Fiber-tip gas pressure sensor based on dual capillaries

Area of Science:

• Optoelectronics
• Fiber Optics Sensors
• Metrology

Background:

• Gas pressure measurement is crucial in various industrial and scientific fields.
• Existing sensors often face limitations in sensitivity, size, or cross-sensitivity.

Purpose of the Study:

• To propose and demonstrate a micro-cavity fiber Fabry-Perot interferometer for gas pressure sensing.
• To achieve high sensitivity and low detection limits in gas pressure measurements.

Main Methods:

• Fabrication of a dual-capillary micro-cavity fiber Fabry-Perot interferometer using fusion splicing.
• Employing a core-offset fusion splicing technique to enhance sensor performance.
• Analyzing the shift in the reflection spectrum with varying gas pressure.

Main Results:

• Achieved a high gas pressure sensitivity of 4147 pm/MPa.
• Demonstrated low temperature cross-sensitivity (< 0.3 KPa/°C at atmospheric pressure).
• Obtained an ultra-low detection limit of approximately 4.81 KPa.

Conclusions:

• The proposed dual-capillary fiber interferometer is a robust and compact sensor for precise gas pressure measurement.
• The core-offset fusion splicing method significantly improves the sensor's detection limit.
• The device shows great potential for reliable and highly sensitive gas pressure monitoring in specific locations.