Two-layer oil tank leakage detection optical fiber unit sensor

Abstract

The invention discloses a two-layer oil tank leakage detection optical fiber unit sensor comprising a first light source, a second light source, a light transmission optical fiber, a sensor head, a first light detector and a second light detector. The first and second light sources and the first and second light detectors are integrated on a processing circuit; the light transmission optical fiber includes a first incident optical fiber between the first light source and the sensor head, a second incident optical fiber connected between the second light source and the sensor head, a first emergent optical fiber connected between the sensor head and the first light detector and a second emergent optical fiber connected between the sensor head and the second light detector; the sensor head comprises a sensor housing with a first cavity and a second cavity which are arranged independently, a first floating ball with the density smaller than the minimum density of gasoline and a second floating ball with the density which is larger than the maximum density of diesel and which is smaller than the water density. Thus, the internal and external tank leakages can be distinguished, accurate reminding can be provided to maintainers, and the detection safety is improved.

Description

technical field [0001] The invention relates to a sensor, in particular to an optical fiber combined sensor for leak detection of a double-layer oil tank. Background technique [0002] At present, the country is vigorously promoting the use of double-layer oil tanks in gas stations. The double-layer oil tank is composed of an inner tank and an outer tank that covers the inner tank. A through gap (that is, an interlayer) is formed between the inner tank and the outer tank. There is a leak detection tube that communicates with the interlayer. Sensors at the bottom of the tubes detect leaks in the double-wall tanks to reduce the risk of environmental contamination. [0003] CN203975644U discloses a kind of anti-leakage double-layer oil tank, which describes that the leak detection pipe connected by the interlayer between the inner tank and the outer tank is provided with a sensor, and after a leak occurs inside the oil tank body, the sensor can sense the flow direction of the ...

AI Technical Summary

Problems solved by technology

There are two problems in this detection: (1) The sensor adopts an electronic sensor, and the electronic sensor is directly installed at the bottom of the leak detection tube (in the interlayer). When oil leaks, there is a risk of explosion

(2) Generally, when the inner tank leaks or both the inner and outer tanks leak, the double-layer oil tank needs to be replaced, and if only a part of the outer tank leaks, only the outer tank can be repaired without replacing the double-layer oil tank; however, the above sensors It can only detect whether there is a leak, but cannot distinguish whether the inner tank is leaking, the outer tank is leaking, or both are leaking, and it cannot give accurate alarm reminders to maintenance personnel

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