A high-sensitivity fiber-optic F-P hydraulic pressure sensor based on a corrugated diaphragm structure

Area of Science:

• Optoelectronics
• Sensor Technology
• Materials Science

Background:

• Optical fiber hydraulic pressure sensors are crucial for disaster monitoring, chemical, petroleum, and biomedical applications.
• Existing sensors suffer from low sensitivity, limiting their effectiveness in critical monitoring scenarios.

Purpose of the Study:

• To develop a high-sensitivity optical fiber hydraulic pressure sensor.
• To address the limitations of current sensors by introducing a corrugated diaphragm structure.

Main Methods:

• Proposed a novel optical fiber Fabry-Perot (F-P) hydraulic pressure sensor.
• Utilized a corrugated diaphragm as the core sensing element.
• Formed the F-P cavity between the optical fiber end face and the diaphragm's smooth surface.
• Evaluated sensor performance using a micro-pressure sensing test system and downhole tests.

Main Results:

• The sensor demonstrated a pressure measurement range of 0-0.12 MPa.
• Achieved a high sensitivity of 874.74 μm/MPa.
• Exhibited a low hysteresis error of 0.1%.
• Verified consistent performance through practical downhole testing.

Conclusions:

• The developed corrugated diaphragm optical fiber hydraulic pressure sensor offers high sensitivity and reliability.
• The sensor's performance provides a valuable reference for future high-sensitivity optical sensor development.
• This technology has potential applications in various demanding industrial and scientific fields.