scholarly journals Approach for simultaneous determination of thickness and sound velocity in layered structures based on sound field simulations

2017 ◽  
Author(s):  
Elfgard Kühnicke ◽  
Mario Wolf ◽  
Sebastian Kümmritz
Keyword(s):  
Sound Velocity ◽  
Simultaneous Determination ◽  
Sound Field ◽  
Layered Structures

scholarly journals Annular arrays for novel ultrasonic measurement techniques

2016 ◽  
Vol 5 (2) ◽  
pp. 373-380 ◽  
Author(s):  
Mario Wolf ◽  
Elfgard Kühnicke ◽  
Sebastian Kümmritz ◽  
Michael Lenz
Keyword(s):  
Sound Velocity ◽  
Measurement Techniques ◽  
Sound Field ◽  
Non Invasive ◽  
Annular Array ◽  
Precise Knowledge ◽  
Curvature Measurement ◽  
Invasive Method ◽  
Front Curvature

Abstract. The paper shows how the precise knowledge of the sound field of an ultrasonic annular array can contribute to the development of novel measurement techniques. Emphasis is placed on (a) a non-invasive method for sound velocity measurements in fluids using the echo signals from scattering p]articles, (b) a non-invasive method for the combined determination of thickness and sound velocity in layered structures by using a novel focusing technique, and (c) a non-scanning curvature measurement method exploiting the wave front curvature of a reflected wave. To demonstrate the methods, the principles as well as results of simulations and measurements are discussed.

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

Simultaneous determination of seven compounds in Euronymus alatus by HPLC-DAD

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
YS Jung ◽  
JB Weon ◽  
CJ Ma
Keyword(s):  
Simultaneous Determination

Simultaneous determination of monomeric and oligomeric alkannin and shikonin by HPLC-DAD-APCI-MS

Planta Medica ◽  
2007 ◽  
Vol 73 (09) ◽  
Author(s):  
AN Assimopoulou ◽  
M Ganzera ◽  
H Stuppner ◽  
VP Papageorgiou
Keyword(s):  
Simultaneous Determination
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