88results about How to "Large measuring range" patented technology

The invention relates to an industrial robot measurement method based on a tail end numbered tool. The method specifically includes the following steps that the overall arrangement of a work space is conducted, and the number tool and other devices are installed and fixed; a binocular CCD camera is calibrated, and a tool pre-calibration database is established; a DH kinematic model is updated so that the theoretical pose of a tool frame can be obtained; the images of numbered points are collected, and data processing is performed so that coordinate values can be obtained; coordinates are converted into a robot base frame from a camera frame; the position of the tool center and the posture of the tool frame are obtained according to captured point coordinates; as is verified in an experiment, positioning precision is improved. The measurement method solves the problem that a traditional vision system is narrow in positioning and tracing view field, effectively improves the positioning precision of the behaviors of the robot, has the advantages of being simple, reliable and efficient and reduces the cost for measuring the tail end pose of the robot.

The invention relates to a method for measuring a liquid-drop contact angle on a solid surface and a device thereof, which are used for measuring the contact angles of the liquid drops with different mediums and different sizes on the solid surface. The method comprises the following steps of: according to one-to-one correspondence between a liquid drop volume and a liquid drop contact angle, obtaining a plurality of liquid drop profiles which correspond to different contact angles, thus establishing a database used for storing different liquid drop profiles; when in measuring, fixing a sample on an earthquake isolation platform, and dropping the liquid with known volumes on the surface of the sample by utilizing a micro-injector; after the liquid drops achieve balance, acquiring a liquid drop image on the surface of the sample by utilizing an optical imaging system, a CCD camera and a computer; utilizing an image matching method to carry out processing and analyzing to the shapes of the liquid drops by computer software, and then carrying out calculation to obtain contact angles of the liquid drops; and matching the liquid drop profiles obtained by experimental measurements with the liquid drop profiles in the database so as to determine the corresponding contact angles. Compared with the existing method, the method takes the influence of volume and weight of the liquid drop in to consideration, thus improving the measuring precision.

The invention relates to a co-phasing control device and control method for a spliced telescope.The device comprises a spliced telescope body, a first beam splitter, a wavefront detector, a second beam splitter, a translation error detector and a wavefront controller, wherein the first beam splitter receives emergent rays and generates first divided beams and second divided beams; the wavefront detector detects the first divided beams and obtains system aberration data and wavefront distortion aberration data of transmission paths of all spliced sub mirrors; the second beam splitter receives the second divided beams and generates third divided beams and fourth divided beams; the translation error detector detects the third divided beams and collects dispersion interference fringes between each pair of spliced sub mirrors; the wavefront controller is connected with the wavefront detector, the translation error detector and a driver of a secondary separating deformable mirror.By means of the co-phasing control device and control method for the spliced telescope, real-time detection and compensation and correction of translation, inclination and higher order aberration can be effectively achieved, and compared with the technology in a current similar system, better accuracy and instantaneity are achieved.

The present invention is one kind of automatic continuous concrete contraction and stress measurer. On one test stage, there are two concrete molds, one for measuring stress and the other for measuring contraction. The mold for measuring concrete stress has one end fastened to the frame and the other end connected to the frame with screw and nut, and the other end of the screw has dynamometric quartz sensor connected with output signal fed to instrument or microcomputer. The mold for measuring concrete contraction has central hole in the two ends for the small steel column pre-buried inside concrete, one eddy current sensor is installed on the frame, and some interval is reserved between the small steel column and the sensor. When concrete contracts, the interval will change and the shrinkage of concrete may be measured and the signal the eddy current sensor outputs is fed to the instrument or microcomputer. The present invention has high measurement precision.

The invention belongs to the technical field of physical parameter measurement and relates to a device for measuring long stroke displacement based on the Hall effect. The device comprises a single chip microcomputer, a constant current source, a signal processing circuit, an analog-to-digital converter and a sensor array, wherein the sensor array is at least one group of linear hall sensors; each group of the linear hall sensors are uniformly and linearly arranged on a PCB (Printed Circuit Board); the space between the adjacent linear hall sensors is not less than the size of a magnet on a magnetic float in the arrangement direction of the sensor array; the differential outputs of the linear sensors are multiplexed with two differential voltage signal transmission lines through an n-channel analog multiplexer; the two differential voltage signal transmission lines are connected with an input interface of the signal processing circuit; the two adjacent PCBs are connected through an expansion interface; and each group of the linear hall sensors are powered by one same constant current source in a time sharing manner. The device has the advantages of low power consumption, fewer adopted devices, convenience in maintenance and lower cost.

The invention discloses a measuring device for an interferential sensor arm length difference. The measuring device comprises a broadband light source, a Mach-Zehnder intensity modulator, a microwave frequency sweeping source, a power divider, a direct-current stabilized power supply, a high-speed photoelectric detector, a radio-frequency amplifier, a phase shifter, a frequency mixer, a low-pass filter, an AD sampler and a measuring processer. The measuring device breaks through a thinking mode of measurement in a pure light domain, a microwave signal is led in, and a signal of the arm length difference is modulated on a light load microwave phase by the aid of an original light path structure of a sensor without damaging the sensor, so that the arm length difference is measured by demodulating the microwave phase. The measuring device mainly has the advantages that the measuring device is low in implementation cost, wide in measuring range, high in accuracy and high in speed, does not need to be supported by a special instrument and can fully automatically measure, manual adjustment is omitted, and a measuring result can be outputted only by connecting a measured sensor on the measuring device.

The invention discloses a load-sharing piezoelectric multi-dimensional force measuring device and a method for manufacturing the same, belongs to the field of piezoelectric sensors, and particularly relates to a testing device. The testing device is required for measuring force in three directions, and ranges of the force in the three directions are similar, and are of ten-thousand Newton classes. The method includes reasonably arranging a plurality of expansion pins on the periphery of a piezoelectric three-directional force sensor, and designing the expansion pins with different diameters so as to implement different load-sharing ratios; enabling the four expansion pins which are uniformly distributed to expand under actions of four taper pins so that a base can be tangentially and rigidly connected with an upper cover plate, and sharing load of force acting on the upper cover plate; and enabling the load-sharing ratios to be adjustable. The load-sharing piezoelectric multi-dimensional force measuring device comprises the base, the piezoelectric three-directional force sensor, the upper cover plate, the four expansion pins, the four taper pins, four set screws and a pre-tightening screw. The load-sharing piezoelectric multi-dimensional force measuring device and the method have the advantages that a testing application range of the piezoelectric multi-dimensional force measuring device is broadened by the method, and the load-sharing piezoelectric multi-dimensional force measuring device is wide in application space in fields of machining, aviation and aerospace.

The invention provides an on-chip clock uncertainty measurement circuit device. The device comprises a delay circuit and a detection unit, wherein the delay circuit comprises a rough adjustment circuit and a fine adjustment circuit; two paths of clock signals A and B to be measured from two different measurement points of the same time source on a chip are roughly adjusted and delayed by the rough adjustment circuit; the roughly adjusted clock signals A and B are finely adjusted and delayed by the fine adjustment circuit; the phases of the finely adjusted clock signals A and B are detected bythe detection unit; and the clock skew of the clock signals A and B is calculated when the phases of the finely adjusted clock signals A and B are the same. The invention also provides a measurement system which comprises the measurement circuit device and a ruler circuit. In the invention, on-chip measurement is performed on the clock skew and even clock jitter by using a composite non-linear delay line, so the measurement accuracy is high and the required data quantity is small.

The invention discloses a direct current power supply insulation detection device and detection method. The detection device includes a voltage detection module, a pair of balance bridge resistors, and a pair of detection bridge resistors, and also includes a current detection module used for detecting the sum of currents of the pair of balance bridge resistors during single-pole grounding insulation resistance value detection and detecting the sum of the currents of the pair of detection bridge resistors and current of each of the pair of detection bridge resistors during dual-pole grounding insulation resistance value detection; and a calculation module used for acquiring leakage current and calculating the single-pole grounding insulation resistance value according to grounding voltages of direct-current positive and negative buses and the acquired leakage current during single-pole grounding insulation resistance value detection, and acquiring leakage current and calculating the dual-pole grounding insulation resistance value according to the grounding voltages of the direct-current positive and negative buses and the acquired leakage current during dual-pole grounding insulation resistance value detection. By implementation of the technical scheme of the direct current power supply insulation detection device, the cost is low and the precision is high.

The invention provides a composite measurement system and measurement method for a micro-array complex surface optical element. The composite measurement system is composed of a white light interference micro-structure test system, a self-induction tuning-fork atomic power microscopy measurement head, a scanning and displacement platform, a nanometer measurement machine controller and a piezoelectric ceramic controller, wherein the white light interference micro-structure test system is formed by sequentially connecting an optical microscopy interference system, a digital CCD camera and an image capture card; the self-induction tuning-fork atomic power microscopy measurement head is fixed to the white light interference micro-structure test system; the scanning and displacement platform is located below the self-induction tuning-fork atomic power microscopy measurement head and used for holding samples to be tested; the nanometer measurement machine controller and the piezoelectric ceramic controller are respectively and electrically connected with the scanning and displacement platform. The output end of the white light interference micro-structure test system is electrically connected with a PC machine, the output end of the self-induction tuning-fork atomic power microscopy measurement head is electrically connected with the PC machine through a high-speed digital signal processing servo feedback control system, the output end of the piezoelectric ceramic controller is further electrically connected with the nanometer measurement machine controller, and the input end of the piezoelectric ceramic controller is electrically connected with the PC machine through the high-speed digital signal processing servo feedback control system. Multi-information sensing and data fusion are achieved.

The invention discloses a total station networking measurement method of a large-scale structural component, and belongs to the technical field of industrial measurement. The measurement accuracy in the prior art is low. The total station networking measurement method comprises the steps of before measurement is carried out, enabling a main station total station and an auxiliary station total station to be arranged on the two sides of the to-be-measured large-scale structural component, determining a main station user coordinate system, determining a plurality of reference points at the positions, located between the main station total station and the auxiliary station total station, of the periphery of the large-scale structural component, enabling the reference points to be brought into the main station user coordinate system, enabling six or more of the reference points to serve as station setting reference points, measuring the coordinate values of the station setting reference points, enabling the station setting reference points to be capable of being simultaneously measured by the auxiliary station total station, establishing an auxiliary station user coordinate system according to the station setting reference points, enabling the main station total station and the auxiliary station total station to respectively measure and record the coordinate values of the other reference points, and obtaining conversion parameters according to a parameter coordinate conversion equation. When measurement is carried out, data measured by the main station total station direct serve as measurement results, data measured by the auxiliary station total station serve as measurement results after coordinate conversion is carried out, and measurement on the whole large-scale structural component is completed.

The invention discloses a 3*3 type three-point dynamometric center-of-mass table system, which is prepared by combining multiple sensors. Three sensors with low standard measuring ranges are combined to form a sensor assembly with a higher precision and a non-standard measuring range; and three sensor assemblies with non-standard measuring ranges are assembled to form a center-of-mass table with a wide measuring range. According to the invention, errors caused by non-linear bearing of the sensors during multi-point test are prevented, and relatively large redundancy of measuring range and low precision caused by selection of wide-range sensors are avoided.

The invention relates to an experimental facility for testing the autoignition temperature of a gas under a special dangerous (high-pressure oxygen-enriched) condition. The experiment facility comprises a gas supply part, a temperature-controlled heating part, a reactor part, a safety interlocking device and a PC (Personal Computer), wherein the reactor part comprises a cylinder body and a flange plate which are sealed; and 6 pipelines are distributed on the flange plate and are respectively used for vacuumizing, pressure detection, temperature detection, stirring, electromagnetic valve evacuation and being used as a safety valve. When the temperature raises by more than 20DEG C sharply, the sample burns; and when the safety valve trips out, the gas autoignites or deflagrates. According to the experimental facility, the autoignition temperature data is obtained by adjusting the system pressure and continuous temperature rise under the sealed condition, automatically recording the temperature data and judging whether the autoignition happens, the measuring conditions of the autoignition temperature are broadened; and the experimental facility disclosed by the invention is simpler to operate and realizes computer automation of experimental operation and data recording.

The present invention discloses a large-scale atom-lattice nanometer measuring device, and comprises a multi-level shock-absorption system and a base, and is characterized in that a combined shock absorption terrace that is arranged on the base is provided with a nanometer feeding working terrace, and the movable nanometer feeding working terrace is provided with an atom lattice, and the nanometer feeding working terrace drives the atom lattice to move; a probe on a scanning tunnel microscope is arranged above the atom lattice, and the probe is driven by a piezoelectric ceramic driving device to move; a signal collector is connected with the scanning tunnel microscope; a pulse circuit converts the analog signal into a pulse signal to trigger the counter to count the number, and then is inputted into a computer to be processed. The measuring device greatly increases the measuring range and adapts to the requirements of the nanometer component processing technology; the maximum range on the direction of X is 20 mm, and the maximum range on the direction of Y is 20 mm; the nanometer measurement can be performed both on the direction of X and the direction of Y; the measurement range is decided by the maximum distance of the nanometer feeding working terrace.

The invention discloses an insulating linear displacement transmitting device. The feature is that it includes hall sensor and a MCU, LED display and transmitter. The hall sensor and the transmitter are connected by shielded cable, and the shell of hall sensor connects to the shell of transmitter. The other end of hall sensor connects to pump cover and/or tray by thread. The invention would be installed on the shielded pump or magnetic drive pump under high temperature corrosion, inflammable and detonable circumstance. It could accurately measure the displacement of the axis, and display on LED or take alarming, machine halt, and/or realize tele-controlling of the secondary instrument.

The invention relates to the field of laser processing and manufacturing, in particular to a relative laser shock strength characterization method which is realized by utilizing laser to shock on a single pendulum bob. The relative laser shock strength characterization method is used for guiding laser shock forming, laser shock processing and measurement of working states of a laser system so that the optimum shock effect of laser shock processing can be achieved. The method includes the steps of adopting a high-power pulse laser to shock on the pendulum bob through a reflector path system and to enable the pendulum bob to obtain impulse, measuring the laser shock strength according to the impulse of the pendulum bob and measuring the laser shock strength of targets made of different materials under a unified standard, and utilizing laser shock relative strength coefficients to characterize the diversity of different laser shock strength effects. Consequently, laser shock strength characterization is achieved. Meanwhile, the stability and continuity of the working states of the laser system can be measured through laser impulse, and on this basis, parameters of the laser work system can be adjusted. Through the relative laser shock strength characterization method, operation is convenient, accuracy is high and the use effect is good.

The invention discloses a method capable of accurately measuring cam two-dimensional curves, which relates to the technical field of measuring and detecting the cam two-dimensional curves. The method comprises the following steps: the cam two-dimensional curves are changed into parabolic curves, and then, the cam two-dimensional curves which are changed into the parabolic curves are measured by an equidistant measuring method. The technical scheme of the method capable of accurately measuring the cam two-dimensional curves has high measuring accuracy.

The invention discloses a continuous laser three-dimensional scanning method and device based on a Gresham's law hinge principle. The device comprises a laser, a reflecting mirror, a receiving telescope, a photoelectric detector and a signal synchronous circuit, wherein the reflecting mirror, the receiving telescope and the photoelectric detector placed according to the Gresham's law; the reflecting mirror is arranged on the crossing point of the object plane, the phase plane and the focal plane and can rotate for an angle; the signal synchronous circuit controls the photoelectric detector to follow the rotation synchronous upward and downward displacement of the reflecting mirror and always conforms to the Gresham's law; an adjustable reflecting mirror is put in front of the diode laser; the reflecting mirror reflects the laser to a target object in the environment and then reflects or reflects out a light signal; the light signal is received by the receiving telescope group; the light signal received by the receiving telescope can be gathered onto the photoelectric detector. The method and the device provided by the invention are applicable to prospective large-range object three-dimensional scanning; the rotating reflecting mirror and the upward and downward flat moving detector scanning imaging method is used; the continuous light scanning is realized; the high-precision and clear scanning image of an object in a remote position can be obtained.

The present invention discloses a resistance measurement circuit and a resistance measurement device. The resistance measurement circuit comprises: a data collection module comprising a to-be-measuredresistor connection end, a reference resistor connection end and a data signal output end, and configured to collect currents or voltages of a resistor to be measured and a reference resistor, wherein the to-be-measured resistor connection end and the reference resistor connection end are electrically isolated with the output end, and an input end, the output end and the power source are isolatedto one another; and a measurement module connected with the data signal output end and configured to measure the current or the voltage output by the data signal output end to measure the resistancevalue of the to-be-measured resistor. The data collection and the data measurement achieve electrical isolation to apply different voltages or currents or output different voltages or currents at thesame time and select reference points according to the physics and mathematics definition of the resistor so as to reduce the differential mode interference, the common mode interference and the noiseinterference, greatly facilitate resistance measurement, extend the measurement range, effectively reduce the measurement errors and improve the measurement precision.

The invention discloses a non-contact compound torque and angle position sensor, which comprises a driving gear assembly, a driven gear assembly, a measuring circuit and tested elements, wherein the driving gear assembly comprises two driving gears which are in coaxial rotation, the driven gear assembly is engaged with the driving gear assembly and is driven to rotate by the driving gear assembly, the measuring circuit is arranged between the two driving gears, the tested elements are arranged on the driven gear assembly and is driven to rotate by the driven gear assembly, the measuring circuit measures the rotating angle of the tested elements, and the torque and the angle position are calculated according to the rotating angle. The non-contact compound torque and angle position sensor has the advantages that the torque and the angle position are simultaneously calculated, the measuring range is wide, the precision is high, the structure is compact, and the assembly is simple.

The invention discloses a thermal expansion pressure simulation test system and method for simulating warhead projectile explosive charge. The system comprises a charge simulation chamber, an expansion pressure sensor assembly, a sealing compaction nut, an explosive member, a constant temperature system, a temperature compensating fiber grating, a fiber demodulation system and a measurement control system. Projectile body explosive charge and semisolid state explosive thermal expansion pressure can be directly measured. An explosive test piece is arranged in a simulation chamber cylinder, theexplosive test piece is compacted by the expansion pressure sensor assembly, sealing compaction is exerted onto the expansion pressure sensor assembly, the simulation chamber cylinder is further sealed to form a simulation test projectile, the simulation test projectile is disposed in the constant temperature system, and projectile explosive charge thermal expansion pressure change is measured. The system is advantaged in that operation is simple, the measurement scope is large, measurement accuracy is high, good safety is realized, and a technical problem of direct measurement of projectile body explosive charge and semisolid state explosive thermal expansion pressure is solved.

The invention discloses an industrial robot rigidity measurement loading device and a measurement thereof. The loading device comprises the components of a rotating base which can perform rotation along a horizontal plane; a force transmission seat which is fixedly connected with the rotating base and is internally provided with a lead screw that is rotatably arranged, wherein a lead screw nut sleeves a lead screw, and a hinging seat is fixed on the lead screw nut; and a connecting rod of which one end is hinged with the hinging seat, wherein the connecting rod can rotate in a vertical surface. A spring sleeves the connecting rod through a spacing assembly. A sleeve is arranged outside the spring. One end, which is far from the hinging seat, of the sleeve is provided with a connecting sleeve. The outer end of the connecting sleeve is connected with the end of an industrial robot. The industrial robot rigidity measurement loading device has advantages of simple structure, convenient operation, wide application range, high measurement efficiency. The industrial robot rigidity measurement loading device can realize measurement for static rigidity of the robot in an X-direction, a Y-direction and a Z-direction.

The invention relates to an acceleration measurement device and a data acquisition method based on range switching. The acceleration measurement device comprises an accelerometer, a range switching module, a first signal preprocessing module, a second signal preprocessing module and a signal processing and control unit. The accelerometer acquires acceleration information. The range switching module is connected with the first signal processing module or the second signal processing module according to a control signal and transmits the acceleration information to the first signal processing module or the second signal processing module. The first signal preprocessing module and the second signal preprocessing module respectively preprocess the acceleration information. The signal processing and control unit compares the preprocessed acceleration information with a preset value and generates the control signal to be transmitted to the range switching module. If the acceleration information is greater than the preset value, the range switching module is controlled to be connected with the first signal preprocessing module; and if the acceleration information is less than the preset value, the range switching module is controlled to be connected with the second signal preprocessing module. Different acceleration measurement requirements can be met.

A hole diameter measuring method based on staggered combination of laser trigonometry displacement sensors comprises steps as follows: two laser trigonometry displacement sensors are adopted and assembled in a parallel-staggered manner to form a measuring system; in a measuring range of the measuring system, the measuring system is arranged on one side in a to-be-measured hole, that is, the measuring system is located in a semicircle of the to-be-measured hole; measuring is started as follows: the measuring system is moved to another semicircle of the to-be-measured hole in the direction perpendicular to emergent rays of the laser trigonometry displacement sensors, and continuous sampling and recording are performed in the movement process; the maximum value of the sum of measuring values of the laser trigonometry displacement sensors at the same moment during continuous sampling is taken and is substituted into a formula for the hole diameter of the to-be-measured hole, and the diameter of the to-be-measured hole is obtained. Problems in the prior art are solved, and the measuring range of the whole measuring system is greatly enlarged through staggered placement of the double laser trigonometry displacement sensors, so that a smaller hole diameter can be measured with the method.

The signal acquiring and processing device includes pulse generating circuit, conducting pool with two electrodes connected to the output of the pulse generating circuit, weak signal amplifying circuit, sampling and holding circuit, secondary amplifying circuit, A/D sampling circuit, monochip computer processing circuit, and output display circuit connected together. The present invention adopts pulse signal excitation and sync multi-point sampling, and utilizes the equivalent circuit of conducting electrode in solution to solve pulse responding math equation, obtain solution conductivity and double-layer capacitance value and expand the detection range of the conducting detector. The present invention is suitable for the sample analysis with great component concentration ratio, and can avoid outer interference and instrument damage caused by maloperation.

The invention discloses a non-contact three-dimensional automatic scanning testing system, and the system comprises a positioner, a portal frame, a robot, a measurement workpiece, and a data processing control system. The positioner comprises two supports and a rotating clamping device. The portal frame comprises two X-axis moving guide rails for a walking mechanism, two Y-axis moving support columns, and one Z-axis moving cross beam. The tops of the Y-axis moving support columns are provided with the Z-axis moving cross beam, and the Z-axis moving cross beam is provided with a moving guide rail and a robot installation support. The robot installation support is provided with a flange seat, and a robot is fixedly installed on the flange seat. An end part of the robot is provided with a 3Dscanning measurer. The 3D scanning measurer comprises a camera and a projector, and the data processing control system comprises a robot control cabinet, an electrical control cabinet, and a PLC operating system. The robot control cabinet is electrically connected with the robot. According to the technical scheme of the invention, the travel control range can be enlarged, and the measurement precision and detection efficiency are improved. The system timely collects, processes and displays the measurement data, and can meet the requirements of various angles, precisions and speeds of differentworkpieces, and can be widely used for online application.

The invention discloses a data acquisition and parallel storage device and the method thereof, which are used for ensuring the effective storage of data. The device comprises a clock generating module, a data buffering module and a data storage module which are mutually connected; the data buffering module comprises first to fourth first-in first-out buffers which are provided with write clock signals of the same frequency and different phases; the first to fourth first-in first-out buffers are respectively connected with the clock generating module; the first to fourth first-in first-out buffers are also respectively connected with the data storage module; and the data storage module is used for splicing four paths of data signals of the data buffering module into one path of signal according to a sequence of sampled signals.

The embodiment of the invention discloses a torsion angle measuring device and method based on utilization of a polarization principle. The torsion angle measuring device based on utilization of the polarization principle comprises a polarized light emitting module and a torsion measuring module, wherein the polarized light emitting module is used for generating polarized light, and the torsion measuring module is positioned in front of the polarized light emitting module and used for receiving the polarized light, generating an electric signal corresponding to the light intensity and outputting torsion angle measurement data. The polarized light emitting module comprises a light source, a collimating lens and a first polarizing film, and the torsion measuring module comprises a second polarizing film, a rotating motor, an axial angle encoder, an objective lens and a photoelectric detector. The torsion angle measuring device based on the utilization of the polarization principle is simple in structure, software and hardware and high in integration level, high precision and wide range of torsion angle measurement are achieved at the same time, and the measuring method is simple andeasy to implement.

The invention discloses a re-improved L-shaped pitot tube for measuring flow velocity of fluid. According to the re-improved L-shaped pitot tube, the semispherical, semielliptical spherical or cone frustum-shaped section of the measuring head, which is used for measuring the total pressure, of the conventional L-shaped pitot tube is changed to be a section of small straight pipe, and a section of conical tube with a small taper angle or both a conical tube and an elliptic conical tube is/are connected between the small straight pipe and the small straight pipe of the pitot tube for transition. According to the invention, since the area of the measuring head is greatly reduced, and vortexes formed in front of the measuring opening can be reduced, so that the total pressure is measured more accurately, and higher flow velocity can be measured; since the measuring head becomes smaller, the conical tube with the small taper angle is adopted for transition, and fluid outside the tube is more stable, static pressure is measured more accurately; since the external diameter of the pitot tube is extremely small, and interference to the state of fluid in a measured tube is reduced, smaller air ducts can be measured, and the measurement range is enlarged.

The invention discloses a Y-type double-FBG (fiber Bragg grating) optical fiber vibration sensor for online monitoring hydraulic decoking of a coking tower. The Y-type double-FBG optical fiber vibration sensor comprises a vibration guide rod (2), a heat-radiating structure (3), a Y-type vibrating member (4), a sealing shell (5), a counterweight body (6), fiber Bragg gratings and a connecting base (1) supporting the whole sensor, a contact probe (10) at the left end of the vibration guide rod closely contacts with the wall of the coking tower, the heat-radiating structure is fixed on the vibration guide rod, the sealing shell is assembled on a fixing member (11) at the right end of the vibration guide rod through a screw port, the counterweight body and the Y-type vibrating member are positioned in the sealing shell, the first fiber Bragg grating is led out from one end of the Y-type vibrating member and then fixed on the sealing shell, and the second fiber Bragg grating is led out and pre-stretched from the other end of the Y-type vibrating member and then fixed on the sealing shell. The Y-type double-FBG optical fiber vibration sensor has the advantages of high response frequency, wide measuring range, safety in nature and the like, and can collect high-frequency vibrating signals generated when high-pressure water strikes the wall of the coking tower in the process of hydraulic decoking so as to complete hydraulic decoking process.