Pull-rod fiber bragg grating osmometer

Abstract

The invention relates to a pull-rod fiber bragg grating osmometer, comprising a housing. Two ends of the housing are respectively provided with an end cover with holes, a pressure membrane is arranged between one end in the housing and the end cover, the inner wall of the housing is provided with a grating support frame, and a pressure guide rod is arranged in the housing; one end of the pressureguide rod is cohered to the pressure membrane, and the other end thereof is fixedly connected with one end of a pressure measuring grating; the other end of the pressure measuring grating is fixed onthe grating support frame; the grating support frame is provided with a temperature compensation grating; the other end of the temperature compensation grating is in a free state; and the pressure measuring grating and the temperature compensation grating are both led out from the holes of the end cover arranged on one end of the housing via optical fiber. Based on all-optical signal design, the invention has no electronic devices, has favourable water-proof performance, has no electric spark hidden danger and has the function of anti-electromagnetic interference. By adopting corrugated membranes and two pressure measuring gratings, the invention improves measuring precision and measuring reliability. The invention is convenient for networking, and can realize quasi-distributed real-time monitoring.

Description

technical field [0001] The invention relates to an intelligent sensor for simultaneous measurement of osmotic pressure and temperature. Specifically, it is a rod-type optical fiber grating piezometer with temperature compensation function. Background technique [0002] At present, in engineering fields such as tunnels, dams, subways, coal mines and oil fields, electric piezometers are mostly used to measure pore water pressure. The traditional electric piezometer has low measurement accuracy, large volume, poor waterproof performance, short life, easy discharge, and susceptible to electromagnetic interference, which seriously limits its wide application. [0003] Fiber Bragg Grating is a temperature and stress sensor with excellent performance. Since people use Fiber Bragg Grating for sensing, Fiber Bragg Grating sensors have brought new challenges to traditional electrical sensors with their unique advantages. Compared with traditional electrical sensors, it has unique ad...

AI Technical Summary

Problems solved by technology

[0004] In the field of practical engineering, long-term and accurate detection of pore water pressure is required. At present, there are few reports on high-sensitivity fiber grating osmotic pressure sensors based on corrugated diaphragms, and no related patents have been seen.

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