183 results about "Probe calibration" patented technology

A system and method to calibrate a temperature probe through immersion in a substance of known change of state temperature. The saturated Surface Acoustic Wave (SAW) probe temperature signal is calculated, overcoming oven reference temperature variability.

A method of calibrating a probe mounted on a machine in which the probe has a probe calibration matrix which relates the probe outputs in three orthogonal axes to the machine's X, Y and Z coordinate system. A datum ball mounted on the machine is bi-directionally scanned by the probe in one or more planes. For each plane, the mean direction of two approximate probe vectors in the plane is rotated about an axis orthogonal to that plane until the apparent material condition from the scan in each direction is the same. This process may be iterative. The mean values of the directions of the probe vectors for each plane are rotated, thus forming a corrected probe calibration matrix. The datum ball is preferably bi-directionally scanned in three orthogonal planes.

A system and method for improved ultrasound strain imaging includes using data from a tracking system to enhance the quality of ultrasound strain image and to reduce the dependency of image quality of the user's expertise. The tracking information is synchronized with the RF frames and interpolated to find the transformation corresponding to each frame. The RF frames with their transformations are incorporated into calculation of ultrasound strain images. The tracking system may be an optical tracker, electromagnetic tracker, accelerometer, or a structured light system. The structured light system may also be used for probe calibration, by calibrating the surface of the probe pre-operatively. In addition, a relative Young's Modulus may be calculated using tracking information that is independent from the distribution of input force.

A method in which thermal mass and manufacturing differences are compensated for in thermometry probes by storing characteristic data relating to individual probes into an EEPROM for each probe which is used by the temperature apparatus.

A method of measuring a clearance distance between a first member and a stationary member is provided. The method includes measuring the clearance distance using a first probe that is removably coupled at least partially within a mounting adapter, determining a first probe calibration based on the measured clearance distance, measuring a gauge clearance distance using a second probe, and modifying the first probe calibration based on the gauge clearance distance.

The invention relates to the field of medicine, and in particular relates to an ultrasonic probe calibration device and an ultrasonic probe calibration method based on optical positioning. The ultrasonic probe calibration device based on optical positioning is composed of a visual tracking device, an ultrasonic collecting device, a calibrator and a computer, wherein a tracking identification Marker 1 is fixed on an ultrasonic probe; the calibrator is a water tank with a plurality of trustums of different heights on the bottom, and one side of the calibrator is provided with a tracking identification Marker 2. An ultrasonic probe calibration method based on optical positioning comprises the following steps: segmenting a calibrator ultrasonic image collected by the ultrasonic probe, extracting the bottom picture contour of the calibrator, synchronously acquiring the coordinates of the Marker 1 and Marker 2 and the related position relation according to the visual tracking device, establishing the spatial position relation between the ultrasonic image and visual sense, and carrying out point cloud registration by adopting a coincidence point shift algorithm, and thus the coordinate transformation from the ultrasonic image pixel points to the three-dimensional space is realized. With the device and the method, the transformation precision from two-dimensional ultrasonic image information to three-dimensional space can be improved, and a basis is provided for the surgical navigation system based on the ultrasonic image.

A method of calibrating a measurement probe (10) mounted on a machine is described. The measurement probe (10) has a stylus (14) with a workpiece contacting tip (16). The method comprises determining a probe calibration matrix that relates the probe outputs (a,b,c) to the machine coordinate system (x,y,z.). The method comprising the steps of scanning a calibration artefact (18) using a first probe deflection (d1) to obtain first machine data and using a second probe deflection (d2) to obtain second machine data. The first and second machine data are used to obtain a pure probe calibration matrix in which any machine errors are substantially omitted. Advantageously, the method determines the pure probe matrix numerically based on the assumption that the difference between the first and second machine position data is known.

The invention relates to an automatic ultrasonic detecting method and device of defects inside an old crank of an engine, belonging to the field of automatic ultrasonic detection. The method comprise the steps of: firstly, calibrating a single crystal angle probe by adopting a crank probe calibration test block, determining detection parameters of a real front rake angle beta and a real side rake angle beta' of the probe, a probe zero point, material sound velocity of the crank, and the like; and then detecting the crank by adopting a crank automatic ultrasonic detection device, wherein the detection device comprises a crank clamp and an ultrasonic probe clamp, the crank clamp is used for clamping the crank and enabling the crank to rotate at constant speed, the ultrasonic probe clamp is used for clamping the probe, and after the crank rotates for one circle, the probe can check a shaft neck for one circle. Internal defects of the shaft neck and an R angle can be automatically detected by adopting one probe, thus the reliability and the detection efficiency are furthest improved. The method can be used for detecting the defects of cracks, impurities, air holes and the like with equivalent size of above 1mm inside the shaft neck and at the R angle.

The invention discloses a data processing method used for improving the application efficiency of a five-hole probe, and the method is a triple interpolation-based data processing method for the five-hole probe. The method comprises the steps of firstly, assuming a Mach number, taking Mach number, deflection angle and pitch angle calibration pressure coefficients as known variables, substituting probe calibration data, and obtaining a deflection angle and a pitch angle by adopting triple interpolation; secondly, taking the Mach number, the deflection angle and the pitch angle as known variables, and obtaining total pressure and static pressure characteristic coefficients separately by adopting the triple interpolation; thirdly, substituting an experimental measurement value and the total pressure and static pressure characteristic coefficients into total pressure and static pressure characteristic coefficient formulae, and performing calculation to obtain a total pressure, a static pressure and a Mach number; and finally, performing difference operation on the obtained Mach number and the assumed Mach number, and performing iterative computing until a difference value is smaller than a set precision value. According to the novel data processing method, the pressure data measured by a five-hole probe experiment can be quickly and conveniently converted into flow field velocity magnitude and direction, and the data interpolation precision can be improved.

The invention discloses a method for calibrating a large-angle or small-angle longitudinal wave angle probe for an ultrasonic fault detector, and relates to an instrument calibration method. The method comprises an ultrasonic fault detector, and sequentially comprises the following steps of: preparing a test block used for calibrating the probe and a large-angle or small-angle longitudinal wave angle probe, wherein the test block is a material used by a workpiece during actual fault detection, and drilling two holes with the horizontal heights of h1 and h2 beyond three times of near field of the test block respectively, wherein the h1 is unequal to the h2; moving the probe back and forth on the test block until the two holes display the highest reflection echo on the ultrasonic fault detector respectively, obtaining distances S1 and S2 from the end of transmitting ultrasonic waves in the probe to the two holes respectively, and measuring distances L1 and L2 from the two holes to the front end of the probe; and obtaining a probe inner sound path a, a probe front sound path b and a probe K value according to a mathematical model. The method for calibrating the large-angle or small-angle longitudinal wave angle probe for the ultrasonic fault detector overcomes the defect that proper methods and test blocks for calibrating the K value of the longitudinal wave angle probe, the probe inner sound path a and the probe front sound path b do not exist at present.

The invention discloses a triggering type probe calibration method of a coordinate measuring machine. According to the method, a probe is rotated to four or more different directions, a standard ball is measured under different probe compensation conditions, four or more measured spherical centers are used to construct a sphere in a least square method, the center of the constructed sphere serves as the center of the standard ball, and a theoretical value of the radius of the sphere equals the distance from an origin point of a probe coordinate system to the spherical center of a small ball in the end portion of a measuring rod. Thus, triggering type probe calibration can be completed via simple calculation. The probe calibration method is suitable for triggering type problems, using rotatable measuring seats, commonly used in the orthogonal coordinate measuring machine.

A monitoring, tracking, and calibration system tracks temperature data and the validity of temperature measuring devices. If an item is temperature sensitive, the system permits temperature readings to be taken by a remote transmitter or other temperature measuring device and stored by a computer. A calibration device is built into the remote transmitter or attached in line to a temperature sensor and include at least one fixed value. The remote transmitter samples that fixed value periodically or in response to an instruction from the computer. The computer, in turn, compares the fixed value to a respective expected value. If the comparison indicates that the fixed value compares favorably to the at least one respective expected value, the remote transmitter is considered calibrated and functioning correctly. Otherwise, the remote transmitter is considered faulty and an error is reported so that corrective action may be taken.

The invention discloses a method for collecting a surface wave and a creeping wave of an ultrasonic flaw detector, relating to an apparatus collecting method. The apparatus comprises an ultrasonic flaw detector which detects the flaw of a work piece by transmitting the ultrasonic wave through a probe head, wherein the detected distance of the flaw of the work piece is the sum of practical distance and corrected distance. The method sequentially comprises the following steps of: preparing a standard test block for correcting the probe head, and the surface wave or the creeping wave probe head for the ultrasonic flaw detector; leading the probe head to move on the test block back and forth till that the ultrasonic flaw detector displays that the surface wave and the creeping wave generate highest reflected wave at the flaw of the standard test block so as to obtain the distance S from an ultrasonic wave-transmitting end in the probe head to the flaw; detecting the distance L from the headmost end of the probe head to the flaw; and subtracting L from S to obtain the correcting distance for correcting ultrasonic flaw detector. The method fills in gap that the existing ultrasonic flaw detector is difficult to correct the front edge of the transverse wave (the surface wave and the creeping wave) probe head and the route of the ultrasonic wave in the probe head.

An enhanced wireless eddy current probe is disclosed which has means to wirelessly couple to a non-destructive inspection (NDI) system situated some distance away from an inspection point on a material under inspection. The disclosed enhanced wireless eddy current probe provides means for executing advanced functions necessary for a complex eddy current inspection operation. These functions include, but are not limited to, storing, loading, and executing a predetermined firing sequence on an array of coil elements, probe balancing, probe calibration, and providing bibliographic information specific to said probe to a wirelessly coupled NDI system.

The invention discloses a space registration and real-time navigation method for a minimally invasive mammary gland interventional surgical robot. The method comprises the steps that S1, kinematics modeling and simulation of the robot are carried out; s2, positioning and registering by a navigation system; s3, coordinate scale calculation and spatial registration of an ICP registration algorithm; s4, the position and posture of the puncture needle are positioned in real time, kinematics modeling can be carried out on the puncture device, and forward and inverse kinematics solution is carried out; the degree of freedom, configuration and geometric parameters of the designed robot can meet the requirements of mammary gland biopsy puncture through preliminary verification, and the problem of inconsistent coordinate space scales is solved through an ICP iterative registration algorithm based on coordinate scale calculation and a registration algorithm simulation experiment; a navigation experiment platform is built based on an OptiTrack motion capture system and 3ds Max three-dimensional animation software, passive positioning probe calibration and image space registration are completed, and visualization and positioning tracking of the position and posture of a puncture needle are achieved.

The invention discloses a method for calibrating a small-diameter probe for an ultrasonic flaw detector, belonging to the method for calibrating an instrument. The method for calibrating the small-diameter probe for the ultrasonic flaw detector comprises the following steps in sequence: manufacturing a test block for calibrating the small-diameter probe for the ultrasonic flaw detector; moving the external circular arc probe near the point O1 on the surface of the arc of the test block back and force, wherein the arc of the test block is drawn by adopting the radius R2; obtaining the range S1 of the echo of a radius R1; measuring the distance between the point O1 and the foremost edge of the small-diameter probe, wherein the distance is the front edge b of the small-diameter probe; adjusting the direction of the small-diameter probe to make the small-diameter probe aligned to the direction of the hole, and obtaining the range S of the echo of the hole; and obtaining the range a of the echo in the small-diameter probe and the value K of the small-diameter probe. The invention makes up the blank of the calibration of the value K of the small-diameter probe, the front edge b of small-diameter probe and the range a of the echo in the small-diameter probe and reduces the loss cost of the small-diameter probe.

The invention relates to a three-dimensional ultrasonic probe calibration device and a method for calibrating a three-dimensional ultrasonic probe. The three-dimensional probe calibration device comprises an optical positioning instrument, an optical positioning probe, an ultrasonic nondestructive flaw detector, a calibration template, a computer and a mechanical arm, wherein the optical positioning instrument and the ultrasonic nondestructive flaw detector are respectively connected with the computer, the optical positioning probe is fixed on the ultrasonic nondestructive flaw detector, the calibration template is a water tank of which the inner bottom is provided with a plurality of circular truncated cones, and counter bores are formed in the centers of the top surfaces of the circulartruncated cones. Compared with the prior art, the invention is based on optical localization, the improved calibration template is provided. Posture and pose information of the optical positioning probe is obtained through tracking, and the mechanical arm is adopted to clamp the ultrasonic nondestructive flaw detector for ultrasonic image scanning. And the optical positioning probe is directly contacted with the point target to obtain the position information of a point target, so that the operation difficulty of the calibration process is reduced, the additional calibration of the position information of the template point target is avoided, and the calibration precision and efficiency are improved.

The invention discloses a probe calibration scheme for a MIMO testing system. The calibration method proposed by the invention comprises the following steps: proceeding from the formula Friis transmission of an antenna, determining the system consumption when the signal is at the radio wave darkroom part through the adoption of the two-antenna method, and performing normalized compensation on a probe antenna. The gain of one probe in a multi-probe antenna measurement system is selected as the reference standard, a network analyzer is used for receiving-transmitting a signal, the normalized processing is performed through the analysis and processing on the data read by the network analyzer and the compensation of different values for the probe. The scheme disclosed by the invention has the features of being large in system channel capacity, high in communication quality and accurate in testing result.

The invention discloses a correction method of an inner arc probe or an outer arc probe in an ultrasonic flaw detector, in particular to an instrument correction method by using an ultrasonic flaw detector, an inner arc probe or an outer arc probe which is used in the ultrasonic flaw detector. The correction method comprises the following steps of: cutting a block on a workpiece to be detected asa probe-connecting test block; respectively drilling two holes in different distances on the test block; searching the two holes back and forth by using the inner arc probe until the highest reflection echoes of the two holes are displaced on the ultrasonic flaw detector; respectively acquiring the distances from an ultrasonic wave emitting end in the probe to the two holes; measuring an arc length from the foremost border of the probe to the normal line of the two holes; and respectively acquiring a sound path a, a probe front border b and a probe K value in the inner arc probe or the outer arc probe according to a mathematical model. The invention fills in gaps of the test block and the correction method for acquiring a connection K value, a valve a and a valve b of the inner arc probe or the outer arc probe in the ultrasonic flaw detector, shortens the manufacture period, reduces the manufacture cost of the test block, improves the service rates of the probes and prolongs the life cycles of the probes.