Performance of microbolometer focal plane arrays under varying pressure

In this letter, we present a study of imaging using a 128/spl times/128-pixel microbolometer focal plane array (FPA) under varying pressure conditions from 10/sup -5/ torr to the ambient. We have employed bulk micromachining in the fabrication of FPA to reduce the thermal conduction through the air-...

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Bibliographic Details
Published in:IEEE electron device letters 2000-05, Vol.21 (5), p.233-235
Main Authors: He, X., Karunasiri, G., Mei, T., Zeng, W.J., Neuzil, P., Sridhar, U.
Format: Article
Language:English
Subjects:
Air gaps
Arrays
Biomembranes
Bolometers
Circuits
Fabrication
Focal plane
Image contrast
Low pressure
Micromachining
Microorganisms
Pressure
Resistors
Switches
Thermal conductivity
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Summary:In this letter, we present a study of imaging using a 128/spl times/128-pixel microbolometer focal plane array (FPA) under varying pressure conditions from 10/sup -5/ torr to the ambient. We have employed bulk micromachining in the fabrication of FPA to reduce the thermal conduction through the air-gap between the membrane and the substrate of the microbolometers. It was found that an image of a soldering iron (200/spl deg/C) was clearly visible even at the ambient pressure. However, at ambient pressure, the increased in thermal conductance resulted in a reduction of contrast of the image compared to the ones obtained at low pressure. The results suggest the possibility of operation of uncooled FPA's under ambient pressure by proper design of the microbolometer structure.
ISSN:0741-3106
1558-0563
DOI:10.1109/55.841306