82results about How to "Difficult to measure" patented technology

A portable articulated arm coordinate measurement device is provided. The coordinate measurement device includes a base and an articulated arm portion having at least one arm segment. A biasing member is coupled on a first end to the base and on a second end to the articulated arm portion. The first end of the biasing member is movable between a first position and a second position. An adjuster is coupled between the base and the biasing member. The adjuster is coupled to move the first end of the biasing member from the first position to the second position.

The present invention relates to an anklebone healing robot, which comprises a mechanical part, a control part and a display part. The mechanical part comprises a pedestal and a movable platform. Three fork chains with the same structure and a central restricting rod with a central spherical pair are uniformly distributed and arranged between the pedestal and the movable platform in parallel. Each fork chain consists of a rotating pair, a lower spherical pair, a connecting rod and an upper spherical pair. The upper end of the central restricting rod is connected with the center of the movable platform by a spherical hinge. Three pieces of same bent plates are uniformly distributed and fixedly arranged at the pedestal. Three moment motors with same specification are respectively arranged at the three bent plates and are respectively in driving connection with the rotating pairs of the three fork chains. The movable platform is equipped with a footplate. A three-dimensional or six-dimensional force / moment sensor is arranged between the movable platform and the footplate. A shaft of the rotating pair is equipped with a position sensor. The control part comprises a computer and corresponding software, a multi-spindle movement control card and a driver. The software comprises a healing software realizing the interaction with the patient, and the healing software comprises three subsystems of healing exercise, information feedback and function evaluation.

Some embodiments of the present invention provide methods and apparatuses for improving the performance and utility of breath alcohol measurements through the use of multivariate spectroscopy. In some embodiments, the spectroscopic breath measurement can be combined with multivariate spectroscopic tissue alcohol and / or tissue biometric measurements in order to overcome the limitations encountered by existing breath alcohol measurement devices.

A hybrid calibration method uses an calibration phantom (exterior reference) scanned simultaneously with the patient, and one or more known tissues of the subject (interior reference) to create a hybrid calibration reference that improves the measurement of tissue densities throughout the body. In addition, the calibration method is used to quantitatively define boundaries of tissue and organs for more accurate measurements of lengths, areas and volumes. Another aspect of the invention uses the calibrated images to quantitatively preset absolute window / levels for filming and image display, which provides standardized viewing for diagnostic purposes.

A bottom hole assembly (BHA), adapted to be positioned in a casing and to isolate a portion of a wellbore, which includes a packer assembly with a first sealing element extending between first and second portions of the packer assembly. A method of setting a BHA in a casing which includes increasing a BHA pressure to activate an anchor assembly, applying a mechanical force to mechanically deform a first sealing element to thereby establish an initial seal between the first sealing element and an interior surface of the casing, and increasing a pressure in a space between the BHA and the casing and in a cavity within the BHA to increase a differential pressure across the first sealing element and thereby establish a pressure-energized seal between the first sealing element and the interior surface of the casing.

A hybrid calibration method uses a calibration phantom (exterior reference) scanned simultaneously with the patient, and one or more known tissues of the subject (interior reference) to create a hybrid calibration reference that improves the measurement of tissue densities throughout the body. In addition, the calibration method is used to quantitatively define boundaries of tissue and organs for more accurate measurements of lengths, areas and volumes. Another aspect of the invention uses the calibrated images to quantitatively preset absolute window / levels for filming and image display, which provides standardized viewing for diagnostic purposes.

A portable articulated arm coordinate measurement device is provided. The coordinate measurement device includes a base and an articulated arm portion having at least one arm segment. A biasing member is coupled on a first end to the base and on a second end to the articulated arm portion. The first end of the biasing member is movable between a first position and a second position. An adjuster is coupled between the base and the biasing member. The adjuster is coupled to move the first end of the biasing member from the first position to the second position.

The invention provides a calibration method and calibration system for the amplitude phase error of a satellite-borne DBF (Digit Beam Forming) transmitting channel. The calibration method and the calibration system respectively comprise two levels of calibration schemes, and the two levels of calibration schemes are composed of output Butler front-end channel part amplitude phase calibration and output Butler rear-end channel part amplitude phase calibration. The method comprises the following steps of: firstly, injecting a calibration signal after inputting the Butler, and coupling the calibration signal at a test port which transmits the Butler, thereby realizing the calibration of a frequency mixer and a power amplifier; and then, keeping the original calibration signal injection mode, and receiving the calibration signal through a far field, thereby realizing the calibration of a filter and a feed source array. Through the method and system provided by the invention, the measurement accuracy of the amplitude phase error is improved greatly, so that the method and the system can be used for effective loads of communication satellites, detection satellites and navigation satellites, and also can be used in the technical fields of ground radars and the like.

A body 1 placed thereon with a table 35 put thereon with an object to be measured W, and a portal frame 41 supporting both ends of rail 43 to the body through pillars 42A and 42B, the rail being placed above the table 35 and extending along a moving direction of a pair of probes 91A and 91B, are provided. A pair of sliders 51A and 51B are movably supported by the rail 43. The pair of the probes are extended downward from the sliders 51A and 51B to be abutted to the object W put on the table 35. The flexural deformation of the probes 91A and 91B is decreased due to the shorter length of the probes 91A and 91B, so that the high accurate measurement is achieved and a relative measurement is omitted.

A method of relocating a portable articulated arm coordinate measuring machine (AACMM) from a first location to a second location, wherein the AACMM has, at the first location, a first origin point and a first frame of reference and, at the second location, a second origin point and a second frame of reference, the method including the steps of: measuring an amount of tilt of the portable AACMM along two perpendicular directions, each of which are approximately perpendicular to a gravity vector, with the portable AACMM in each of the first and second locations; measuring a first target and a second target with the portable AACMM in the first location to obtain, in the first frame of reference, a first set of x, y, and z coordinates and a second set of x, y, and z coordinates; measuring the first target and the second target with the portable AACMM in the second location to obtain, in the second frame of reference, a third set of x, y, and z coordinates and a fourth set of x, y, and z coordinates; and finding x, y, and z coordinates of the second origin point with respect to the first frame of reference, wherein the x, y, and z coordinates of the second origin point are found using the first, second, third, and fourth sets of x, y, and z coordinates but without using additional x, y, and z coordinates of a third target measured with the AACMM at the first location and at the second location.

The invention discloses a double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method. The method is based on the principle that the impedance of a residual normal winding where a fault exists is reduced during inter-turn short-circuit of a coil, that is, when a motor works under a double-redundancy operation mode, if the inter-turn short-circuit happens to the coil, the equivalent resistance and inductance parameters in a Park equation of a winding where the fault exists have certain reduction, and currents of the two windings are basically the same, so that direct-axis voltages of the two windings have a certain deviation. By means of the plus or minus average value and the absolute value of the difference between the direct-axis given voltages of the two windings of first several DSPs in each PWM sampling control period, and motor operation state judgment made through the rotation direction of a motor permanent magnet rotor and the plusor minus quadrature-axis given current, to which three-phase winding the coil inter-turn short-circuit fault happens is online diagnosed between different phases of windings under the double-redundancy operation mode of an electromagnetic-coupling-free low-thermal coupling double-redundancy permanent magnet synchronous motor.

The present invention belongs to the field of electric power transmission, and is especially live detection method of synthetic insulator fault and zero value insulator in high voltage DC power transmission line. The detection method includes the steps of: detecting the AC harmonic electric field distribution around the insulator; comparing with standard electric field distribution; and judging whether the insulator is normal or in fault based on whether to have obvious difference between the two distributions. The present invention facilitates the detection of insulator in high voltage DC power transmission line with voltage level as high as 500 KV and has relatively high sensitivity.

Disclosed is a method and apparatus for measurement of the derivative of acceleration with respect to time (jerk) and the use of demodulation to analyze the jerk signal. The sensor used to measure jerk consists of a piezoelectric transducer coupled with an amplifier that produces a voltage or current signal that is proportionate to jerk. In applications including rolling element bearing diagnostics, demodulation is used to measure changes in the jerk signal over time.

A thermal conductivity measurement apparatus for measuring a thermal conductivity of a one-dimensional material includes a substrate, a vacuum chamber receiving the substrate and four spaced electrodes. The one-dimensional material spans across the four spaced electrodes. A middle part of the one-dimensional material, located between the second and third electrodes, is suspended. The present disclosure further provides a method for measuring the thermal conductivity of the one-dimensional material.

The invention provides an analysis method for impurity elements in tin-oxide-containing nanopowder, and aims to solve the problem that the tin-oxide-containing nanopowder is not easy to decompose by adopting an inductive coupling plasma atomic emission spectroscopy method and selecting the reagent type, dosage and method adopted for the dissolving sample of the tin-oxide-containing nanopowder; experiment interference is eliminated by selecting acid conditions and instrument parameters, thereby solving the difficulties that tin and antimony are easy to hydrolyze, interference elements are more and difficult to test and test background value is high and the like; with the method, the detection limit is below 0.003%, the relative standard deviation is within 10%, the method correlation coefficient is above 0.998, and the recovery rate is between 85% and 130%; and the analysis speed is high, the data is accurate, the errors meet conventional requirements, and the quality and the performance stability of the tin-oxide-containing nanopowder can be ensured.

The invention relates to a method and a device for inspection measurement of a fan-shaped section base of a continuous casting machine. The method comprises the following steps of putting a false axis into a U-shaped base for positioning, measuring arc fan-shaped sections and straight fan-shaped sections by measuring parameters such as false axis elevation, and measuring the fan-shaped section base by the device, wherein in the measurement, error compensation is carried out. The device can simulate the fan-shaped sections. The method is easy, is convenient for operation, realizes accurate and fast measurement, and shortens a construction period. According to the method, in positioning U-shaped base 5 measurement adjustment of the first arc fan-shaped section, a reference-point casting machine tangent point line is needed; and in positioning U-shaped base measurement adjustment of other fan-shaped sections, only an inside micrometer, a level instrument and an indium steel rule are needed so that the reference-point casting machine tangent point line use is avoided in the positioning U-shaped base measurement adjustment of other fan-shaped sections.

Provided are a method of analyzing a target substance to be measured, the method including: dividing a surface of a measuring unit of a CMOS image sensor into a plurality of pixels, directly fixing a bioreceptor onto the surface of the measuring unit of the CMOS image sensor, and measuring chemiluminescent signals depending on concentrations of the target substance to be measured, and a CMOS image sensor applied to the same.

The invention discloses a traveling-wave tube internal temperature soft-measurement method based on a finite element model. With multi-point temperature values of the shell of a traveling-wave tube as auxiliary variables, the finite element soft-measurement thermal model of the traveling-wave tube is created; with heat source distribution as independent variables, a target function of an error sum of squares between the multi-point temperature measurement values of the shell and corresponding point temperature simulation values of the finite element thermal model of the traveling-wave tube is derived, and is solved by an iterative algorithm, so that an optimal heat source distribution solution is obtained, finally, the optimal heat source distribution solution is loaded into the finite element thermal model of the traveling-wave tube, and an internal temperature soft-measurement value of the traveling-wave tube is obtained by finite element stimulation calculation. The traveling-wave tube internal temperature soft-measurement method based on the finite element model breaks through the limitation of conventional detection, and prevents a series of complex problems brought about by temperature sensors placed in traveling-wave tubes, measurement is convenient, the implementation cost is low, and the traveling-wave tube internal temperature soft-measurement method based on the finite element model can be applied in the mass testing of traveling-wave tubes.

The present invention relates to fluorescent or luminescent probe reagents for measuring oxidative stress in a cell or an organism. Examples of the probe reagents include: a fluorescent or luminescent protein and a marker protein; a fluorescent or luminescent protein, a marker protein, and a regulatory factor; or a fluorescent or luminescent protein, a marker protein, a cleavage sequence, and a regulatory factor. In the probe reagents, the marker protein makes it possible to detect the oxidative stress caused by reactive oxygen species and comprises a regulatory factor-binding site and a ubiquitin-binding site; and the regulatory factor is a protein making it possible to regulate degradation of the marker protein in response to the reactive oxygen species. The present invention also relates to a method of measuring oxidative stress in a cell or an organism, or a method of screening a substance which suppresses or promotes the oxidative stress in a cell or an organism by using the probe reagent.

The invention discloses a method for measuring the shrinking percentage of an inner cavity of a hollow casting. The method is applied to measurement on the size change of the inner cavity of the blade in a manufacturing process of an air-cooling blade, aiming at solving the problem that the size change of the inner cavity of the blade cannot be measured in the prior art. The method comprises the following steps: firstly, designing an analog sample piece of the hollow casting, secondly, designing a core mold and an outer mold of the analog sample piece, and subsequently manufacturing the analog sample piece according to the manufacturing process of the blade, wherein quality control requirement on the analog sample piece is consistent with that on a real casting; after reinforcement at high temperature, measuring the three-dimensional sizes of a core of the prepared analog sample piece; and subsequently, reinforcing at low temperature, manufacturing a wax mold, manufacturing a molding shell, casting, cooling down and subsequently cutting the analog sample piece according to measurement lines, measuring the inner cavity of the casting, and finally measuring and calculating the shrinkage percentage. By adopting the method, the precision of the size of the inner cavity of a turbine blade is ensured, and the pass percent of the casting is increased.

A system for ultrasensitive mass and / or force detection of this invention includes a mechanical oscillator driven to oscillate in a nonlinear regime. The mechanical oscillator includes a piezoelectric base with at least one cantilever resonator etched into the piezoelectric base. The cantilever resonator is preferably a nonlinear resonator which is driven to oscillate with a frequency and an amplitude. The system of this invention detects an amplitude collapse of the cantilever resonator at a bifurcation frequency as the cantilever resonator stimulated over a frequency range. As mass and / or force is introduced to the cantilever resonator, the bifurcation frequency shifts along a frequency axis in proportion to the added mass.

A sheet pressure sensor includes a first fiber layer, a second fiber layer, and a third fiber layer provided between the first and second fiber layers. The third fiber layer has connecting yarns that electrically connect first conductive portions of the first fiber layer and the second conductive portion in the second fiber layer with a predetermined electric resistivity. The sheet pressure sensor further includes a measuring instrument for measuring electric resistance between at least one of the first conductive portions and the second conductive portion. The connecting yarns unstrain due to deformation of the first or second conductive portion which is generated by applied pressure, and then are short-circuited with one of them. The sheet pressure sensor can detect the pressure while keeping air ventilation characteristic by giving a pressure detection function to the fiber layers.

The invention discloses a method and system for detecting an abnormal battery in a lithium battery pack, and belongs to the technical field of lithium battery pack life prediction and estimation, and the method comprises the following steps: S1, detecting the terminal voltage, the temperature and a charge state of each lithium battery in the lithium battery pack at the current moment, wherein the terminal voltage and temperature of each lithium battery in the lithium battery pack form an abnormal characterization characteristic of the lithium battery pack, and the charge state of the lithium battery and the terminal voltage or temperature form an attenuation characteristic of the lithium battery; s2, inputting the obtained abnormal characterization characteristics of the lithium battery pack into a pre-trained abnormal battery judgment model, and identifying the positions of all abnormal batteries in the lithium battery pack; and s3, respectively inputting the attenuation characteristics of each abnormal battery into a pre-trained attenuation rate estimation model to obtain the attenuation rate of each abnormal battery. According to the invention, fine detection of abnormal batteries in the lithium battery pack is realized, more careful and in-place monitoring and management can be provided for the lithium battery pack, and faults in the lithium battery pack are effectively prevented.

The invention relates to a method for high precision compensation of vertical angles of electronic total stations and electronic theodolites with angle compensation. A mathematical model for high precision compensation of vertical angles is provided; electronic levelers are disposed respectively in directions parallel to a transverse axis and a collimation axis of a theodolite; an inclined angle of a vertical axis of the theodolite is characterized by inclined angles in directions of the transverse axis and the collimation axis of the theodolite; the inclined angles in directions of the transverse axis and the collimation axis are the measured output of the electronic levelers in corresponding directions, and are used as matrix elements to establish an initial matrix when the vertical axis of the theodolite is inclined; the rotation process during the angle measurement of the theodolite is represented by a corresponding matrix; and finally a real measuring model value of the theodolite vertical angle is obtained in the presence of vertical axis inclination errors. Compared with the prior art, the invention has the advantage that a precise mathematical model established by coordinate transformation is provided, and the new model is used in the high precision measurement of theodolite vertical angles; therefore the compensation precision is higher, and the error compensation scope is larger; and the method is easy to carry out.

A downhole acoustic logging tool uses a phased-array of transmitters and / or receivers to improve the signal level of compressional waves generated by the transmitters and propagating in the formation. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

The invention provides a method for measuring roundness of a large cylinder. The method comprises the following steps: 1) determining the position of a central axis of a cylinder, establishing a coordinate system with the central axis of the cylinder being an axis, and calibrating coordinates of cylinder center datum mark points on the cylinder through a datum transformation method; 2) setting cylinder roundness measurement control points and carrying out measurement; and 3) establishing a cylinder roundness measurement local area network and measuring the roundness of the cylinder. An absolute laser tracker is introduced, so that under the condition of narrow and small space and hard datum point measurement, the roundness of super-large cylinders, such as a hydro-generator rotor and a stator, can be measured, and measurement accuracy and reliability are improved.

The invention relates to a high-precision compensation method for a horizontal angle of an electronic total station, an electronic theodolite and the like with angle compensation. The method comprises the following steps of: providing a high-precision compensation mathematical model for the horizontal angle; arranging two electronic levels in directions parallel to a horizontal axis and a collimation axis of the theodolite respectively; characterizing an inclination angle of a vertical axis of the theodolite by inclination angles in the horizontal axis direction and the collimation axis direction of the theodolite, wherein the inclination angles in the horizontal axis direction and the collimation axis direction are measurement outputs of the electronic levels in corresponding directions,and are used as matrix elements to establish an initial matrix when the vertical axis of the theodolite is inclined; and representing the rotating process of a measured angle of the theodolite by using the corresponding matrix; and finally obtain a real measurement model value of the horizontal angle of the theodolite when an error of the vertical axis inclination exists. Compared with the prior art, the invention provides the precise mathematical model established through coordinate transformation, and the new model is applied to the high-precision measurement of the horizontal angle of the theodolite, so that the compensation precision is higher, the error compensation range is wider, and the method is easy to implement.

A biological sample solution is ionized by electrospray and the sample solution is irradiated with an infrared laser beam to dissociate biological macromolecules into the constituents thereof. As a result, only non-covalent bonds of the biological macromolecules can be selectively severed and analyzed.

Provided herein are nucleic acid-based nanoswitches that can detect specific nucleic acids and other analytes types by for example a simple gel electrophoresis readout. Binding of the target to the nanoswitches induces a conformation change from a linear, open conformation to a looped, closed conformation. These nanoswitches may be used in diagnostic assays such as nucleic acid-based diagnostic assays, to detect, measure and / or purify a variety of targets including low abundance targets.