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Frequency response of multilayer pyroelectric sensors
1School of Electrical and Computer Engineering, Inha Research Institute of Semiconductor and Thin Film Technology, Inha University, Inchon 402-751, Korea.
Summary
This study presents a model for pyroelectric sensor response, detailing how geometric and thermophysical properties influence performance across various configurations. It reveals conditions for achieving a wide, flat frequency response in detectors with and without air gaps.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Sensor Technology
Background:
- Pyroelectric sensors are crucial for detecting infrared radiation and temperature changes.
- Understanding the pyroelectric response in multilayer systems is complex due to varying configurations.
- Optimizing sensor performance requires detailed analysis of geometric and thermophysical parameters.
Purpose of the Study:
- To develop a general expression for the pyroelectric response of multilayer systems.
- To establish relations between system parameters and pyroelectric response characteristics.
- To analyze performance variations in different pyroelectric sensor configurations.
Main Methods:
- Calculation of the pyroelectric response for a multilayer system (front surroundings, pyroelectric element, intermediate layer, back surroundings).
- Derivation of general expressions and simplified relations for pyroelectric response characteristics.
- Analysis of various sensor configurations including gas-filled, air-gap, and immersion systems.
Main Results:
- A unified model for pyroelectric response in diverse sensor designs.
- For air-gap detectors, a wide, flat frequency response is achieved if the air gap's thermal resistance is double that of the pyroelectric element, irrespective of substrate properties.
- For detectors without an air gap, this response characteristic is contingent upon the substrate possessing relatively large complex thermal conductivity.
Conclusions:
- The study provides a comprehensive framework for understanding and designing pyroelectric sensors.
- Key parameters governing the frequency response of pyroelectric detectors have been identified.
- Design guidelines are established for optimizing pyroelectric sensor performance based on specific application requirements.
