SHAKING DISPLACEMENT MEASURING INSTRUMENT FOR STRUCTURE

PROBLEM TO BE SOLVED: To solve the problem that a conventional shaking displacement measuring instrument for a structure costs a lot since many optical cameras are needed. SOLUTION: This shaking displacement measuring instrument for the structure is equipped with radio wave transmitters 2 which send radio waves of mutually different frequency, antennas 3, a band-pass filter 7 which discriminates signals received by the antennas 3 by the radio waves sent from the radio wave transmitters 2, a phase difference detecting means 8 which detects the phase difference between the radio waves received by two antennas 3, and a position measuring and calculating means 9 which estimates the positions of the radio wave transmitters 2 by finding three points of intersection of isophase difference planes.