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Updated: Apr 20, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Multi-frequency band pyroelectric sensors.

Chun-Ching Hsiao¹, Sheng-Yi Liu²

¹Department of Mechanical Design Engineering, National Formosa University, No. 64, Wunhua Rd., Huwei Township, Yunlin County 632, Taiwan. cchsiao@nfu.edu.tw.

Sensors (Basel, Switzerland)

|November 28, 2014

Summary

This summary is machine-generated.

This study introduces a novel dual-layer pyroelectric sensor using sputtered and aerosol zinc oxide (ZnO) for multi-frequency detection. The design enables sensing across a wide frequency range (4000-40,000 Hz) by optimizing layer thicknesses.

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Area of Science:

Materials Science
Sensor Technology
Nanotechnology

Background:

Pyroelectric sensors are crucial for detecting thermal variations.
Existing sensors often have limitations in frequency response range.
Zinc oxide (ZnO) is a promising material for pyroelectric applications due to its piezoelectric and pyroelectric properties.

Purpose of the Study:

To propose a methodology for designing a multi-frequency band pyroelectric sensor.
To develop a sensor capable of detecting subjects with various frequencies or velocities.
To investigate the use of dual pyroelectric layers for enhanced sensing capabilities.

Main Methods:

Designing a sensor structure with dual pyroelectric layers: a thin sputtered ZnO layer and a thick aerosol ZnO layer.
Analyzing the thermal capacity and response time of each layer to determine their suitability for high and low-frequency sensing.
Fabricating the multi-frequency band pyroelectric sensor with optimized layer thicknesses.

Main Results:

A dual-layer pyroelectric sensor was successfully designed, analyzed, and fabricated.
The thinner sputtered ZnO layer facilitated high-frequency sensing, while the thicker aerosol ZnO layer handled low-frequency sensing.
The fabricated sensor (1 μm sputtered ZnO, 20 μm aerosol ZnO) demonstrated effective sensing from 4000 to 40,000 Hz.

Conclusions:

The proposed dual-layer design effectively enables multi-frequency band detection in pyroelectric sensors.
Optimizing the thicknesses of sputtered and aerosol ZnO layers allows for estimation and tuning of the sensing frequency range.
This sensor technology offers a solution for applications requiring detection across a broad spectrum of frequencies without compromising response time or voltage responsivity.