High-sensitivity temperature-independent differential pressure sensor using fiber Bragg gratings

Area of Science:

• Optoelectronics
• Sensor Technology
• Materials Science

Background:

• Accurate differential pressure measurement is crucial for industrial processes.
• Existing sensors often suffer from temperature cross-sensitivity, limiting their application range.
• Fiber Bragg gratings (FBGs) offer potential for robust and sensitive measurements.

Purpose of the Study:

• To develop and demonstrate a novel fiber Bragg grating (FBG) based differential pressure sensor.
• To achieve temperature independence in the differential pressure measurement.
• To enable simultaneous measurement of differential pressure and temperature.

Main Methods:

• Utilized a novel packaged-structure design for the FBG sensor.
• Experimentally demonstrated the sensor's performance.
• Investigated the sensor's response to differential pressure and temperature variations.

Main Results:

• Achieved a high differential pressure sensitivity of 821.87 nm/MPa.
• The sensor exhibited temperature-independent performance for differential pressure measurement.
• Demonstrated the capability for simultaneous measurement of temperature and differential pressure.

Conclusions:

• The developed FBG sensor provides a high-sensitivity, temperature-independent solution for differential pressure monitoring.
• The sensor's dual-measurement capability makes it suitable for applications like liquid level, density, and specific gravity detection.
• This technology offers a promising advancement in optical sensing for industrial and scientific applications.