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High-sensitivity gas pressure sensor based on a multimode interferometer using hollow-core tube lattice fiber
Optics Letters
|August 16, 2020
Summary
A novel fiber optic gas pressure sensor uses a hollow-core tube lattice fiber (HC-TLF) for high-sensitivity measurements. This compact sensor offers rapid response and low temperature cross-sensitivity, ideal for harsh environments.
Area of Science:
- Fiber optics
- Optical sensing
- Interferometry
Background:
- Traditional pressure sensors face limitations in harsh environments.
- Developing robust, high-sensitivity sensors is crucial for industrial applications.
Purpose of the Study:
- To propose and demonstrate a non-diaphragm fiber gas pressure sensor.
- To investigate the optimal placement of side-holes for maximum sensitivity.
Main Methods:
- Fabrication of a sensor using a sandwich structure: graded-index multimode fiber, HC-TLF, and single mode fiber.
- Utilizing a femtosecond laser to drill side-holes in the HC-TLF for gas ingress/egress.
- Investigating the effect of side-hole position on gas pressure sensitivity.
Main Results:
- Achieved a high gas pressure sensitivity of 8.1 nm/MPa.
- Demonstrated a rapid average gas fill time of 2.2 s.
- Observed low temperature sensitivity (12.3 pm/°C) and cross-sensitivity (1.5 kPa/°C) up to 400°C.
Conclusions:
- The proposed HC-TLF based multimode interferometer sensor offers excellent performance.
- Its small size, rapid response, and low temperature cross-sensitivity make it suitable for high-pressure measurements in harsh conditions like downhole and ocean bottom environments.
