Sensitivity-Enhanced Fiber Bragg Grating Pressure Sensor Based on a Diaphragm and Hinge-Lever Structure

A high-sensitivity and small-size pressure sensor based on dual fiber Bragg grating (FBG), a diaphragm and hinge-lever structure is proposed. Its measurement principle is described and simulation analysis is conducted. We compensate for temperature cross-sensitivity by using an additional FBG to accurately measure the ambient temperature. Sensing experiments indicate that the pressure sensitivity is 5.227 pm/kPa within the range of 0-1.0 MPa, which is three times greater than that of a single-diaphragm pressure sensor without a flexible hinge lever. The sensor is suitable for accurate and stable pressure measurement in oil and gas pipelines and similar environments.

Automated summary

The proposed pressure sensor utilizes dual fiber Bragg grating, a diaphragm, and a hinge-lever structure to achieve high sensitivity and small size. It compensates for temperature cross-sensitivity by using an additional FBG to accurately measure ambient temperature. Sensing experiments show that the pressure sensitivity is 5.227 pm/kPa within the range of 0-1.0 MPa, making it suitable for accurate and stable pressure measurement in oil and gas pipelines.