Top PDF Method of ultrasonic measurement of texture

Method of ultrasonic measurement of texture

Method of ultrasonic measurement of texture

Method of ultrasonic measurement of texture Abstract A method for measuring texture of metal plates or sheets using non-destructiveultrasonic investigation includes measuring the velocity of ultrasonic energy waves in lower order plate modes in one or more directions, and measuring phase velocity dispersion of higher order modes of the plate or sheet if needed.

14 Read more

Method of ultrasonic measurement of texture

Method of ultrasonic measurement of texture

Method of ultrasonic measurement of texture Abstract A method for measuring texture of metal plates or sheets using non-destructive ultrasonic investigation includes measuring the velocity of ultrasonic energy waves in lower order plate modes in one or more directions, and measuring phase velocity dispersion of higher order modes of the plate or sheet if needed.

14 Read more

Semi automatic system for ultrasonic measurement of texture

Semi automatic system for ultrasonic measurement of texture

Semi-automatic system for ultrasonic measurement of texture Abstract A means and method for ultrasonic measurement of texture non-destructively and efficiently. Texture characteristics are derived by transmitting ultrasound energy into the material, measuring the time it takes to be received by ultrasound receiving means, and calculating velocity of the ultrasound energy from the timed measurements. Textured characteristics can then be derived from the velocity calculations. One or more sets of ultrasound transmitters and receivers are utilized to derive velocity measurements in different angular orientations through the material and in different ultrasound modes. An ultrasound transmitter is utilized to direct ultrasound energy to the material and one or more ultrasound receivers are utilized to receive the same.
Show more

13 Read more

Means and method for ultrasonic measurement of material properties

Means and method for ultrasonic measurement of material properties

Means and method for ultrasonic measurement of material properties Abstract The system for field measurement of texture, stress and related material properties such as formability parameters using ultrasonic velocity measurements through crystalline plate or sheet. Electromagnetic acoustic transducers are utilized to generate, transmit, and receive ultrasonic bursts through the plate at different angular orientations with respect to the plane of the plate. Two of the transducers are driven in series when generating the ultrasonic bursts. Time measurements between transmission and reception of the bursts are precisely derived and converted into velocities. Information regarding stress, texture, and other related material properties such as formability parameters can be derived from these velocity measurements. The system is adjustable to be used for both ferrous and nonferrous crystalline plate. Alteration of the types of ultrasonic waves utilized, and the methods of generating the waves allows different properties such as texture and stress to be derived.
Show more

15 Read more

Ultrasonic Measurement of Texture of Cubic and Hexagonal Materials

Ultrasonic Measurement of Texture of Cubic and Hexagonal Materials

However, W 400 must be determined from absolute measurements of So or SHo wave velocities, hence the errors associated with the estimates are larger compared to those ofW420 and W440·[r]

8 Read more

Analysis of a Semi Automatic System for the Ultrasonic Measurement of Texture

Analysis of a Semi Automatic System for the Ultrasonic Measurement of Texture

Comparison to evaluation of the systematic errors between ultrasonic and diffraction determinations of ODC's establish that the accuracy of the semi-automatic system[r]

8 Read more

Ultrasonic characterization of texture

Ultrasonic characterization of texture

Ultrasonic characterization of texture Abstract This paper will propose a new technique to characterize texture of rolled plates of cubic crystallites. This technique uses information from ultrasonic velocities of high order plate mode to improve the estimation of orientation distribution coefficients (ODC's), especially W 400 . Also discussed will be the generalization of this technique to the case of hexagonal crystallites.

8 Read more

A method for the measurement of hydrodynamic oil films using ultrasonic reflection

A method for the measurement of hydrodynamic oil films using ultrasonic reflection

Figure 7. Reflection coefficient spectra for a series of pulses reflected back from an oil interface between two steel blocks. The frequency range is such that the films resonate and show reflection minima. Both these film stiffness and film resonance methods can potentially be used to determine oil film thickness. As described above, the latter method is more attractive because only the frequency needs to be measured. The stiffness method requires that both amplitude and frequency are determined. However, many hydrodynamic films will be too thin to resonate at practical testing frequencies. In this work, therefore, the film stiffness method, using lower frequencies, has been used.
Show more

19 Read more

ULTRASONIC WAVES - MEASUREMENT OF THE ULTRASONIC VELOCITY OF WATER

ULTRASONIC WAVES - MEASUREMENT OF THE ULTRASONIC VELOCITY OF WATER

Freelance Researcher (M.Sc. Physics) ABSTRACT The ultrasonic in general follows the principles delineated in acoustics the study of vibration and the correlation between pitch and frequency of the round source to scientific standard. Ultrasound devices operate at frequencies from the kilohertz range to the gigahertz range. We have some methods to generate the ultrasonic wave there are piezoelectric generator magneto striction generator. Mechanical Method and Ultrasonic waves propagated through a medium can be detected in number of ways. And we can measure the Ultrasonic velocity of liquid by using measuring cell. Ultrasonication is used in many applications, such as homogenizing, disintegration sono chemistry, dyeing or cleaning. Health practitioners involved in prenatal care have reason to be concerned about the use of ultrasound although proponents point out that ultrasound has been used in obstetrics for 50 years. The present paper aims to measure the nature of ultrasonic waves and to measure its velocity of water.
Show more

6 Read more

Angular dependence of ultrasonic wave propagation in a stressed, orthorhombic continuum: Theory and application to the measurement of stress and texture

Angular dependence of ultrasonic wave propagation in a stressed, orthorhombic continuum: Theory and application to the measurement of stress and texture

A theory for ultrasonic wave propagation in a symmetry plane of a biaxially stressed, orthorhombic continuum is presented. Since many of the material parameters which appear in the analysis are unknown, in particular the third‐order elastic constants of polycrystalline metals, emphasis is placed on the angular dependence of the velocities. An expansion to first order in stress‐induced anisotropy and to second order in textural anisotropy reveals terms with twofold, fourfold, and sixfold symmetry. Scenarios are proposed for using various properties of this symmetry to deduce the difference in magnitude and directions of the principal stresses independent of textural anisotropy and the textural anisotropy independent of the stresses.
Show more

13 Read more

Effect of zooming on texture features of ultrasonic images

Effect of zooming on texture features of ultrasonic images

The implications of these results are that second order sta- tistics should be used under standardised resolution set- tings, which means that these factors should be kept steady during the scanning process or a method of stand- ardisation needs to be applied. In everyday practice, plaque resolution can vary up to 3 times, between 10–30 pixels/mm; this depends on the depth and zoom of the scanner. The former can vary from 2–5 cm. The combina- tion of variable depth of carotid arteries and various zoom factors results in images of substantially different pixel number and therefore resolution (pixels/mm) of the region of interest (carotid plaque). This "normalised" res- olution of the region of interest should not be confused with the image resolution, determined during the initial
Show more

10 Read more

Improvements in Ultrasonic Measurement Modeling with Applications to Ultrasonic Reliability

Improvements in Ultrasonic Measurement Modeling with Applications to Ultrasonic Reliability

Over the past several years, work has been reported on the develop- ment and implementation of a measurement model relating measured ultra- sonic signals obtained [r]

7 Read more

Precision Core Temperature Measurement of Metals Using an Ultrasonic Phase-Shift Method

Precision Core Temperature Measurement of Metals Using an Ultrasonic Phase-Shift Method

J. Manuf. Mater. Process. 2019, 3, 80 11 of 12 5. Conclusions This study showed that an ultrasonic measurement of the speed of sound in a metal based on the phase-shift method can be used to obtain the core temperature of the metal with a resolution of up to 0.1 ◦ C. Based on simulation results of the two main ultrasonic measurement techniques—the pulse-echo and the phase-shift techniques—phase-shift is the less expensive technique for high resolution ultrasonic thermometry in metals. The two-frequency continuous wave method (TFcw) and multiple frequency continuous wave method (MFcw) are two improvements on the general phase-shift method for longer range and finer resolution measurements. A simulation was performed to observe the individual effects of expansion and change in ultrasonic velocity on time-of-flight. Based on the simulation, ultrasonic velocity can be relied upon for measuring time of flight and, where necessary, compensations can be made for the material expansion. Using a 5 MHz transducer, 15 mm steel plate and varying the temperature from 20 to 30 ◦ C, a voltage equivalent of phase difference was obtained. Overall, the results demonstrate that phase-shift ultrasonic thermometry can be used for core temperature measurement with a resolution of 0.1 ◦ C. A possible application of this study would be for temperature monitoring during co-ordinate metrology, such as on a co-ordinate measuring machine. As part of future work to deploy this setup in subtractive manufacturing, more experiments will be undertaken to understand the effects of swarf and coolant on ultrasonic thermometry. Future experiments will also be carried out to understand the effect of temperatures above 200 ◦ C on ultrasonic velocity. Also, as different materials have different physical properties, ultrasonic thermometry must be calibrated for the material of which the measurement is to be made. Future work will also address the possibility of using ultrasonic thermometry to measure the temperature of a region or a point within different materials. The use of switching algorithms to different frequencies for different materials and material sizes will also be researched.
Show more

12 Read more

Turbulent slurry flow measurement using ultrasonic Doppler method in rectangular pipe

Turbulent slurry flow measurement using ultrasonic Doppler method in rectangular pipe

Acoustic methods may be a suitable option when it comes to measurement of a distribution of velocity in flowing slurries. The methods are capable of measuring an instantaneous velocity profile along the measuring line and they are applicable to opaque liquids and opaque pipe wall materials. Furthermore, the acoustic method applications can be non-intrusive, which is of vital importance in slurry flow testing.

6 Read more

Ultrasonic Distance Measurement Module

Ultrasonic Distance Measurement Module

Distance measurement sensor is a low cost full functionality solution for distance measurement applications. The module is based on the measurement of time flight of ultrasonic pulse, which is reflected by an object. The distance to be measured mainly depends on the speed of ultrasonic waves in space or air –which is a constant- and the flight time of the pulse.

7 Read more

Ultrasonic Thickness Measurement of Ships

Ultrasonic Thickness Measurement of Ships

HISTORY & CURRENT LEGISLATION The IACS / IMO requirements about ultrasonic thickness measurement of ships were incorporated into the Classification Societies’ Rules as these are conventionally known, soon after their adoption by the two Bodies. Later, however, the Common Structural Rules, separate for Tankers and Bulk Carriers (CSR) were formulated and adopted by IACS and were entered into force in April 2006.

120 Read more

High frequency ultrasonic characterization of carrot cell texture

High frequency ultrasonic characterization of carrot cell texture

standard amount of variation that is expected from ultrasound transducers of this quality. When properly accounted for, it seems that variation would be a limited source of error when characterizing carrots. Ideally, when the same sample is imaged numerous times, the same response would be measured each time. As exemplified in figure #3, there is an average 20% variation between replications. All things being equal, looking at the transducer variation above, one would expect the variation here to be 6%. But in this case, we see an extra 14% variation. This may have been caused by different couplings of the samples between the transducers, transducer misalignment, or variation of pressure applied to the samples. During the measurement process, i assumed that that carrot was in a constant state. Realistically, it is reasonable to suggest that slight changes cou have occurred within the carrot. For instance, the sample imaged near the end of the trial was in the jar substantially longer than the sample imaged near the beginning. This gives the last sample more of an opportunity to absorb the water around it. What this means that the frequency response of a sample could vary to some degr with time. This research data was not analyzed in this respect, so this factor is not accounted for. Needless to say the majority of the variation was likely due to problems with transducer alignment and coupling.
Show more

33 Read more

Flow Measurement SITRANS FS (ultrasonic) Inline ultrasonic flowmeters

Flow Measurement SITRANS FS (ultrasonic) Inline ultrasonic flowmeters

SITRANS FUS380 uncertainty Flowmeter Calibration and traceability To ensure continuous accurate measurement, flowmeters must be calibrated. The calibration is conducted at Siemens flow fa- cilities with traceable instruments referring directly to the physi- cal unit of measurement according to the International System of Units (SI).

9 Read more

Level Measurement Continuous level measurement - Ultrasonic controllers

Level Measurement Continuous level measurement - Ultrasonic controllers

• SITRANS LUT420 Level Controller: Level or volume measurement of liquids, slurries, and solids, as well as basic pump control functions, and basic data logging capability • SITRANS LUT430 Level, Pump and Flow Controller: Includes all features of the LUT420 plus a full suite of advanced pump control and alarm functionality, open channel flow monitoring, and basic flow data logging capability

8 Read more

Evaluation of an ultrasonic method for measurement of oil film thickness in a hydraulic motor piston ring

Evaluation of an ultrasonic method for measurement of oil film thickness in a hydraulic motor piston ring

An ultrasonic pulse will reflect from a thin film interposed between two solids. The proportion of the pulse that is reflected depends on the stiffness of the intermediate layer. If the acoustic properties of the film material are known, then the stiffness can readily be used to determine the film thickness. This principle has been employed for the piston ring lubrication case. A piston/cylinder test bench has been used to evaluate the ultrasonic method. A focusing piezo-electric transducer is mounted outside the cylinder and ultrasonic pulses reflected back from the inner bore. The variation of these pulses as the piston ring passes underneath is investigated and used to determine oil film thickness. Films in the range 0.7 to 1.3 m were measured; the thickness did not depend strongly on either ring speed or sealed pressure.
Show more

9 Read more

Show all 10000 documents...