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A wireless and passive low-pressure sensor.

Pascal Nicolay¹, Martin Lenzhofer²

¹Carinthian Tech Research (CTR AG), Villach/St. Magdalen 9524, Austria. pascal.nicolay@ctr.at.

Sensors (Basel, Switzerland)

|February 20, 2014

Summary

This study presents a novel wireless, passive low-pressure sensor. While effective, its slow response time can be significantly improved through design modifications.

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Area of Science:

Physics
Materials Science
Sensor Technology

Background:

Traditional pressure sensors often require wired connections and active power sources.
Developing passive and wireless sensors is crucial for remote and challenging environments.

Purpose of the Study:

To introduce and evaluate a prototype of a passive, wireless low-pressure sensor.
To model the sensor's behavior and identify areas for performance enhancement.

Main Methods:

The sensor utilizes a heat conductivity gauge principle.
It incorporates a wireless and passive Surface Acoustic Wave (SAW) temperature sensor.
Inductive coupling is employed for sensor heating, and testing was conducted in a vacuum chamber.

Main Results:

The prototype demonstrated a drastic and reproducible change in equilibrium temperature with applied pressure steps.
A significant limitation was identified as a very long response time.
A model was developed to explain the sensor's performance characteristics.

Conclusions:

The developed sensor shows promise as a passive, wireless low-pressure monitoring device.
The provided model indicates that response time can be substantially improved with basic design changes.
Further research can optimize the sensor for faster and more efficient pressure sensing.