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- Title
A direct method of thermal time constant measurement for lithium tantalate based terahertz pryroelectric detectors.
- Authors
Li, Weizhi; Liang, Zhiqing; Wang, Jun; Gou, Jun; Jiang, Yadong
- Abstract
Thermal time constant ( τ ) is one of the most important parameters of pyroelectric detectors (PEDs). However, unlike other parameters such as voltage responsivity ( R ), noise equivalent power and specific detectivity ( D*), measurement of τ of lithium tantalate (LT) based PEDs was seldom reported in literatures. In this work, a convenient direct method for the measurement of τ was presented according to theoretical analysis and simulation result. Afterwards, this method was successfully applied to practical measurement of a homemade current mode terahertz (THz) LT based PED, of which τ was measured to be about 882 ms. To verify the measured result, τ was also calculated from the measured voltage-time curves according to its theoretical expression, which agrees well with the measured one. Compared with indirect measurement of τ through frequency response curves of PEDs, the direct method is simpler and more accurate. Furthermore, this method suggested an easy way for the measurement of pyroelectric coefficient of PEDs.
- Subjects
LITHIUM tantalate; PYROELECTRIC detectors; TERAHERTZ materials; ELECTRIC potential; PIEZOELECTRICITY
- Publication
Journal of Materials Science: Materials in Electronics, 2016, Vol 27, Issue 10, p9996
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-016-5070-8