Optical fiber temperature distribution measurement system and optical fiber temperature distribution measurement method

An optical fiber temperature distribution measurement system configured to enable a light pulse to be incident on an optical fiber and to measure a temperature distribution in a unit of a spatial resolution zone based on a return light from the optical fiber, the system comprising:

• a data processor configured:
• to calculate a temperature distribution of first temperatures, which is obtained by a return light from a first optical fiber part laid down along a roller row, and a temperature distribution of second temperatures, which is obtained by a return light from a second optical fiber part laid down side by side with the first optical fiber part at a position more distant from the roller row than the first optical fiber part,
• to calculate a temperature difference for evaluation for each spatial resolution zone, the temperature difference for evaluation being is a difference between a sum of the first temperature of each spatial resolution zone and the first temperatures of a spatial resolution zone adjacent thereto and a sum of the second temperature of each spatial resolution zone and the second temperatures of the spatial resolution zone adjacent thereto, and
• to determine that an abnormality has occurred in a roller near the spatial resolution zone when the calculated temperature difference for evaluation exceeds a reference value.

An optical fiber temperature distribution measurement method of enabling a light pulse to be incident on an optical fiber and measuring a temperature distribution in a unit of a spatial resolution zone based on a return light from the optical fiber, the method comprising:

• calculating temperature differences between corresponding spatial resolution zones based on a first temperature distribution and a second temperature distribution, the first temperature distribution being obtained by a return light from a first optical fiber part laid down along a roller row, the second temperature distribution being obtained by a return light from a second optical fiber part laid down side by side with the first optical fiber part at a position more distant from the roller row than the first optical fiber part;
• calculating a temperature difference for evaluation for each spatial resolution zone, the temperature difference for evaluation is a difference between a sum of a first temperature of each spatial resolution zone and a first temperature of a spatial resolution zone adjacent thereto and a sum of a second temperature of each spatial resolution zone and a second temperature of the spatial resolution zone adjacent thereto, and
• determining that an abnormality has occurred in a roller near the spatial resolution zone when the calculated temperature difference for evaluation exceeds a reference value.