Four‐point dc‐resistance measurement apparatus for anisotropic crystals

1986 ◽  
Vol 57 (5) ◽  
pp. 941-944 ◽  
Author(s):  
B. W. Pfalzgraf ◽  
H. Spreckels ◽  
H. Müscher
Keyword(s):  
Resistance Measurement ◽  
Measurement Apparatus ◽  
Dc Resistance

Studies of Adhesive Delamination Using DC-Resistance Measurement

1995 ◽  
Vol 34 (1) ◽  
pp. 117-142
Author(s):  
R. C. L. Tai ◽  
Z. Szklarska-Smialowska
Keyword(s):  
Resistance Measurement ◽  
Dc Resistance

scholarly journals Novel Wood Resistance Measurement Method Reducing the Initial Transient Instabilities Arising in DC Methods Due to Polarization Effects

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1253
Author(s):  
Silvia Casans Berga ◽  
Rafael Garcia-Gil ◽  
A. Edith Navarro Anton ◽  
Alfredo Rosado-Muñoz
Keyword(s):  
Relative Humidity ◽  
Electrical Resistance ◽  
Measurement Method ◽  
Resistance Measurement ◽  
Ambient Conditions ◽  
Transient Time ◽  
Polarization Effects ◽  
Initial Transient ◽  
Wood Resistance ◽  
Dc Resistance

A novel method for measuring the electrical resistance in wood is presented. It is based on applying an Alternating Current (AC) to two electrodes rammed into the wood. The method reduces the transient time for value stabilization. In case of Direct Current (DC) resistance measurement methods, typically used in wood measurement, an initial transient exists, invalidating the measured value during an initial transient period. This measurement method uses an electronic circuit based on a relaxation oscillator where the wood automatically sets the oscillation frequency depending on its electrical resistance. Compared to other AC methods, this circuit greatly simplifies the measurement process, not requiring any previous analysis for wood AC frequency estimation. Experimental results for four different wood species showed that, in all cases, the transient response of the measured wood resistance is improved when compared to the DC resistance method, reducing the stabilization time from 10–12 min in DC measurements to almost zero for the novel measurement method. The deviation between the initial wood resistance measurement and the stable value resulted in a range between 0.2% and 5% with the proposed method, while a range between 6% and 10% was obtained when using the DC method. Moreover, the proposed circuit is able to detect changes in wood resistance produced by small variations in temperature and environmental relative humidity during continuous long term measurements. For repeatability analysis, it was verified that similar ambient conditions of temperature and relative humidity (variations lower than 1 °C and 1%, respectively) in different moments provided variations lower than 1.5%. The method can also be applied to other fiber materials affectd by polarization effects when an electrical current is applied into them.

Application of in situ UV-vis spectroscopy and an in situ dc resistance measurement technique to the study of a poly(thiophene-3-methanol) film

1997 ◽  
Vol 437 (1-2) ◽  
pp. 167-174 ◽  
Author(s):  
Eeva Lankinen ◽  
Maija Pohjakallio ◽  
Göran Sundholm ◽  
Panu Talonen ◽  
Timo Laitinen ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Resistance Measurement ◽  
Vis Spectroscopy ◽  
Dc Resistance
Sign in / Sign up

Export Citation Format

Share Document