32results about How to "Will not affect measurement results" patented technology

The device has a rotating grinding face (3) contacted by the spinning cylinder (5) which fits in a socket holder (10) which moves up to the grinding face. The size of the cylinder inserted in the holder is established by a detector comprising distance sensors (15a,15b,15c) which operate with measuring beams (17a,17b,17c) aligned so that they strike the sleeve face of a cylinder in the holder at three or more points spaced out relative to one another in the peripheral direction of the cylinder. The distance sensors are fixed on a common holder through positive locking elements. The sensors operate on a triangulation principle.

The invention relates to a hydrogen sensor and a Pd film hydrogen sensitive system, wherein the hydrogen sensor comprises introduction fiber, reflection fiber and a hollow tube, a surface of which has a Pd or Pb alloy film, the introduction fiber and the reflection fiber are respectively connected with two ends of a cavity of the hollow tube, two opposite fiber end faces are parallel and constitute an intervene cavity with the tube cavity. According to the Pd film hydrogen sensitive system, light with wide spectrum is transmitted to the introduction fiber of a hydrogen sensor, and intervene light generated on two opposite end of the introduction fiber and the reflection fiber is received, change of the length of the intervene cavity is determined through collecting intervene spectrum signals, further computing concentration of hydrogen. The invention overcomes problems that it is difficult to realize high resolution stable measurement due to light source fluctuation and optical fiber disturbance and the like, and is easy to be affected by temperature in prior art. Measurement result is correct and temperature is strong, cost is low.

The invention discloses a flame recognition system used for an aircraft engine combustor. The flame recognition system used for the aircraft engine combustor comprises a combustor body and an exhausting segment; a flame observing turning-connection segment communicated with the combustor body and the exhausting segment is connected between the combustor body and the exhausting segment; a high temperature refracting mirror with the light incoming end right opposite to the combustor body is installed in the flame observing turning-connection segment; the light outgoing end of the high temperature refracting mirror is connected with a flame image shooting system located outside the flame observing turning-connection segment; the flame image shooting system is connected with a flame image processing system and recognizing system; the flame image shooting system is used for acquiring a real-time image of the combustor body through the high temperature refracting mirror; and the flame imageprocessing system and recognizing system is used for performing real-time diagnosis on the state in the combustor body according to the real-time image. According to the lame recognition system used for the aircraft engine combustor, the state of the combustor body is diagnosed in a non-contact manner, speed is high, and the accuracy rate is high; no interference on a flow field is caused, and themeasurement result is not affected by the environment in the combustor body; and the defects of judging on igniting / flameout of a thermocouple in the combustor body are overcome.

The present disclosure discloses a multi-spectral image acquisition device. The multi-spectral image acquisition device includes: a casing, a light source, a storage board, and an image collection hole, wherein: the light source and the storage board are located in the space formed by the housing; the light source is placed in The bottom of the housing is used to generate irradiation light; the object board is placed in the middle of the housing to carry the object to be detected; the object board is provided with an irradiation hole for transmitting the irradiation light, and the object to be detected is placed above the irradiation hole so that the irradiation The light is irradiated onto the detected object; the end of the housing away from the light source is provided with an image acquisition hole for collecting the image formed after the irradiated light irradiates the detected object. The invention uses different light sources to produce different wavelengths to irradiate the detected object, and uses a multi-spectral camera to take photos of different wavelengths to obtain images of different spectra, thereby avoiding complex optical structures and reducing costs. Interference, to ensure that all light entering the camera passes through the detected object.

The invention discloses a method for hysteresis loop measurement based on digital integration. An R-C (resistance-capacitance) active integrator is used for measuring a hysteresis loop of a magnetic material, and an R-C active circuit is subjected to analog-digital conversion, filtering and accumulation to obtain an integral induced voltage Ei in direct proportion to phi. The method includes the steps: after the induction potential ei generated by measurement changes of magnetic-flux in the magnetic material caused by an external magnetic field H of the magnetic material is amplified by an auto-zero amplifier, outputting integral induced voltage Ei within a period of time; using a high-speed A / D conversion module for converting analog signals of Ei into digital signals, performing A / D conversion for N times within a set timer delta t, and accumulating sigma Ei; obtaining a magnetic flux within delta t according to the equation that phi i=Ei X delta t; and subjecting all phi within the measurement period to arithmetic operation to obtain the magnetic flux of the external magnetic H of a corresponding tested sample. Hysteresis loop graphs of magnetic material materials have high reproducibility and closing performance.

The invention discloses an ultra-precise static-pressure main shaft dynamic characteristic online testing method capable of eliminating a measuring basis installation error and relates to the field of static-pressure main shaft dynamic characteristic testing. The method solves the problems that an existing method cannot achieve ultra-precise static-pressure main shaft dynamic characteristic online testing or a measurement result can be seriously influenced by the installation precision of a measuring reference plane according to the existing method. According to the ultra-precise static-pressure main shaft dynamic characteristic online testing method capable of eliminating the measuring basis installation error, a cone-shaped installation reference plane is machined at the rear end of a direct-driven ultra-precise static-pressure main shaft rotator, a standard ball is directly installed on the cone-shaped reference plane to serve as a measuring basis, two high-precision displacement sensors are adopted to measure the displacement change between the standard ball and the two high-precision displacement sensors when the main shaft rotates, the measured displacement change values are converted into a digital signal through a sensor signal amplification and data collection system and the digital signal is sent to a computer for data analysis and data processing, and then the ultra-precise direct-driven static-pressure main shaft dynamic characteristic online testing is achieved. Due to the fact that two channels are adopted to carry out measurement at the same time, detection of the axial deviation of the main shaft and detection of the radial deflection of the main shaft are achieved at the same time.

The invention discloses an induction liquid metal electromagnetic flowmeter, which comprises a circular flow channel, a heat insulation layer, an excitation coil, an excitation power supply, an induction signal pickup coil, a signal processing module and a shielding layer. The two sets of excitation coils are located at both ends of the electromagnetic flowmeter. The winding directions of the coils are opposite and the number of turns is the same. They are powered by the excitation power supply. The excitation power supply can generate high-frequency alternating current signals. The two sets of excitation coils generate opposite directions in the flow channel and have the same size. The magnetic induction intensity; when the liquid metal does not flow, the induced magnetic fields generated by the two sets of excitation coils cancel each other out, and when the liquid metal flows, it will cause the magnetic field at the position of the induction signal pick-up coil to change, and then in the induction signal pick-up coil. The alternating induced voltage proportional to the flow of liquid metal is used to obtain the flow signal through the signal processing module. The inductive liquid metal electromagnetic flowmeter of the present invention is suitable for measuring the flow of liquid metals, such as sodium, lithium, lead-bismuth alloy, sodium-potassium alloy, and the like.

The present invention relates to the technical field of failure analysis of semiconductor devices, and in particular to a method and system for measuring the saturation current of components. monitor and a plurality of probes; a component is placed on the adsorption chuck and electrically connected to the electrical monitor; the probe station uses a first probe to apply a fixing a voltage, and applying a variable current at both ends of the channel of the component by using a second probe and a third probe; and using the electrical monitor to monitor the variable current at both ends of the channel monitor.

The invention discloses a surface water conductivity non-contact measurement device and method. In the invention, an alternating current signal is output by an alternating current excitation source and is applied to an excitation electrode on the outer bottom side of a floating box through an induction module; a current signal reflecting the surface water conductivity information is obtained by a detection electrode; the current is amplified by a signal processing circuit, and is rectified and filtered to obtain a direct current voltage signal which is easy to measure; and a relational model of the conductivity and the output direct current voltage is established. According to the correspondence of the conductivity and the voltage, a surface water conductivity value can be obtained. In the invention, the influence of coupling capacitance on conductivity measurement is effectively eliminated by using a serial resonance method; and the device and the method can be used for measuring surface water conductivity. The device has the advantages of simple structure, no contact of the electrode and the surface water, high anti-interference capacity, low cost and the like; and an effective method is provided for outdoor long-term on-line detection of the conductivity of the surface water.

The invention discloses a dual-camera measurement method for precise calibration of the distance between optical marking points. A single-axis electric displacement platform is used to calibrate the relative positional relationship of the dual cameras, thereby improving the calibration accuracy and optical marking points of a binocular stereo vision system. The three-dimensional coordinate measurement accuracy is high, in order to achieve the purpose of accurate measurement of the distance between optical marking points. The method comprises the following steps: using a calibration board to calibrate the binocular stereo vision system to obtain the internal parameter matrix of the two cameras, the distortion parameter matrix, the rotation matrix and the translation vector of the second camera relative to the first camera; The displacement platform performs a known distance translation on a single optical mark point, and uses the known distance to complete the calibration of the binocular stereo vision system; using the calibrated binocular stereo vision system, according to the basic principle of binocular stereo vision, the direct reference ruler Accurately measure the distance between the two marked points.