Distributed optical fiber temperature measuring device and temperature measuring method for normal temperature conveying pipeline

Abstract

The invention relates to a distributed optical fiber temperature measuring device for a normal temperature conveying pipeline. The device comprises a conveying pipeline, a temperature sensing opticalcable, a heater and an outer pipeline; the conveying pipeline is used for conveying a normal temperature medium; the temperature sensing optical cable and the heater are laid in parallel with the conveying pipeline and are located below the conveying pipeline; the outer pipeline is used for sealing the conveying pipeline, the temperature sensing optical cable and the heater in a closed space; thetemperature sensing optical cable is connected with a DTS host; and the heater is a passive heat source. According to the distributed optical fiber temperature measuring device for the normal temperature conveying pipeline of the invention, the external pipeline can accumulate liquid, and the heater can perform quick heating, and therefore, faster and more accurate leak detection can be realized,and the possibility of false alarms can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of temperature sensing, and in particular relates to a distributed optical fiber temperature measuring device and a temperature measuring method for normal temperature transmission pipelines. Background technique [0002] As a new type of sensor, distributed optical fiber sensing technology has inherent advantages such as large capacity, long distance, high precision, and anti-interference, and has developed rapidly in recent years. Among them, the distributed optical fiber temperature sensing system (DTS) is the most successful representative of commercialization. It is based on the temperature sensitive effect (temperature difference) to realize the distributed monitoring of linear assets (such as cables, tunnels, pipelines). , High-temperature liquid leakage and high-pressure gas leakage and other application scenarios play a role. [0003] However, for pipelines transported at room temperature, because ...

AI Technical Summary

Problems solved by technology

However, there are many problems with this method. First, it increases energy consumption, and the passive advantages of optical fiber sensing no longer exist. Second, power cables increase safety risks and do not have the huge advantage of intrinsic safety of optical fiber sensors.

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