Ultrasound measurement method: Errors, noise, and sensitivity

Cauty, Franck; Éradès, Ch.

doi:10.1007/bf02701514

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…Amplitude processing algorithms and temporary position of signal maximum are widely used in NDT (Couty and Ereides 2000). It is reasonable to mention that the given algorithms are effective at the high signal/noise ratio and for sufficiently stationary signals.…”

Section: Wavelet Analysis Of Results Of Ultrasonic Techniques Applicamentioning

confidence: 99%

“…Existent ultrasonic systems are oriented either on time analysis of events in the control zone or the determination of traverse speed of combustion front on the last 100 -150 mm of the burning charge in the local points (Couty and Ereides 2000). These limitations are caused by influence of the factors, accompanying the ultrasonic testing during the article firing:…”

Section: Wavelet Analysis Of Results Of Ultrasonic Techniques Applicamentioning

confidence: 99%

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Wavelet analysis—new opportunities for NDT

Efimov

2006

Nondestructive Testing and Evaluation

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The problem of equipping of wave techniques with a modern apparatus for result processing as wavelet analysis has been examined. The efficiency of wavelet transform (WT) for processing the data received with use of NDT methods has been demonstrated. Results of WT application at ultrasonic and microwave testing have been presented. The adaptive ultrasonic technique for dynamic measurement of thickness has been described.

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Section: Wavelet Analysis Of Results Of Ultrasonic Techniques Applicamentioning

confidence: 99%

Section: Wavelet Analysis Of Results Of Ultrasonic Techniques Applicamentioning

confidence: 99%

Wavelet analysis—new opportunities for NDT

Efimov

2006

Nondestructive Testing and Evaluation

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“…The ultrasound method used by ONERA is similar to the classical emission/reception non-destructive technique [7]. An ultrasound transducer emits a mechanical wave, which travels through the sample.…”

Section: Ultrasonic Methodsmentioning

confidence: 99%

Formulation and Characterizations of Nanoenergetic Compositions with Improved Safety

Wuillaume

Beaucamp

David‐Quillot

et al. 2014

Propellants Explo Pyrotec

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In order to improve the safety of energetic compositions, whether it has to be worked with less sensitive materials that are often less powerful or with high energetic materials crystals with improved purity and microstructure quality. A way to modify the crystal quality of an energetic material is to structure the matter on the nanoscale: the crystals size reduction should induce impurity modifications in the particles. That is one of the reasons why interest in nanoenergetic compositions that contain high energetic material (≥ 90 wt‐%) and an organic matrix (≤ 10 wt‐%) that takes part in constraining the explosive to organize itself on the nanoscale arose. The key point is to find or synthesize the matrix. In the course of this study, first ammonium perchlorate compositions structured on the nanoscale were synthesized (150 nm AP particles (80 wt‐%) dispersed in an organogel matrix (20 wt‐%)). The formulation process was based on the impregnation of porous organogels with a saturated aqueous solution of ammonium perchlorate followed by freeze drying. The overall composition had an oxygen balance equilibrated towards CO2. These AP nanocompositions show better safety behavior during combustion than there equivalent macrocompositions, while they burn more rapidly, with no degradation of their impact and thermal sensitivity properties. The formulation process of RDX nanocompositions is more complex as the solvent used is γ‐butyrolactone which can not be directly frozen dried. However, first RDX nanocompositions were formulated and characterized using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X‐ray powder diffraction, and drop weight impact. Lately compressions of these RDX compositions were performed, prior to gap‐test experiments.

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“…a measurement procedure should have no influence on the burning process. The ultrasonic method more fully satisfies requirements for high accuracy, remoteness, safety, cheapness and automation of test results processing [1]. A further development of the method focuses on the improvement of algorithms for isolating the noisy time coordinate of an echo pulse reflected from the burning surface of a propellant.…”

Section: Introductionmentioning

confidence: 99%

“…At high degrees of noise ISSN contamination, the search algorithm may find subsidiary maximums and represent them as principal ones. When the charge web thickness varies constantly or slowly, the application of time gating allows us to get free from subsidiary maximums in the 'round trip method' [1], if the probability of these maximums is low.…”

Section: Introductionmentioning

confidence: 99%

A method of quality comparison of different reference function application for ultrasonic measurement problems

Efimov

Lozhkova

2011

Nondestructive Testing and Evaluation

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The theoretical study reports a simulative comparison between error in determining the time position of an echo pulse using as a basis function the signal itself and approximate representations thereof. The advantage of the processing method utilising synthesised wavelets over the correlation method in the case of difference between an extracting signal and a reference one at a signal-to-noise ratio of 0-9.5 db was by applying a stability criterion. The studies are aimed at reducing the error in determining the burning rate of solid propellant charges via an ultrasonic method.

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Ultrasound measurement method: Errors, noise, and sensitivity

Cited by 9 publications

References 9 publications

Wavelet analysis—new opportunities for NDT

Wavelet analysis—new opportunities for NDT

Formulation and Characterizations of Nanoenergetic Compositions with Improved Safety

A method of quality comparison of different reference function application for ultrasonic measurement problems

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