High-temperature impact-resistant multi-parameter sensor with wide dynamic range based on an L-shaped cantilever beam...

Area of Science:

• Materials Science
• Sensor Technology
• Mechanical Engineering

Background:

• Simultaneous monitoring of temperature, vibration, and strain is critical for assessing the operational status of engineering structures and equipment.
• Existing sensors often lack the robustness or wide dynamic range required for high-temperature and high-impact industrial applications.

Purpose of the Study:

• To develop a high-temperature, impact-resistant multi-parameter sensor capable of simultaneously measuring temperature, vibration, and strain.
• To enhance the stability and consistency of sensor operation in demanding environments.

Main Methods:

• Utilized an L-shaped cantilever beam structure as the core sensing element.
• Integrated a Fabry-Pérot (F-P) cavity fabricated via arc discharge for high-sensitivity vibration detection.
• Employed femtosecond laser inscription to create double fiber Bragg gratings (FBGs) for strain and temperature measurements.

Main Results:

• Achieved a high vibration sensitivity of 0.94 nm/g over a 0-70 g range with a wide frequency band (10-2000 Hz).
• Demonstrated a large strain measurement range of 0-3112 με.
• The sensor operates effectively in the temperature range of 25-600 °C.

Conclusions:

• The developed L-shaped cantilever beam sensor offers robust, simultaneous multi-parameter monitoring.
• Its wide dynamic range, high sensitivity, and impact resistance make it suitable for extreme environments.
• Potential applications include aerospace, oil exploration, and other critical industrial fields requiring reliable structural health monitoring.