Optimization of buffer rod geometry for ultrasonic sensors with reference path

Hoppe, N.; Püttmer, A.; Hauptmann, P.

doi:10.1109/tuffc.2003.1182120

Cited by 16 publications

(11 citation statements)

References 14 publications

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“…These buffer materials are assumed to have reasonably realistic acoustic parameters because very few alternative materials are available in the low acoustic impedance range for buffer materials. The parameters of aluminum are also found to be quite close to that of quartz glass and Zerodur, which have been found suitable for acoustic measurement of liquid density using a buffer rod configuration measurement cell [34].…”

Section: A Introductionmentioning

confidence: 55%

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Bjorndal¹,

Frøysa

2008

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-The known acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell are presented, along with 2 new generic approaches for measuring the pressure reflection coefficient using 2 buffer rods enclosing the liquid to be characterized in a symmetrical arrangement. An acoustic transducer is connected to each of the buffer rods. The generic approaches are divided into a relative amplitude approach and a mixed amplitude approach. For the relative amplitude approach, families of 4, 5, or 6 echo signals can be used to obtain the pressure reflection coefficient. The mixed amplitude approach uses specific information about the transducers and/or the electronics sensitivities in receive mode to obtain the pressure reflection coefficient using families of 3, 4, 5, or 6 echo signals. Some of the new methods from the relative amplitude approach imply a reduced uncertainty relative to the previously known ABC method. The effect of the liquid attenuation, digitizer bit resolution, and the signal-to-noise ratio on the uncertainty characteristics of the pressure reflection coefficient are discussed, along with a discussion of the suitability of the various methods for different buffer materials.

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Section: A Introductionmentioning

confidence: 55%

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Bjorndal¹,

Frøysa

2008

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…Propagating ultrasound in the solid is accompanied by dispersion, which broadens the wave envelope and affects the ultrasonic temperature measurement precision [18,19,20]. To prevent the dispersion of ultrasonic propagation in the rod, the diameter of the waveguide rod should be lower than 1/10 of the longitudinal wavelength [4].…”

Section: Ultrasonic Thermometry Requirement and Developmentmentioning

confidence: 99%

Ultrasonic Al2O3 Ceramic Thermometry in High-Temperature Oxidation Environment

Wei

Gao

Xiao³

et al. 2016

Sensors

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In this study, an ultrasonic temperature measurement system was designed with Al2O3 high-temperature ceramic as an acoustic waveguide sensor and preliminarily tested in a high-temperature oxidation environment. The test results indicated that the system can indeed work stably in high-temperature environments. The relationship between the temperature and delay time of 26 °C–1600 °C ceramic materials was also determined in order to fully elucidate the high-temperature oxidation of the proposed waveguide sensor and to lay a foundation for the further application of this system in temperatures as high as 2000 °C.

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“…5, some signals after the reflected signal arrival can also be seen. These generally unwanted signals are spurious echoes also known as trailing echoes or acoustic noise signals [8,[23][24][25]. The noise signals are generated at different parts of the buffer rod boundaries because of mode conversion, wave reverberation and diffraction in the rod of finite diameter.…”

Section: Resultsmentioning

confidence: 99%

Study of the effect of angle errors in conical ultrasonic sensors

García-Álvarez

García‐Hernández

Chávez

et al. 2013

IET Science, Measurement & Technology

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Many ultrasonic sensors intended for non-destructive testing include a plastic or metal element, known as buffer rod, between the ultrasonic transducer and the material under analysis. Buffer rods are often terminated in the form of a conical tip for ultrasonic inspection of liquid-like substances. The conical tip is carefully shaped in a 45?? angle to favour the in phase reception of all the components of the ultrasonic wave reflected at the buffer tip, obtaining thus a maximum amplitude measurement signal. The effect of the buffer rod cone angle on measurement signals is studied in this work. A straightforward approximate formula for the effect of the error angle on measurement signal amplitude is used. Simulations are performed using a two-dimensional finite differences tool. Measurements are conducted with the same operating conditions and buffer rod materials and dimensions as those defined for both approximate formula evaluation and simulations. Thus, a comparison of the approximate formula, simulation and measurement results are established. Furthermore, the significance of some parameters such as ultrasonic transducer operating frequency and diameter, and buffer rod material are also analysed. The obtained results show that significant loss of the measurement signal amplitude is found only for cone error angles beyond the range of usual machining errors.Peer ReviewedPostprint (published version

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Optimization of buffer rod geometry for ultrasonic sensors with reference path

Cited by 16 publications

References 14 publications

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Ultrasonic Al2O3 Ceramic Thermometry in High-Temperature Oxidation Environment

Study of the effect of angle errors in conical ultrasonic sensors

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