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Large dynamic range pressure sensor based on two semicircle-holes microstructured fiber.

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A novel optical fiber pressure sensor offers high sensitivity and a wide dynamic range. This technology is ideal for harsh environments, including downhole applications up to 250°C.

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Accurate pressure sensing is critical in various industrial applications, especially in harsh environments.
  • Existing sensors often face limitations in sensitivity, dynamic range, or operational temperature.
  • Microstructured optical fibers (MOFs) offer unique properties for developing advanced sensing devices.

Purpose of the Study:

  • To develop and demonstrate a highly sensitive and large dynamic range pressure sensor.
  • To utilize a novel birefringence microstructured optical fiber (MOF) in a Sagnac interferometer configuration.
  • To evaluate the sensor's performance for high-pressure measurements in demanding conditions.

Main Methods:

  • Fabrication of a novel MOF with specific structural features (semicircle holes, germanium-doped core).
  • Deployment of the MOF in a Sagnac interferometer setup.
  • Experimental characterization of the sensor's pressure sensitivity, minimum detectable pressure, and dynamic range at 1550 nm.

Main Results:

  • The MOF exhibited significant group birefringence (calculated: 1.49 × 10⁻⁴, measured: 1.23 × 10⁻⁴ at 1550 nm).
  • The pressure sensor demonstrated high sensitivity ranging from 45,000 pm/MPa to 50,000 pm/MPa.
  • A minimum detectable pressure of 80 Pa and a dynamic range exceeding 116 dB were achieved.

Conclusions:

  • The novel birefringence MOF-based Sagnac interferometer sensor offers excellent performance for pressure measurement.
  • The sensor's robustness and high sensitivity make it suitable for harsh environments and downhole applications.
  • The technology shows promise for high-temperature (up to 250°C) pressure monitoring.