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Temperature-compensated ocean pressure sensor based on dual Fabry-Perot interferometers by wavelength demodulation
Optics Express
|August 13, 2025
Summary
This study introduces a dual fiber-optic pressure sensor that accurately measures pressure even in extreme ocean environments by compensating for temperature changes. The novel sensor design ensures high precision and stability for dynamic pressure monitoring.
Area of Science:
- Optoelectronics
- Sensor Technology
- Environmental Monitoring
Background:
- Accurate pressure measurement is crucial for various applications, especially in harsh environments like the deep ocean.
- Existing sensors often struggle with temperature-induced errors, limiting their precision and reliability.
- Fiber-optic sensors offer advantages in remote sensing and immunity to electromagnetic interference.
Purpose of the Study:
- To propose and demonstrate a dual Fabry-Perot interferometric fiber-optic pressure sensor with integrated temperature compensation.
- To achieve high-precision dynamic pressure measurement in extreme ocean environments.
- To decouple the effects of pressure and temperature on sensor performance.
Main Methods:
- Integration of two Fabry-Perot sensors within a specialized encapsulation to create distinct pressure and temperature cavities.
- Cavity length demodulation of spectral data using a multi-extrema-tracing algorithm for pressure and temperature variation detection.
- Application of temperature compensation and error correction algorithms based on individual sensor temperature responses.
Main Results:
- The sensor system achieved a pressure sensitivity of -8.627 nm/MPa over a 0 MPa - 10 MPa range at 20°C.
- Nonlinearity and repeatability errors were minimal, equivalent to maximum pressure deviations of 5.085 Pa and 25.369 Pa, respectively.
- Individual sensor temperature sensitivities were 0.1848 nm/°C and 0.2575 nm/°C, enabling effective compensation.
Conclusions:
- The dual Fabry-Perot fiber-optic sensor effectively compensates for temperature variations, enhancing pressure measurement precision.
- The system exhibits excellent linearity, stability, and accuracy, making it suitable for dynamic pressure measurements in challenging conditions.
- This technology holds significant potential for applications in extreme ocean environments and other demanding fields.
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