Thermal and mechanical characterizations of a substrate-free focal plane array

Abstract

Thermal and mechanical characterizations of a substrate-free focal plane array *Cheng Teng(程 腾) a) , Zhang Qing-Chuan(张青川) a) † , Chen Da-Peng(陈大鹏) b) , Shi Hai-Tao(史海涛) a) , Gao Jie(高 杰) a) , Qian Jian(钱 剑) a) , and Wu Xiao-Ping(伍小平) a) a)

A holistic approach performance analysis of substrate-free focal plane array

“…When the unit size is small, most of the heat transmission occurs through conduction from the micro- cantilever leg to the frame, thus the increase in the frame temperature is notable. The temperature-constant substrate model is not appropriate for the substrate-free FPA when unit size decreases to 60 lm, 19 while for the substrate-free theoretical model, when unit size decreases from 200 lm to 50 lm, the disagreement between the experimental and the theoretical results is only 2.6%, 5.6%, and 5.4%. Hence, regardless of unit size, this model can be applied to substrate-free FPAs.…”

“…In the heated region of M Â M units, the temperature rise in the deformation leg and the absorber are about equal (93.3%) by FEA, 19 so that the potentials can be regarded as equal; with this assumption a more concise heat transfer circuit model is obtained (Figure 3(b)). Here, Q Mef f is the total heat energy absorbed by the absorbers and micro-cantilever legs of M Â M units, R Meff ;rad ¼ R Mleg;rad ==R Mabsorb;rad .…”

“…The average heat conversion efficiency is deduced by Eq. (4) 19) and the equivalent total thermal conductivity is…”

“…The theoretical temperature gray response of a substrate-free FPA can then be obtained based on the experimental optical readout responsivity DI Dh and the results of Eqs. (19) and (21). We have performed numerical FEA to validate the theoretical analytical model.…”

Frequency of genetic variants associated with epilepsy in pediatric patients

“…Epilepsies can result from primary genetic abnormalities or secondary to well-defined structural or metabolic disorders, some of which also have genetic causes. It is estimated that almost half of the epilepsies have a genetic basis [3].…”