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US 12,730,034 B2Granted
Measuring device, measuring method, and computer-readable recording medium
AssigneeYokogawa Electric Corporation
InventorYoshihiro Kumagai
Life of this patent
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Abstract
An optical fiber characteristic measuring device acquires a Brillouin Frequency Shift (BFS) from a measuring position of an optical fiber disposed in an object to be measured, generates temperature distribution in a longitudinal direction of the optical fiber by converting the acquired BFS into a temperature, calculates a physical property change of the optical fiber based on the generated temperature distribution, and corrects the measuring position of the optical fiber based on the calculated physical property change.
Claims7
A measuring device comprising:
- at least one processor;
- and
- a memory storing instructions that, when executed by the at least one processor, cause the at least one processor to perform operations, the operations comprising:
- acquiring each Brillouin Frequency Shift from each measuring position of an optical fiber disposed in a measuring object;
- generating a temperature distribution in a longitudinal direction of the optical fiber by converting each Brillouin Frequency Shift into a temperature;
- specifying a high-temperature section having a temperature equal to or higher than a predetermined temperature of the optical fiber from the temperature distribution;
- converting a temperature into a refractive index for each specified high-temperature section, and generating a refractive index distribution in the longitudinal direction of the optical fiber;
- calculating a distance change in the longitudinal direction of the optical fiber due to thermal expansion for each specified high-temperature section;
- calculating a measuring position displacement amount between the measuring position and an actual measuring position from the refractive index distribution for each high-temperature section;
- and
- correcting each measuring position of the optical fiber based on the calculated measuring position displacement amount and the calculated distance change.
8 more elements
A measuring method comprising:
- acquiring each Brillouin Frequency Shift from each measuring position of an optical fiber disposed in a measuring object;
- generating a temperature distribution in a longitudinal direction of the optical fiber by converting each Brillouin Frequency Shift into a temperature;
- specifying a high-temperature section having a temperature equal to or higher than a predetermined temperature of the optical fiber from the temperature distribution;
- converting a temperature into a refractive index for each specified high-temperature section, and generating a refractive index distribution in the longitudinal direction of the optical fiber;
- calculating a distance change in the longitudinal direction of the optical fiber due to thermal expansion for each specified high-temperature section;
- calculating a measuring position displacement amount between the measuring position and an actual measuring position from the refractive index distribution for each high-temperature section;
- and
- correcting each measuring position of the optical fiber based on the calculated measuring position displacement amount and the calculated distance change.
5 more elements
A non-transitory computer-readable recording medium having stored therein a measuring program that causes a computer to perform processing comprising:
- acquiring each Brillouin Frequency Shift from each measuring position of an optical fiber disposed in a measuring object;
- generating a temperature distribution in a longitudinal direction of the optical fiber by converting each Brillouin Frequency Shift into a temperature;
- specifying a high-temperature section having a temperature equal to or higher than a predetermined temperature of the optical fiber from the temperature distribution;
- converting a temperature into a refractive index for each specified high-temperature section, and generating a refractive index distribution in the longitudinal direction of the optical fiber;
- calculating a distance change in the longitudinal direction of the optical fiber due to thermal expansion for each specified high-temperature section;
- calculating a measuring position displacement amount between the measuring position and an actual measuring position from the refractive index distribution for each high-temperature section;
- and
- correcting each measuring position of the optical fiber based on the calculated measuring position displacement amount and the calculated distance change.
5 more elements
Dependencies are inferred from the claim text.