199results about How to "Reduce sources of error" patented technology

The invention relates to a multisensor-based three-dimensional outline measuring device and a measuring method thereof. The measuring device comprises a base plate, a vertical movement platform, a working table surface and light measurement sensor assemblies. The working table surface is provided with four or more than four light measurement sensor assemblies which are evenly distributed around a measuring hole; each light measurement sensor assembly comprises a laser, a camera and a camera mount; the lower end of each camera mount is buckled on an assembly guide way which is fixed on the working table surface; the cameras are arranged on the camera mounts; and the lasers are fixed on the working table surface. The invention utilizes the light measurement sensor assemblies to improve the measurement speed and provides an effective technical measure for the batch detection of industrial site components; and the invention adjusts field coverage and amplification ratio according to the surface shape of a tested component and is adapted to the measurement of a complex curve surface of a blade or a conical gear, and the like, which cannot be effectively measured by using conventional methods.

The invention relates to a planar constraint based robot calibration method. The planar constraint based robot calibration method specifically comprises the following steps of utilizing a DH and MDH combination method to establish a robot kinematic model, establishing a robot tail end position error model based on a differential conversion principle, establishing a position calibration model of a robot based on planar constraint, setting a calibration block pose position, demonstrating and recording the robot tail end theoretical pose position, calibrating motion parameters of a robot, utilizing a calibration result to perform comparison, and performing re-calibration if the accuracy requirement is not met. The planar constraint based robot calibration method has the advantages of being simple, practical, efficient and low in cost, expensive measurement instruments are not needed, calibration cost is reduced, and positioning accuracy is improved.

A method for detecting 3-D information of rut on pavement includes forming structure light strip of structure light laser to be an image on surface array CCD after said structure light strip is modulated by 3-D information of pavement in order to obtain pavement information for making calculation through relation matrix, filtering disease influence off, calculating parameter by utilizing virtual straight scale, storing data then analyzing and displaying data. The detection device used for realizing said method is also disclosed.

The invention discloses a lightning effect test device for a dynamic airplane. A computer in the device is arranged outside a microwave dark room; a round turntable A, a round turntable B, an airplane scale model, a lightning generator, a spectrum recorder, a support platform and a camera are arranged in the microwave dark room; the camera is mounted on the support platform; the airplane scale model is mounted on the round turntable A; the spectrum recorder is mounted on or in the airplane scale model; and the lightning generator is mounted on the round turntable B. When the round turntable A and the round turntable B rotate relatively, various types of lightning analogue currents and electromagnetic waves generated by the lightning generator act on the airplane scale model; and when the lightning happens, the spectrum recorder records the lightning indirect effect, and the camera records the lightning direct effect. According to the invention, the process that the airplane in dynamic flying mode encounters lightning can be simulated in the limited space of the microwave dark room so that the tested data approaches to the real conditions better and the error is reduced.

The invention relates to a mechanical arm tail-end pose error correction method based on elliptic characteristics. The method comprises the steps of obtaining an image of a round-mouth target tank, extracting a target ellipse from the image, determining the relative position and axial relation between a tank mouth of the round-mouth target tank and an actuator according to the elliptic characteristics of the target ellipse, determining a current pose of the actuator, joint angles of all joints of a mechanical arm and the pose deviation value of the actuator according to the relative positions,the axial relation and configuration constraint of the mechanical arm, and adjusting the mechanical arm according to the pose deviation value till the pose deviation value of the actuator is smallerthan a preset value. By means of the method, the problems that single elliptic characteristic positioning has ambiguity and axial rotation poses cannot be determined are solved, accurate guidance canbe provided for the mechanical arm to collect samples and put the samples into the target tank, and control errors caused by local flexibility or joint clearance are corrected. The invention further provides a mechanical arm tail-end pose error correction system based on the elliptic characteristics.

The invention discloses a method and a device for determining the water saturation of a stratum, and belongs to the field of oil well logging technologies. The method includes selecting series representative cores of a measured region, and measuring values of porosities POR of the series cores and values of specific resistance R<w> of saturated stratum water of the cores; creating a functional relation m(POR, R<w>) among bond indexes m of the cores, the porosities POR of the cores and the specific resistance R<w> of the stratum water; creating a functional relation n(R<w>, POR) among saturation indexes n, the porosities POR of the cores and the specific resistance R<w> of the stratum water; solving the water saturation S<w> of the stratum by the aid of an Archie water saturation interpretation model. The device comprises a selecting module, a parameter measuring module, a bond index creating module, a saturation index creating module and a saturation computing module. The method and the device have the advantages that the functional relations among values of the bond indexes m, values of the saturation indexes n, the porosities POR and the specific resistance R<w> of the stratum water are created, so that the values of the bond indexes m, the values of the saturation indexes n, the porosities POR and the specific resistance R<w> of the stratum water are relevant to one another, and the computed water saturation of the stratum is accurate and reliable.

A method and device for measuring displacement delay and axle direction of 1/4 wave-plate. Its principle is: uses light intensity detecting technique of elliptical polarization, setslambda/4 Fresnel double diamond and 1/4 wave-plate between polarizer and analyzer in turn, rotates wave-plate and analyzer to different position and detecting output light intensity, finally achieves displacement delay and axle direction of 1/4 wave-plate. The invention can detect displacement delay and axle direction of 1/4 wave-plates with different wavelength in a wide spectral range, which has high detecting precision, convenient operation and automatic measurement.

A point-diffraction interference wave aberration measuring instrument consists of a light source, a light splitter, a first light intensity and polarization adjuster, a phase shifter, a second light intensity and polarization adjuster, an ideal wave front generating unit, an object precise adjusting platform, a measured optical system, an image wave front detecting unit, an image precise adjusting platform and a data processing unit. The interference instrument has the advantages of simplicity in structure, no systematic error of a phase shifting element, high interference grain visibility and capability of calibrating the systematic error.

The invention discloses a tracing to the source direct current correcting method for a Delta-typed direct current. By externally adding a stable AC voltage source, AC voltage output forms a voltage channel by a voltage divider, low conversion voltage value of a voltage loop is obtained from the voltage channel; the AC voltage output of the stable AC voltage source is connected with a current transformer by a high precision resistance, thus forming a current channel; and the measured voltage value representing current is obtained from the current channel by impedance conversion; precise stable voltage direct current reference voltage and the measured conversion voltage value of the voltage loop are connected into an AC/DC voltage comparator with self correction, so as to obtain a sine voltage output by the voltage source steadily; composite ratio and angular difference of the current transformer and an equivalent impedance of a secondary load are obtained in a way that the measured voltage value obtained in the AC/DC voltage comparator is combined and connected based on the obtained sine voltage, error compensation parameters are stored for error compensation of impedance conversion measured by the following current. The invention has few error sources, simple electrical structure and high precision.

The invention discloses an optical fiber current sensing method used for monitoring subway stray current and a sensing device thereof. Light-transmitting parts and sensing parts in the optical fiber current sensing device adopted by the invention are connected by all-fiber. The measurement results of the existing subway stray current monitoring method which is based on polarization potential monitoring are affected by factors and evaluated in a non-directviewing way. The invention is based on faraday effect, utilizes polarization property of optical fiber and indirectly measures current by measuring faraday rotation angle in the optical fiber, thereby overcoming the disadvantages of the traditional stray current monitoring method. The method has the prominent advantages that system test sensitivity can be adjusted according to specific conditions so as to be suitable for measuring current with different ranges. In the invention, the all-fiber is used for transmitting, thereby ensuring simple light path and good insulating property; closed circuit integral of a magnetic filed generated by current is detected by the sensing device, so that the measurement results are difficult to be affected by a stray field; the measurement frequency band is wide, and the dynamic range is wide, therefore, the invention has good project application prospect.

The invention discloses a method and apparatus for determining a surface temperature by use of middle-infrared remote sensing data. The method comprises the following steps: step A, determining surface bidirectional reflectivity of a twenty-second channel (3.929[mu]m to 3.989[mu]m) and a twenty-third channel (4.020[mu]m to 4.080[mu]m) by use of radiation brightness data and atmosphere parameter data of the twenty-second channel and the twenty-third channel of a middle-infrared wave spectrum zone of moderate-resolution imaging spectroradiometer (MODIS) data through a developed middle-infrared surface bidirectional reflectivity remote sensing inversion method; step B, by use of the surface bidirectional reflectivity obtained from the step A, through a developed surface direction ratio radiant ratio remote sensing inversion method, determining surface direction ratio radiance; and step C, by use of the middle-infrared surface bidirectional reflectivity and the direction ratio radiance respectively obtained from the step A and the step B, through a developed surface temperature remote sensing reversion method, determining the surface temperature. The method and apparatus provided by the invention effectively realize quantitative remote sensing inversion of the surface temperature through the middle-infrared data.

The invention relates to a preparation method and an application of a double-rate-type (ultraviolet/fluorescence) multifunctional (calorimetric/fluorescence/ultraviolet) high-sensitivity florescent probe for carboxylesterase detection. Firstly, 2,4-dihydroxybenzaldehyde, diethyl glutaconate and anhydrous piperidine react in ethyl alcohol to produce a product 1, the product 1 and acetic anhydride react in anhydrous pyridine to produce a product 2, the product 2 reacts with osmium tetroxide and sodium periodate in tetrahydrofuran to produce a product 3, and the product 3 reacts with anhydrous potassium carbonate in methyl alcohol to produce a product 4; then methylpyridine and methyl iodide react in absolute ether to produce a product 5; next, the product 4 and the product 5 are dissolved in absolute ethanol, piperidine is added for a reaction, and a product 6 is obtained; finally, the product 6 is dissolved in acetic anhydride, anhydrous sodium acetate is added, and the double-rate-type multifunctional florescent probe for carboxylesterase detection is obtained. The probe is applicable to qualitative and quantitative analysis of carboxylesterase in biological samples, is sensitive, accurate and quick in detection, and can be applied to related fields of analytical chemistry, life organic analytical chemistry, disease pre-diagnosis, clinical medical examination and the like.

The invention discloses a device and a method for measuring the doppler frequency shift based on a dual parallel Mach-Zehnder modulator, and relates to the technical field of the microwave technology and the optical communication technology. The device is shown in the figure and includes a laser diode (LD), a dual parallel Mach-Zehnder modulator (DPMZM), an erbium doped fiber amplifier (EDFA), a dense wavelength division multiplexing (DWDM) and a photodetector (LD). According to the technical scheme of the invention, echo signals and sending signals are subjected to carrier-suppressed double sideband modulation by the dual parallel Mach-Zehnder modulator (DPMZM). Meanwhile, the powers of upper and lower sidebands, and the phase difference between upper and lower sidebands are fully utilized for the measurement of the magnitude and the positive/negative attribute of the doppler frequency shift. Therefore, the measurement error is small. The range of the carrier frequency can be freely regulated within a large range, while the deterioration of the measurement error is avoided. In addition, the device has fewer parts, and is simple in structure and easy in operation. The device and the method have a good application prospect in the fields of radar, reconnaissance systems and the like.

The invention discloses a rapid and automatic determination method and device for tripolycyanamide content in dairy products, belonging to the field of food analysis. The method comprises the following steps that: in a unit (A) under an operating procedure, a first step, a multifunctional valve is in a state I, a pump A rotates, a pump B stops, a first sample flows into a column 2 for enriching tripolycyanamide, and the eluent flows into a column 1 for regenerating tripolycyanamide; a second step, the pump A stops, the pump B rotates, the cleanout fluid flows into the column 2 for cleaning the impurities therein; a third step, the multifunctional valve is switched to a state II, eluent flows into the column 2 for eluting and regenerating tripolycyanamide; the tripolycyanamide in the column 2 is substituted by the eluent and directly enters into a sampling ring of a unit (B) in the form of a sample plug, so as to perform volume quantification, injection, re-separation and detection, and a response signal is processed by a computer; and meanwhile, a second sample enters into the column 1 for enrichment, and the process of the column 2 is repeated. The method and the device are high in automation degree and excellent in reproducibility, and can analyze about 30 samples per hour; and the unit (A) in the invention can be used with various flow injection analysis systems.

The present invention discloses a pentaprism scanning detection method for an aspheric reflector. The method comprises: 1) arranging a device required for detection; 2) performing scanning detection of a single bus; 3) performing scanning detection of the next bus of the rotation angle a of the aspheric reflector after the scanning of the single bus is completed; and 4) performing detection data processing and fitting. All the angle differences are transited to the slope values of the corresponding positions of the reflective surface of the aspheric reflector, the slope values are fitted with the Zernike gradient polynomial, and the low-order surface-shaped error parameters of the aspheric reflector are obtained. The high-precision low-order surface-shaped error parameters of the aspheric reflector can be obtained.

The invention relates to an adaptive plane layering method based on an additional material remanufacturing point cloud model. The method comprises: step one, a layering direction is determined; step two, a layering height is determined; to be specific, traverse of point cloud coordinates is carried out to obtain a zmin and a zmax, difference processing is carried out on the zmin and the zmax to obtain a layering height; step three, an inter-layer point cloud mapping relationship is constructed; step four, a surface error is defined; to be specific, a surface error P is defined to express a surface difference degree between two slices, wherein sigma is equal to Rmax and the Rmax expresses a maximum value a radial width R of a projection point cloud; and step five, a layering thickness is determined. According to the adaptive plane layering method, the maximum value of the radial width R of the projection point cloud is used as a surface error and thus an adaptive layering height is determined by iteration; the algorithm implementation process is clear; and both efficiency and precision are considered.

The invention discloses a three pairs of sliding pair-spherical hinge-spherical hinge (3-PSS) mechanism-based coordinate measuring machine. The 3-PSS mechanism-based coordinate measuring machine is characterized in that: a three pairs of sliding pair-spherical hinge-spherical hinge parallel mechanism is provided; three motion sliding blocks are independently arranged on a pair of ball guide rails which are arranged in parallel and can slide freely along the ball guide rails respectively; the three motion sliding blocks are connected with one end of each of three pairs of link rods through one end of a universal joint respectively; the other end of each of three pairs of link rods are connected with a measuring moveable platform through the other end of the universal joint respectively; a measuring head is arranged on the lower plane of the measuring moveable platform; three indication gratings are fixedly connected to the three motion sliding blocks respectively; a scale grating and the pair of ball guide rails are arranged in parallel and are arranged on the guide rail mounting surfaces of guide rail cross beams; and the guide rail cross beams are suspended and fixedly connected to a pair of brackets. The 3-PSS mechanism-based coordinate measuring machine has high rigidity, a simple structure, high processing assembly property and low cost and can measure the three-dimensional space sizes, the shapes and the mutual positions of parts quickly and precisely.

The invention relates to a phase detection method of a cold atom Bose-Einstein condensation vortex superposed-state gyroscope. Superposed-state vortex light is emitted into a Bose-Einstein condensation state gas atom cluster to enable the Bose-Einstein condensation (BEC) atom cluster to obtain a certain orbital angular momentum, and stable vortex superposed-state matter waves are generated; the BEC atom cluster in a potential well is equivalent to a matter wave interference gyroscope. Atom density distribution of the BEC forms a stable gyroscope pattern; when the system rotates at a certain angular speed, a certain phase is generated due a Sagnac effect; each atom has a fixed scattering effect on photons; after detection light is added, a whole resonance absorption image is detected through a charge coupled device (CCD) and scattering light intensity is calculated through space calculation and time calculation; density distribution of the BEC atom cluster is reckoned so as to obtain phase information; relative light intensity change can be obtained through space subtraction, is used as a gyroscope signal and is used for reckoning a system angular speed, so that the sensitivity on the system angular speed is realized.

The invention provides a method and a device for detecting radial runout of a lathe spindle in a machining state. The device comprises a host computer, a core rod absorbing and holding assembly and a dynamic adjusting and testing assembly, wherein the core rod absorbing and holding assembly is fixed on a to-be-machined round bar, and the core rod is absorbed on smooth tempered glass by a strong magnet; the dynamic adjusting and testing assembly is mounted on a bracket with a laser displacement sensor and a nylon push block as cores; the bracket can be arranged at any static part of a lathe body by a magnet base. When the radial runout of the lathe spindle is measured in the machining state, the nylon push block is driven by a differential screw mechanism to push the core rod on the tempered glass, meanwhile, displacement signals of the core rod during rotation are picked by the high-precision laser displacement sensor and transmitted to the computer for processing and displaying, fine adjustment is performed until a peak-to-peak value of a measured value is the minimum, and eccentricity is eliminated once; the measured value is filtered by the host computer, measurement signals with the same frequency as rotating speed are eliminated, and a finally obtained variable range of the measured value is the radial runout affecting machining quality.

The invention relates to a vortex optical gyro. Firstly, with a method using phase modulation according to a vortex light wave function, coupling-state vortex light composed of vortex light having opposite wave front spiral directions and having the orbital angular momentum topological charges of +1 and -1 respectively is generated; according to a sagnac effect, synchronous rotation of a coupling-state vortex light generation system and a to-be-measured object is known to make two beams of vortex light having opposite wave front spiral directions generate an optical path difference related to the rotation speed of the to-be-measured object; the specificity of the vortex light makes the optical path difference reflected in angular frequency movement; an optical path of the vortex light is adjusted to change the propagation direction, then through modulated filtration, the vortex light is received, and a waveform of the vortex light is measured; and through waveform analysis, the angular frequency movement of the superposition-state vortex light is obtained, and angular velocity information of the to-be-measured object is calculated. The vortex optical gyro belongs to the field of new-concept gyro in the inertial technology, and can be applied in the fields of superhigh-sensitivity and miniaturized navigation and positioning in future.

The invention relates to the technical field of photoelectric detection, and especially relates to a device and method for measuring the geometric parameters of a long and thin hole. The device comprises a positioning mechanism, a traveling mechanism and a measurement mechanism. The positioning mechanism is used for the automatic centering of a to-be-detected workpiece. The measurement mechanism comprises an automatic centering head, a toughness measuring rod, a laser, a pneumatic sensor, and a CCD processor. An optical fiber of the laser passes through an internal channel of the toughness measuring rod to be connected with a laser sight, and the laser sight is in signal connection with the CCD processor. An air source of the pneumatic sensor is communicated with a pneumatic centering measuring head through an air inlet of the toughness measuring rod. The traveling mechanism is used for carrying the toughness measuring rod to move, and enabling an automatic centering measuring head atthe second end to move to the inlet of the long and thin hole of the to-be-detected workpiece. The device can achieve the detection of the linearity of the axis and roundness of the long and thin holeconveniently, and is not limited by the rigidity and length of the measuring rod.

A film platinum resistor temperature sensor for measuring skin temperature accurately belongs to the heat comfort research and measuring technology field. The sensor in the invention comprises a film platinum resistor, a polyimides substrate and external wires; the film platinum resistor is disposed on the upper surface of the polyimides substrate, with the two electrodes welded to the electrodes corresponding to the polyimides substrate; and the sensor is connected with data acquisition instrument by electroplating wires and external wires. The invention improves the original contact skin temperature measuring method greatly, fully utilizes the advantages of good skin contact property, good stability, high precision and excellent dynamic performance of the film platinum resistor to measure the skin temperature accurately, controls the sensor measurement error within 0.1 degree centigrade by means of heat simulation research and experiment with finite element method, improves the whole measurement precision of skin temperature, and provides experiment base to the heat comfort physiology index research.