High-Linearity Wireless Passive Temperature Sensor Based on Metamaterial Structure with Rotation-Insensitive...

Area of Science:

• Materials Science
• Electrical Engineering
• Physics

Background:

• Accurate temperature monitoring of moving components is crucial in many industrial applications.
• Existing sensors may face limitations in wireless, non-contact, or harsh environment measurements.

Purpose of the Study:

• To develop and characterize a novel wireless passive temperature sensor.
• To enable non-contact temperature measurement of moving and rotating parts.

Main Methods:

• A metamaterial structure with a double split-ring resonator on an alumina substrate was designed.
• The temperature-dependent resonant frequency shift was wirelessly detected using an antenna.
• Sensor performance was evaluated across a temperature range of 25-135 °C.

Main Results:

• The sensor demonstrated a high temperature sensitivity of 205.22 kHz/°C.
• A strong linear response was observed with R² = 0.995.
• The sensor showed insensitivity to rotation angle and included a distance warning functionality for overheating detection.

Conclusions:

• The proposed metamaterial-based sensor is effective for wireless, passive temperature measurement of moving parts.
• Its robustness and additional safety features make it suitable for industrial applications.
• This technology offers a promising solution for real-time temperature monitoring in challenging environments.