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1 Structural Health Monitoring with Fiber Optic Deformation Sensor ( SOFO ) SOFO SOFO ( SOFO V ) ( SOFO Dynamic ) 2 SOFO The fiber optic deformation sensor, SOFO, has excellent characteristics such as ease of use, long gage, usable in concrete, high precision, long life and long-term stability and has therefore been applied to structural health monitoring in the area of civil engineering. This paper describes the principles of the SOFO V for static measurement and SOFO Dynamic for dynamic measurement. This paper also expresses results of applications to thermal expansion tests on steel pipes, static and dynamic loading tests in a bridge and monitoring of the axial stress at pillars in a high-rise building. Through these results, the performance of the SOFO system on the static and dynamic measurements was clarified. GPS SOFO ( 1 ) ( 7 ) SOFO Surveillance d' Ouvrages par Fibres Optiques SOFO SOFO V SOFO Dynamic 2 SOFO SOFO 2. 1SOFO V 1 SOFO V SOFO SOFO SOFO SOFO Vol.47 No.4 ( )

2 1 Fig. 1 SOFO SOFO SOFO Fig. 2 SOFO V 2 μm SOFO V 5 km SOFO cm 20 m SOFO V 2. 2SOFO Dynamic ( 2 ) 3 SOFO Dynamic SOFO V USB SOFO Dynamic 2 2 SOFO V Vol.47 No.4 ( )

3 1 Table 1 2 Table 2 μ μ μ μ μ 3 Fig. 3 SOFO Dynamic 2 SOFO Dynamic 0.01 μm SOFO SOFO 1 SOFO ( 2 μm ) SOFO SOFO SOFO SOFO SOFO ( 6 ) mm 700 mm 500 mm SOFO SOFO V 30 5 Vol.47 No.4 ( )

4 4 Fig. 4 α 5 Fig. 5 α SOFO a a a / ( ) SOFO 3. 2 ( 4 ) SOFO ( 8 ) 3 2 n n 4 P 4 i ( x ) ( i = 1, n ) 2 P 2 i ( x ) P 2 i ( x ) Bernoulli 1 x = ε( ) ( 1 ) rx ( ) y r x e y SOFO l 1 6 ( 1 ) 1 l2 l1 = rm l 1y ( ) ( 2 ) r m l 1 SOFO l 2 ( 2 ) 1 1 r m x dx l 1 6 Fig. 6 Vol.47 No.4 ( )

5 P 2 ( x ) 2 P 2 (x) = ax 2 + bx + c ( 3 ) P 2 ( x ) P 4 i ( x ) P 2 i ( x ) 2 P 4 i ( x ) α = 4 2 P (x) = P (x)dx+ x +b, (i 1, 2,, n) i i i i ( 4 ) ( 4 ) 2 n ( n - 1 ) ( n - 1 ) 2 2 n a i, b i P 4 i ( x ) m7.8 m SOFO ( 2 ) SOFO 1 r i 1 Dl = r i up Dl up Dl l d down ( 5 SOFO Dl down SOFO l SOFO L L L L L L L 7 Fig. 7 Vol.47 No.4 ( )

6 d SOFO SOFO G1 2 1 G1 1/4 L1/2 L3/4 L m SOFO ( CH1 CH6 ) 2 SOFO 900 mm 3 ( x = 0 : P 4 ( 0 ) = 0x = L : P L) 20 t CH1 CH2 3/4 L CH3 CH4 1/2 LCH5 CH6 1/4 L 8 SOFO SOFO 9 11 G1 1/4 L 1/2 L3/4 L 1/4 L 3/4 L SOFO 1/2 L 5 131/4 L 1 9 SOFO 6 9 L Fig. 9L 10 L Fig. 10L 11 L Fig. 11L 8 Fig. 8 1/4 L1/2 L3/4 L 3 SOFO 4.5 m 5 m 3 m 4 5 Vol.47 No.4 ( )

7 3. 3 ( 5) SOFO Dynamic kg kg 70 kg km/h kg 40 km/h km/h 80 km/h km/h 15 SOFO 12 Fig. 12 Vol.47 No.4 ( )

8 ( a ) ( b ) ( c ) ( d )SOFO 13 Fig. 13 ( a ) ( b ) ( c ) ( d )SOFO 14 Fig. 14 Vol.47 No.4 ( )

9 ( a ) ( c ) ( b ) ( d ) SOFO 15 Fig Hz Hz 40 km/h SOFO 9 μe ( ) SOFO 6 μe ( ) μe ( ) 2. 3 SOFO km/h 13 SOFO 10 SOFO ( WIMWeighing in motion ) 3. 4 ( 3 )( 7 ) m SOFO Vol.47 No.4 ( )

10 ( a ) ( b ) ( c ) ( d ) SOFO 16 Fig SOFO ( X4Y2X4Y5X6Y5X7Y9 X8Y6 ) 1 1 SOFO X7Y9 17 ( 3 m ) SOFO 1 m SOFO SOFO V SOFO Fig Vol.47 No.4 ( )

11 ( a ) ( b ) ( c ) ( d ) Fig. 18 ( e ) ( f ) ( g ) Fig Fig SOFO Dynamic m/s X6Y SOFO 1 μm Hz Vol.47 No.4 ( )

12 21 Fig. 21 SOFO ( 9 ) ( 12 ) SOFO SOFO ( 12 ) SOFO 22 Fig. 22 SOFO SOFO ( SOFO ) Vol.47 No.4 ( )

13 Vol.47 No.4 ( )

) km 200 m ) ) ) ) ) ) ) kg kg ) 017 x y x 2 y 5x 5 y )

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