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| Responses of a ferroelectric thin film under infrared radiation |
| Revised:August 31, 2004 |
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| DOI：10.7511/jslx20064080 |
| KeyWord:ferroelectric thin film,microbolometer pixel structure,composite laminate plate,infrared radiation,finite element method |
| LI Yao-chen YANG Cang-jin WANG Kan-lei MENG Xiang-jian SUN Jing-lan |
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| Abstract: |
| The response of a microbolometer pixel structure,the essential component part in an infrared focal planar array of an infrared detector,to an infrared radiation was analyzed.The pixel structure was modeled as a composite laminate thin plate.Its middle ply was a PZT ferroelectric thin film.Its top surface,the infrared absorber,was covered with gold,while the bottom surface was deposited with reflection metal: platinum.Meanwhile both surfaces were a pair of electrodes.The thermal-electric-mechanical coupling variational principles were established based on the governing equations.The finite element equations for composite laminate plates with the Mindlin assumption,corresponding to the variational principles,were formulated.Taking the example that a tank on a sand ground was detected from the air at night,the displacement,temperature change and electric output signals of the microbolometer pixel structure were simulated by means of the finite element method.The results from the simulation were analyzed. |
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