613results about "Electrical/magnetic diameter measurements" patented technology

The present invention is directed to automated apparatuses and methods for measuring fastener hole depth, fastener length, countersink depth and/or hole diameters in a workpiece (or other object) in an automated and extremely rapid, efficient and accurate manner. The apparatuses may be operably connected with a power source and with one or a plurality of computers or other data collection devices to transmit fastener hole depth, countersink depth and/or hole diameter measurement data and/or information to them each time that a fastener hole is measured, while the apparatus is continuously measuring fastener holes (i.e., with no interruptions). Extremely advantageously, using only one hand, and by only squeezing a trigger only one time, an operator of such an apparatus may successfully and very rapidly and accurately perform more than one, or all three, of the following functions: (i) normalize the apparatus relative to one or a plurality of fastener holes and/or workpiece surfaces; (ii) make one or a plurality of accurate measurements; and (iii) transmit the one or more measurements from the apparatus to one or a plurality of computers and/or other data collection devices for, for example, recordation, storage, manipulation, other use and/or the like.

A downhole caliper instrument utilizing a magneto resistive sensor to determine the position of a caliper arm which extends to touch the surface of the borehole wall.

A system and method for measuring the threaded surface of an internally threaded component is provided, where the inspection system includes at least one measuring probe, wherein the at least one measuring probe includes an emitter and a receiver and is sized and shaped to be positionable adjacent at least a portion of the threaded surface at an offset distance, wherein the emitter is configured to emit electromagnetic energy that is incident upon the threaded surface to generate reflected electromagnetic energy responsive to the threaded surface and wherein the receiver is configured to receive at least a portion of the reflected electromagnetic energy and generate threaded surface data. A processing device is also provided, wherein the processing device is in signal communication with the measuring probe to receive the threaded surface data and process the threaded surface data to determine physical characteristics of the threaded surface.

A system is provided for communicating between a 3D metrology instrument and a portable computing device via near field communications. In one embodiment, the metrology device is an articulated coordinate measurement machine (AACMM), a laser tracker, a laser scanner or a triangulation scanner, and the portable communications device is a cellular phone or a tablet. The portable device may use the NFC to determine the configuration of and to configure the metrology instrument.

The invention discloses an inner diameter multiparameter measuring device for a large length-to-diameter ratio pipe which is characterized by comprising a measuring table, wherein both ends of the measuring table are respectively provided with a clamping device and a measuring mechanism for the pipe; the measuring mechanism comprises a guide rail arranged on one end of the measuring table; the inside of the guide rail is horizontally provided with a handwheel-driven screw; the guide rail is matched with a screw-driven slide block which can horizontally slide along the guide rail; the slide block is detachably connected with a clamping lever which extends towards the clamping device; the end part of the clamping lever is provided with a sensor; the pipe is horizontally fixed and clamped by the clamping device; and the axial line of the pipe is perpendicular to the axial line of the sensor. The inner diameter multiparameter measuring device for a large length-to-diameter ratio pipe in the invention can be used for simultaneously measuring the inner diameter, circular degree and straightness of the measured pipe. The measuring head of the sensor can reach any cross section in the measured space to carry out the measurement without dead points for measurement.

The method electromagnetically measures a pipe inner diameter ID and a pipe ratio of magnetic permeability to electrical conductivity μ₂/σ₂ by means of a measuring arrangement 1 comprising a transmitter coil 2 and a receiver coil 3, both coils being coaxial to and longitudinally spaced from each other, the measuring arrangement 1 being adapted to be positioned into the pipe CS and displaced through the pipe. The method comprises the steps of:

• • a1) exciting the transmitter coil 2 by means of a transmitter current I_i, the transmitter current having a first excitation frequency f₁,
  • a2) measuring a receiver voltage V_i at the receiver coil 3,
  • a3) determining a transimpedance V_i/I_i between the transmitter coil 2 and the receiver coil 3 based on the transmitter current I_i and the receiver voltage V_i, and determining a measurement ratio M_i based on said transimpedance,
  • b) repeating the excitation step a1), the measuring step a2), the transimpedance and the measurement ratio determination step a3) for at least a second excitation frequency f₂ so as to define a measurement ratio vector [M₁, M₂, . . . M_n],
  • c) calculating a prediction function vector [G₁, G₂, . . . G_n] based on the first and at least the second excitation frequency, a plurality of potential pipe ratio of magnetic permeability to electrical conductivity and a plurality of potential pipe inner diameter ID, and
  • d) applying a minimizing algorithm onto the measurement ratio vector [M₁, M₂, . . . M_n] and the prediction function vector [G₁, G₂, . . . G_n] and determining the pipe inner diameter and the pipe ratio of magnetic permeability to electrical conductivity corresponding to a maximum solution of the algorithm.

A reference fixture (20) for a roundness measuring instrument performs acquisition of origin information of a roundness measuring instrument (1) including a workpiece rotary mechanism (3) on which a workpiece is set and a probe (14) provided with a stylus (14a) and also performs calibration of the probe (14). The reference fixture (20) includes a mount (21), a calibration master (22) provided on a top face of the mount (21) for calibrating the sensitivity of the probe (14), an origin ball (23) disposed above the calibration master (22) for providing the origin information of the roundness measuring instrument (1) by the stylus (14a) of the probe (14), and a holder (25) that holds the origin ball (23).

The real-time dot welding molten kernel detecting method includes the following steps: performing several point welding with welded sample in the same thickness as the welded part, and measurement and calculation to obtain the dynamic resistance curve of each point; further obtaining the quasi-stable state resistances rD of each point; splitting the welded sample along the joint surface, measuring the molten kernel diameter dK of each welded point, and drawing the rD vs dK curve; storing rD vs dK curves of different material thickness in computer system; and comparing the practical molten kernel diameter with the set standard value to judge welding quality.

The invention discloses a bearing inner ring diameter detection device and a detection method thereof, and belongs to the technical field of bearing inner ring detection. The bearing inner ring diameter detection device comprises a base, and feed mechanisms, transfer mechanisms, detection mechanisms and discharge mechanisms which are mounted on the base, as well as a control unit, wherein the feed mechanisms are mounted on the side edges of transfer mechanism conveying belts; the detection mechanisms are mounted on the side edges of transfer mechanism displacement sheets; the discharge mechanisms are located below the displacement sheets; to-be-detected bearing inner rings on the feed mechanisms are conveyed to the detection mechanisms by the conveying belts and the displacement sheets, and displaced to the discharge mechanisms by the displacement sheets after detection; the displacement sheets are displaced by expansion of piston rods of station clamping air cylinders and station pushing air cylinders which are connected with the displacement sheets; and the control unit is connected with the feed mechanisms, the transfer mechanisms, the detection mechanisms and the discharge mechanisms respectively by signal lines.

A method of monitoring the relative effective diameters of the tires and compensating therefor in a vehicle which includes a front driveshaft for transferring motive power to a front set of wheels and a rear driveshaft for transferring motive power to a rear set of wheels, each of the wheels having an effective diameter. Front and rear driveshaft values indicative of the rotational speed of each driveshaft are generated. A difference value indicative of a difference between said front and rear driveshaft values is then generated. A low pass filtered value is generated according to the relationship of Y1p=(1- beta )*U(k)+ beta *Y1p(k-1). The low pass filtered value is monitored for a predetermined period of time to determine if one of the wheels has a smaller effective diameter than the other wheels.

A deformation of a rotating tire on a road surface is calculated the following. At first, time series data of acceleration extracted from measurement data of acceleration corresponding to one round of tire rotation is subjected to a time integration of second order to obtain displacement data so as to calculate the deformation at the tread portion. The time series data of acceleration and the displacement data in the non-contact region excluding a road surface contact region on the tire circumference at the tread portion are respectively approximated to calculate a first and a second approximation curves. The two approximation curves are subtracted respectively from the time series data of acceleration and the calculated displacement data, thereby extracting time series data of acceleration due to tire deformation and obtaining the deformation at the tread portion.

According to the measuring head, the zero point and the amount of front travel settings are facilitated. Firstly, the amount of front travel is set by allowing contacts 34, 34 to abut a master 50. Then, rotating the lever 42 in a direction indicated by an arrow E, or a close position, causes the bearing member 36 to be fastened to the swinging support shaft 28. At this time, a restoring force, or a force caused by reaction, of the bearing member 36 transferred from the bearing member 36 through the arm 38, cam plate 40 and shaft 48 to the measurement lever 32 causes the measurement lever 32 to deflect by an amount that equals to the amount of front travel, and therefore from the position where the amount of front travel is set to the zero point position. This automatically sets the zero point position.

The invention discloses an error detection device for a hourglass worm, comprising a body, a spindle unit and a measuring unit, wherein the spindle unit comprises a spindle servo motor, a spindle, a workpiece fixture to be measured and a tailstock; the spindle servo motor drives the spindle to rotate; the workpiece fixture to be measured is fixedly matched with the spindle in the circumferential direction; the measuring unit comprises a base, a rotating table, a measuring contact, a data acquisition system and a computer; the rotating table is arranged on the base in the manner of rotating around a z-axis; and the measuring contact is arranged on the rotating table in the manner of adjustable position along an x-axis, a y-axis and the z-axis and can rotate around an axis parallel to the z-axis. The coordinate measurement can be carried out for the hourglass worm by adopting the arc measuring method, the line by line measurement can be carried out, the efficiency is higher than that of the point by point measurement in the prior art, the influences of subjectivity of human intervention and mechanical error of the standard worm on the detection results are avoided, as different types of measuring contacts are adopted, various errors of the worm can be accurately detected, and the universality is strong.

The present invention relates to a calliper of the king used to measure tree diameters, comprising a fixed scale or a graduated rule (2) along which a slide (3) is movable, wherein the calliper includes a leg (4) attached to one end of said rule and a leg (5) attached to the slide (3), wherein measuring of said diameter is effected between said legs, and wherein said calliper includes an electronic unit for measuring the position of the slide (3) along the rule (2) and for storing measurement values and other desired data. The invention is characterised in that the graduated rule (2) includes a longitudinally extending internal cavity (8); in that a measuring element includes an electrically conductive wire (10) extending in said cavity (8) and attached to oth ends of the rule (2); in that the part of the slide (3) located at the rule (2) includes a permanent magnet (11); in that the wire (10) co-acts with a piezo crystal (19) in the close proximity of said one end (13); in that respective ends (13, 16) of said wire (10) are connected electrically to a pulse generator which functions to generate short electric pulses of predetermined duration; and in that the calliper includes detector means (18) which co-acts with the piezo crystal (19) and which is adapted to detect a geometric change in the wire (10), wherein said piezo crystal functions to emit an electric pulse in response to said geometric change.

A method of calculating the tip clearance during operation of a combustion turbine engine that includes the steps of: measuring a cold tip clearance and a cold shell-to-shell distance; while the combustion turbine engine is operating, measuring an operating parameter and measuring a shell-to-shell distance with a proximity sensor; calculating the tip clearance based on the cold tip clearance measurement and the operating parameter measurement; calculating the shell-to-shell distance based on the cold shell-to-shell distance measurement and the operating parameter measurement; comparing the shell-to-shell distance measurement of the proximity sensor with the shell-to-shell distance calculation; and calibrating the calculated tip clearance calculation based on the comparison.

This device (20) comprises a first sensor (22) of a radial measurement of the tubular component (12) and a support (24) able to drive the first sensor (22) along a circular trajectory in a predefined plane orthogonal to the principal axis of the component (12). In particular, the support (24) comprises a main body (26) able to be fixed by freeable fixing means (28) to the component and a rotation shaft (30) onto which is fixed an arm (32) bearing the first sensor (22) so as to allow the displacement of the first sensor (22) along a circular trajectory inside or around the component (12). Furthermore, the device (20) comprises a second sensor (34) for measuring an angular position of the first sensor (22) for each of its radial measurements, the radial and angular measurements obtained making it possible to determine the profile of the component (12) in the predefined plane (P).

The invention discloses a tree diameter at breast height automatic measurer, which relates to a measurement device, particularly relates to a wireless sensor network-based tree diameter at breast height automatic measurer and belongs to the technical field of tree measurement tools. The tree diameter at breast height automatic measurer comprises a binding band; the binding band is a resistance band; one end of the resistance band is provided with a fixed knot and the other end of the resistance band is provided with a mobile knot; the fixed knot is arranged in a fixed knot box, and a first buckle is arranged on the side surface of the fixed knot box; the mobile knot is arranged in a spring pressure box, a second buckle is arranged on the side surface of the spring pressure box, the first buckle and the second buckle are located in the same horizontal plane, and the first buckle and the second buckle are connected via a clamping band; a fixed knot wire and a mobile knot wire are respectively connected onto the fixed knot and the mobile knot, and tail ends of the fixed knot and the mobile knot are sealed in the spring pressure box; tail ends of the fixed knot wire and the mobile knot wire are bent; and the spring pressure box is internally provided with a measurement control unit. The measurement reading is accurate, the efficiency is high, and the safety is good.

Disclosed is a bore measurement unit having an elongate main body with first and second ends. A first adjustment mechanism is disposed near the first end and a second adjustment mechanism is disposed near said second end. The adjustment mechanisms expand or contract, through triangulating arms, to relative diameters, such that when the unit is inserted into a hollow bore it may be centered therein. A measuring portion of the unit measures the internal diameter of the bore. The measuring unit includes at least one sensor and preferably takes more than three readings at each distance of insertion to formulate a best fit circle of the inner bore diameter.

A borehole caliper tool includes a tool body and an arm coupled to the tool body. The arm is deflectable relative to the tool body. The caliper tool further includes a cam coupled to the arm such that a position of the cam changes as the arm deflects. The caliper tool further includes a proximity sensor for sensing the position of the cam, wherein the position of the cam provides an indication of the deflection of the arm relative to the tool body.

A system and method for calculating misalignment of a rotational body includes: deriving radial displacement amounts of the rotational body for at least four or more measurement points; selecting three arbitrary points among all the measurement points to calculate a circle; calculating circle values for all the measurement points from the calculated circle; calculating differences between the calculated circle values and the radial displacement amounts as error amounts at the measurement points; summing the error amounts to derive a total error amount value; repeating calculation for combinations of three measurement points to calculate each total error amount value; selecting a calculated circle with a minimum total error amount value as a most probable circle; and calculating deviation between the center of the most probable circle and the center of rotation of the rotational body as misalignment data of the most probable circle.