455results 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 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.

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.

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 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 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.

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 hand-held mechanism of a seven-degree-of-freedom main manipulator, which belongs to the technical field of medical devices. It solves the problems that the clamping structure of the existing minimally invasive robot cannot be automatically reset and cannot realize active action. The hand-held mechanism of the seven-degree-of-freedom main manipulator includes a support and a rotating shaft that can rotate around its own central axis through the support. The outer end of the rotating shaft is hinged with two oppositely arranged grippers. The outer end of the rotating shaft has The slot extends along its axial direction, and the two grippers are symmetrically hinged in the slot. The rotating shaft is provided with a limit assembly for limiting the maximum angle of outward rotation of the two grippers. The reset structure used to reset the two grippers after rotation. The invention has the advantages of high degree of freedom, automatic reset, 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.