Four-point probe geometric correction factor for isotropic cylindrical samples with non-equal probe distances

Measurement ◽  
2021 ◽  
pp. 109703
Author(s):  
Sepideh Akhbarifar ◽  
Nicholas A. Mecholsky ◽  
Marek Brandys ◽  
Werner Lutze ◽  
Ian L. Pegg
Keyword(s):  
Correction Factor ◽  
Geometric Correction ◽  
Cylindrical Samples

Построение дисперсионной зависимости корректирующего коэффициента при контроле компактных изделий квадратного сечения импакт-эхометодом

2021 ◽  
pp. 3-14
Author(s):  
В.К. Качанов ◽  
И.В. Соколов ◽  
А.А. Самокрутов ◽  
В.Г. Шевалдыкин ◽  
С.А. Федоренко ◽  
...  
Keyword(s):  
Dispersion Curve ◽  
Longitudinal Wave ◽  
Correction Factor ◽  
Lamb Wave ◽  
Geometric Correction ◽  
Wide Range

This paper presents results of calculation of the geometric correction factor β of the compact square-sectioned samples. It is shown by simulation that in compact samples thickness resonance type changes from longitudinal wave to Lamb wave. Furthermore, the geometric correction factor varies over a wide range and nonlinear in compact samples. The dispersion curve of the geometric correction factor β for compact square-sectioned samples is built.

A well-type ionization chamber geometric correction factor

1996 ◽  
Vol 41 (7) ◽  
pp. 1141-1148 ◽  
Author(s):  
R J Meiler ◽  
C H Sibata ◽  
A K Ho ◽  
C de Souza ◽  
K H Shin
Keyword(s):  
Correction Factor ◽  
Ionization Chamber ◽  
Geometric Correction

Improvements to the Chebyshev expansion of attenuation correction factors for cylindrical samples

1990 ◽  
Vol 23 (5) ◽  
pp. 378-386 ◽  
Author(s):  
D. F. R. Mildner ◽  
J. M. Carpenter
Keyword(s):  
Attenuation Correction ◽  
Correction Factor ◽  
Asymptotic Expression ◽  
Rational Numbers ◽  
Correction Factors ◽  
Chebyshev Expansion ◽  
Expansion Coefficients ◽  
Cylindrical Samples ◽  
Attenuation Correction Factor

The accuracy of the Chebyshev expansion coefficients used for the calculation of attenuation correction factors for cylindrical samples has been improved. An increased order of expansion allows the method to be useful over a greater range of attenuation. It is shown that many of these coefficients are exactly zero, others are rational numbers, and others are rational fractions of π −1 The assumptions of Sears [J. Appl. Cryst. (1984), 17, 226–230] in his asymptotic expression of the attenuation correction factor are also examined.

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