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A Study on the Responsivity of Four-Layer Pyroelectric Sensors

Published online by Cambridge University Press:  10 February 2011

Vladimir B. Samoilov ,
Seong Jun Kang ,
Dong Hoon Chang  and
Yung Sup Yoon
Vladimir B. Samoilov
Affiliation:
School of Electrical and Computer Engineering, Inha University, Inchon 402-751, Korea
Seong Jun Kang
Affiliation:
School of Electrical and Computer Engineering, Inha University, Inchon 402-751, Korea
Dong Hoon Chang
Affiliation:
School of Electrical and Computer Engineering, Inha University, Inchon 402-751, Korea
Yung Sup Yoon
Affiliation:
School of Electrical and Computer Engineering, Inha University, Inchon 402-751, Korea
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Abstract

The temperature distribution under periodic thermal excitation and the pyroelectric response of a four-layer system consisting of front and back semi-infinite media, a pyroelectric element, and an intermediate layer are found. Numerical results and approximate expressions are obtained for special cases, such as a detector with an air gap between the pyroelectric layer and the bulk substrate and a detector on a substrate of finite thickness an air environment. The responsivities of detectors with a lead-lanthanum-titanate (PLT) sensing element on either a Si and a SiO2 substrate are calculated as functions of the pyroelectric layer and the underlying layer thicknesses. It is found that the detector with an air gap has a frequency-independent responsivity over a wide frequency range. A correlation is found between the type of frequency response in each frequency region and the corresponding dominant mechanism for heat loss.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 493: Symposium U – Ferroelectric Thin Film VI , 1997 , 487
Copyright
Copyright © Materials Research Society 1998

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References

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