Ultrasonic test system, ultrasonic test method and aircraft structural object

1. An ultrasonic test system comprising:

an ultrasonic propagating body that changes at least one traveling direction of at least one ultrasonic wave which propagates through a region in a test target that is being tested for an anomaly and is received by the ultrasonic propagating body after propagating in the test target through the region; and

an optical fiber sensor that detects the at least one ultrasonic wave of which the at least one traveling direction has been changed by the ultrasonic propagating body, and

wherein the at least one ultrasonic wave is at least one Lamb wave; and

the ultrasonic propagating body has a structure in which an end portion of a cylindrical thin plate has been curved inside, an inside diameter and an outside diameter of the cylindrical thin plate gradually becoming small from a test target side toward an optical fiber sensor side, the end portion being in a side where the inside diameter and the outside diameter are small.

2. The ultrasonic test system according to claim 1 ,

wherein the at least one ultrasonic wave comprises ultrasonic waves which propagate in the test target from a plurality of directions; and

the ultrasonic propagating body changes traveling directions of the ultrasonic waves to a same direction according to reception directivity of the optical fiber sensor.

3. The ultrasonic test system according to claim 1 ,

wherein the ultrasonic propagating body changes the at least one traveling direction of the at least one ultrasonic wave to a length direction of the optical fiber sensor.

4. The ultrasonic test system according to claim 1 ,

wherein the optical fiber sensor is attached to the test target through the ultrasonic propagating body in a direction where a length direction of the optical fiber sensor is not parallel to a surface of the test target.

5. The ultrasonic test system according to claim 1 , further comprising:

an ultrasonic transducer that emits the at least one ultrasonic wave toward the test target and the ultrasonic propagating body; and

a signal processing system that detects a defect of the test target based on a detection signal of the at least one ultrasonic wave, the detection signal having been detected by the optical fiber sensor.

6. The ultrasonic test system according to claim 1 ,

wherein a thickness of the thin plate is not more than ½ of a wavelength of the at least one Lamb wave.

7. An aircraft structural object to which the ultrasonic test system according to claim 1 has been attached.

8. An ultrasonic test method utilizing the test system of claim 1 , comprising:

changing at least one traveling direction of at least one ultrasonic wave by disposing the ultrasonic propagating body on the test target that is being tested for an anomaly, the at least one ultrasonic wave propagating through the region being tested for an anomaly in the test target and being received by the ultrasonic propagating body after propagating in the test target through the region; and

detecting the at least one ultrasonic wave, of which the at least one traveling direction has been changed by the ultrasonic propagating body, with the optical fiber sensor.

9. The ultrasonic test system method according to claim 8 ,

wherein the optical fiber sensor is attached to the test target through the ultrasonic propagating body in a direction where a length direction of the optical fiber sensor is not parallel to a surface of the test target.

10. An ultrasonic test system comprising:

an ultrasonic propagating body that changes at least one traveling direction of at least one ultrasonic wave which propagates through a region in a test target that is being tested for an anomaly and is received by the ultrasonic propagating body after propagating in the test target through the region; and

an optical fiber sensor that detects the at least one ultrasonic wave of which the at least one traveling direction has been changed by the ultrasonic propagating body, and

wherein the at least one ultrasonic wave includes Lamb waves which propagate in the test target from a plurality of directions; and

the ultrasonic propagating body comprises thin plates of which each thickness direction is not perpendicular to a surface of the test target or of which an inclined angle of each thickness direction to the surface of the test target changes, the thin plates changing traveling directions of the Lamb waves respectively.

11. An ultrasonic test method utilizing the test system of claim 10 , comprising:

disposing the optical fiber sensor on a surface of a test target in a direction where a length direction of the optical fiber sensor is not parallel to the surface of the test target; and

detecting at least one ultrasonic wave by the optical fiber sensor, the at least one ultrasonic wave propagating through the region being tested for an anomaly in the test target and being received by an ultrasonic propagating body after propagating in the test target through the region.

12. The ultrasonic test system according to claim 10 ,

wherein

the ultrasonic propagating body changes traveling directions of the ultrasonic waves to a same direction according to reception directivity of the optical fiber sensor.

13. The ultrasonic test system according to claim 10 ,

wherein the ultrasonic propagating body changes the at least one traveling direction of the at least one ultrasonic wave to a length direction of the optical fiber sensor.

14. The ultrasonic test system according to claim 10 , further comprising:

an ultrasonic transducer that emits the at least one ultrasonic wave toward the test target and the ultrasonic propagating body; and

a signal processing system that detects a defect of the test target based on a detection signal of the at least one ultrasonic wave, the detection signal having been detected by the optical fiber sensor.

15. An aircraft structural object to which the ultrasonic test system according to claim 10 has been attached.

16. The ultrasonic test system according to claim 10 ,

wherein a thickness of each thin plate is not more than ½ of a wavelength of the at least one Lamb wave.