APPARATUS AND METHOD FOR MEASURING TENSILE FORCE THROUGH AUTO COMPENSATIVE TYPE EM SENSOR

摘要

PURPOSE: An apparatus and a method for measuring tensile force are provided to precisely measure tensile force applied to a structure by utilizing a measurement EM sensor and a reference EM sensor. CONSTITUTION: A tensile force measuring apparatus includes a signal generator(10) for generating a sine wave and a power amplifier(11) for amplifying the sine wave. A measurement EM sensor(15) is installed on a supporting member(13a) and has a primary coil(13a) receiving current from the power amplifier(11) and a secondary coil(14a). Voltage is applied to the secondary coil(14a) of the measurement EM sensor(15) due to magnetic force generated from the primary coil(13a). A reference EM sensor(17) is installed on the supporting member(12a) and has a primary coil(13b) receiving current from the power amplifier(11) and a secondary coil(14b). A preamplifier and an RMS transformer(19) are provided to connect the secondary coils(14a,14b) in series.