High-temperature-resistant gas pressure sensor based on an all-silica Fabry-Perot interferometer.

Area of Science:

• Optoelectronics
• Sensor Technology
• Materials Science

Background:

• High-temperature environments pose significant challenges for conventional gas pressure sensors.
• Accurate pressure monitoring is critical for safety and efficiency in various industrial applications.

Purpose of the Study:

• To develop and demonstrate a high-temperature-resistant gas pressure sensor.
• To investigate the performance of an all-silica Fabry-Perot interferometer (FPI) for pressure sensing in extreme thermal conditions.

Main Methods:

• Fabrication of an all-silica FPI structure using CO2 laser welding.
• Integration of a femtosecond laser-inscribed fiber Bragg grating for temperature compensation.
• Analysis of FPI cavity length changes correlated with gas pressure.

Main Results:

• The sensor demonstrated good linearity over a 0-14 MPa pressure range with a sensitivity of 58 nm/MPa.
• Achieved a high accuracy with an error of 0.8% full scale (F.S.).
• Stable gas pressure measurement (0-3.2 MPa) was confirmed in environments ranging from 25°C to 655°C.

Conclusions:

• The proposed all-silica FPI sensor offers a robust solution for high-temperature gas pressure measurement.
• Its compact design and stable performance indicate significant potential for applications in safety monitoring, energy, and geological exploration.