Title:
NONCONTACT MEASURING METHOD FOR ELECTRIC RESISTANCE OF TEST MATERIAL
Document Type and Number:
Japanese Patent JP2535673
Kind Code:
B2
Abstract:
PURPOSE: To determine the stray capacity between coupling electrodes, the coupling capacity between the coupling electrode and a test material, and the resistance of the test material by feeding an AC current from two coupling electrodes to the test material and measuring total impedance at three frequencies.
CONSTITUTION: An AC current is fed from two coupling electrodes 2, 3 to a test material 1. The imaginary part of total impedance is measured using a high frequency AC power supply and the stray capacity CS between both coupling electrodes 2, 3 is measured. On the other hand, the imaginary part of total impedance is measured using a low frequency AC power supply and the coupling capacity CK between the coupling electrodes 2 or 3 and a test material 1 is determined while taking account of the stray capacity CS. Subsequently, the real part of total impedance is measured using an AC current between the high and low frequencies for minimizing the phase shift. Finally, the resistance R of the material 1 is determined while taking account of the stray capacity CS and the coupling capacity CK. In order, to enhance the measurement accuracy furthermore, the test material 1 may be measured using two electrodes separated by different distances therefrom.
Inventors:
URURITSUHI PINGERU
HANSU HAA NORUTE
HANSU HAA NORUTE
Application Number:
JP7763591A
Publication Date:
September 18, 1996
Filing Date:
April 10, 1991
Export Citation:
Assignee:
FLACHGLAS AG
International Classes:
G01N27/02; B60S1/08; G01R27/00; G01R27/02; G01R27/22; (IPC1-7): G01N27/02; G01R27/02
Domestic Patent References:
| JP26356Y2 |
Attorney, Agent or Firm:
Tajiro Taiji