42results about How to "Accurate displacement measurement" patented technology

A laser displacement measurement system including a radiation source for transmitting radiation to a target, an R.F. transmitter oscillator for modulating the amplitude of the radiation at a first frequency, a detector for sensing the radiation reflected from the target, an R.F. local oscillator for providing an R.F. signal at a second frequency, a first mixer circuit, responsive to the oscillators for providing a local I.F. signal which is the difference between the first and second frequencies, a second mixer circuit, responsive to the detector and the R.F. local oscillator, for providing a reflected I.F. signal which is the difference between the second frequency and the modulation frequency of the reflected radiation, and a phase detector, responsive to the local and reflected I.F. signals, for detecting a first phase difference between the signals representative of the distance of the target.

The invention relates to a bidirectional micro motion test fixture and a bidirectional micro motion test method thereof. The fixture is mainly in the structure that: a planar test-piece fixture (2) is in an inversed V shape, the opposite surfaces of the left and right sides of the lower part are all opened with a groove (4) fit to a planar test-piece (13), and the wall of the groove (4) is provided with a puller screw (3); a spherical test-piece fixture (8) is opened with a spherical test-piece cavity (7) fit to a spherical test-piece (5), and the wall of the spherical test-piece cavity (7) is provided with a puller screw (6); and the vertical axes of the spherical test-piece cavity (7), a piston (9) and the planar test-piece fixture (2) are coincided. One side of the upper part of the planar test-piece fixture (2) is connected with an upper vertical screw (10) while the spherical test-piece fixture (8) is connected with a lower vertical screw (12), and a displacement sensor is connected with the upper vertical screw (10) and the lower vertical screw (12). The test fixture can effectively simulate bidirectional fretting under spherical / surface contact condition, test tribology properties and estimate contact fatigue life of a coating under spherical / surface bidirectional micro motion condition on the existing hydraulic servo micro motion test platform.

The invention belongs to bridge construction, and particularly relates to dynamic real-time monitoring method for concrete bridge prestressed tendon tensioning force and a special prestress construction system. The dynamic real-time monitoring method for the concrete bridge prestressed tendon tensioning force includes the steps of initializing and real-time dynamic control loading. The prestress construction system comprises at least one tensioning device, and each tensioning device comprises a hydraulic station, a reversing valve bank, a jack, an A / D data collecting module, a PLC, a central processing unit, a human-computer interface, a direct force measuring device, a hydraulic force measuring device, a prestressed tendon elongation measuring device, a friction resistance test device and a security alarm device. The double-control requirement, difficult to met in the prior art, for taking stress control as the principle thing and an elongation value as a checking item is met, the dynamic real-time monitoring method has the advantages that construction quality and safety can be effectively ensured, and problems found in the tensioning process can be solved in time.

The invention discloses a wide range fiber grating displacement sensor capable of adjusting a measuring range and precision, comprising fiber gratings, a spring and a rectangle housing; the adaptive position on the inner wall of the housing is fixedly connected to a support plate; the middle portion of the free end of the support plate is provided with a groove; the top end of the groove is provided with a sleeve sleeving a rotation shaft; an eccentric point of a gear passes through the middle portion of a rotation shaft and is integrated with the rotation shaft; the lower end of the gear is meshed with a spline fixed on a support rod on the lower part of the housing; one end of the spline is fixedly connected to the measurement rod; the measurement rod passes through and is projected out of the side wall of the adjacent housing and is in contact with a measured structure; the other end of the spline is connected to the side wall of the housing of the other end through a spring which is fixedly connected in parallel; and the two fiber gratings are symmetrically arranged on the upper surface and the lower surface of the support plate. The wide range fiber grating displacement sensor solves the problem that the current fiber grating displacement sensor is small in the measuring range, and is simple in operation, stable in performance, reliable, and high in accuracy and is the first choice for health monitoring of various construction structures.

The invention provides a mining roof plate absciss layer warning instrument and a measuring method, belonging to the filed of automatic measurement of mine. A mechanical device is mounted on a common anchor rod exposed out of a roof plate to directly replace an anchor rod screw cap and a gasket; the subsidence of the roof plate or the movement of the agsciss layer directly acts on a indicating dial, and the mechanical device transforms the displacement into rotation of a pointer for direct indication; the cup-shaped indicating dial (2) is sleeved outside a roof plate screw cap (1); one end of an irregular spiral steel band (3) penetrates through the cap-shaped indicating dial (2) to be fixed on one end of the roof plate screw cap (1), and the other end is screwed into a measuring handle (5) and penetrates through a pressure spring (4) to be connected with and fixed to a stop block (6) arranged in the measuring handle (5); a pointer (9) is fixed on a pointer seat (8); and the pointer seat (8) is tightly locked on the end part of the measuring handle (5) by a fixing jackscrew (10). The mining roof plate absciss layer warning instrument is mainly used for measurement and early warning of roof plate collapse in a mine and coal mine tunnel and on an extraction coal face.

A resilience and displacement measuring device is disclosed, which is configured with a shaft having a displacement detection module and a force detection module disposed respectively at the two ends thereof. When the shaft is moved for driving a probe of the force detection module to press on a tested press-key, a reflective panel in the displacement detection module will be caused to displace along with the moving of the shaft for allowing a light sensor to measure the displacement of the shaft, and the same time that the pressing of the probe on the press-key will force a detection film to deform for allowing a stain gauge to measure a resilience. The device is capable of dividing a measurement range into a plurality of sub-ranges while designing calculation models specifically for the sub-ranges, by that a precise distance can be obtained from the measured distance information of calculation models.

The invention discloses a ship sea-keeping test device, which is arranged on a ship model and used for testing seakeeping performance of the ship model. The ship sea-keeping test device comprises a horizontal cross bar, a vertical stand bar arranged vertically to the horizontal cross bar, a vertical sleeve sleeving the upper end of the vertical stand bar, stop plates arranged at the two ends of the horizontal cross bars, and two installation bases for supporting and mounting the horizontal cross bars. The bottom end of the vertical stand bar is fixedly connected to the upper surface in the middle of the horizontal cross bar; and the axial two ends of the horizontal cross bar pass through the installation bases and abut against the outer walls of the stop plates, and are fixedly connected through bolts respectively. The vertical sleeve sleeves the upper end of the vertical stand bar, so that when the ship model heaves, the vertical stand bar moves up and down; and when the ship model heaves, vertical displacement is not limited in the vertical direction, so that too much forced limit of the ship model is not needed, and accuracy of the displacement data, measured in the wave, of the ship model is high.

The present disclosure relates to a macro-micro composite grating ruler measuring system based on conversion and amplification in vertical and horizontal directions. The macro-micro composite grating ruler includes a grating ruler, a macro-micro reading system moving with respect to the grating ruler, and a counting and image processing module. The macro-micro reading system faces grating strip datum and is parallel to the grating ruler. The system further includes a measuring reference line. The measuring reference line obtained by the image sensor together with grating strips forms an image overlap in the counting and image processing module. The measuring reference line and the grating strip jointly include an angle θ. With the foregoing configuration, the present invention is compatible with the existing incremental grating rulers and absolute grating rulers, so is highly applicable.

The invention discloses a laser displacement sensor based on a photosensitive array. The laser displacement sensor comprises (1) a photosensitive array circuit which realizes measurement of laser light spots and conversion of the center of the laser light spots and displacement change; (2) a charging voltage-stabilizing circuit which realizes power supply of a lithium battery and is capable of cycle charging; (3) and a communication circuit which realizes communication with an aggregation node. 0805 or other packaging photosensitive elements are adopted so that distance between detection points is effectively reduced, resolution is enhanced and detection displacement is enabled to be more precise. A time sharing multiplexing ADC design is adopted so that cost of the sensor is effectively reduced and extendibility of the sensor is enhanced. Environment light intensity is measured firstly and then the laser light spots are measured by the sensor so that anti-interference capability and sensitivity of the sensor are enhanced. The sampled data and results are transmitted via a 433MHz waveband wireless local area data network so that networking and cluster work of the sensor can be facilitated. The high-capacity polymer lithium battery with a protective plate is adopted so that endurance capacity and safety and reliability of the sensor can be enhanced.

The invention provides a method for measuring irregular objects on the bag loading platform of cross-belt sorter. The bag loading platform comprises a measuring light curtain, a light curtain controller, and a programmable logic controller (PLC). The measuring light curtain and the light curtain controller are connected through a power cable. The programmable logic controller is connected with the light curtain controller through an RS485 junction manner and communicates under a free port communication protocol. According to the invention, in order to make irregular objects drop completely in the outer edge of a cart, and to reduce the requirements on the positions of the objects by manual placement through the bag loading platform and on the package appearance of the objects onto the bag loading platform, a mathematical modeling process is carried out for the object testing manner with the introduction of analytic geometric operations to develop a mature measuring method for the sizes and positions of irregular objects, which improves the accuracy of loading bags and reduces the wrong packet rate while improving the suitability of the bag loading platform and reducing the labor intensity of the operation men.

There is provided a contact displacement meter in which the size of the housing can be miniaturized as much as possible without lowering the measurement accuracy of a displacement. Light emitted by a light emitting element is converted to parallel light by a lens, and then is deflected to a predetermined direction and converted to wide-width parallel light by a prism. The displacement of a contact attached with one of a plate-shaped scale member and a linear sensor is calculated from a projection position of a reference pattern and the unique information obtained based on a plurality of received light signals of the linear sensor.

The invention discloses an automatic measuring device based on a laser reference plane, which comprises a laser emitting end arranged at a reference point and a laser receiving end arranged at a to-be-measured point, wherein the laser emitting end emits a surface laser signal at the reference point, the laser receiving end intersects with the surface laser signal at the to-be-measured point, and the laser receiving end is used for analyzing a laser signal and sending an analysis result to the laser emitting end. The device can accurately measure the displacement and achieve large-scale synchronous data acquisition on a target in a large range.

The invention discloses a magnetostrictive displacement sensor suitable for a large temperature range / high temperature environment. The sensor comprises a pulse generating circuit, a constant elasticdevice, a detecting coil, a control sampling module, a magnetostrictive waveguide wire, a casing, a thermocouple, a waveguide wire insulating sleeve and a material level mark. A left side of the casing is a component bin, a right side of the casing is a hollow pipe, and the component bin and the hollow pine communicate with each other and have the same center axis. The magnetostrictive waveguide wire is Fe-Ga or Fe-Co material. The waveguide wire is fixed in the sensor casing. The detection coil sleeves a left side of the waveguide wire. The material level mark sleeves a right end of the casing. A magnetic material of the sensor obtained by the invention has a higher Curie temperature, and the novel displacement sensor can be applied to a high-temperature environment below 500 DEG C.

A scale base is fixed to a base in a plurality of locations which are aligned in a measuring direction (a Y direction) in which measurement by a scale is carried out, slits are provided in the scale base in positions lying between the locations where the scale base is fixed to the base, the scale is supported by the scale base in two or more of the locations where the scale base is fixed to the base, and the scale base has gaps between the base and the scale base in positions other than the locations where the scale base is fixed to the base and between the scale and the scale base in the positions other than the locations where the scale base is fixed to the base.

The invention discloses a displacement measurement method and device, an inclinometer and a computer storage medium. The method comprises the following steps: acquiring two pieces of inclination angledata and two pieces of direction angle data obtained when an inclination angle sensor and a magnetoresistive sensor on the inclinometer perform measurement along a first direction and a second direction respectively for each measurement position in a plurality of measurement positions of an inclinometer tube; determining the inclination length of a section of inclinometer pipe corresponding to the corresponding measurement position in a first coordinate system according to the obtained two inclination angle data; determining a direction angle of a section of inclinometer pipe corresponding tothe corresponding measurement position in a first coordinate system according to the two obtained inclination angle data and the two obtained direction angle data; and determining the displacement value of the inclinometer pipe according to the inclination length and the direction angle corresponding to each section of inclinometer pipe.

The invention discloses a precise-displacement non-contact hydraulic cylinder. The precise-displacement non-contact hydraulic cylinder comprises a cylinder barrel, and a piston rod and a piston entering the cylinder barrel through a cylinder cover, a hollow hole passage is formed in the center of the piston rod, a position magnet is arranged at the head face, and the position magnet is isolated from the piston rod through a nonmagnetic gasket; a digital sensor is arranged at the bottom of the cylinder barrel, the digital sensor is provided with a displacement induction rod, the displacement induction rod enters the hollow hole passage, and the displacement induction rod and the hollow hole passage can generate non-contact axial relative displacement along with the move of the piston. Compared with the prior art, the precise-displacement non-contact hydraulic cylinder uses a built-in non-contact sensor instead of an original contact sensor and external displacement sensor, the oil cylinder uses zero-friction mounting, and the oil cylinder displacement is measured through the non-contact position magnet; the precise-displacement non-contact hydraulic cylinder has advantages of simple technique, precise displacement measuring and long service life.

The invention provides a camera base. The camera base comprises a base body and a grating scale arranged on the base body, wherein the grating scale comprises a scale grating and a grating reading head; the base body comprises an upper turntable and a lower fixed base; the scale grating is annularly arranged at the joint of the turntable and the fixed base; the fixed base is connected with the scale grating; the turntable is connected with the grating reading head. The camera base has the beneficial effects that the movement displacement of the base in an annular range can be obtained by arranging the annular scale grating and cooperating with the grating reading head; the rotational angle of the base can be calculated via the annular movement displacement obtained by the grating scale, and the initial position of the base can be easily obtained by combining the rotational angle with the current angle of the base.

The invention relates to a system and apparatus for providing real-time wavelength correction for a laser displacement interferometer. The apparatus comprises a diffraction type grating, a focusing lens, and a laser spot position sensor. The diffraction type grating is used for generating a specific diffraction angle for laser light with a specific wavelength according to an optical diffraction principle; a combination unit of the focusing lens and the position sensor is used for sensing a diffraction angle change being a real-time changing value based on the environmental factor influence on the laser wavelength, thereby providing real-time correction of the actual wavelength value. The system having real-time self-wavelength-correction function has advantages of simple structure and low cost and is suitable for any laser displacement interferometer. A laser diode can be used as a light source, thereby reducing the overall dimension of the laser displacement interferometer; and the system is suitable for a displacement sensor as a short-stroke nanometer positioning platform.

The invention belongs to the technical field of robots, and particularly relates to a robot capable of automatically working according to a planned path and a displacement measuring mechanism thereof. The displacement measuring mechanism comprises a meter counter and an elastic connecting assembly. The meter counter comprises a follower wheel rotating along with movement of the robot body. The elastic connecting assembly comprises an elastic connecting piece, wherein the first end of the elastic connecting piece is connected to the robot body, and the follower wheel is rotationally connected to the second end of the elastic connecting piece. The elastic connecting piece elastically stretches out and draws back in the direction perpendicular to the moving direction of the robot body, so that the follower wheel is tightly attached to the working face when rotating along with moving of the robot body. The meter counter is adopted to detect the displacement length of the robot body, the meter counter has every high detection precision, and accurate measurement of the displacement of the robot body can be achieved. Besides, the elastic connecting assembly is arranged to ensure that the follower wheel of the meter counter is always attached to the working face, the robot body moves, the follower wheel rotates synchronously, the synchronism is high, and therefore it can be ensured that detection is complete and errorless.

The present invention relates to a method and apparatus for measuring precise high speed displacement, and more particularly, to a method and apparatus for measuring precise high speed displacement, which measures displacement of a test specimen by using a uniform intensity laser line and by using differences in a laser transmission amount according to the deformation of the test specimen, and measures a strain rate of the test specimen such as high strength fiber or the like using a high speed tensile test.

The invention aims to provide a novel sensing grid for displacement measurement and a working method thereof. The technical scheme of the invention is that the novel sensing grid is formed by a measuring head structure and a sensing grating ruler structure, the measuring head structure can horizontally move on the sensing grating ruler structure, the measuring head structure is provided with a primary coil, four secondary coils and a reference coil, the four secondary coils are horizontally and uniformly distributed on an inner side of the primary coil at equal intervals, the sensing grating ruler structure is provided with a plurality of sensing gaps and a reference gap, a whole sensor is based on the inductance principle of a transformer, through the redesign of structures of the primarycoil and the secondary coils, precise displacement information and data can be obtained by using a periodic change caused by magnetic lines of force generated by the coils, the anti-interference capability and the signal quality of a signal are improved in cooperation with a high-frequency exciting current in the aspect of a circuit, the defects that a traditional optical grating has poor anti-pollution capability and the impact resistance and vibration resistance cannot be achieved are overcome, and the precise displacement measurement is realized.

The invention provides a plane cord angular displacement sensor which comprises a rotor and a stator. The stator adopts cord plane winds, three-phase winds of A, B and C are arranged at the interval of 2t / 3 in space to serve as sensing winds, and each phase of wind is formed by a plurality of conducting winds with the root pole interval as t. The rotor adopts single phase winds which are formed by connecting rectangular plan winds with the same pole interval in a series mode, and the single phase winds serve as excitation winds. By means of an excitation magnetic field produced by the excitation winds of the rotor, three-phase induced electromotive force signals with the phases at the interval of 120 degrees and being in an accurate function relation with displacement are generated on the sensing winds of the stator in a sensing mode. The plane cord angular displacement sensor can improve counter pole number, improves sensing signal quality, and improves displacement measurement precision from a source.