458results about How to "Easy and accurate measurement" patented technology

The invention discloses multichannel radar amplitude and phase automatic correcting method and device. The method comprises the following steps of: before a radar system works, respectively feeding the same radio frequency test signal into various receiving channels of a multichannel radar system by a feed source to obtain the phase characteristic and the amplitude characteristic of various receiving channels; calculating a phase difference and an amplitude specific value between other channel signals and a reference signal by using one of channel signals as a reference signal; and then enabling the radar system to work, carrying out automatic correction on target echoes of all the channels by utilizing the obtained phase difference and the amplitude specific value so as to ensure the consistency of all the channels on amplitudes and phases. When a transmission frequency point is changed or a radar working environment is changed, the amplitude and phase characteristics of the receiving channels are unavoidably changed; and the invention can accurately and conveniently measure and correct the change of the amplitude and phase characteristic and ensure the consistency of all the channels, thereby expanding the working frequency range and the environmental adaptability of radar and improving the maintainability of the radar.

An extracorporeal blood chamber for an optical blood monitoring system includes an opaque chamber body in order to prevent inaccuracies when measuring oxygen saturation levels due to light ducting, which can occur at low oxygen saturation levels and low hematocrit levels. In one embodiment, the blood chamber need not include a moat as is present in conventional blood chambers.

Embodiments of the invention provide amperometric analyte sensors having optimized elements such as electrodes formed from sputtered platinum compositions as well as layers of material selected to optimize the characteristics of a wide variety of sensor elements and sensors. While embodiments of the innovation can be used in a variety of contexts, typical embodiments of the invention include glucose sensors used in the management of diabetes.

The invention provides a capacitance measurement method for a power distribution network with a neutral point grounded through an arc suppression coil and a measurement device based on the method. The measurement method comprises the following steps of: (1) applying an excitation source, and injecting an excitation signal with the frequency between f0 and 2f0 (assuming the working frequency of the power distribution network as f0) into the power network through a secondary coil of the arc suppression coil, and assuming the frequency of the excitation signal as fc; (2) measuring the current, and measuring an output signal of a zero sequence current mutual inductor to obtain current magnitude; (3) measuring the voltage, and measuring voltage magnitude through a bus voltage transformer; and (4) calculating the capacitive reactance over the ground. The measuring device comprises a signal injecting module, and a bus voltage acquisition and processing module and a zero sequence current acquisition and processing module; the zero sequence current acquisition and processing module comprises a signal processing module electrically connected with an output end of the zero sequence current transformer. The measuring method can be used for conveniently and accurately measuring the capacitive reactance over the ground and the current, and the operations of an operator to the primary side of the power network are avoided.

The invention discloses a measuring method and device for transmittance of an optical element. The method comprises the steps of splitting a laser beam with a specific wavelength to obtain two beams of laser, enabling the two beams of laser to pass through a reference light path and a measuring light path respectively, not placing the optical element on the measuring light path, and obtaining energy E1 of the laser beam passing through the reference light path and energy E2 of the laser passing through the measuring light path by measurement; placing the optical element on the measuring light path, and obtaining energy E1' of the laser beam passing through the reference light path and energy E3 of the laser passing through the measuring light path by measurement; and calculating the transmittance T of the optical element according to an equation T=(E1*E3) / (E1'*E2). According to the measuring method and device, Dual light path aplanatism measurement is adopted, the aim of real-time on-line measurement is achieved, influence of light source energy shake on repeatability of measuring results and measurement of the transmittance of a light-transmission lens can be effectively eliminated, and the transmittance of the optical element used for any ultraviolet pulse laser can be measured accurately and conveniently.

An active matrix drive system drives an emissive display device such as an organic light-emitting diode display and is configured to measure sub-pixel current in the emissive display device. One or more power column power lines of the emissive display device are turned off while sub-pixel current is measured. As a result, the sub-pixel current is relative large compared to the background current of the emissive display device, which facilitates accurate measurement of the sub-pixel current.

This invention relates to laser and material performance test using continuous loading long-pulse laser to load a coating or film test subject surface in quasi-stationary state and heat its thin layer (only dozens of nm thick) with laser thermal action and thermal conduction thereafter, to form a temperature field in the subject. When the thermal stress reaches to a certain value on the coating abbesion will heppen to the subject or even warping or scaling due to the difference between coefficient of thermal expansion and the temperature and the feed system makes the subject to do feed movement to form mars on the surfaces. The related laser energy at scaling position at the interface can express the binding strength of the interface to get the binding strength by theory analysis and digital calculation.

Embodiments of the invention provide amperometric analyte sensors having optimized elements such as electrodes formed from sputtered platinum compositions as well as layers of material selected to optimize the characteristics of a wide variety of sensor elements and sensors. While embodiments of the innovation can be used in a variety of contexts, typical embodiments of the invention include glucose sensors used in the management of diabetes.

Disclosed are a method and apparatus for measuring optical fiber asymmetry time delay. The method comprises: an RTU configuring working states of a Master and a Slave at two ends of an optical fiber line; the RTU delivering an instruction to measure a first optical fiber, and a Master side PPU sending a message, recording a sending time stamp t1 and transmitting the sending time stamp t1 to the Slave; a Slave side PPU receiving the message, recording an arrival time stamp t2, and storing the arrival time stamp t2 corresponding to t1; the RTU displaying that measurement for the first optical fiber is completed, preparing to measure a second optical fiber, and swapping the two optical fibers; the RTU delivering an instruction to measure the second optical fiber, and the Master side PPU sending a message, recording a sending time stamp t'1 and transmitting the sending time stamp t'1 to the Slave; the Slave side PPU receiving the message, recording an arrival time stamp t'2, and storing the arrival time stamp t'2 corresponding to t'1; and an ACU calculating an asymmetry time delay compensation value and sending the asymmetry time delay compensation value to the RTU. The present invention is not limited by sites, saves cost and labor, is simple and fast, and has short stabilization time as well as high testing efficiency and precision.

The invention discloses a device for testing a phase change memory unit. The device comprises a signal generator, a measuring module, a conversion connection interface, a probe station, a controller, a unit array interface circuit and a digital oscilloscope, wherein a control signal is applied through the controller; an excitation signal is applied through the signal generator; and direct current I-V characteristics, pulse I-V characteristics, threshold voltage, threshold current, the minimum write pulse amplitude, the minimum write pulse width, the minimum erasing pulse amplitude, the minimum erasing pulse width, data retention time, erasing fatigue testing and other electrical characteristics of the phase change memory unit are tested by acquiring signals through the measuring module or the oscilloscope. By the device, the direct current I-V characteristics, the pulse I-V characteristics, the threshold voltage, the threshold current, amorphous resistance, crystalline resistance, the minimum write pulse amplitude, the minimum write pulse width, the minimum erasing pulse amplitude, the minimum erasing pulse width, the data retention time, the erasing fatigue testing and other electrical characteristics of the phase change memory unit can be accurately measured.

The invention discloses a five-axis linkage machine tool rotation axis geometrical parameter measuring method based on a trigger-type measuring head and belongs to the field of numerical control system and machine tool structure parameter measurement. The method comprises the steps of instrument installation, parameter setting, collision acquisition and RTCP parameter calculation. Through a numerical control system, a measuring head probe is driven to collide with a standard ball and impact point machine tool coordinates are latched; ball center coordinate corresponding to each demonstration point is calculated according to the coordinates; and driving rotating shaft and driven rotating shaft axis direction and space positions are fitted for each standard ball center coordinate through a least square data processing method, and thus RTCP parameters are obtained. The method can finish automatic precise measurement of five-axis linkage machine tool rotation axis geometrical parameters (RTCP parameters), and realize rotation cutting tool central point accuracy control.

An improved emitter tracking system. In aspects of the present teachings, the presence of a desired emitter may be established by a relatively low-power emitter detection module, before images of the emitter and / or its surroundings are captured with a relatively high-power imaging module. Capturing images of the emitter may be synchronized with flashes of the emitter, to increase the signal-to-noise ratio of the captured images.

A compound represented by general formula (I) or (II) or a salt thereof and an agent for measurement of a reactive oxygen comprising said compound or a salt thereof:wherein R1 and R2 independently represent an aryl group which may be substituted, e.g., a phenyl group substituted with an amino group or a hydroxy group, and R3 represents a 2-carboxyphenyl group which may be substituted.

The invention discloses a color stereoscopic calibration object-based unmanned aerial vehicle calibration method and system. The method comprises the steps of putting a color checkerboard stereoscopic calibration object into a to-be-shot scene; shooting an image of the color checkerboard stereoscopic calibration object in at least three different directions by adopting an unmanned aerial vehicle; linearly solving intrinsic parameters of an unmanned aerial vehicle camera by adopting a vanishing point theory according to the shot image of the color checkerboard stereoscopic calibration object; and determining a geometric restriction relationship between the spatial position of the unmanned aerial vehicle camera and the image by adopting a coordinate projection transformation method according to the intrinsic parameters of the unmanned aerial vehicle camera. According to the method and the system, the color checkerboard stereoscopic calibration object is adopted for performing camera calibration, so that accurate measurement is facilitated, the detection precision is high, the placement is facilitated, and the universality is high; and the calibration of the intrinsic parameters of the camera can be finished only by shooting the image of the color checkerboard stereoscopic calibration object in the at least three different directions and obtaining the intrinsic parameters of the unmanned aerial vehicle camera in combination with the vanishing point theory, so that the use is more convenient. The method and the system can be widely applied to the field of computer vision.

The invention provides a method for realizing wave-shape fluorescent display effect by a multiple-channel digital oscilloscope, which can be realized by a programmable logic device. The programmable logic device comprises a wave-shape data buffer area, an analogue fluorescent screen memory, a wave-shape superposition treatment module, a wave-shape blanking treatment module and a color conversion treatment module. The length and the height of the analogue fluorescent screen memory are respectively L and W. Each memorizing unit of the analogue fluorescent screen memory consists of strength value W and priority signal n, wherein the range of the strength value W is greater than or equal to 0 and smaller than or equal to W; M is decided by the level width of the strength value in the analogue fluorescent screen memory and is the maximum value represented by the level width of the strength value; the priority sequence is sequentially from a network grid, a newly opened channel, a channel 1, a channel 2 to a channel I, and the like until a channel N. The method integrally saves the luminance level information displayed by multiple channels and achieves the fluorescent display effect of analogue oscilloscopes.

The invention relates to a Hall-effect tester of strong magnetic field, wherein said device is formed by extending sheet, electromagnet group, constant-current source, polarity control circuit, controllable stable voltage source, testing circuit, computer, three-phase alternative-current source, and temperature controller. And said testing method comprises: (1), making the extending sheet into electrode, and connecting the wires; (2), connecting three-phase alternative-current source, operating the computer control program, based on the program demand, inputting each parameter; (3), testing relative parameters in new balance temperature, when changing the sample condition temperature; (4), storing or printing the measure result.

The invention discloses an LED junction temperature or average LED array junction temperature measuring method. A formula is established for the LED junction temperature, the effect of the self-heating process of an LED light source generated by a low current on the junction temperature is small, the thermal resistance between a thermostat and the LED light source is small, and the temperature of the thermostat replaces the LED junction temperature. Centroid wavelengths under different thermostat temperatures are measured, and the relational expression between the centroid wavelengths and the junction temperature is established. The junction temperature of an LED under the work condition can be conveniently worked out according to the formula and the centroid wavelengths of the LED light source under the measuring working conditions. According to the method, single-time calibration and multi-time measurement are achieved. Operation is easy, and the steps of the measuring method are similar to the steps of a peak wavelength method and a blue and white comparing method. Only a conventional optical and electrical test device is needed. The repeatability of the measurement on the centroid wavelengths is high, and the centroid wavelengths are used for representing that the junction temperature error is small. An LED pin is not in contact. The method can be used for measuring the junction temperature of a single LED and can be used for measuring the average junction temperature of an array composed of a plurality of LEDs, and the application range is wide.

A heater for a window of an optical gas sensor is provided. The heater may be positioned over a portion of the window or may form at least a portion of the window. Alternatively, the heater may be separate from the optical gas sensor and positionable over the window either in contact therewith or in close proximity thereto. In one embodiment, the heater is substantially transparent to the relevant wavelengths of electromagnetic radiation that are used in optical monitoring of respiratory gases, anesthetic agents, or the like. Alternatively, the heater may be configured so as to provide a substantially unobstructed optical pathway through the window. Optical gas sensors and complementary transducers that include the heater are also disclosed.

The invention discloses a test method of supercritical carbon dioxide content in coal. A determination device consisting of a vacuum pump, a coal sample tank, a carbon dioxide cylinder, a pressure device and a high-accuracy balance is used in the test method. The test method comprises the following steps of calculating the quantity of gas filled into an adsorption tank by measuring the mass variation of the adsorption tank, substracting the gas phase content increased in a free space of the adsorption tank to obtain the excess adsorption quantity of a coal sample under balance pressure, and calculating the gas phase carbon dioxide content in a coal pore by utilizing a non-ideal gas equation according to the pore pressure. The supercritical carbon dioxide content in coal is a sum of the excess adsorption quantity and the gas phase content of the pore space in coal, tests of a plurality of balance pressures can be finished by measuring carbon dioxide contents in the coal sample under different balance pressures. The test method has the advantages of simpleness and low requirement to an instrument and equipment, can accurately and conveniently measure the carbon dioxide content in coal and is beneficial to test research on the carbon dioxide content in coal.

The invention discloses a magnet measuring device and a magnet measuring method. The magnet measuring device comprises a lead screw with a screw and nuts, a motor used to drive the screw in the lead screw to rotate, a measuring table which is provided with a probe hole, a magnet locating plate, and a Hall probe block. The magnet locating plate is provided with a location hole which is used to place a to-be-tested magnet, and the magnet locating plate moves on the measuring table with movement of the nuts of the lead screw. The Hall probe block is provided with a Hall sensor, and is used to measure magnetic fields of each position of the to-be-tested magnet, the to-be-tested magnet passing above the Hall sensor. The Hall probe block is disposed in the probe hole of the measuring table. The magnet measuring method uses forward and reverse measuring, numerical filter, and curve fitting. Using the magnet measuring device and the magnet measuring method can greatly improve efficiency. The device provided in the invention can make a surface of the magnet maintain contact with the sensor, and defects of inaccurate measuring results caused by an unstable air gap or an excessive air gap are overcome.

Disclosed is a high sensitivity ultrasonic probe comprising a connecting head (1), a shell (2), a damping block (3), a cable line (4), a diode (5), an acoustic lens (6) and a cable line (7); the probe is characterized in that: the high sensitivity ultrasonic probe comprises two to twenty elements (8) that can transmit and receive supersonic waves; wherein: the connecting head (1) is fixedly connected with the shell (2), the damping block (3) is fixedly arranged inside the shell (2), the cable line (4) is connected with the diode (5) and disposed inside the shell (2), and the acoustic lens (6) is arranged under the elements (8) that can transmit and receive supersonic waves. The ultrasonic probe has the advantages of: high sensitivity in defect detection, high signal-noise ratio, strong resolving power to adjacent defects, small non-detection zone, being easy in accurate positioning to defects and accurate measurement of sizes of defects, and good directivity.

The invention discloses a PM motor direct power control constant-air-volume control method and an HVAC system using same. The control method comprises the steps of step A, receiving the target air volume IN-CFM through a starting motor; step B, obtaining a corresponding function P=f (n) according to the target air volume IN-CFM; step C, entering a direct power control constant-air-volume control mode: controlling the motor to reach a stable work point (pt, nt) along the function P=f (n) control track; step D, calculating motor real-time input power Pi according to motor operation parameters, wherein delta P= / Pt-Pi / ; step E, maintaining the prior work point if delta P is smaller than the set value Pset; step F, calculating whether the speed ring operation time is reached if delta P is larger than or equal to the set value Pset, and maintaining the prior work point if the operation time is not reached; step G, entering the speed control circuit adjusting speed, that is, making pt=Pi and nt=ni, if the time is reached to achieve a novel work point (Pi, ni) on the track, and returning to the step C. The control method and the HVAC system have the advantages that the method is particularly applicable to air volume control in the steady state, the algorithm is concise, the requirement for CPU operation is not high, the cost is low, and the control accuracy is high.

The invention discloses a flexible cell management system and belongs to the cell management and energy storage field. The flexible cell management system can realize flexible measurement, protection and management on cells of the cell groups, has low requirements for external voltages and can be directly connected with AC. The flexible cell management system comprises multiple cell management units connected in serial and in parallel, wherein each cell management unit comprises one or two cells and four or six switches, and can realize external port positive connection, reverse connection and bypass functions, and the switches can any type of diodes, triodes, relays, thyristors, silicon controlled rectifiers, MOS tubes and IGBTs and can also be combination of all the types above to form a bi-directional switch module or device. The flexible cell management system can be composed of multiple cell management units in series, in parallel, in series and then in parallel, in parallel and then in series, or in hybrid connection mode. The flexible cell management system has low requirements for external charging and discharging voltages and can even realize external AC charging and discharging, the flexible cell management system further improves reliability of the cell groups, and internal resistance can be easily and accurately measured.

The invention relates to a detecting device, in particular to a device for detecting the slump of concrete. The invention aims at providing the device with accurate measurement data for detecting the slump of the concrete. For solving the technical problem, the invention provides the device for detecting the slump of the concrete. The device comprises a side plate, a top plate, a left-right moving mechanism, a stirring mechanism, a rotating mechanism, a fixing mechanism, a measuring mechanism, a slump barrel, a first supporting rod, a second supporting rod, a collecting frame and a base plate, wherein the second supporting rod is rotationally connected with the top of the base plate; the collecting frame is arranged at the top of the base plate; the side plate is fixedly connected to one end part of the base plate in the vertical direction; a first through hole allowing the collecting frame to penetrate through is formed in the side plates; the first supporting rod is fixedly connected to the top of the base plate. According to the device disclosed by the invention, the effect of conveniently and accurately measuring the slump of the concrete is realized.

The invention relates to a method and system for reconstructing a three-dimensional left ventricular profile of a cardiac magnetic resonance image. The method includes the step of building a mixture Gauss model of the cardiac magnetic resonance image, the step of initializing a movable profile model, the step of determining left ventricular inner and outer surface profiles, and the step of reconstructing the three-dimensional left ventricular profile. According to the method and system for reconstructing the three-dimensional left ventricular profile of the cardiac magnetic resonance image, the magnetic resonance image is divided into multiple areas by means of the mixture Gauss model, then the movable profile model is initialized by means of a movable square method, the left ventricular inner and outer surface profiles are obtained by solving an energy minimization equation by means of the movable profile model, and then the three-dimensional profile is reconstructed through the left ventricular inner and outer surface profiles. Due to the fact that the left ventricular inner and outer surface profiles obtained through the mixture Gauss model and the movable profile model are relatively accurate, accuracy of the reconstructed profile is relatively high.

Disclosed are an apparatus and a method for detecting the burying depth of guard steel bar columns with shock elasticity wave. A sensor is provided on the side wall of the guard steel bar, when the elastic wave emitted from shock hammer is transferred to the other end of the column along with the axis of the column and is reflected back by this end, the elastic wave signal detected by the sensor is amplified by charge amplifier, and is transmitted into digital signal for calculating and displaying on computer terminal after going through channel base and analog / digital converting card. The inventive method comprises: employing the reflection of shock elastic wave between the two ends of the buried steel tube, identifying steel tube's burying depth by analyzing the characteristics of the reflecting wave.

The invention provides a handheld mechanism of a seven-freedom master operating mechanical hand, and belongs to the technical field of medical apparatuses and instruments. The handheld mechanism solves the problems that an existing clamping structure of a minimally invasive robot cannot automatically return and cannot realize active operation. The handheld mechanism of the seven-freedom master operating mechanical hand comprises a supporting base and a rotary shaft which is arranged in the supporting base in a penetrating mode and can rotate around the central axis of the rotary shaft, wherein the outer end of the rotary shaft is hinged with two opposite clamping hands; the outer end part of the rotary shaft is provided with axially extending open slots; the two clamping hands are symmetrically hinged in the open slots; a limiting assembly for limiting the two clamping hands from outwards rotating by a maximal angle is arranged on the rotary shaft; and a return structure for returning the two clamping heads after the clamping heads inwards rotate is arranged between the two clamping hands. The handheld mechanism has the advantages of being high in freedom, capable of automatically returning, capable of realizing active action and the like.

The invention discloses an on-line measurement device and measurement method of a grounding resistor. The on-line measurement device comprises an on-site measurement device and a background algorithm processing center. The on-site measurement device comprises a power supply module, a variable-frequency power supply module, a weak signal conditioning module, a data acquisition module, a main control chip, a man-machine interaction module and a ground loop; the variable-frequency power supply module, the data acquisition module, the power supply module and the man-machine interaction module are connected with the main control chip; and the variable-frequency power supply module and the weak signal conditioning module are connected with the data acquisition module. The ground loop comprises a voltage jaw and a current jaw. The background algorithm processing center adopts a hybrid genetic algorithm to perform data processing, and then a grounding resistance value of a measured electrode is obtained. After the structure and the method are adopted, on-line real-time detection can be achieved, and a grounding lead does not need to be disconnected; and a grounding equation set is constructed through the grounding resistance value obtained through measurement, and a calculation of the grounding resistance value is achieved through an application of the hybrid genetic algorithm, so a measurement error is reduced, and the measurement is convenient and accurate.

The invention discloses a tolerance test template for a master node of a ship hull and a detection method thereof. The tolerance test template is formed by surrounding a first angle side, a second angle side and a hypotenuse; a certain angle is formed between the first angle side and the second angle side; three graduation marks are arranged above the first angle side; the middle graduation mark is a theoretical graduation mark; and the graduation marks at the two sides are range graduation marks allowable to the tolerance test standards. The tolerance test template for the master node of the ship hull and the detection method thereof have the advantages that: the measurement of the node of the ship hull is facilitated, a basis is provided for angle measurement, and the tolerance test template is simple in structure and convenient in carrying.