Single-ended dual-wavelength high-precision distributed optical fiber temperature sensor

Abstract

The invention discloses a single-ended dual-wavelength high-precision distributed optical fiber temperature sensor, and belongs to the technical field of optical fiber sensing. In the single-ended dual-wavelength high-precision distributed optical fiber temperature sensor, two light sources with different wavelengths are connected to a pulse driver to ensure that the required precision of spatial resolution is achieved while the required pulse light energy is provided by utilizing the pulse widths of the two light sources. Therefore, the problem that the spatial resolution cannot meet the required precision in the prior art is solved, and the single-ended dual-wavelength high-precision distributed optical fiber temperature sensor is suitable for places with high precision requirement, such as petrochemical pipelines, electric high-voltage switches and the like.

Description

technical field [0001] The invention relates to the technical field of optical sensing, in particular to a design scheme of a single light source double-terminal input detection type distributed optical fiber temperature sensor. Background technique [0002] Since the advent of distributed fiber optic temperature sensors, many commercial products have appeared so far, but the achieved indicators still cannot meet the requirements in many occasions. Especially for the measurement accuracy and the spatial resolution of the defense zone of the distributed optical fiber temperature sensor, the current measurement accuracy and the highest index level of the defense zone spatial resolution correspond to 1°C and 0.1m, and most of them are still in the research and development stage. [0003] The basic principle of the optical fiber sensor is: the light emitted by the light source enters the modulation area through the optical fiber. Under the action of the measured object, the opti...

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Problems solved by technology

[0005] In recent years, the spatial resolution technology of distributed optical fiber Raman temperature sensor products has reached 1m, but it still cannot meet the application requirements of decimeter-level spatial resolution in the fields of petrochemical pipelines, power high-voltage switches, and power cable thermal protection. The temperature can be measured by the point probe of the fiber winding, but the randomness of the heated area cannot be predicted

On the other hand, the temperature measurement accuracy of distributed optical fiber Raman temperature sensor products has reached less than 1°C, but it still cannot meet the needs of petrochemical reactions at 0.1°C

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