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High-temperature shear-type vibration sensor based on langasite piezoelectric crystal.

Xiaorui Liang1,2,3, Wenhua Cheng1,2, Shuang Li1,2

  • 1State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan, 030051, China.

Heliyon
|October 21, 2024
PubMed
Summary

A new Langasite (LGS) shear vibration sensor monitors aero-engine structures at 750°C. This high-temperature sensor ensures flight safety with reliable, real-time vibration data, even in harsh conditions.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Aero-engines operate under extreme temperatures and speeds, necessitating real-time vibration monitoring for flight safety.
  • Existing sensors face interference issues, reducing effectiveness and equipment lifespan.
  • High-temperature structural monitoring is crucial for preventing failures in demanding environments.

Purpose of the Study:

  • To design and produce a shear vibration sensor capable of real-time structural monitoring at 750°C.
  • To evaluate the high-temperature performance and reliability of the developed sensor.
  • To propose a method for accurate acceleration measurement by decoupling temperature effects.

Main Methods:

  • A shear vibration sensor was fabricated using a Langasite (LGS) crystal.
  • Sensor performance was tested across frequency (80-1000 Hz), acceleration (0.5-5g), and temperature (30-750°C) ranges.
  • A temperature-vibration cross-decoupling approach was implemented for acceleration determination.

Main Results:

  • The sensor demonstrated linearity below 1% and average sensitivity of 0.074 V/g across the temperature range.
  • Sensitivity fluctuation was less than 2% at different temperatures, indicating good viability in high-temperature environments.
  • The cross-decoupling method achieved a maximum inaccuracy of 4.54% compared to reference acceleration.

Conclusions:

  • The developed LGS sensor is suitable for real-time monitoring in high-temperature environments, meeting application requirements.
  • The sensor's small size, ease of installation, and high reliability are advantageous for engine health assessment and fault prediction.
  • This LGS acceleration sensor presents a viable alternative for critical structural monitoring in demanding applications like aero-engines.