Optical sensor, optical temperature-measuring device and measuring method using the optical sensor

1. An optical sensor, comprising:

a sensing portion comprising an optical fiber comprising a holey fiber to be disposed at a measurement point of at least one of temperature, distortion, and pressure;

a light source to output a light to the sensing portion; and

a photodetector to detect a backscattered light from the sensing portion,

wherein the sensing portion comprises a tape sheet and the optical fiber shaped into a corrugated form with a curvature of a bend diameter greater than 10 mm.

2. The optical sensor according to claim 1 , wherein:

the tape sheet comprises flexibility.

3. The optical sensor according to claim 1 , wherein:

a plurality of the sensing portions are connected through a connection optical fiber.

4. The optical sensor according to claim 1 , wherein the optical fiber is buried in the tape sheet while being shaped in the corrugated form in the tape sheet.

5. The optical sensor according to claim 1 , wherein the holey fiber comprises a plurality of holes extending in a longitudinal direction of the holey fiber.

6. The optical sensor according to claim 1 , wherein the optical fiber has a predetermined cycle.

7. The optical sensor according to claim 1 , wherein the optical fiber has a predetermined cycle, and

a minimum bend diameter of the holey fiber is one-half of a length of the tape sheet corresponding to one predetermined cycle of the optical fiber.

8. The optical sensor according to claim 1 , wherein the optical fiber has the corrugated form before a pressure is applied.

9. The optical sensor according to claim 1 , further comprising a sensor body comprising said light source and said photodetector.

10. The optical sensor according to claim 1 , wherein said tape sheet comprises at least one of silicone resin and polymer material.

11. The optical sensor according to claim 1 , wherein said corrugated form comprises one of a sine wave and a zigzag.

12. The optical sensor according to claim 1 , wherein the optical fiber has a predetermined cycle, and

wherein a length of said predetermined cycle is 100 mm.

13. The optical sensor according to claim 1 , wherein said sensing portion is connected to a plurality of sensing portions by a connection optical fiber.

14. An optical temperature-measuring device, comprising:

a sensing portion comprising an optical fiber comprising a holey fiber to be disposed at a measurement point of temperature;

a light source to output a light to that sensing portion;

a photodetector to detect a Raman scattering light from the sensing portion; and

an electric circuit that is connected to the light source and the detector to process electrically the Raman scattering light and to display a temperature signal,

wherein the sensing portion comprises a tape sheet and the optical fiber shaped in a corrugated form with a curvature of a bend diameter greater than 10 mm.

15. The optical temperature measuring device according to claim 14 , wherein the optical fiber is fixed in a shape of the corrugated form on a surface of the tape sheet.

16. An optical temperature-measuring device, comprising:

a sensing portion comprising an optical fiber comprising a holey fiber to be disposed at a measurement point of temperature;

a light source to output a light to that sensing portion;

a photodetector to detect a Raman scattering light from the sensing portion; and

an electric circuit that is connected to the light source and the detector to process electrically the Raman scattering light and to display a temperature signal,

wherein the sensing portion comprises a polymer optical waveguide, and

wherein the polymer optical waveguide comprises a core shaped into a corrugated form with a predetermined curvature of a bend diameter greater than 10 mm.

17. A method of measuring a physical quantity change of a measured object, comprising:

disposing a sensing portion comprising a long optical fiber comprising a holey fiber near the measured object;

sending a light into the sensing portion; and

detecting a backscattered light generated from the sensing portion,

wherein the physical quantity change of the measured object is measured by using an optical sensor comprising the sensing portion that comprises a tape sheet and the optical fiber shaped in a corrugated form with a curvature of a bend diameter greater than 10 mm, and

wherein the sensing portion is wound in a spiral form around the measured object.

18. A method of measuring a physical quantity change of a measured object, comprising:

disposing a sensing portion comprising a long optical fiber near the measured object;

sending a light into the sensing portion; and

detecting a backscattered light generated from the sensing portion,

wherein the physical quantity change of the measured object is measured by using an optical sensor comprising the sensing portion that comprises a polymer optical waveguide comprising a core shaped into a corrugated form with a curvature of a bend diameter greater than 10 mm, and

wherein the sensing portion is wound in a spiral form around the measured object.