Phase interrogation used for a wireless passive pressure sensor in an 800 °C high-temperature environment

Area of Science:

• Materials Science
• Electrical Engineering
• Sensor Technology

Background:

• High-temperature environments pose significant challenges for accurate pressure monitoring.
• Existing pressure measurement systems often fail or require complex shielding at extreme temperatures.

Purpose of the Study:

• To develop and validate a wireless passive pressure measurement system for 800 °C environments.
• To analyze the impedance variations in a mutual coupling scenario between a read antenna and an LC resonant sensor.

Main Methods:

• A ceramic-based LC resonant sensor was designed and integrated into a wireless system.
• A readout device for impedance phase interrogation was utilized.
• The system was tested on a composite temperature-pressure platform, measuring sensor performance from room temperature to 800 °C.

Main Results:

• The wireless sensor system demonstrated good linearity (0.93%) and repeatability (6.6%).
• Hysteretic error was measured at 1.67%, with a sensor sensitivity of 374 KHz/bar.
• The system exhibited reliable pressure sensing performance up to 800 °C.

Conclusions:

• The proposed wireless passive pressure measurement system is effective for high-temperature applications.
• The system shows high engineering value and reliable performance in extreme thermal conditions.
• Further research can explore broader applications of this technology in harsh industrial settings.