280results about How to "Reduce measurement error" patented technology

A sample measurement device (110), in which a biosensor (30) having an electrode is mounted, voltage is applied to the electrode, and the concentration of a specific component in a sample deposited on the biosensor (30) is measured, comprises a voltage source (19) configured to apply voltage to the electrode, a time measurement component (22), and a controller (18) configured to control the voltage to be applied and measure the concentration of the specific component. The time measurement component (22) measures a detection time, which is the length of time between the mounting of the biosensor (30) and the deposition of a sample on the biosensor (30). The controller (18) changes a set value for measuring the concentration of a specific component according to the detection time. Consequently, measurement accuracy can be improved regardless of the temperature of the biosensor (30).

The invention relates to a laser detection device and method for gear parameters. The laser detection device is characterized in that a worktable is provided with an internal point; a laser displacement sensor is arranged on a bracket; the bracket is arranged on a linear motor sliding block of a sliding table; the sliding table is arranged on an angular displacement rotating system and is fixedlyconnected to a rotating disk together with a rotating shaft; a casing of the angular displacement rotating system is arranged on a lifting arm through screws; the lifting arm is connected with the vertical surface of a machine body through a high-precision linear guide rail and a sliding block; a servo motor drives a ball screw which is fixedly connected to the vertical surface of the machine body to rotate; and a data acquisition and communication system is arranged on a rotating shaft upper plane of the angular displacement rotating system. Tested workpieces are subjected to data measurement, acquisition, transmission, reconstruction, separation, comparison and display to finish the full process of detection. According to the laser detection device and method, the non-contact and blind spot-free measurement is realized, the detection speed and measurement precision are improved; the difficult problem that a pinion is difficult to detect is solved; and in the measuring process, the gear is stationary and a measuring head does measuring movement, thus the measuring error caused by mounting the gear is reduced.

An apparatus for cooking food (10) includes a casing (14), a lid (20) and at least a support unit (11). The casing (14) has a compartment in which to insert a container (12) which may be temporally associated with the support unit (11), and the support unit (11) may be configured to temporally support the container (12) with respect to a support plane. The apparatus for cooking food (10) also includes a first heating unit (16a), a second heating unit (16b), a third heating unit (16c) and a weighing unit (18) associated with a control unit (36).

The invention discloses a target tracking method based on a distributed processing wireless sensor network, which comprises the following steps: observing data by utilizing last moment target state estimation information and current moment task nodes, and performing extended Kalman filter to obtain current moment target state estimation information; calculating to obtain a prior estimation error covariance matrix track of a next moment candidate task node according to the current moment target state estimation information, and comparing and selecting a node corresponding to the minimum track as a next moment task node; and when the prior estimation error covariance matrix track corresponding to the next moment task node is greater than a set threshold, adopting a target track correction algorithm to acquire the current moment target state estimation information again to realize the target positioning and tracking. The method can effectively reduce communication between nodes, save energy resources and communication resources of the nodes, and meet the requirements of accuracy, real-time and robustness of node positioning simultaneously.

The invention belongs to the field of chemistry, and particularly relates to a method suitable for measuring 16 elements including lead, copper, iron, arsenicum, chromium, zinc, cadmium, manganese, nickel, cobalt, indium, rhodium, gallium, bismuth, neodymium and cerium in a food additive citric acid. The measuring method consists of the following steps: firstly, weighing a sample of the food additive citric acid, and putting the sample in a microwave digestion instrument; secondly, performing sample digestion by using a mixed acid of nitric acid and perchloric acid; thirdly, adding a sample solution into hyperpure water according to a proportion that 1 to 2 mL of the nitric acid is added into each 10 grams of the citric acid sample, and moving the mixture into a plastic volumetric flask of100 mL; fourthly, drawing calibration curves: using national standard stock solutions (GBW) containing the 16 elements, using 3 percent nitric acid to dilute the national standard stock solutions into mixed standard solutions with the concentrations of 0.0, 5.0, 10.0, 20.0, 30.0, 40.0 and 50.0 umg/L, and drawing the calibration curves of each elements by using the concentrations as horizontal coordinates and ion abundances as vertical coordinates; and fifth, measuring and calculating the contents of the 16 elements in the food additive citric acid in the sample solution obtained in the thirdstep according to the fourth step.

A method and apparatus adapted to calibrate signal path of a signal analysis system such that loading effects of additional probes are substantially removed from the measurement. A signal under test from a device under test is coupled to a test probe and used with selectable impedance loads in the test probe to acquires sets of samples for characterizing transfer parameters of the device under test and compute open circuit voltages at the test probe. Other probes are coupled to the device under test and a set of measurement samples are acquired via the test probe. An equalization filter in either the frequency or time domain is computed from the open circuit voltage and measurement samples for reducing signal errors attributable to the measurement loading of the device under test by the test probe and other probes.

The invention discloses a micro inertial measuring unit which comprises a shell, a top cover, a main circuit board, a micro inertial measurement combination, a first double-shaft micro-machined accelerometer and a second double-shaft micro-machined accelerometer, wherein the top cover is arranged on the top end of the shell, a cavity is limited by the top cover and the shell, the main circuit board is arranged in the cavity, the micro inertia measurement combination is arranged in the cavity and is connected with the main circuit board, the micro inertia measurement combination comprises a three-shaft micro-machined gyroscope, a three-shaft micro-machined accelerometer and a three-shaft magnetometer; and the first double-shaft micro-machined accelerometer and the second double-shaft micro-machined accelerometer are respectively arranged in the cavity and respectively connected with the main circuit board. The micro inertial measuring unit can be used for measuring motion parameters of a small aircraft under a high-dynamic and large-overload motion state, and calculating a motion attitude and a motion track of the small aircraft.

A printing apparatus includes a full-line printhead in which a plurality of chips, on each of which a plurality of nozzle arrays are juxtaposed, are arranged in the nozzle arrayed direction, and which prints by the entire width of a printing medium using a plurality of nozzles arranged on the plurality of chips. The printing apparatus discharges ink from a predetermined number of successive nozzles on each nozzle array of each chip toward a printing medium during conveyance, thereby forming a plurality of first patterns corresponding to at least one nozzle array of each chip on the printing medium in the nozzle arrayed direction, reads the plurality of first patterns from the printing medium during conveyance using a sensor, calculates the shift amount of an ink attached position based on the plurality of read first patterns and corrects the attached position of ink based on the shift amount.

The invention relates to an entire deformation detection system of a subway tunnel and belongs to the field of a tunnel engineering monitoring technology. The system integrally comprises a plurality of instrument stations distributed on the inner wall of a tunnel and stop-level monitoring systems in tunnel stops, image acquisition terminals in all the instrument stations are connected into a network through an RS485 bus and connected with monitoring computers in the stop-level monitoring systems, so that coordinate displacement change information of adjacent instrument stations, which is acquired and processed by the image acquisition terminals, can be sent to the stop-level monitoring systems and tunnel deformation conditions between two stops are summarized and analyzed by the monitoring computers integrally. In the invention, a network sensor technology and an image identification technology are used for the online real-time deformation monitoring of operating subway tunnels for the first time, the deformation condition of the tunnels can be analyzed according to tunnel deformation data, and disasters caused by serious deformation conditions of the tunnels can be alarmed in time.

A digital temperature sensing system and method for converting a test temperature into a digital output signal are disclosed. The system comprises a temperature-to-time circuit for generating a thermally sensitive time signal of which a width varies with the test temperature; an adjustable time reference circuit for generating a time reference signal of which a width changes with the digital set value; a time comparator for generating a time comparison signal according to a width difference between the thermally sensitive time signal and the time reference signal; a logic control circuit for adjusting the digital set value of the adjustable time reference circuit according to the time comparison signal so that the width of the thermally sensitive time signal and the width of time reference signal are close enough or substantially equal.

The invention discloses a motion type magnetic target locating method based on a vector magnetic gradiometer. The motion type magnetic target locating method comprises the following steps that (1) the structural error of two sets of vector magnetometers forming the vector magnetic gradiometer is compensated so that the signal output of the two sets of vector magnetometers is maintained to be consistent; (3) the vector magnetic gradiometer is enabled to rotate around a vertical axis in a magnetic abnormal space, the magnetic field direction gradient data of the magnetic gradiometer at the rotating azimuth angle are acquired, and magnetic field full tensors are acquired according to the relation between the direction gradient and the azimuth angle; and (3) magnetic target locating is performed by using the magnetic field full tensors. According to the motion type magnetic target locating method, the structural error compensation problem of the vector magnetic gradiometer is solved by using the mode of triaxial coefficient compensation so that the output of the two sets of vector magnetometers forming the magnetic gradiometer is enabled to be correspondingly consistent; and the structural error is eliminated so that high-resolution detection can be realized.

The invention provides a micro-structure resonant beam pressure sensor, comprising an upper silicon slice and a lower silicon slice which are formed by linkage, wherein the upper silicon slice comprises a rectangular frame and two symmetrical peninsulas arranged in the rectangular frame; two groups of resonant beams which are made of titanium nitride and arranged side by side have two ends connected with the two peninsulas respectively; each resonant beam is respectively provided with a lead wire and a excitation resistance and a sensing resistance which are connected with electrodes; the lower silicon slice adopts a structure with an O-shaped frame, in which a pressure film arranged. In the invention, the titanium nitride is used as the resonant beams of the pressure sensor, and the titanium nitride has very high natural resonance frequency, the precision of the resonant type pressure sensor is greatly improved due to the use of the titanium nitride resonant beams. The measuring precision can be improved by increasing the natural resonance frequency, because higher the natural resonance frequency is, the bigger movement the corresponding zero pressure frequency has (the precision of the sensor is the specific value of the frequency instability and the movement of the corresponding zero pressure frequency) , and higher the measuring precision of the pressure is.

The invention discloses an experimental method for measuring unconventional tight gas reservoir spontaneous infiltration absorption relative permeability. The method comprises the following steps of (1) washing and drying a core taken from a tight gas reservoir, and then measuring a diameter D, a length L, and an original porosity phi0; (2) obtaining absolute permeability K0 of the core and an effective pore volume VP; (3) putting the core after saturated formation water into a core holder, adding confining pressure, and raising a temperature to a formation temperature; (4) injecting a nitrogen gas into the core, carrying out replacement and stopping when a water amount of a water metering pipe at a core outlet end is no longer increased; and (5) under a water flooding pressure differencedeltaP, slowly injecting the water into the core holder, carrying out a spontaneous infiltration absorption water gas displacement experiment, calculating water phase relative permeability Krw, gas phase relative permeability Krg and water saturation Sw of the core, and acquiring a gas-water two-phase relative permeability curve of a tight gas reservoir core spontaneous infiltration absorption water gas displacement process. In the invention, a theoretical basis is provided for determination of residual gas saturation of the tight gas reservoir and calculation of reserves.

The invention discloses a drilling detecting integrated system and method for overlying strata fracture detection, and particularly relates to the field of overlying strata fracture development regulation detection under a coal mine well. The invention aims at solving the defects exist in the existing overlying strata fracture detection that excavation, drilling holes and the overlying strata fracture detection can not be conducted simultaneously, a certain measurement error or even hole collapse occurs due to the fact that new cracks occur when the drilling holes are placed for a long time, and whether hole sealing is finished or not and the reliability of the hole sealing can not be verified artificially in the detection process. The drilling detecting integrated system comprises a detection pipe, a drilling device and a control device; the upper portion of a rod body of the detection pipe is sleeved with a hole sealing capsule, the two ends of the hole sealing capsule are fixed through upper convex plates and lower convex plates which are located on the detection pipe respectively, an electric three-way ball valve is arranged inside the hole sealing capsule, and a groove is formed in the portion, at the lower portion of one convex plate, of the rod body of the detection pipe.

The invention discloses a method for measuring shrinkage factor of PDP (Plasma Display Panel) glass. The method comprises the following steps: step 1, marking out a measuring line on a PDP glass sampler sheet, and cutting the PDP glass sampler wafer into a reference sheet and a measuring sheet, wherein the cutting line cuts the measuring line; step 2, vertically placing the measuring sheet, arranging porcelain boats on the top and the bottom of the measuring sheet respectively, sealing and surrounding the measuring sheet, and filling flexible high-temperature resistant materials between the upper and the lower ends of the measuring sheet and the inner walls of the porcelain boats and between the side edge of the measuring sheet and the inner walls of the porcelain boats; step 3, heating the porcelain boats and the measuring sheet according to a preset heating curve in an integrated manner; step 4, carrying out annealing cooling to the measuring sheet after heating, comparing the displacement of the measuring line of the measuring reference sheet and the measuring sheet and calculating the shrinkage factor. The method for measuring the shrinkage factor of PDP glass can solve the problem of non-uniform heating and enables the whole piece of glass to be in a stable temperature environment during glass heat treatment to achieve uniform heat shrinkage effect, and furthermore, the measured shrinkage factor data is accurate and reliable.

A thermal type flow sensor includes a base portion provided along the direction of a fluid flowing through a main passage, and a sensor element mounted on the base portion and having an exothermic resistor formed on a substrate for detecting the fluid flow rate. The base portion has a rectangular recessed portion in which the sensor element fixed so that the surface of the detecting portion of the sensor element is positioned lower than an upper edge of the recessed portion. A wall portion of the measuring passage facing the sensor element is constricted. The exothermic resistor is disposed along the fluid passage and spaced away from the upstream side upper edge of the recessed portion and cannot be substantially affected by a fluid flow disturbance due to a step portion formed between the upper edge of the recessed portion and the detecting portion surface.

The invention provides a noninvasive and continuous blood pressure monitoring method and device based on pulse wave propagation time. The noninvasive and continuous blood pressure monitoring method and device are characterized in that standard II-lead ECG signals of a testee is detected through an electrocardiosignal detection unit under three body positions, including the body positions generated when the testee lies on his/her back, stands with arms vertically lifted and stoops, meanwhile PPG signals at the ends of index fingers are detected through a volume pulse wave signal detection unit, the time difference between the wave peak value point R of the ECG signals and the characteristic point of the PPG signals is measured through an upper computer signal processing unit and serves as the pulse wave propagation time PTT, correlation analysis and linear-regression analysis are conducted on the obtained PTT data and blood data recorded by an electronic sphygmomanometer, a regression equation of the PTT to blood pressure is established, and the blood pressure value is obtained indirectly by measuring the PTT. By means of the noninvasive and continuous blood pressure monitoring method and device, accuracy of continuous blood pressure detection and comfort of the testee can be effectively improved, long-term noninvasive and continuous blood pressure measuring can be achieved, portability of the device is high, great convenience is brought to examination operation, and real-time detection of the blood pressure value is achieved easily.

The invention discloses a detecting and straightening machine and method for shaft parts. The detecting and straightening machine comprises a console and a straightening machine body. The straightening machine body comprises a fixed work table and a movable main machine frame. The movable main machine frame can move on the fixed work table along the X axis and can feed data back to the console. A straightening hydraulic cylinder is arranged on the movable main machine frame and can straighten a workpiece. A rear bracket capable of moving along the Y axis is arranged on the rear side of the movable main machine frame. A measurement hydraulic cylinder is arranged on the rear bracket. A measurement rolling wheel is arranged below the measurement hydraulic cylinder. A displacement sensor for measuring the Y-axis movement amount and a displacement sensor for measuring the Z-axis movement amount are arranged on the movable main machine frame and the measurement hydraulic cylinder correspondingly. The displacement sensors can transmit information to the console. Detecting and straightening of the workpiece can be conducted on the same device and the same station through the same installation reference. When straightness detection is conducted on the workpiece, detection can be conducted on the workpiece on three-dimensional scale, and measurement errors are reduced.

The invention discloses an in-service bolt axial force detection method, a detection system and a detection device. The detection method comprises steps: the bolt diameter of a bolt sample, a thread diameter, a sound velocity before force, a nut axial length, a screw rod length, a bolt force bearing area length, actually-measured axial forces of the bolt sample under different loads, ultrasonic transit time corresponding to the actually-measured axial force, and an ultrasonic transit time-axial force model are acquired; according to the bolt diameter, the thread diameter, the sound velocity before force, the nut axial length, the screw rod length, each actually-measured axial force, the ultrasonic transit time and the ultrasonic transit time-axial force model, a soft measurement expressionis determined; and by adopting the soft measurement expression, the axial force of the to-be-detected in-service bolt is calculated. The detection method provided in the invention not only takes intoaccount the influences of material constants of the bolt on the bolt axial force, but also takes into account influences of the length of the nut force bearing area and a nut force bearing area internal axis normal stress factor on the bolt axial force, the axial force of the in-service bolt can be effectively measured, the measurement errors are small, and the precision is high.

A posture monitoring system includes one or more contact sensors that are used to map contact or pressure points of a person's body and produce output signals representative of the person's posture. The contact sensors are embedded within a pad, a cushion, an article of furniture or are integrated into a wearable clothing article. In accordance with the embodiments of the invention, a contact sensor is formed by depositing at least one set of flex sensors on opposite sides of a flexible substrate and electrically coupling the opposed set of flex sensors to provide a voltage bridge that cancels noise and to provide a contact sensor that measures both concave and convex changes in curvature.

A spectrum manager manages a secondary system that shares a frequency with a primary system. A communication unit receives a measurement value of reception power of a signal of the secondary system which is measured by a monitoring station, and holds the measurement value in a measurement result storage unit. A path loss estimating unit estimates a path loss at a first frequency, and a path loss correcting unit performs actual measurement correction on a path loss estimation value using one of a reception power measurement value of a radio signal of a secondary transmitting station measured at a second frequency different from the first frequency and a reception power measurement value of the radio signal of the secondary transmitting station measured in a period of time which is not used by the primary system. A permissible transmission power setting unit calculates permissible transmission power of the secondary transmitting station using the path loss estimation value which has been actually measured and corrected.

The invention provides a detection method of chemical oxygen demand, comprising the steps that: the extinction of sewage samples to be detected on a plurality of wavebands to be detected is measured; the extinction is integrated on each waveband to be detected by using the wavelength as integral variable; the integral values A<jf1> to A<jf1n>of the extinction of the sewage samples to be detected on each waveband to be detected are calculated; the integral values are substituted into a formula as follows so as to work out that COD: COD is equal to k1 multiplied by A<jf1 > plus k2 multiplied by A<jf2> ellipsis plus k<n> multiplied by A<jfn>; wherein, k1 to k<n> are the linear relative coefficients of the integral values of the extinction corresponding to each waveband to be detected as well as the COD; n is the number of the waveband to be detected. The technical proposal of the invention indicates that the ultraviolet measurement method of the invention adopting multi-wavelength leads the measurement result to exactly reflect the COD value in comparatively large application range and reduces the measurement errors.

The invention discloses an all-in-one machine with video velocity measurement and vehicle license plate recognition, and relates to the field of road traffic equipment. An embedded DSP (digital signal processor) is connected with an embedded DSP vehicle license recognition controller, a signal acquiring processing storage equipment is connected with the embedded DSP vehicle license recognition controller, a camera device is connected with the embedded DSP video velocity measurement controller, a light-compensating is connected with the embedded DSP video velocity controller, a mobile power supply equipment is respectively connected with the embedded DSP video velocity controller, the embedded DSP vehicle license recognition controller and the camera device. The all-in-one machine is mainly used for mobile illegal capture or a vehicle-mounted velocity monitoring system, and integrated with the functions of vehicle license recognition, velocity detection, vehicle information search, illegal search, illegal record and storage, and has the advantages of good in environment suitability, vibration-resisting, strong in self-adaptivity, low in cost, and high in measurement precision.

This invention relates generally to systems for the internal fixation of bone fractures, and particularly, to equipment associated with the insertion of intramedullary fracture fixation devices such as those used in the treatment of long bone fractures, such as for example fractures of the femur, tibia, humerus, etc. An implant assembly device of the present invention may comprise a handle, a shaft with a first end and a second end, and an elongated rod extending from the shaft. The first end of the shaft is connected to the handle and the second end of the shaft is configured to engage the head of a connecting screw. The device can be held with one hand while the various components are placed one by one into their proper position onto the rod, leaving the other hand free to manipulate the other components.

A method for digitally simulate pre-assembling construction of steel structure bridge includes detecting segment pre-assembly of steel structure beam segment and digital-analog pre-assembly of bridge,The method comprises the following steps: step a1: establishing an overall model of a steel structure bridge according to design data; step a2: extracting a segmented model and establishing a coordinate system; step a3: determining a control point of the segmented size and a coordinate value of the control point in the model, which relates to the technical field of construction. A digital analogpre-assembling construction method for steel structure bridges so that the total station can be used for measuring by simulating pre-assembling, the control points in the solid assembly are detected during the detection of a single component, including all the control points between adjacent components. The computer is used to process the data, and the coordinate value comparison and three-dimensional model fitting of the pre-assembled components are carried out at the same time.

The invention discloses a wireless measuring system and measuring method for a multi-node resonant surface acoustic wave sensor. The wireless measuring system is characterized in that corresponding tothe frequency band of each resonant surface acoustic wave sensor, a reader transmitting circuit transmits excitation signals of multiple frequency bands at the same time through a plurality of localoscillation sources to simultaneously measure the resonance frequencies of a plurality of sensors. Moreover, a reader receiving circuit directly performs the band-pass sampling on the amplified and filtered radio frequency echo signals, and then performs frequency-domain interpolation on the Fourier-transformed echo spectrum information. Compared with the conventional reader that measures the resonant frequency of each sensor with a single local oscillation source by polling, the measurement real-timeness is greatly improved, and the measurement precision is improved by a frequency-domain interpolation method. Besides, because the reader receiving circuit adopts the direct band-pass sampling method of the radio frequency signal, the down-conversion circuit is not needed, not only the structure is simple and the cost is low, but also the signal-to-noise ratio is improved.

An optical measuring device according to the present invention includes: a plane mirror (3), which has a central opening that functions as either a light entering window or a light source fitting hole (5) and an observation window 6′ that enables a photodetector (6) to take measurements; and an integrating hemisphere (2), which has its center of radius of curvature defined within the central opening of the plane mirror (3) and of which the inner wall surface functions as a light diffuse reflective surface (1). The plane mirror (3) and the integrating hemisphere (2) form an integrating space inside.

The invention relates to a compound swing bar without twist. It takes the structure of three-lay composite sandwich, and the aperture of middle layer is less than that of outer, which thickness is 0.2~0.3 mm in control. So that the line contact between hole on the rocker and top edge of the prism is changed into the point contact on the midpoint of hole to make the rocker hang in a vertical state, eliminate twisting, save time and reduce measure error and cost.

The invention relates to a device for maintaining the stability of the polarization direction and energy of optical signals with low repetition frequency and short pulse. The device comprises a continuous optical fiber laser, an optical pulse generator, a polarization control unit, an analyzer, an optical fiber beam splitter, a feedback unit, a digital controller and a signal synchronizer, wherein the polarization control unit comprises a polarization control module and a driving circuit thereof; the driving circuit supplies driving voltage to the polarization control module; and the feedback unit successively comprises a photoelectric detector, an integrating circuit, a high-speed electric amplifier and a high-speed acquisition card. The device of the invention can maintain the stability of the polarization direction and output energy of the optical signals with low repetition frequency and short pulse, and has simple structure, ensures accurate control, is easy for system integration and the like.

The invention provides a temperature measuring device used for measuring the temperature of a to-be-measured object (3). The temperature measuring device comprises a vacuum box (11), a radiation heating box (13), a power supply (21) and a temperature data acquisition unit (23), wherein the radiation heating box (13) is positioned in the vacuum box (11); an electrically heated wire is arranged on the outer surface of the radiation heating box (13); the to-be-measured object (3) is arranged in the center of the radiation heating box (13); the power supply (21) is used for heating the radiation heating box (13); the temperature data acquisition unit (23) comprises multiple thermocouples; part of the multiple thermocouples are arranged on each surface of the to-be-measured object (3); and theother part of the multiple thermocouples are arranged on the surface of the radiation heating box (13). In addition, the invention further provides a method for measuring specific heat capacity and thermal conductivity based on the temperature measuring device.