Mini distributed fiber temperature measuring calibration device and method

Abstract

The invention discloses a mini distributed fiber temperature measuring calibration device and method. The calibration device comprises a casing; an upper panel of the casing can be opened and closed, and is provided with through holes through which tested fibers can penetrate; the casing is internally provided with a detachable fiber winding column; the bottom of the casing is provided with heating resistance wires; the casing is internally provided with a heat-transfer fluid working medium and a temperature sensor; and the temperature sensor and the heating resistance wires are connected with a controller of the calibration device. A distributed temperature measuring device calibrate the fiber temperature coefficient in a miniaturized manner within the range from normal temperature to 200 DEG C, and the test device can be used to realize calibration and demonstration of a test site.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensor calibration, in particular to a miniaturized distributed optical fiber temperature measurement calibration device and a calibration method. Background technique [0002] In the optical fiber sensing system, the distributed optical fiber temperature measuring device (ROTDR for short) is the most mature distributed optical fiber sensor at present. It is related to the material, which is the physical parameter of the optical fiber itself, which cannot be directly tested, but can only be obtained through ROTDR indirect testing and calibration. At present, the spatial resolution index of ROTDR is mostly ≥1m. Therefore, if it is necessary to obtain the temperature coefficient of the optical fiber required by the distributed optical fiber temperature measurement device, the optical fiber with a length of more than 1m must be uniformly heated to meet the calibration requirements. ...

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Problems solved by technology

[0003] At present, high and low temperature thermostats or constant temperature water tanks are often used for calibration. The high and low temperature thermostats are bulky, and it is difficult to calibrate the temperature coefficient of the temperature-sensitive optical cable in the field of optical cable laying. The user can only provide the optical fiber in advance for calibration, and the steps are cumbersome. , Calibration and transportation also take a long time, affecting the promotion of the instrument and the use of users; and using a constant temperature water tank to calibrate the temperature coefficient of the temperature-sensing optical cable, because the maximum temperature of the water tank can only reach 100 ° C, and the temperature coefficient of ROTDR is not linear , using the temperature coefficient calibrated at room temperature to 100°C, there will be a large error when testing at a higher temperature (such as 100-200°C), which will affect the test results

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