Small pitch high performance thermopile focal plane arrays

David Kryskowski

doi:10.1117/12.883710

21 May 2011 Small pitch high performance thermopile focal plane arrays

David Kryskowski

Proceedings Volume 8012, Infrared Technology and Applications XXXVII; 80123W (2011) https://doi.org/10.1117/12.883710
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

This paper will show that with our new readout approach, thermopile focal plane arrays can now reach the necessary LWIR performance levels that have been set by current microbolometer technology. Moreover, this paper shows that these new focal plane arrays can be made in commercial foundries using standard low cost CMOS. Besides improved performance, the additional benefit afforded by using these advanced thermopile focal plane arrays will be a simpler, more robust instrument. These attributes translate directly to lower cost and greater commercial potential. Detailed modeling shows that 25 μm, 17 μm and 12μm pitch thermopile focal plane arrays compare favorably in performance (NETD, τth) against microbolometer focal plane arrays with similar array size and detector geometry. The benefit of using thermopile focal plane arrays is the near elimination of 1/f noise and offset drift which has plagued microbolometers from their inception. Because of this noise reduction, shutterless operation should be possible. It is also shown that high performance thermoelectric materials are compatible with post- CMOS MEMS processes which, again, compares favorably to microbolometer focal plane arrays. Due to the potential lower system cost with thermoelectrics, these focal plane arrays could provide the path to deliver very low cost, high volume infrared imaging devices.

Citation Download Citation

David Kryskowski "Small pitch high performance thermopile focal plane arrays", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 80123W (21 May 2011); https://doi.org/10.1117/12.883710

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