METHOD AND DEVICE FOR TESTING GROUND ELEMENT

PURPOSE: To directly measure a resonant frequency and a Q value of a ground element without calibrating the same. CONSTITUTION: The frequency of a measuring signal supplied to a detection coil 2 is changed every constant time by a signal output part 1. A peak value of an induced voltage induced to a...

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Bibliographic Details
Main Authors AIKAWA OKIYASU, YOSHIZAWA TOSHIHIKO, OKADA YASUHIKO, YOSHINO FUMIO
Format Patent
LanguageEnglish
Published 12.04.1996
Edition6
Subjects
ENSURING THE SAFETY OF RAILWAY TRAFFIC
GUIDING RAILWAY TRAFFIC
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PERFORMING OPERATIONS
PHYSICS
RAILWAYS
TESTING
TRANSPORTING
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Summary:PURPOSE: To directly measure a resonant frequency and a Q value of a ground element without calibrating the same. CONSTITUTION: The frequency of a measuring signal supplied to a detection coil 2 is changed every constant time by a signal output part 1. A peak value of an induced voltage induced to a ground element based on the measuring signal is detected by a measuring part 3. A resonant frequency f0 is stored. At the same time, the coincidence of an induced voltage value obtained by multiplying the peak value by 1/√2 with the resonant frequency is detected. A frequency Δf of a difference between the coincident points (f2 , f1 ) is obtained, so that a Q value is measured from a formula of f0 /Δf.
Bibliography:Application Number: JP19940235046