157results about How to "Simple measuring principle" patented technology

The invention discloses a water level-flow speed-flow rate monitoring integrated device, a water level-flow speed-flow rate monitoring system and a water level-flow speed-flow rate monitoring method. The device comprises a radar water level measuring module, a radar flow speed measuring module, a wind speed measuring module and a flow rate calculating module, wherein the radar water level measuring module, the radar flow speed measuring module and the wind speed measuring module are connected with the flow rate calculating module respectively; the radar water level measuring module is used for measuring the real-time water level data of a river course / channel in a non-contact form; the radar flow speed measuring module is used for measuring the real-time surface flow speed data of the river course / channel in the non-contact form; the wind speed measuring module is used for measuring real-time wind speed data to correct a flow speed of a water surface; the flow rate calculating module is used for calculating to obtain the size of the flow rate of a controlled section of the river course / channel at a current moment by combining with an input relevant parameter of the controlled section of the river course / channel according to the water level data, the flow speed data and the wind speed data. The device can be used for monitoring the water level and the flow speed of the river course / channel in real time, and moreover, can be used for realizing monitoring the flow rate in real time.

The invention discloses an automatic observation device for crop development and growth. The device comprises an image acquisition part, a communication transmission system and a data processing centre, wherein the image acquisition part comprises a CCD camera, a video monitor and a lightning conductor which are fixed with a bracket; the bracket is arranged in a crop planting area; an antenna fixed to the top end of the bracket is in wireless connection with a computer which receives and processes the data of the crop development and growth and is arranged in a data processing centre through a wireless network; the communication transmission system comprises antennae and encoders respectively positioned on the image acquisition part and the two ends of the data processing centre; and the computer in the data processing centre comprises an image database, an image feature algorithm library and a product library. The device performs real-time automatic acquisition and identification on crop growth information, performs long-term observation, analysis and measurement remotely through a network, automatically measures aiming at the crop growth, has a simple measurement principle and an accurate measurement result, is convenient to popularize and use, and has significance to promote the modernization and the automation of agricultural meteorological observation.

The invention relates to a burst point three-dimensional coordinate measurement device and a burst point three-dimensional coordinate measurement method used in a target range to measure proximity fuse operating distance. The conventional photoelectric detection methods are mainly four-light-curtain junction and charge coupled device (CCD) combination-based measurement methods, and the conventional systems have great measurement errors. The photoelectric measurement device for measuring the projectile spatial burst point three-dimensional coordinates consists of a multi-light-curtain backdrop target, a system power supply, a projectile signal acquisition and processing device and a flame detector; the outputs of the multi-light-curtain backdrop target and the flame detector are connected to the signal acquisition and processing device; the multi-light-curtain backdrop target consists of a first backdrop target and a second backdrop target which are the same, the first backdrop target and the second backdrop target form three detection light curtains respectively, and the intersecting lines of the three detection light curtains and a random horizontal plane are 'N'-shaped in the space; and the first backdrop target, the second backdrop target and the flame detector are sequentially placed along the trajectory direction. The measurement principle is simple; the instruments are simple and convenient to place; and the measurement precision is high.

The invention belongs to the distributed fiber sensing technology, and provides a distributed fiber sensing method and a distributed fiber sensing device for simultaneously measuring temperature and strain. The method comprises the following steps of: calibrating Brillouin frequency shift temperature coefficients and strain coefficients of a sensing fiber to be measured, which correspond to incident light of two different wavelengths; measuring the Brillouin frequency shift quantity of the sensing fiber in the two different wavelengths; and calculating the temperature and strain distribution of the sensing fiber. Specifically, the incident light of the two different wavelengths can be sequentially and separately injected into the sensing fiber during measurement, and can also be simultaneously injected into the sensing fiber through a wavelength division multiplexer. By adopting the common single mode fiber, the cost is low and long-distance distributed sensing can be realized; and only the Brillouin frequency shift quantity in different pumping wavelengths is required to be measured, so that the measurement precision is effectively improved, and the structure of the system is relatively simple.

The invention discloses a total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement and belongs to the technical field of big-size three-dimensional coordinate measurement in the industrial scene. The method comprises the following steps that a lunching base station and a receiver are built; the position of an ultrasound lunching module on the lunching base station is calibrated; the positions of a first ultrasound receiving module and a second ultrasound receiving module on the receiver are calibrated; the horizontal angle alpha and the pitch angle beta of a photodiode are measured with a photoelectric scanning method; through an ultrasound distance measurement method, the distance between the first ultrasound receiving module and the ultrasound lunching module and the distance between the second ultrasound receiving module and the ultrasound lunching module are measured; and the space coordinate of the photodiode is calculated. According to the total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement, the total-station spatial measuring and positioning is realized only by a single lunching base station under certain specific working environment, the measurement principle is simple, and various requirements in the practical application are satisfied.

The invention discloses a non-contact wheel set dimension online detection method and device based on various sensors. The device comprises the two laser displacement sensors symmetrically arranged on the inner side and the outer side of a track, and the two eddy current displacement sensors arranged on the inner side of the tract. The method comprises the steps that the two laser displacement sensors detect and obtain tread contour lines, and the rim height and the rim thickness are calculated through the extracted tread contour lines according to the geometric relation; the two eddy current displacement sensors are used for detecting the distances to the vertexes of the rims in the vertical direction, measurement data of the three sensors on the inner side of the track are extracted at the moment when wheels pass through the effective measurement range of the eddy current displacement sensors and the laser displacement sensors on the inner side of the rack simultaneously, the diameters of the vertex circles of the rims are calculated according to the measurement data and the geometric relation, and then the diameters of the wheels are calculated according to the wheel rim height. The non-contact wheel set dimension online detection method and device based on various sensors have the advantages that the measurement principle is simple and practical, cost is low, and precision is high; non-contact and real-time measurement can be achieved.

The invention discloses a dynamic measuring method of lubricating films of a sliding bearing, and an optical fiber sensor that is used for measurement. Two reflection-typed optical fiber sensors with coaxial double loops that form a right angle are respectively arranged at the two end faces of a bearing bush of the sliding bearing, two distances from A to A' and from B to B' are directly measured, the coordinates of the two points A' and B' that are obtained by measurement and calculation are substituted into a standard circle equation of a shaft neck so as to calculate the values of x and y of a cross section circle of the shaft neck, and consequently, the eccentric offset of the shaft neck, the smallest oil film thickness h<min>, the position angle of the smallest oil film thickness Theta<min> and the thickness of the oil films on any point along the circumferential direction of the sliding bearing h(Theta) are obtained in order; in order to implement subsequent failure diagnosis, the multi-dimensional features of the lubricating films of the sliding bearing are represented and extracted. The optical fiber sensor that is used in the dynamic measuring method comprises an optical fiber probe, an incident optical fiber and a receiving optical fiber beam, and is characterized in that two loops of receiving optical fiber beams including an inner loop and an outer loop are arranged closely and coaxially surrounding the incident optical fiber.

The invention discloses a two-dimensional reflection type supersonic wave wind speed anemoscope and a measuring method. The wind speed anemoscope comprises a control unit, a data processing unit, a wind speed and wind direction measuring unit, a direction calibration unit, a temperature compensation unit and an air pressure compensation unit. The wind speed and wind direction measuring unit is composed of a supersonic wave emitter, a supersonic wave receiver and a timer module; the direction calibration unit is composed of a digital compass and a magnetosensitive diode; the temperature compensation unit is composed of a temperature detection module and a heating module; and the air pressure compensation unit is composed of an air pressure sensor and a data acquisition module. According to the invention, one integrated ultrasonic sensor is employed for emission, one of echo signals is received, four receiving sensors receive and reflect the echo signals, the five sensors are arranged on the same horizontal plane, a wind speed and a wind direction can be calculated simply by use of a time difference between emission and receiving once, the measuring principle is simple, the measuring precision is improved, the service life of the instrument is prolonged, and the anemoscope and the method are suitable for various severe measuring environments.

The invention discloses an online detection method for the diameters of wheels of an urban rail vehicle based on laser displacement sensors. The online detection method comprises the following steps: sequentially arranging a first laser displacement sensor, a second laser displacement sensor and a third laser displacement sensor on the inner side of a rail along the movement direction of a vehicle; setting a fourth laser displacement sensor on the outer side of the rail to be symmetrical to the third laser displacement sensor; carrying out coordinate conversion on detection point coordinates obtained by simultaneously detecting the wheels by the four laser displacement sensors; fusing the detection data, subjected to the coordinate conversion, of the third laser displacement sensor and the fourth laser displacement sensor on the same coordinate system to obtain a complete tread contour line; extracting a right end face of a tread according to the data subjected to the coordinate conversion and determining a transverse coordinate of the right end face of the tread; and after carrying out segmentation fitting on a tread curve, extracting tread standard point coordinates measured by the first laser displacement sensor, the second laser displacement sensor and the third laser displacement sensor respectively according to the transverse coordinate value of the right end face of the tread and obtaining the diameters of the wheels. According to the online detection method, structure arrangement is convenient, a system is stable and a measurement principle is simple; and high-precision online non-contact type measurement can be carried out.

The invention relates to the field of design and manufacturing of force sensors and particularly relates to an orthogonal decoupling six-dimensional force sensor. The orthogonal decoupling six-dimensional force sensor comprises a fixed platform, a force measuring platform, detection branches and a strain gage, wherein the fixed platform and the force measuring platform are arranged in a parallel state; a set of detection branches at the vertical state are arranged between the fixed platform and the force measuring platform; each of the fixed platform and the force measuring platform is of a circular-disc-shaped structure; the center of the force measuring platform is provided with a quadrilateral through hole and the quadrilateral through hole is internally provided with a stand column; the other end of the stand column is connected with the fixed platform; the stand column is provided with a set of detection branches at the horizontal state; the other end of the detection branch at the horizontal state is connected with a hole wall of the quadrilateral through hole. The orthogonal decoupling six-dimensional force sensor has the following advantages of simple structure, simple and convenient measurement principle and great whole rigidity; all the detection braches are distributed in parallel or vertically so as to realize decoupling measurement on six-dimensional outer forces.

The invention discloses a three-dimensional ultrasonic wind speed and wind direction detection system and a measurement method. The detection system comprises a mounting base, a plurality of measurement arms, ultrasonic probes and a control and processing circuit board, wherein the quantity of the ultrasonic probes is equal to that of the measurement arms; one measurement arm is fixed to the center of the top surface of the mounting base, and the remaining measurement arms are arranged on the circumference of the top surface of the mounting base in a surrounding mode; the ultrasonic probes are arranged at the top ends of the measurement arms; the control and processing circuit board is arranged in the mounting base, is connected with the ultrasonic probes and controls the ultrasonic probes to work. The measurement method comprises the first step that all modules are initialized through a control and data processing module; the second step that a wind speed component V1 can be obtained according to transmission time t1 and t4 by the adoption of an indirect time difference method; the third step that three-dimensional wind speed values and wind direction values are obtained; the fourth step that real-time three-dimensional wind speed and wind direction are obtained. The three-dimensional ultrasonic wind speed and wind direction detection system and the measurement method have the advantages that received signals are stable; the instrument cost is greatly lowered; measurement accuracy is high, and real-time performance is good.

The invention discloses a contactless vehicle wheel diameter dynamical measuring device and a contactless vehicle wheel diameter dynamical measuring method in the technical field of a contactless vehicle wheel diameter dynamical measuring. The measuring device is formed by vehicle wheel positioning units, each vehicle wheel positioning unit is composed of a laser displacement sensor and two vortex flow transducers, wherein the vehicle wheel positioning units composed of the laser displacement sensors and the vortex flow transducers are arranged along a steel rail direction. The laser displacement sensor can be used for simultaneously measuring the distances between the corresponding points on the tread of a vehicle wheel which are sensed by each sensor. Meanwhile, the vortex flow transducer can be used for detecting the distance between a vertical direction and the tread of the vehicle wheel; when the distances detected by two vortex flow transducers are same, the lowest point of the circumference of the vehicle wheel passes the middle part of the two vortex flow transducers, then the distance reading on the laser displacement sensor is recorded; thus the diameter of the vehicle wheel of a train is calculated. According to the invention, not more than three sensors are adopted, and the measuring principle is simple and practical.

The invention provides a device and method for measuring the interface of a medium in a container, relating to the technical field of industrial measurement control. According to the device and method disclosed by the invention, the height, the size and / or the weight, and the like of the mixing medium in the container can be monitored conveniently by means of the cooperative use of a radar level gauge and a differential pressure transmitter, the measuring principle is simple, the calculation speed is fast and the method is easy to realize. The device has the advantages of high measurement precision, not high demands on work environment and the measured medium, safety and convenience for operation, and easiness in installation and maintenance, and can effectively solve the problem of difficulty in the measurement of the medium interface in the prior art.

The invention discloses a novel double-channel differential measurement method of an atmospheric aerosol absorption coefficient based on coaxial photo-thermal interference. The method comprises the following steps of: forming interference in a to-be-measured aerosol sample region through modulated carrier laser; designing two channel interference light paths, wherein one channel is used to detect baseline phase drift caused by gradual change of environment temperatures and platform vibration, and the other channel is used to detect the total phase change caused by excitation laser absorption of aerosol and the baseline phase drift; performing differential to obtain phase variable caused by aerosol absorption; and detecting the aerosol absorption coefficient on line on the basis of interference amplification factor calibration. The method provided by the invention can be also used for detecting the concentration of specific aerosol ingredients according to fingerprint absorption characteristics. The method provided by the invention overcomes the effect of environmental temperature change and measuring platform vibration, cancels the adjustment of phase inversion difference point, doubles the acting distance of excitation laser and detection laser and has the characteristics of convenience for operation, high detection speed, easiness for miniaturization, high detection sensitivity, and the like.

The invention discloses a deformation parameter testing test bench for a deformation wing. According to the test bench, a digital infrared distance measurement sensor is utilized for non-contact distance measurement, the displacement values of different positions of the deformation wing are measured and input into a computer, and software is utilized for interpolation to obtain a deformation curveof the test wing; a workpiece is not in contact in the measurement process, and the surface of the workpiece cannot be scratched. Driving force for driving the deformation of the wing is measured bya micro force sensor, an inflatable airbag is utilized for loading aerodynamic load on the deformation wing, feedback is given to a controller, a closed-loop adjusting system is formed to control theapplication of the aerodynamic load, the application process of the aerodynamic load is effectively simulated, and distributed loading is achieved. The test bench is simple in layout structure, shortin measurement time, convenient to operate, assemble, disassemble, detect and maintain and low in cost. By means of the test bench, the measurement time can be effectively shortened, and the measurement efficiency is improved; the test bench has good applicability to tests of small and medium deformation wings.

The invention discloses a torque measurement sensor based on the phase difference of photoelectric encoder signals. The torque measurement sensor comprises a shell; an elastic drive sleeve is mounted in the shell by use of a ball bearing; an elastic link is arranged in the middle part of the elastic drive sleeve; a photoelectric encoder sleeves each of the two ends of the elastic link, and the central angles of the two photoelectric encoders are equal; a mounting base is fixed on the top of the shell; a photoelectric sensor A and a photoelectric second B are fixed in the mounting base, and arranged in opposition to the two photoelectric encoders. The two photoelectric encoders are arranged at the two ends of the elastic link of the elastic drive sleeve and the two photoelectric sensors are used for obtaining square wave output signals when the encoders rotate, and then the measurement of the torsional deformation and torque of the elastic drive sleeve can be realized according to the phase difference of the square wave signals output by the two encoders. The torque measurement sensor based on the phase difference of the photoelectric encoder signals is used for solving the problem that the measurement accuracy of an existing torque sensor is prone to be effected by a magnetic field and an electric field; the torque measurement sensor is simple in measurement principle, high in anti-jamming capability, and capable of realizing high-dynamic and high-accuracy torque measurement of a drive mechanism.

The invention discloses a wheel set size on-line detection method and device based on various sensors. The device comprises the first eddy current displacement sensor, the second eddy current displacement sensor and the second laser displacement sensor which are sequentially arranged on the inner side of a rail in the train heading direction, and comprises the first laser displacement sensor which is arranged on the outer side of the rail, wherein the first laser displacement sensor and the second laser displacement sensor are symmetrical about the rail. The method comprises the steps that the two laser displacement sensors detect and obtain a tread contour line, and a rim height and a rim thickness are worked out according to the geometrical relationship by extracting the tread contour line; the two eddy current displacement sensors are used for detecting the distances between the rim top point and the two eddy current displacement sensors, when the distances detected by the two eddy current displacement sensors are the same, the lowest point on the wheel rim top point circle passes through the middles of the two eddy current displacement sensors, and the wheel diameter is worked by extracting the distance readings on the eddy current displacement sensors and combining the distance readings with the rim height. According to the wheel set size on-line detection method and device, the cost is low, the principle is simple, practicability is high, and non-contact high-precision measurement is achieved.

The invention relates to a material heat conduction analysis device based on a fluorescence method, and belongs to the field of material thermal property analysis. The material heat conduction analysis device comprises a probe (1), a photoelectric module and a data processing module. The probe (1) is used for detecting fluorescence sensing materials (7) on an object to be tested and transmitting detected optical signals to the photoelectric module through optical fibers (2). The photoelectric module coverts the received optical signals into electric signals, and converts the electric signals into temperature signals and then transmits the temperature signals to the data processing module. The data processing module obtains a temperature change curve according to the temperature signals, obtains a thermal diffusion coefficient of the detected object through comparison with standard data, and transmits the thermal diffusion coefficient to an upper computer for heat conduction analysis. The material heat conduction analysis device can be applied to measurement of thermal diffusion coefficients of gas, liquid and solid, is simple in structure, high in flexibility, and has the advantages of being better in measurement accuracy and anti-electromagnetic interference capacity, and achieving functions of miniaturization, intellectualization and online monitoring.

A rotational angle sensor includes a stator element and a rotor element. The stator element has a transmitting coil and at least two receiving coils that are arranged within the transmitting coil and on a circuit board. The rotor element is mounted for rotation with respect to the stator element about an axis of rotation. The rotor element is configured to inductively couple the transmitting coil to the at least two receiving coils in such a way that the inductive coupling is dependent on a rotational angle between the stator element and the rotor element and the transmitting coil induces at least two angle-dependent alternating voltages in the at least two receiving coils. The rotor element and the at least two receiving coils are configured in such a way that an alternating voltage, the amplitude of which is sinusoidally dependent on the rotational angle, is induced in the receiving coils.

A transformer winding material identification method based on a resistance temperature coefficient comprises the steps: firstly, placing a to-be-detected transformer in a 20-100 DEG C high-temperature test box, arranging four temperature measuring points respectively being a top oil temperature point, a winding connector point, a front side bottom point and a back top point at the periphery of the transformer, and determining the temperature of a transformer winding through measuring the temperatures of the four points; then changing the temperature of the high-temperature test box, and after the transformer temperature is completely stable, namely the temperatures of the four temperature measuring points are the same and consistent with the set temperature of the test box, measuring the direct-current resistance of the transformer winding through a transformer direct-current resistance tester; and then carrying out data analysis on the measured direct-current resistance values of the transformer winding at different temperatures. Through measuring the direct-current resistance values of the transformer winding at the different temperatures, the material of the winding is identified from the change condition of the resistance values. The measuring principle is simple, judgment accuracy is high, and no hang cover is needed so as to avoid destroying of insulation of the winding.

The invention discloses a moment-of-inertia test bench based on a torque sensor. A torque motor is adopted to drive a workbench to rotate, the numerical values of a torque sensor and an angular velocity sensor under no-load and loaded conditions of the workbench are collected, and the moment of inertia of a tested object is calculated based on the numerical values. The moment-of-inertia test bench comprises a workbench, a torsion bar transmission mechanism, a driving device and an electric control system. The workbench is used for installing and positioning a tested object, and a special clamping mechanism for design is installed on the workbench. The torsion bar transmission mechanism is used for transmitting torque, and can bear the instantaneous torque when the torque motor is started and ensure that the torque output is stable at the start of test. The torsion bar transmission mechanism employs a torque sensor and an angular velocity sensor, and is easy to disassemble. The torque sensor is connected with a transmission shaft, and has the characteristics of high measurement precision and quick disassembly and calibration. The moment-of-inertia value is calculated by measuring the data of the torque sensor and the angular velocity sensor in the rotation process of the workbench, and the measurement result is of high repeatability.

The invention relates to a device and method for simultaneously measuring beam intensity and beam emittance. The device mainly comprises position sampling slit plates in a horizontal direction and a vertical direction, angle sampling slit plates in a horizontal direction and a vertical direction, and a vacuum system. During the measurement of beam intensity, the intensity of an incident particle beam is obtained according to the sum of the currents received by Faraday cylinders at the position sampling slit plates, the angle sampling slit plates and Faraday cylinders behind the angle samplingslit plates. During the measurement of beam emittance, the position and the divergence angle of the beam are sampled under the driving of a motor, and the beam emittance is measured by measuring the positions of the two slit plates and a current signal received by the angle sampling slit plates. The device is compact in structure, easy to operate and easy to miniaturize, can measure the emittanceof the beam in both the horizontal and vertical directions, can also measure the intensity of the beam, is very suitable for the beam parameter measurement of a low-energy high-intense proton beam.

The invention discloses a non-contact torque measurement device based on a counter-magnetostrictive effect and belongs to sensor measurement technologies. According to technical key points, a measuredrotating shaft is coated with giant magnetostrictive material coating strips, the giant magnetostrictive material coating strips are divided into positive giant magnetostrictive material coating strips and negative giant magnetostrictive material coating strips; the positive giant magnetostrictive material coating strips and negative giant magnetostrictive material coating strips obliquely coat the measured rotating shaft in an axial direction at equal intervals in a bilateral symmetry manner; left and right ends of the measured rotating shaft are respectively nested into inner holes of a left bearing and a right bearing; the left bearing and the right bearing are respectively nested into the left and right ends of a shaft sleeve; an exciting coil is assembled onto the inner wall of the shaft sleeve; a left measuring coil and a right measuring coil of the same specification are assembled in parallel on the inner walls of the exciting coil in the axial direction. According to the measurement device disclosed by the invention, the torque is dynamically measured in real time at high accuracy and high precision without being in contact with a transmission shaft or changing a stress state of the transmission shaft and under rotary and dynamic operating conditions.

The invention relates to a gas-liquid two-phase bubbly liquid viscosity measuring method. The method comprises the following steps: 1, selecting syrup, injecting dry ice particles into the syrup, uniformly stirring, and sublimating the dry ice particles in the syrup to prepare a uniform and stable bubbly flow syrup; and 2, adding the prepared bubbly flow syrup to a transparent solution container, and measuring the viscosity of the syrup by adopting a liquid phase viscosity measuring apparatus. The liquid phase viscosity measuring apparatus comprises a workbench, a rheometer, a laser emitter, a high speed camera and a computer, the solution container is arranged below the rheometer, and the laser emitter and the high speed camera are connected with the computer through a transmission line. The measuring method and the measuring apparatus are simple and are easy to enforce, and can realize the accurate measurement of the transient and average viscosity of the gas-liquid two-phase bubbly flow. The method can be used for measuring and analyzing the rule of the influences of different physical parameter degrees of bubbles on the liquid phase viscosity.

The invention discloses a measuring device and method for shield tunnel segment joint deformation. The device is composed of an anchoring joint, a fixed rod, a transmission rod, a follow-up rotary laser transmitter, an optical screen and other components. According to the basic principle of the device, through reasonable design and arrangement of the rod and the laser transmitter, deformation of segment joints are amplified, and the joints do not affect one another when expanded and staggered. According to the designed measuring device, expansion of the joints enables a laser optical path to turn horizontally, staggering of the joints enables the laser optical path to deflect vertically, corresponding geometric figures are formed before and after change in the laser optical path, and the expansion amount and staggering amount of the joints can be conveniently calculated through the geometric similarity relation. Compared with existing measuring means, by the adoption of the measuring device, deformation of the joints can be measured comprehensively, the measurement precision of joint deformation is greatly improved, and the problem that it is hard to measure joint deformation accurately and comprehensively in practical engineering by existing measuring means is solved.

The invention discloses a laser multi-target vertical target measuring device and measuring method. The device comprises a plurality of detecting light curtain units and a power supplying and signal processing unit. Each detecting light curtain unit is correspondingly composed of a laser, a photoelectric detecting array and a narrowband filter. The lasers and the photoelectric detecting arrays are in one-to-one correspondence and form a plurality of detecting light curtain surfaces. A plurality of narrowband filters are located at one side, close to the lasers, of the plurality of photoelectric detecting arrays. The method comprises the steps of: processing signals of projectile projection output by the plurality of photoelectric detecting arrays, recognizing the position of the projectile projection, and solving a projectile landing coordinate according to a coordinate measuring model of the measuring device. The laser multi-target vertical target measuring device and measuring method have the advantages that the coordinate measurement in the case of any number of projectiles landing simultaneously is realized without a high speed camera, the anti-interference capability is high, the measuring theory is simple, the manufacturing cost is low, the application range is wide, and the device can be used both indoors and outdoors.

The present invention discloses a high-precision digital phase measurement method based on a quadrature phase demodulation technology. The method comprises the following steps of: (1) performing datasampling of signals to be measured to obtain digital signals; (2) constructing first reference signals and second signals according to the digital signals, and respectively multiplying by digital signals, performing filtering of the signals after multiplying to allow the signals to only retain difference frequency items, and dividing the two signals after filtering, performing solution of an arc tangent or arc cotangent to obtain phase values of the signals after division; and performing phase unwrapping and removal of linear drift to obtain phase data of the signals to be measured. The wholeflow arrangement, the key steps and the concrete processing process of the measurement method are improved to achieve a high-precision digital measurement method with more convenient parameter regulation and simpler implementation of the phase measurement principle and system and a corresponding system so as to effectively solve the phase measurement precision problem in the scientific research such as precision measurement.

The invention relates to a method for automatically accumulating the conveying capacity in a powdered coal conveying process, which comprises the following steps that: a powdered coal conveying tank, a feed valve and a material conveying valve are used, a weighing sensor is arranged below each supporting leg of the powdered coal conveying tank, and a signal which is generated by the weighing sensor and has certain functional relation with the weight of the tank is transmitted to a weighing control display and is then converted into a standard direct current signal of 4 to 20 mA which is transmitted to a distributed control system through a signal cable; the distributed control system configures out two recorders, and the actions of the feed valve and the material conveying valve trigger the two recorders respectively; the recorders record the tank weight value when the feeding is finished and the tank weigh value when the material conveying is finished, subtract the two tank weight values to obtain the single-time conveying capacity, and perform superposition operations through an addition arithmetic unit to finally obtain the accumulated conveying capacity of the powdered coal. The method has high metering accuracy and few interference factors, can effectively relieve the problem of zero drift of an instrument and reduce the construction investment, and has high automatic degree and less maintenance workload.

The invention provides a piezoelectric ceramic tube scanner nonlinear correcting method, able to effectively eliminate scanned picture distortion when scanning pictures by using piezoelectric ceramic tube, thus beneficial to obtain real scanned pictures of actual surface appearance of an object. Its technical project is a nonlinear correcting method for piezoelectric ceramic tube scanner, and its character: (1) adopting micrometer to measure a series of corresponding data between the stroke and driving voltage of the piezoelectric ceramic tube; (2) it fits the curve made by these data into a stroke-driving voltage relationship curve.

The invention relates to an optical fiber hot-wire type wind gage based on a tilted fiber bragg grating which uses wavelength demodulation method to achieve wind power measurement and solves problems that an ordinary optical fiber sensor is complex in structure and high in cost. The optical fiber hot-wire type wind gage based on a tilted fiber bragg grating is capable of enabling pump light source to enter a wind gage through a wavelength division multiplexer, being coupled into a cladding of a cladding mode of the tilted fiber bragg grating, heating a metallic film plated on the surface, raising temperature of the optical fiber to cause redshift of wavelength of the tilted fiber bragg grating, lowering the temperature of the optical fiber by wind to cause blueshift of wavelength of the tilted fiber bragg grating, and obtaining information related to the wind power through wavelength measurement by broadband light source and a spectrometer. The optical fiber hot-wire type wind gage based on the tilted fiber bragg grating is small in size, simple in structure, low in cost, strong in operability, and capable of being widely used in various wind monitoring fields.