54results about How to "Simple measuring device" patented technology

The invention discloses a chaotic visible laser-based optical fiber fault positioning device and a positioning method thereof. The positioning device comprises a chaotic visible laser emitting device, an optical fiber coupler, an optical circulator, a photoelectric detector, an A/D (Analog/Digital) converter, a signal processing device and a display device. Chaotic visible laser signals emitted by the chaotic visible laser emitting device generate obvious visible bright spots at a fault point (11) of an optical fiber line to be tested (4) due to transmission, and the accurate positioning of the fault point can be realized by finding the visible bright spots in a range of the distance between a detection point and the fault point (11). According to the positioning device and the positioning method, the chaotic visible laser is used as a detection light source, and a chaos-related fault point detection technology and a visible optical fiber fault point detection technology are integrated, so that the fast and accurate detection and positioning of the optical fiber fault point is realized, and the problem that the optical fiber fault point is easily measured and not easily positioned is solved.

The invention relates to a system and a method of measuring the resistance and inductance of an earthed network through dash current, which solve the problem of measuring the ground impedance, resistance and inductance of the earthed network when the lightning current passes through the earthed network. The input of a dash current generator (B) is connected with the output of an isolating transformer (A), the input of the isolating transformer (A) is connected with an AC power supply, the output of the dash current generator (B) charges a capacitor (I) through a silicon stack (C) and a protective resistance (D), a silicon controlled (G) controls the capacitor (I) to discharge to a test loop, a shunting resistance (F), an adjustable inductance (E) and an equivalent ground network (H) are connected in series in the discharge loop of the capacitor (I), and a first divider resistance and a second divider resistance (M1, M2) are connected in parallel with the equivalent ground network (H). The shunting resistance (F) and the second divider resistance (M2) are connected with the input of an A/D converter (J), and the output of the A/D converter is connected with a microprocessor (K).

The invention provides a monitoring and measuring method using a displacement sensor to measure tunnel deformation. The monitoring and measuring method comprises the steps of setting a measurement point on a section of an arc tunnel, and connecting a line; arranging a connection rod at an arc measurement point; fixing a displacement transfer rod on the connection rod and fixing a first base on the connection rod; arranging a horizontal measuring rod at the position of the measuring point, and arranging a second base on the horizontal measuring rod; respectively setting the crosspoints of the displacement transfer rod and a horizontal measuring line as a first measurement point and a second measurement point; fixing a displacement sensor bracket on the first base or the second base, and arranging a horizontal direction displacement sensor and a vertical direction displacement sensor on the displacement sensor bracket; measuring horizontal clearance variation and vertical clearance variation, judging the deformation situation of the tunnel accordingly, calculating the horizontal clearance variation between a left measurement point and a right measurement point, and calculating a mean value of the vertical clearance variation between the arc measurement point and the horizontal measurement line. The monitoring and measuring method provided by the invention has the advantages of rapidness in test, high testing precision, less interference on construction and low cost, can be used for monitoring in real time, and can be used for determining whether the tunnel is biased or not according to the testing result of the clearance variation of the channel.

The invention discloses a device and method for testing air cooling heat-removal system performance. It sets specimen in flue of air cooling heat-removal. By controlling the temperature difference between specimen and external temperature to determine thermal convection resistance of the system, the performance of the system would be judged according to the thermal convection resistance. It has the advantages of simple method, high sensitivity, low cost and real time detecting heat-removal situation, and improving the maintainability of communication device.

A microwave sensor used for steam humidity detection belongs to the technical field of testing and is used to solve the problem of steam humidity detection. The technical solution is that it includes a cylindrical cavity with openings at both ends and a microwave signal transmission interface in the middle, and a ring divider is respectively arranged at both ends of the cylindrical cavity, and the ring divider is composed of It consists of 1 to 4 cylinders coaxial with the cylindrical cavity, one end of which is close to the port of the cylindrical cavity is connected with the cylindrical cavity, and the expansion coefficient of the ring separator is larger than that of the cylindrical cavity. The invention has the advantages of simple structure, convenient use and low requirements on the environment, and can realize high-precision online measurement of the humidity of flowing wet steam by cooperating with the microwave signal processing circuit.

The invention discloses a device and a method for measuring a spatial free attitude of a rigid object, and a method for analyzing data, and relates to a measurement technology. The device comprises a planar orthogonal four-directional cursor generation device and a linear array charge coupled device (CCD); and the linear array CCD is provided with a data output interface. In the invention, a position detector consists of a plurality of linear array CCDs, so the problem that a detector with a large planar array position cannot be substituted is solved, the measurement device is simplified and the same measurement precision within a measurement range can be guaranteed. By adoption of the method for processing the data, the measurement of a linear light position can reach the subpixel level under the condition of poor data quality; and finally, a systematic measurement result can reach a higher level.

The invention discloses a dual-camera measuring method for accurate calibration of distance between optical identification points. The method, by calibrating the relative position of the two cameras by using a single-shaft motor displacement platform, increases the calibration precision of a binocular stereo vision system and the measuring precision of 3 dimensional coordinates of the optical identification points, and achieves the purpose of accurate calibration of the distance between optical identification points. The method comprises the following steps: using a calibration board to calibration the binocular stereo vision system to obtain the internal parameter matrixes and deformation parameter matrixes of the two cameras and the rotation matrix and the translation vector of the second camera with respect to the first camera; using the single-shaft motor displacement platform to translate a single optical identification point for a known distance, using the known distance to complete the calibration of the binocular stereo vision system; using the calibrated binocular stereo vision system, based on the basic binocular stereo vision theory, to conduct accurate measurement on the distance between two identification points on a reference scale in a direct way.

The invention relates to a device and a method thereof for acquiring a transmission fluctuation spatial correlation spectrum. A polychromatic light source is used for irradiation, when the light source passes through a dispersor, the distances between an incident light focus and reflected light focuses with different wavelengths in a measurement region are different, and thus the corresponding spatial correlations are different. An incident light beam and a reflected light beam are dispersed and absorbed in the measurement region under the action of particles, thereby causing extinction. A split light beam passes through a half reflecting and half transparent plain glass and is focused on a light sensing element by a lens, thereby obtaining a transmission correlation spectrum. The invention effectively solves the problem that the particle measurement range is limited because of mechanical operation in the measurement process. A transmission fluctuation spatial correlation spectral method is irrelevant to the flow field of the particles, has simple structure and can be used for detecting a particle system in laminar flow and onflow states in real time and on line, thereby testing the particle size distribution and the concentration of micron-sized particles. The invention can be widely applied to various fields of scientific research, production and process control of chemical industry energy sources, environment protection, water quality detection and particle measurement.

The invention discloses a device and a method for measuring disturbance of a cross flow fan impeller of a pulsed gas laser. The device and the method are mainly used for measuring the disturbance of the fan impeller. The device comprises an exploring laser light source, a beam expanding system, two spectroscopes, two reflecting mirrors, a photoelectric detector, a data acquisition unit and a processor, wherein the two spectroscopes and the two reflecting mirrors form a Mach-Zehnder interferometric system; the two spectroscopes are respectively arranged at both ends of a flow field area to be tested; the exploring laser light source, the beam expanding system and a first spectroscope are located on the same light path in sequence; and the photoelectric detector is located on the emergent light path of a second spectroscope. The method comprises the following steps: performing filtering on a signal, and then performing fast Fourier transform (FFT) treatment on the signal through controlling the data sampling frequency and the number of samples; converting a periodic disturbance signal of a time domain into a signal of a frequency domain to obtain a signal spectrum so as to determine the disturbance of the fan impeller. According to the device and the method disclosed by the invention, the disturbance information of fan rotation is obtained through an optical measurement mode. The device and the method have the characteristics that the measuring device is simple and is high in precision and convenient in operation and the method is very high in practical applicability.

A process for monitoring the spray stream during thermal spraying of spray material, which contains at least two different materials A and B, by means infrared thermography, wherein the thermographic measured values are divided into at least two regions of the radiation intensity and these are assigned or associated to the respective image data for the at least two materials A and B as well as processes for controlling a thermal spray process with spray material multiple materials, wherein the material distribution of at least two materials A and B and their material specific average temperatures and/or radiation intensities within the spray stream are employed as normed values for the spray parameter carrier gas flow through, burner or flame power and/or material dosing.

The invention relates to the technical field of measurement and provides a method for measuring and calculating the median particle diameter of particles in the exhaust gas of a compression ignition engine. A method for measuring the median particle diameter of the particles in the exhaust gas of a diesel engine mainly comprises the following steps: collecting particle samples to be measured; dispersing the particle samples to be measured; acquiring an electron microscope image of dispersed particles; judging the dispersion degree of agglomerated particles; and solving the diameter of a single particle in Mi to finally obtain the median particle diameter D50 of the particles in the exhaust gas of the diesel engine. Compared with the prior art, the method has the characteristics that the particle diameter can be obtained without conversion of the current and the particle diameter; and the particles with the particle diameter of 0.1 to 0.5 micron can be intuitively obtained. Through the particle electron microscope image processing, the single particle can be distinguished, and the particle diameter measurement accuracy of the particles is improved.

The invention discloses a method for correcting influence of thermal current on the related measuring precision of a digital image. A circular identification point array before and after that influence of thermal current is stabilized is identified, a 3D-DIC algorithm is used to solve displacement of a test piece sprayed with speckled along directions x, y and z, a parameter matrix in which the influence of thermal current causes a virtual displacement field of circular identification points is used to correct the displacement along the directions x, y and z, and thus, a more accurate surfacedisplacement field of the tested piece under influence of the thermal current is obtained. According to the method, a measuring device is simple, realization is easy, use is convenient and effective,the relative cost is lower, the influence of the thermal current on system imaging is reduced effectively, and the influence of thermal current on related measurement precision of the digital image can be corrected effectively.

The invention discloses a damage-free quick measurement method of a high temperature contact thermal resistance. According to the medium temperature-ultrasonic propagation characters, ultrasonic propagation time under a transient heat transfer condition is acquired by means of an ultrasonic-echo method, and further the inverse problem of thermo-conduction is subjected to optimization solution, sothat the interface contact thermal resistance parameters, changing with temperature, are measured in a quick, damage-free and non-contact manner. The method only needs simple measurement devices and short measurement period, is free of contact between a sensor and a to-be-tested test piece, so that interference due to the contact between the sensor and the to-be-tested test piece and limitation onmeasurement range due to high temperature resistance of the sensor are avoided.

The invention provides an ultrasound-based non-destructive measurement method of the intensity and position of an internal heat source. The method is characterized in that the time delay characteristic and the boundary temperature variation of ultrasonic waves during the internal propagation in a structure are simultaneously considered, and the solution is performed combining with inverse heat conduction problems, so as to perform non-destructive and fast measurement on the intensity and position of the heat source, which can change along with time in the structure. In the invention, no temperature information of internal points of the structure is needed to be acquired, so that measuring devices are simplified, and the operation is easy and convenient; and compared with an infrared detection technique of the internal heat source, the method disclosed by the invention can more effectively detect the intensity and position of the internal heat source of the structure, and has the advantages of high measuring speed, large measuring range and the like.

The invention discloses a frosting uniformity measurement method and system. The system is applicable to an outdoor multi-loop heat exchanger of an air source heat pump. The method comprises the following steps: acquiring the receiver voltage VOUT of a photoelectric sensor wound around the coil pipe outlet of each heat exchanger loop at the same time; exporting the output voltage signal UTEPS of each photoelectric sensor through logical operation; acquiring the frosting amount F of each heat exchanger loop through logical operation; comparing the frosting amount F of one heat exchanger loop with those of the other heat exchanger loops, and selecting the maximum value and the minimum value; and calculating the frosting uniformity FEV. The method has the advantages that only several related physical quantities need to measure; the voltage value of each photoelectric sensor is regarded as the most important measurement data; the measurement mode is simple; the relatively precise measurement can be performed without very large equipment; and the air source heat pump needs not be stopped in the measurement process. Therefore, the technical problem about how to measure the frosting uniformity of the air source heat pump provided with the outdoor multi-loop heat exchanger and other related problems can be effectively solved.

The invention relates to a various mixed gas pressure measuring device and method based on a saturation absorption spectrum; the method comprises the following steps: measuring a laser absorption spectrum of the alkali metal atom when various gases exist in an alkali metal air chamber, fitting to obtain the aliasing pressure broadening and frequency shift of the various mixed gases in the alkali metal air chamber; simultaneously calculating to obtain pressure of each of various gases according to pressure broadening and frequency shift corresponding to known single and unit pressure gas. When n alkali metals exist, the device and method can measure 4n mixed gases at most. When the alkali metal air chamber contains two or more mixed gases, the method and the device can preciously measure the pressure, i.e., the inertia based on spin exchange relaxation free regime and the alkali metal air chamber portion in a magnetic field measure apparatus.

The invention discloses a vector Doppler effect measurement method and device. The method achieves the simultaneous measurement of the movement speed and direction of a transverse moving object through a polarization non-uniform distribution vector light field. The device comprises a polarization non-uniform distribution vector light source and a detection device, wherein the polarization non-uniform distribution vector light source is used for generating a transverse vector light field or a cylindrical vector light field, and the detection device is used for detecting vector Doppler signals obtained by sampling different spatial positions in the vector light field by the transverse moving object, so that the movement speed and direction of the transverse moving object are measured at thesame time. According to the invention, full-vector information of the moving speed and direction of the transverse moving object can be measured simultaneously, the method breaks through the limitation that the traditional scheme can only measure the speed of transverse moving object and cannot distinguish the direction, can also monitor the motion state of the object in real time, has wide application prospects in the aspects of optical measurement, sensing and the like, and fills up the blank in the related technical fields.

The invention relates to a method for measuring density of desulfurization slurry in a power plant desulfurization pre-washing tower. The method includes: measuring slurry pressures of the pre-washing tower at different horizontal heights, subtracting the measurements to obtain a slurry pressure difference P corresponding to a difference h of the different horizontal height, and acquiring density Rho of the desulfurization slurry in the pre-washing tower according to the formula: Rho = P/(gh). Also related to is a system for measuring density of desulfurization slurry in a power plant desulfurization pre-washing tower, and the density of desulfurization slurry is measured precisely using the method. The density of desulfurization slurry in the desulfurization pre-washing tower can be measured precisely through the system and method, measuring equipment is simplified, and measuring precision is improved; meanwhile, the system is simple in structure, the method is simple, and the system and method have significant effect and are suitable for popularization and use.

The invention provides a device for measuring a nonlinear absorption curve of a material. According to the device, required single-wavelength laser is acquired by using a crystal frequency doubling system and a dispersing prism, intensity of incoming laser is increased through a long-focus lens, a scientific-level CCD (charge coupled device) camera records the energy and spot size of the incoming laser, energy of exiting laser is measured through an energy meter, and the nonlinear absorption curve of a sample under detection is acquired. The device provides a wider measuring range for the nonlinear absorption curve, a nonlinear absorption curve measuring system is simplified, and multi-wavelength, wide-range and high-precision nonlinear absorption curve measurement is achieved.

The invention discloses a PEPS system field intensity calibration method and a PEPS system field intensity calibration system.The PEPS system field intensity calibration method is suitable for the PEPS system field intensity calibration system.The PEPS system field intensity calibration method comprises the steps: marking all test points of a vehicle body at equal intervals; establishing a test data table according to the test points in the action area of the plurality of low-frequency antennas; obtaining RSSI values of all test points; calculating a threshold value of the RSSI value; and determining the position of the intelligent key according to the threshold value of the RSSI value. The PEPS system field intensity calibration system comprises a plurality of low-frequency antennas, an intelligent key, a vehicle body controller and a display, wherein the low-frequency antennas, the intelligent key, the vehicle body controller and the display are electrically connected. The method has the advantages that the intelligent key is used as a measurement tool for PEPS system field intensity calibration, and the space inside and outside the vehicle is divided through the action area of the low-frequency antenna, so that the calibration workload is reduced, and the calibration speed is increased.

The application discloses an HCT measuring device and method and a chemiluminiscence instrument provided with the HCT measuring device. The HCT measuring device comprises a shell, a liquid injection port is formed in the shell, the liquid injection port is communicated with a measuring cavity, and the other end of the measuring cavity is connected with a liquid pumping device; a measuring mechanism comprises an insulation sealing device and a graphite electrode plate, the insulation sealing device and the graphite electrode plate are pressed and fixed in the measuring cavity through an electrode pressing plate, and the electrode pressing plate is fixedly connected to the shell; the graphite electrode plate is in direct contact with a probe and is used for detecting the resistivity of a detected whole blood sample; a control analysis module arranged in the shell comprises a signal generator, a signal acquisition and processing module and a central processing unit which are connected with one another; the signal generator is used for outputting a driving signal to a whole blood sample, the signal acquisition and processing module is used for acquiring an electric signal detected by the probe and converting and transmitting the electric signal to the central processing unit after processing the electric signal, and the central processing unit is used for converting and calculatingresistivity and an HCT value.

The invention provides a system for measuring the reflectivity of a large-aperture optical element. In the system, a first light beam adjusting device converts wide-spectrum ultrafast laser into a linear light beam or a rectangular light beam; the initial optical resonant cavity does not comprise an optical element, and the linear light beam or the rectangular light beam is ring-down in the optical resonant cavity to form a first ring-down signal; the linear light beam or the rectangular light beam is ring-down in a test optical resonant cavity comprising an optical element to form a second ring-down signal; and correspondingly determining first ring-down time of an initial optical resonant cavity and second ring-down time of a test optical resonant cavity according to the collected first ring-down signal and the second ring-down signal, and obtaining the reflectivity of the optical element according to the first ring-down time, the second ring-down time, the cavity lengths of the initial optical resonant cavity and the test optical resonant cavity. According to the invention, the reflectivity measurement precision and speed of the optical element can be improved.