High-sensitivity fiber bragg grating pressure sensor based on square diaphragm

Abstract

The invention provides a high-sensitivity fiber bragg grating pressure sensor based on a square diaphragm. The high-sensitivity fiber bragg grating pressure sensor comprises a protection top cover which is provided with a lead-out hole for an optical fiber pigtail at the center of the top, a middle component which is provided with a square pressure bearing diaphragm for directly sensing an external oil gas pressure signal at a top surface, a stress transfer rod installed at the center of the square pressure bearing diaphragm, two vertical beams installed on the surface of a disc, cross beams installed at the free ends of the vertical beams, temperature measurement fiber bragg gratings installed on the upper surfaces of the cross beams, a pressure measurement fiber bragg grating installed between the stress transfer rod and the cross beams for applying certain prestress during packaging, a pressure port which is provided with a pressure conducting channel at the inner center and two clamping grooves formed in the bottom of the pressure port. The high-sensitivity fiber bragg grating pressure sensor provided by the invention has the characteristics of high sensitivity, the simple structure, small size, low cost and so on.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensing and detection, in particular to a high-sensitivity optical fiber grating pressure sensor based on a square diaphragm. Background technique [0002] Traditional electronic pressure transmitters, such as capacitive, piezoresistive, inductive, and piezoelectric resonance pressure transmitters, are the main sensors used for pressure monitoring of most oil and gas pipelines at this stage. Electronic pressure transmitters can convert the physical pressure parameters of external gases and liquids into standard electrical signals. During the signal transmission process, the electrical signal will be attenuated due to the impedance of the transmission line, and the transmitter is susceptible to interference under high temperature, high pressure, electromagnetic radiation and other environments. Electronic pressure transmitters have high nonlinearity and hysteresis errors, which will ...

AI Technical Summary

Problems solved by technology

In the case of the same size and processing material, compared with the square diaphragm, under the same pressure load, the central deflection of the circular diaphragm is lower, that is, its sensitivity to external pressure changes is lower.

Images