Fiber Bragg grating pressure sensor capable of monitoring positive and negative pressure and testing method

Abstract

The invention discloses a fiber bragg grating pressure sensor capable of achieving positive and negative pressure monitoring and a testing method. The fiber bragg grating pressure sensor comprises a connector, a filter screen, a base, an outer shell, a corrugate pipe, a first fiber bragg grating, a second fiber bragg grating, an optical fiber, an optical cable connector, an armored optical cable, a brace, a flange plate, an outer shell cover and a strain beam, wherein the outer shell cover is used for protecting the optical fiber from a sealing glue sealing part to an optical cable connector part, and the strain beam is used for applying prestress. The fiber bragg grating pressure sensor capable of achieving the positive and negative pressure monitoring and the testing method are suitable for the monitoring of pressure safety of oil and gas pipelines, urban underground gas pipelines, heating power pipelines, water supplying pipelines, oil tank pipelines, oil conveying pipelines and other pipe networks, the potential safety hazards that an electronic sensor is electrified and is unsafe in nature are eliminated, and meanwhile the capacity of phases is also improved greatly; the fiber bragg grating pressure sensor is applied to the aspect of real-time online monitoring of coal and rock mass gas pressure, errors caused by single data monitoring are avoided, the sensitivity and the accuracy of the system are improved, manpower, material resources and time are saved, and meanwhile the danger probably brought by personnel on site can be avoided.

Description

technical field [0001] The invention relates to a sensor, in particular to an optical fiber grating pressure sensor with a corrugated tube structure capable of realizing positive pressure and negative pressure monitoring with high precision and a testing method, and is especially suitable for coal mine safety monitoring gas pressure monitoring and chemical pipeline pressure monitoring. Background technique [0002] With the rapid development of my country's petroleum, chemical, coal, metallurgy and other industries, the workplaces of various flammable and toxic gases produced along with industrial production are also increasing. In particular, the leakage of flammable and toxic gases may occur in the production process and storage and transportation of petroleum, chemical, metallurgical and other enterprises. The biggest disadvantage of electronic sensors monitoring flammable and explosive gases (liquids) is the short service life of the sensors, especially the electronic se...

AI Technical Summary

Problems solved by technology

Among them, the Bourdon tube type has the disadvantages of poor resolution, high processing precision requirements of the Bourdon tube, difficult fiber grating packaging, and large drift; the cylindrical thin-walled structure has poor resolution, and the small-range sensor has too large a size and sensitivity. Low, difficult to achieve negative pressure monitoring and other shortcomings

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