We demonstrate a novel method for indium bump fabrication on a small CMOS circuit chip that is to be flip-chip bonded with a GaAs/A1GaAs multiple quantum well spatial light modulator. A chip holder with a via hole is ...We demonstrate a novel method for indium bump fabrication on a small CMOS circuit chip that is to be flip-chip bonded with a GaAs/A1GaAs multiple quantum well spatial light modulator. A chip holder with a via hole is used to coat the photoresist for indium bump lift-off. The 1000 μm-wide photoresist edge bead around the circuit chip can be reduced to less than 500 μm, which ensures the integrity of the indium bump array. 64 - 64 indium arrays with 20 μm-high, 30 μm-diameter bumps are successfully formed on a 5 - 6.5 mm^2 CMOS chip.展开更多
水下小型声探测系统因具有体积小、重量轻的特点易装载于航空反潜机动平台上。新型水下小尺寸扩展式基阵声探测系统不仅具有航空用探测设备的特点又兼具扩展后可以形成更大的孔径尺寸,有效地提高系统灵敏度、阵处理增益和定向精度等优势...水下小型声探测系统因具有体积小、重量轻的特点易装载于航空反潜机动平台上。新型水下小尺寸扩展式基阵声探测系统不仅具有航空用探测设备的特点又兼具扩展后可以形成更大的孔径尺寸,有效地提高系统灵敏度、阵处理增益和定向精度等优势,必将发展为现代反潜战中较为有效的探潜手段之一。结合研制的新型水下小尺寸扩展式基阵声探测系统,开展了工程用系统定向性能水池实验研究。系统设计前端基于模拟退火波束优化算法,中心频率下实测全景波束较优,逼近-30 d B期望旁瓣级的设计要求。后端通过合理的多波束比幅测向算法得到了较好的定向性能,能够满足<3°标准差的指标。实测的定向结果验证了该型水下小尺寸扩展式基阵声探测系统的工程实用性,也为进一步开展工程有效性和稳定性的研究提供了前期的实验参考。展开更多
文摘We demonstrate a novel method for indium bump fabrication on a small CMOS circuit chip that is to be flip-chip bonded with a GaAs/A1GaAs multiple quantum well spatial light modulator. A chip holder with a via hole is used to coat the photoresist for indium bump lift-off. The 1000 μm-wide photoresist edge bead around the circuit chip can be reduced to less than 500 μm, which ensures the integrity of the indium bump array. 64 - 64 indium arrays with 20 μm-high, 30 μm-diameter bumps are successfully formed on a 5 - 6.5 mm^2 CMOS chip.
文摘水下小型声探测系统因具有体积小、重量轻的特点易装载于航空反潜机动平台上。新型水下小尺寸扩展式基阵声探测系统不仅具有航空用探测设备的特点又兼具扩展后可以形成更大的孔径尺寸,有效地提高系统灵敏度、阵处理增益和定向精度等优势,必将发展为现代反潜战中较为有效的探潜手段之一。结合研制的新型水下小尺寸扩展式基阵声探测系统,开展了工程用系统定向性能水池实验研究。系统设计前端基于模拟退火波束优化算法,中心频率下实测全景波束较优,逼近-30 d B期望旁瓣级的设计要求。后端通过合理的多波束比幅测向算法得到了较好的定向性能,能够满足<3°标准差的指标。实测的定向结果验证了该型水下小尺寸扩展式基阵声探测系统的工程实用性,也为进一步开展工程有效性和稳定性的研究提供了前期的实验参考。
