test for diagnosing the presence of Helicobacter pylori in a subject is described. The method of diagnosing Helicobacter pylori is performed as follows. First, a safe and effective amount of urea, preferably appropriately labelled, is administered to the subject. Second, a plurality of the exhaled breaths of the subject is analyzed to detect the concentration of a cleavage product or products, produced when urease cleaves the substrate. The measured concentrations are then fitted to a curve, and the derivative is then calculated, to indicate the presence or absence of Helicobacter pylori infection in the subject.

The invention discloses a testing method based on software defect mode, comprising the steps of: reading source code files of programs to be tested and SDSM description file of a defect state machine, carrying out pre-processing of the programs to be tested, analyzing the SDSM description file; carrying out lexical analysis and grammar analysis of the programs to be tested and constructing abstract syntax tree; generating a control flow graph and a symbol table according to the abstract syntax tree and carrying out the calculating and updating of variable value interval sets according to the control flow graph and the symbol table; carrying out function invoking relation analysis of the programs to be tested and generating a function invoking relation graph; searching the control flow graph by taking the function as unit according to the function invoking relation graph, calculating the state migration of each node defect state machine on the control flow graph, and reporting corresponding checking point when the defect state machine enters the defect state. The invention also discloses a testing system based on software defect mode, which comprises an input module, a defect mode uniformity testing frame and a user interface module and completes the uniform test on the programs to be tested.

The invention relates to a material mechanical property in-situ testing system and method in a dynamic and static load spectrum, and belongs to the field of mechanical tests. The system integrates the following functions: a static testing function of biaxial drawing and shearing in an orthogonal plane, a shearing static testing function, a double shaft pull-pull mode fatigue testing function, and a static/dynamic press testing function. A complicated static/dynamic load spectrum can be established. Multi-mode composite load mechanical property evaluation can be performed on a film material or a block material, for example: high-cycle fatigue tests based on double-shaft pre-stretching load and impact press tests based on double-shaft stretching-shearing pre-load. At the same time, special defects are pre-fabricated on the central area and cross shaped arm area of a test piece; the analysis functions of a variable-zoom optical imaging system or a digital speckle strain analysis system can be utilized; the provided system and method can also be used to research the deformation behavior and cracking expansion rules of micro defects in a component under a multi-dimensional stress, and an evaluation tool is provided for performance degradation rules of products and optimized preparation method of materials.

The invention provides a vibration fatigue life predication method and system for a micro-packaging assembly. The method comprises the following steps: creating a vibration simulating finite element model according to the structures of the micro-packaging assembly and a fixing part; extracting the verification characteristics parameters; modifying the vibration simulating finite element model according to the verification characteristics parameters and the experimental characteristics parameters of the micro-packaging assembly to obtain a vibration simulating model; performing random vibration stress response simulation analysis for the micro-packaging assembly according to the vibration simulation model to obtain a dangerous vibration fatigue point; extracting equivalent stress power spectrum density of the dangerous vibration fatigue point under the random vibration load; converting the equivalent stress power spectrum density to obtain cyclic stress time domain data; calculating the vibration fatigue life of the dangerous vibration fatigue point under the random vibration load according to an S-N curve and the cyclic stress time domain data of the dangerous vibration fatigue point; predicating the vibration fatigue life of the micro-packaging assembly by the method of synchronously extracting the response data of the fixing part and the micro-packaging assembly. With the adoption of the method and system, the testing accuracy is improved.

A test and analysis system of digital machine process-dynamics character comprises hardware prepared as arranging acceleration transducer at tail end of cutter, connecting hammer and said transducer to electric charge amplifier being connected to data collector and carrying out data transmission with computer by said collector; and software formed by man-machine interactive boundary and module of data collection, data play-back, hammering test, transmission function analysis, parameter identification, noise test and analysis.

Simulation test equipment for validating the reliability of satellite attitude control and a test method thereof belong to the field of satellite attitude control. The test equipment comprises a ground simulation support module, a fault injection module and a satellite-born module, wherein, the ground simulation support module includes a monitoring terminal, a satellite model, a signal exciting source and a moment reverse-solution unit; the fault injection module includes an analog-to-digital converter, a signal transfer circuit, a fault injection processor, a man-machine interface unit and a digital-to-analog converter; and the satellite-born module includes a sensor, a satellite-born controller and an actuator. The test method comprises the following steps of: fault model setting; satellite initialization; orbit and attitude information renewal; the satellite-born controller collects signals of the sensor and outputs actuator command signals to the fault injection module; the actuator receives actuator pseudo command signals and outputs feedback signals to the fault injection module; the moment reverse-solution unit collects the pseudo feedback signals output by the fault injection module and outputs moment control signals to the satellite model. The equipment and the method of the invention have high feasibility and high performance-price ratio.

The present invention provides a medium material high-temperature complex permittivity measurement method based on terminal short circuit and pertains to technology of microwave and millimeter wave dielectric material complex permittivity measurement. When the present invention adopts the terminal short circuit for measurement of high-temperature medium material complex permittivity, a heat dissipation wave guide, a heat insulation waveguide, a high-temperature waveguide with a certain length, and a coupling device, a short circuit board are together constitute a reactive type resonator, and dimensions and microwave loss of the resonator under different temperature can be obtained by measurement of resonance frequency and quality factor of the resonator, and the complex permittivity of the medium material under the temperature can be further measured. The present invention is suitable for the measurement of the medium material high-temperature complex permittivity of various frequency band based on the terminal short circuit, and meanwhile the present invention can measure the dimension and the microwave loss of the waveguide resonator under different temperature. As the present invention considers the changing of the dimension and the microwave loss of the waveguide resonator caused by the influence of the temperature, the present invention has higher measurement accuracy and smaller error.

The invention discloses a robot reducer transmission performance comprehensive testing device. The robot reducer transmission performance comprehensive testing device comprises a base (14), wherein a drive motor (1), a first coupling (2), a reducer input end torque angular displacement sensor (3), a second coupling (4), a to-be-tested reducer (5), a third coupling (6), a reducer output end torque angular displacement sensor (7), a fourth coupling (8) and a brake (9) are arranged on the base (14), share the same axis on the level direction, and are connected in sequence, and the drive motor (1), the reducer input end torque angular displacement sensor (3), the to-be-tested reducer (5) and the reducer output end torque angular displacement sensor (7) are respectively arranged on the base (14) through a motor support (10), a first support (11), a to-be-tested reducer support (12) and a second support (13). The robot reducer transmission performance comprehensive testing device meets the requirements of transmission performance tests such as high precision composite roller movable teeth transmission reducer ratio, return difference and efficiency, and thus testing efficiency and testing accuracy are high.

The invention relates to the technical field of testing of material complex permittivity, in particular to a method for measuring material complex permittivity based on substrate integrated waveguide round resonant cavities. The method comprises the steps that firstly, the substrate integrated waveguide round resonant cavities with different resonant frequencies (work frequencies) are machined; secondly, for the substrate integrated waveguide round resonant cavities with the same resonant frequency, a sample with material identical to that of a dielectric layer 2, a standard sample with the known complex permittivity and a sample to be measured are respectively loaded, swept-frequency signals are fed respectively through a vector network analyzer, and the resonant frequencies and the quality factors of the three samples are tested; finally, simultaneous equations are established and solved, and then the complex permittivity of the sample to be measured at the work frequency of the corresponding substrate integrated waveguide round resonant cavity can be obtained. A multi-frequency-point clock test of the material complex permittivity can be completed in the mode that the substrate integrated waveguide round resonant cavities with other work frequencies are used and the same test process is repeated. The method for measuring material complex permittivity based on the substrate integrated waveguide round resonant cavities has the advantages that the sizes of the substrate integrated waveguide round resonant cavities are small, machining is convenient, and the precision of a measurement result is high.

The present invention discloses media playing terminal unit video playing quality test method. It contains A1, assigning different sequence of frames number to each video frame of media file, determining said sequence of frames number corresponded different graphic marking, overlapping said graphic marking to media file corresponded video frame; A2, using said media file as testing source transmitting to media playing terminal unit; A3, said media playing terminal unit decoding and outputting said media file code stream, A4, in turn identifying outputted graphic marking in video frame and generating corresponded frame serial number, analyzing said frame serial number, evaluating video playing quality. The present invention solves media playing terminal unit video playing volubility automatic test.

The invention provides an active optical module multi-channel automatic test system and a method. optimal signals emitted by a tested optical module are monitored, and indexes of the incident light power, emission current, bias current, temperature, voltage, extinction ratio, eye diagram allowance, crossing point, OMA (optical modulation amplitude) etc. are measured and calculated; if the above indexes are all in accordance with the standard, the sensitivity of the optical module is tested, the emission optical power of the tested module is enabled to reach the sensitivity of the test standard via the adjustment of an attenuator, and error code tests are conducted; and if there is no error code, indexes of alarm value and alarm recovery etc. of the optical module are tested. According to the test system, an error detector, an optical module test board, an optical power meter, and the attenuator employed by the test system are all multi-channel devices, an optical switch and an optical splitter are combined for time-sharing multiplexing of one oscilloscope, at least 8 modules can be simultaneously tested, the utilization rate of the oscilloscope and the test efficiency of the optical module are greatly optimized, the equipment cost and the manual cost are reduced, and automatic and batch production of the optical modules is realized.

A ramp-type collision experiment system and method for car is disclosed. Said system is composed of a drawing-guiding unit consisting of supporting frames at high end of ramp, steel cable, winding machine and supporting roller, a ramp consisting of horizontal transition segment, curved transition segment and straight acceleration segment, a experiment segment, an observing tower with test equipment, and acceleration tester in experimental car.

The invention discloses an unsaturated soil tester for testing deformation of a soil sample of a clay in real time, which belongs to the technical field of manufacturing of geotechnical engineering measuring instruments. The tester comprises a combined pressure chamber, wherein the combined pressure chamber is provided with a bidirectional moving uploading pressure piston, a sidewall of the combined pressure chamber is transparent, and top of the pressure chamber is provided with an air intake; a strengthening component is arranged at an external side of a transparent sleeve, a clay plate is embedded in a submerged groove at a base of the pressure chamber, and the base is provided with a water inlet and a water outlet; a piston head contacted with the soil sample is an end support plate, the other end of a piston rod is connected with an uploading plate, and the uploading plate is provided with a displacement meter; additionally, the tester further comprises a laser measurement device arranged at the external side of the transparent sleeve, and the laser measurement device is used for measuring the lateral deformation of the soil sample filled in the pressure chamber in real time. The tester can accurately test the lateral deformation and the vertical deformation of the clay in a drying process and a humidifying process, so that a soil water characteristic curve of the soil sample of the clay under a dry-humid circulation state can be obtained. The tester is excellent in test accuracy, simple in structure, convenient to operate and easy to control.

The invention discloses a method for the geometric transformation calibration and the curved surface interpolation modification of a laser line scanning probe, and a device; the noncontact measurement technology is adopted to be used for the accurate calibration and further modification of the probe of a laser line scanning three-dimensional profile measuring system; the method carries out calculation on the basis of the basic measuring principle of a probe system and completely eliminates calibration theory errors brought by the traditional calibration method (such as a polyfit calculation method, etc.). In the detailed parameter calculating process, the statistical analysis technologies of curve analysis and least squares, etc., are adopted by the algorithm; therefore, the requirement of multiscale calibration caused by the related factors of lens distortion, probe assembly and adjustment error, etc. to different calibration areas is fully considered on the basis that the basic principle is fully met, thus leading the probe to have excellent stability and operability.

The invention discloses an automatic measuring system in the center of an antenna phase, which comprises an antenna receiving rotary table subsystem, an emission polarizer subsystem, an emission and reception subsystem, a servo drive digital display subsystem and a computer subsystem. The antenna receiving rotary table subsystem and the emission polarizer subsystem are both connected with the emission and reception subsystem, the servo drive digital display subsystem and the computer subsystem; wherein, the antenna receiving rotary table subsystem consists of a direction rotary table (1), a two-dimensional translation device (2), a bracket (3) and an antenna polarizer (4). The two-dimensional translation device (2) is positioned between the direction rotary table (1) and the antenna polarizer (4) and used for automatically adjusting the positions of an antenna and the rotating axis of the direction rotary table, thereby making the phase center of the antenna near the axle center of the rotary table and ensuring the stable positions of the rotating axis of the direction rotary table and the rotating axis of the antenna polarizer when the direction rotary table is rotating. The automatic measuring system provided by the invention has the advantage of high measuring automation and can be used to accurately mark the phase centers of antennas.

The invention relates to impulse response analytical test apparatus and method for detecting deformation of transformer winding, belonging to the technical field of transformer winding detection. The apparatus mainly comprises an impulse generator, a broadband digital oscilloscope, a computer, a high-voltage probe, a head end signal impedance matching device, a tail end signal impedance matching device and a screened coaxial cable. In the method, site test and analysis are carried out by using the apparatus. The invention has the advantages of high test sensitivity, rapid detection, strong capacity of resisting disturbance and flexible analytical method, and can detect slight deformation of the transformer winding and judge early potential faults effectively with high judging accuracy. The invention can be widely applied to the detection of the deformation of the transformer winding and the state overhauling.

The invention relates to a mobile communication terminal radio frequency testing system, which belongs to the field of mobile communication terminal radio frequency test. The system comprises a comprehensive tester, a frequency spectrum analyzer, a vector signal source, a wideband signal source, a power meter, a direct current source, a temperature control box, a switch control unit and a controller thereof , and a system control platform, wherein the system control platform is connected with the controller of the switch control unit, the temperature control box, the comprehensive tester, the frequency spectrum analyzer, the vector signal source, the wideband signal source, the power meter and the direct current source respectively; and the comprehensive tester, the frequency spectrum analyzer, the vector signal source and the wideband signal source are connected with the switch control unit and a terminal to be tested respectively. The system has the advantages of simple operating flow, clear testing process, quick testing, serious processing on testing result, and good reliability and stability; in addition, the system can quickly and accurately develop a test case meeting self requirement, realize diverse and standard test, also can flexibly extend to the control on other instruments and meters, and realize flexible configuration of the system.

The invention relates to an online material biaxial static-dynamic performance test platform under service temperature, belonging to the field of precision drive. The large-stroke biaxial synchronous identical-speed or synchronous different-speed displacement output is realized by virtue of four groups of piezoelectric actuators which are orthogonally distributed, and the biaxial static tensile test or dynamic fatigue test for a block-shaped material or a film material with a characteristic size being in a millimeter scale can be carried out under a high/low temperature service condition by combining with an embedded high temperature electrothermal alloy sheet/parr patch. The online material biaxial static-dynamic performance test platform is likely to use in conjunction with a scanning electron microscope with a relatively-large vacuum cavity or other microimaging device with an open-type carrier space, such as an optical microscope, an atomic power microscope and a high speed camera, so that the multimode biaxial static tensile test or the large-frequency-range biaxial dynamic fatigue test can be carried out, and the research for the microstructure evolution behavior and fatigue failure mechanism of various structural materials or functional materials under a complicated service condition such as a high/low temperature condition and a static-dynamic plane stress condition can be facilitated.

The invention relates to an in-situ high-frequency fatigue material mechanical test platform under a scanning electron microscope based on a stretching/compressing mode and belongs to the field of machinery and electronics. The test platform comprises a precise loading unit, a precise motion conversion unit, a load/displacement signal acquisition and control unit, a high-frequency driving unit and a test piece clamping and connecting unit. The test platform provided by the invention has the advantages that the structure is compact, the test precision is high, the strain rate and the test frequency are controllable, an in-situ high-frequency test based on the stretching/compressing mode can be performed on a three-dimensional test piece aiming at centimeter-scale or above in characteristicdimension under the condition of observation of various imaging instruments, the on-line monitoring can be carried out on the microcosmic deformation, damage and breaking process of a material under a fatigue stress, and a novel test method for revealing microcosmic deformation behaviors and a damage system of the material is provided.

The invention provides an amplitude and phase test system of active phased-array radar T/R assemblies, and aims at providing the amplitude and phase test system of high efficiency, reliability and test precision. The N T/R assemblies are connected to antenna directional couplers via two paths of test feed power dividing networks respectively; a frequency synthesizer, a pre-stage power amplifier, a sum and difference device, a sum circuit receiver and a test conversion module are connected between the test feed power dividing networks at the front and tail ends respectively; when test starts, a terminal in the emission T test or reception R test mode emits a test instruction to the frequency synthesizer, the frequency synthesizer outputs test start and test pulse signals, and identical test excitation signals are generated in each beat according to the test pulse; and a wave controller controls different paths of phase shifters on the basis of an orthogonal coding rule, orthogonal phase modules is carried out on the test excitation signals respectively, the modulated signals are input to a signal processor, and amplitude and phase test for all the T/R assemblies is completed.