468results about How to "Improve measurement resolution" patented technology

Methods, systems, and devices can determine spatial relationships between a probe and a target surface. Specular reflections from the target surface vary dramatically with small changes in angle between the scanning beam and the target surface, and as the geometry of the beam scanner and light detector of the probe are often known, and as the angle of the light beam projected from a scanner for accurately generating an image, the pattern of spectral light reflected from the light beam directly back to the detector allows the distance between the probe and the target surface, and / or the angular relationship between the probe and the target surface, to be calculated.

The present invention provides a chromatic confocal microscopic system in which two conjugate fiber modules are spatially configured and employed to conduct a detecting light from a light source and an object light reflected from an object, respectively. By means of the two spatially corresponding fiber modules, the detecting light is projected on the object and the reflected light from the object is entered into the other fiber module. Since each fiber of the fiber module is capable of filtering out the unfocused light and stray lights and allowing the focused light pass therethrough a line slit, thereby minimizing potential interference from light cross talk caused by the overlapped light spots, not only can the present invention obtain the information of surface profile of the object with high vertical measurement resolution, but also achieve high lateral resolution during confocal measurement.

A capacitive sensing apparatus for a vehicle seat includes a deflectable dielectric mat and a flexible printed circuit that wraps around the major surfaces of the dielectric mat to define upper and lower conductor strips that overlap in a direction perpendicular to the dielectric mat. Overlapping regions of the conductor strips define an array of capacitive load cells distributed over the seating surface. A connector stub depending from the flexible printed circuit couples the conductor strips to an external circuit that measures the capacitance of the various load cells to determine occupant weight and weight distribution.

The invention discloses an automatic three-dimensional measuring method for a high-precision blade of an aviation engine. The automatic three-dimensional measuring method comprises the following steps of (1) rectification: performing rectification on a design coordinate system of a design model and a measurement coordinate system of a workpiece entity; (2) path planning: planning a motion path of a distance sensor in a measuring process by using a data processing device so that a measured region of the workpiece entity is in a measurement range of the distance sensor; and (3) automatic measurement: sampling a front region and a reverse region of the workpiece entity by using the distance sensor to obtain a complete surface profile of the workpiece entity. The distance sensor serves as a measuring terminal, and position information of surface points of the measured region can be acquired; and moreover, by a three-axis motion mechanism, measurement on different regions of the workpiece entity can be realized, measured cloud data of points of density of a local range are automatically fused to the same coordinate system, and complete precise measurement on a workpiece and quality testing operation on the workpiece entity are realized.

The invention provides a mobile ultrasonic anemoclinograph and a method for measuring wind speed and direction, wherein the device comprises an ultrasonic wind speed and direction measuring unit, a mobile system carrier speed measuring unit and a system direction measuring unit; the wind speed and direction measuring unit comprises a base, a control circuit board, six measuring arms and six ultrasonic transmitting / receiving sensors; the measuring arms are connected to the base and in an included angle at 60 degrees in turn; each measuring arm is provided with an ultrasonic sensor; the speed and direction measuring unit of the system carrier comprises a speed sensor and a direction measuring component; simultaneously, the invention further provides a method for measuring the wind speed anddirection in actual environment under a mobile condition by ultrasonic, wherein the method comprises the steps of: measuring the wind speed and direction parameters under the mobile condition by the ultrasonic wind speed and direction measuring unit; combining the measured moving speed and direction parameters of the system carrier; and calculating the measured wind speed and direction parametersin actual environment of the system under a mobile condition.

The invention discloses a near-field plume mass-spectroscopic diagnostic E*B probe based on the Faraday cup and belongs to the technical field of plasma mass-spectroscopic diagnosis. The probe mainly applied to measuring near-field plumes of an ion thruster and of a Hall thruster comprises a central frame, ferrite permanent magnets, a flat electrode plate, an electrode plate holder, a collimator tube, a drift tube, a Faraday cup, six carbon steel shells and an anti-sputtering heat-insulating layer. According to the connectional relation, the central frame is used as a core part, the ferrite permanent magnets are distributed on upper and lower surfaces of the central frame, the electrode plate is fixed in the central frame, and an orthogonal electromagnetic field area is formed. The six carbon steel shells are used for packaging, and the front ends of the shells are coated with an anti-sputtering heat-insulating layer. The collimator tube of stainless steel and the drift tube are fitly fixed to the centers of two ends of the central frame through shaft holes. Ions different in valence are screened by adjusting voltage among the electrode plates, univalent and bivalent ion currents are acquired with the Faraday cup of aluminum, and the ratio of near-field plum bivalent ions is acquired by analytical computing.

A method for measuring time interval with two stage cascade delay line includes measuring numbers of clock leading edge in time interval to be measured i e cycle number of clock, measuring two time intervals not being complete cycle of front and back time intervals to be measured, sending those less than resolution of first stage relay line to the second stage for further subdivision, calculating out value of time interval to be measured by utilizing measured results. The measuring device is composed of only delay unit and D trigger for both delay lines.

The invention discloses a magnetic azimuth measuring system based on a giant magneto-resistance sensor, a measuring method and a perpendicular compensation method so as to realize omnibearing measurement of a magnetic azimuth and reduce measurement error caused by non-orthogonal and zero deviation of a three-axis sensor. The measuring system comprises an earth three-axis magnetic measurement module, a three-axis attitude measurement module, a temperature measurement module, a microprocessor and an upper computer. The invention relates to the technical field of intelligent sensor technologies,digital signal processing and the like. The invention provides an intelligent octant judgment method based on a three-axis acceleration sensor against the multi-valued problem of azimuth measurement caused by a mathematical model when the giant magneto-resistance sensor is used for performing the azimuth measurement so as to realize the omnibearing angle measurement based on the giant magneto-resistance sensor. Simultaneously, the invention provides a three-axis orthogonal and zero compensation method which is completed in the microprocessor against the measurement error caused by the three-axis non-orthogonal and zero deviation of the giant magneto-resistance sensor so as to improve the measurement precision of the measuring system. In addition, the invention further has the characteristics of low development cost, simple hardware circuit and the like.

A microfluidic device for detecting a flow parameter, includes a channel configured within a base body, the channel including a first inlet for feeding a first fluid and a second inlet for feeding a second fluid so as to form a fluid stream having the first and second fluids within the channel, and further including an output for providing the fluid stream on the output side, a first feeder including a micropump associated with the first inlet for selectively feeding the first fluid to the channel, a second feeder associated with the second inlet for feeding the second fluid to the channel; and a detector for detecting, on the basis of a different physical property of the first fluid and the second fluid within the channel, a measurement value dependent on a current flow parameter of the first or second fluid.

The invention discloses a measuring method and device for focusing and leveling, and relates to a new method for the focusing and leveling sensor system of a wafer applicable to the projection photolithography system, and belongs to the field of optical measurement. The invention consists of three parts, namely, a light source collimating module, a focusing subsystem and a leveling subsystem. The laser of the invention emits laser light, the laser light is collimated by a single mode fiber and then passes through a drift compensation device, and then permeates a polarized optical splitter and a Lambda fourth wave plate and then shines on a measured silicon chip. The ray is led to pass through the measured silicon chip repeatedly through a planar mirror and a corner cube prism, and then is magnified in front of a position detector by a lens system, thereby obtaining the defocusing information of the silicon chip surface. The ray is rebounded along the path by a planar optical splitter, the ray permeates a lens and shines on a position-sensitive detector, thereby obtaining the two-dimensional inclination information of the silicon chip surface. The system has high resolution as well as simple structure of optical path and needs no complicated optical design.

The invention discloses an implantable human blood glucose concentration continuous monitoring system based on optical fiber attenuation total reflection, consisting of double optical paths and comprising a light source, an attenuator, a spectroscope, an optical fiber coupling device, an optical fiber ATR sensor, a measurement photodetector, a reference photodetector, a data collection system anda computer, wherein after being attenuated by the attenuator, the light source is divided into two optical paths formed by a measurement light and a reference light; in one optical path, the measurement light enters the optical fiber ATR sensor in a coupling way through a coupling method by the optical fiber coupling device and is received by the measurement photodetector via a transmission lightof the optical fiber ATR sensor; in the other optical path, the reference light is directly received by the reference photodetector; signals recevied by the measurement photodetector and the reference photodetector are synchronously collected by the data collection system, are sent to the computer and are in analysis treatment, and the computer displays a measurement result and is also connected with the light source. The invention adopts a direct measurement in vivo method to directly measure the glucose concentration in a tissue fluid, thereby avoiding an error of measurement in vitro.

The invention discloses a piezoresistive-material-based resistivity imaging flexible pressure detection system, which comprises a pressure detection pad (1), a temperature sensor (2) buried in the pressure detection pad (1), injection electrodes (3) connected to the edge of the pressure detection pad (1), a plurality of uniformly distributed receiving electrodes (4) connected to the periphery of the pressure detection pad (1), wires (5) connected to the receiving electrodes (4) and the temperature sensor (2) and a signal acquisition circuit (10) connected with the wires (5), wherein the pressure detection pad (1) is made from a piezoresistive material; and when certain pressure is applied to the pressure detection pad, the resistivity of the material in the pressure detection pad can be changed. The injection electrodes connected to the pressure detection pad are used for injecting current into the pressure detection pad, the receiving electrodes arranged around the detection pad are used for receiving detected voltage signals, and an electrical impedance tomography principle is used for calculating resistivity distribution in the pressure detection pad to further invert the distribution of the pressure born by the pressure detection pad.

The invention discloses a method and device for high-accuracy and small-angle measurement, wherein the method comprises the following steps: polarizing and splitting the reference light beam which is obtained after the collimation processing to obtain the first linearly polarized light; converting into the circularly polarized light and radiating to a measuring target mirror after the beam expansion; detecting the reverse return of the light beam which is reflected by the target mirror; carrying out the beam contraction and the secondary conversion to obtain the second linearly polarized light; polarizing and splitting the second linearly polarized light again and dividing the second linearly polarized light into the reflected light and the transmission light which have the light intensity ratio of 1 to 1; respectively radiating the two beams of light to two prisms to be reflected; and respectively receiving and processing the reflected light signals through two detectors. The device disclosed by the invention comprises a laser emitting unit, a beam expansion lens unit, a measuring target mirror unit and a differential detection unit, wherein the laser emitting unit comprises a light source, a single mode fiber, a collimation lens, a polarization splitter and a lambda / 4 wave plate; and the differential detection unit comprises the splitter, the two prisms and the two detectors. The method and device disclosed by the invention have the advantages of ultrahigh accuracy and large measuring range.

The invention discloses a dual-loop DLL-based three-segment type high-precision time-to-digital conversion method and circuit. According to a measured time segment, a high-middle-low combined segmental type quantization method is adopted. A high-segment bit counting type quantizer in three-segment type TDC (time-to-digital conversion) is driven by a high-frequency stabilizing clock which is inputted from the outside, so that a wide-range stable distance measuring range can be realized; a middle-segment bit TDC is formed by a first DLL voltage controlled delay chain; high-segment bit subdivision can be realized through an asynchronous sampling mode, and repeatable uniform phase distinguishing can be accomplished in a stable clock period; a phase position at a termination time point is decoded, so that a middle-segment quantization function can be accomplished; and according to quantization errors generated by time-to-digital conversion in a middle-segment bit, error time is extracted, a low-segment bit accomplishes further quantization processing, and therefore, higher measurement precision can be realized.

A morphology measurement device of transparent object based on digital micro-lens and data synthetic technology consists of a digital micro-lens, a light source illumination unit, two image receiving units with CCD video cameras and two reflectors. It is featured as utilizing multifunction of reflector and spectroscope as well as light beam modulator undertaken by digital micro-lens in measurement system and applying phase-shift digital hologram technique for realizing high-resolution outline measurement of object to be measured.

The invention provides a detection method and device of a track regularity state. The track irregularity is measured through a preset chord measuring method, and the chord measuring value corresponding to the preset measuring position is obtained; according to the incidence relation of the chord measuring value and the track irregularity, a mathematical model between the chord measuring value and the track irregularity is established; back calculation computing is carried out on the chord measuring value according to the mathematical model, and the track geometric shape and location are obtained; and filtering is carried out on the track geometry, and the track irregularity is output. The mathematical model between the track irregularity and the chord measuring value is established again, and the chord measuring value serves as a state quantity for the track irregularity. Back calculation is carried out on the track irregularity through the state quantity. By means of the method, a transfer function can be basically stabilized within 1+ / -0.2, the track irregularity can be measured more accurately, and the principle of least squares is involved in a one-chord and multi-point chord measuring method. The track irregularity is corrected through the multi-point measuring value, and the measuring precision and the measuring resolution ratio of the detection method and device are improved.

The present invention discloses a shallow river water depth surveying and mapping system and method based on unmanned aerial vehicle multi-view shooting. The method comprises step S1: determining a surveying time, a surveying area and surveying precision; S2: setting ground control points GCPs in the surveying area, and using a positioning instrument to perform positioning on the control points; S3: planning a flight line of an unmanned aerial vehicle, and performing aerial shooting according to the pre-determined air line; and S4: using unmanned aerial vehicle image analysis software to process an image of the multi-view shooting in step S3, surveying an orthoimage and a digital surface elevation model of the area, and applying an optical model water depth inverse program to perform refraction correction and to perform inversion to obtain a water depth value of a shallow river. Compared with conventional GPS measurement, total station measurement and echo sounding, the method is time-saving, labor-saving and cost-saving, causes no damage to a water body and a river bed, and has relative high execution efficiency; and water depth surveying and mapping is extended from point measurement to face measurement, a relatively high spatial resolution is provided, and water depth measurement precision and a spatial resolution are also improved.

The present invention relates to a shaft encoder device, comprising magnetic sensor means designed to detect the magnetic field of a magnetic field generating means stationary with respect to the shaft, a light source, optical sensor means designed to detect light emitted from the light source and reflected or transmitted by an encoder disk stationary with respect to the shaft, and signal processing means designed to receive first data from the magnetic sensor means and second data from the optical sensor means, and to determine an angle of rotation of the shaft from the received first data and / or to determine the angle of rotation of the shaft from the received second data.

The invention discloses a laser measurement device for a centralization error. The laser measurement device is composed of a first to-be-measured shaft, a laser emission device, a second to-be-measured shaft and a laser receiving device. The laser emission device is fixed to the first to-be-measured shaft, and the laser receiving device is fixed to the second to-be-measured shaft. A laser emitter in the laser emission device emits four criss-cross laser rays at fixed intervals through two cross laser devices, and the laser receiving device can detect the precise positions and width of the laser rays emitted by the laser emission device. The centralization error of two shafts, namely, the first to-be-measured shaft and the second to-be-measured shaft, can be measured indirectly at one position, the advantages of being fast, accurate and convenient and easy to use are achieved, and a traditional method can be completely replaced. The laser measurement device can be applied to detection and adjustment of the centralization error of two linkage rotary shafts in the mounting, debugging and maintenance process of a rotary machine.

The invention discloses a combined sensor applied to measurement of a water ratio in an oil well and mainly solves the problem that the measurement resolution of common sensors for the water ratio is reduced under the condition of low-flow oil-water stratified flows in the prior art. The combined sensor applied to the measurement of the water ratio in the oil well is characterized in that: an electrode rod of a coaxial capacitance sensor is embedded at the central position of a tubular capacitance sensor; the electrode rod consists of an inserted electrode bar and an insulating layer coated outside thereof; the inserted electrode bar in the electrode rod is connected in parallel with a metal tubular electrode; the two electrodes are subjected to sealing treatment to insulate from a shell, and leads of the two electrodes are led out to connect the same exciter in a parallel connection mode on a circuit; and the metal shell serves as a grounding terminal. Compared with the conventional tubular sensors and coaxial capacitance measurement sensors, the combined sensor has wider response range when the oil water stratified flows flow in the sensor; under the condition of no stratified flows, the structure of the combined sensor increases an effective area in contact with oil bubbles, and limits the range of activity of the oil bubbles, thereby improving the measurement resolution.

An electronic control unit for a device for measuring a measurement variable, wherein a first inductance is supplemented by a capacitance to form a parallel resonant circuit and is excited by a micro-controller. A measuring inductance coupled to the first inductance is measured by the electronic control unit. Therefore, a measured variable can be deduced and only very few components are required in addition to the electronic control unit.

The invention provides a micro-ohm resistance measurement system based on a LabVIEW platform and aims to solve the technical problem that low resistance (contact resistance between a movable contact and a static contact of a circuit breaker, a lead resistance and the like) is inaccurately measured in the field of electronic measurement. The system comprises hardware and software, wherein the hardware consists of an alternating current constant current source, a reference signal source, a low-noise pre-amplifier, a data acquisition card, a direct current power supply and a computer; and the software consists of a data acquisition control module, a LabVIEW digital filtering module, a LabVIEW cross correlation module and a data postprocessing module. According to the system, a virtual instrument cross correlation detection technology is adopted, so that the micro-ohm resistance is effectively measured; a personalized automatic measurement system which is flexibly and conveniently programmed, concise and high-efficiency, inhibits noise and has high useful signal recovery and extraction capability, measurement accuracy and resolution and stable performance is built; and the system has real-time displaying, storage and playback functions.

The invention relates to a segmental capacitor type continuous liquid level sensor, and in particular relates to a capacitor type sensor for measuring continuous liquid level. Inner electrodes, outer electrodes, a connection bush, coupling screws, soldering flakes, a cable and a digital processor are arranged in the sensor, wherein the outer electrodes are divided into an odd group and an even group; the soldering flakes are riveted on the outer electrodes through rivets, used for connecting the cable, and connected in series with the odd group and the even group respectively; the outer electrodes are sequentially connected together through the connection bush and fixed by use of the coupling screws; the inner electrodes and the outer electrodes are concentrically mounted to form an annular capacitor, namely the segmental capacitor; and the signals of the segmental capacitor sensor are processed by the digital processor which outputs the liquid level height. The sensor provided by the invention has the advantages of high measurement resolution, wide measurement range, fast dynamic response and the like, realizes automatic calibration and saves zero setting.

The invention relates to a system and a method for large-range synchronous real-time meteorological data measurement and wind speed and direction prediction. The system consists of a high-precision acquisition terminal, a wireless transmission device and a data center. A large-range synchronous real-time meteorological data acquisition, analysis and prediction system consisting of a data center, a plurality of data acquisition terminals and wireless transmission systems can be established by using the system and the method. According to the system and the method, a BP (Back Propagation) nerve network model is utilized, wind speed and wind direction of a target node within 5 minutes can be predicted according to present meteorological data of all points of the system; in order to improve the prediction accuracy, the prediction model consists of eight prediction models, that is, daytime in spring, night in spring, daytime in summer, night in summer, daytime in autumn, night in autumn, daytime in winter and night in winter, each model is acquired through a great amount of data samples through nerve network training and learning, and moreover in the application process, the prediction model is continuously improved according to errors between actual measurement data and prediction data.

The invention discloses a microelement interwell tracer agent and the application of the microelement interwell tracer agent, and relates to oilfield flooding micro tracer agents and a using method of the tracer agents in oil reservoir dynamic monitoring. Microelements which are not included in a stratum or fluid of the stratum or minimal microelements which are included in the stratum or the fluid of the stratum serve as the tracer agent, a macromolecule hydrophilic complex and rare earth elements are adopted to carry out complexation to prepare the tracer agent, the tracer agent is injected from an injection well, then sampling is carried out on surrounding production wells according to a certain sampling rule, the production condition is monitored, samples are analyzed, and a tracer production curve is obtained. The microelement interwell tracer agent is high in stability, and the thickness and permeability of a water flooded layer, the diameter of a duct, and the positions of external channeling and fractures of an injection well pipe can be determined accurately and conveniently.

The invention discloses a variable rod length articulated arm type coordinate measuring machine which comprises a base, three rotary joints, three swing joints, a base measuring arm, two measuring arms and a measuring head, wherein the two measuring arms are telescopic measuring arms with the same structure, and each telescopic measuring arm comprises a core shaft, a fixing screw, a sleeve and a guide key; for each telescopic measuring arm, the core shaft is mounted in the sleeve, the two are in clearance fit, a section of guide slot is arranged on the inner wall of the sleeve, the guide key is arranged on the core shaft, the relative circumferential fixation of the core shaft and the sleeve can be realized through the guide key, two thread holes are arranged on the sleeve, the fixing screw is screwed in the sleeve through the thread holes, a section of V-shaped slot is arranged on the core shaft, and the fixing screw is screwed for leading an circular arc-shaped head of the fixing screw to tightly push the V-shaped slot of the core shaft, thereby realizing the relative fixation of the sleeve and the core shaft. The variable rod length articulated arm type coordinate measuring machine can reduce the size of measurement space by regulating the rod length of the measuring arms, reduce the measurement error, improve the measurement resolution, achieve the best measurement efficiency, and still have higher repeated positioning precision after the length change of the telescopic measuring arms.

A biological information measuring apparatus includes a plurality of light emission sections, a plurality of light detection sections, and a control section. Each light emission section injects, into a living organism, a spectrum-modulated light beam having a specific wavelength. The control section acquires a spread code sequence employed by each of the light emission sections for spread spectrum modulation, and supplies the spread code sequence to the light detection sections. By use of the spread code sequence, each light detection section selectively receives a specific reflected light beam having the spread code sequence, which is selected from among the light beams which have been emitted from the light emission sections and reflected in the living organism. Subsequently, each light detection section despreads an electrical signal corresponding to the thus-received reflected light beam, and outputs a detection signal corresponding to the intensity of the reflected light beam.

A system for measuring object points on a three-dimensional object using a planar array of a multi-camera group, and a measuring method, are provided. The system is useful in the field of optical measuring technologies. The method includes establishing a measuring system of at least one four-camera group wherein digital cameras form a 2×2 array; matching an image object point acquired by the camera group; upon matched object point image coordinates, calculating coordinates of spatial locations of respective object points; upon coordinates of the spatial locations, calculating other three-dimensional dimensions of the measured object to be specially measured to form three-dimensional point clouds and establish a three-dimensional point clouds graph for performing three-dimensional stereoscopic reproduction. Here, full matching is performed for all measured points of the measured object by directly translating, superimposing, and comparing, point-by-point, the pixel points of measured images in X and Y-axes directions. In this way a three-dimensional object may be reproduced.

The invention discloses a mini three-dimensional scanning confocal microscope. The double-comb linear scanning comprises an actor, two X linear drivers using as stator, Z linear driver, the second microlens is set on the actor, the light from the point-source become to the collimated light laser beam after passing the fist microlens, the beam goes through the mini optical spectroscope, reflected by the micro-scanning reflector, and focalize on the sample by the second microlens, the reflected or fluorescence light passes the second microlens and the micro-scanning reflector along the original path and returns to the mini optical spectroscope, the reflected light shines in the micro-light detector through the third microlens and the pinhole, the controlling device is used to collect and process the data and control said linear scanning on the focus of the direction X and Y.