共查询到20条相似文献,搜索用时 62 毫秒
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FIR的FPGA设计 总被引:1,自引:0,他引:1
本文分析了FIR滤波器的硬件实现技术,并结合QuickRAM系列FPGA的特点,给出了一个高效的设计方法。文中参考设计为一个36Taps 8Bits的10MHz采样速率的FIR。 相似文献
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分析比较了四种红外焦平面列阵(IRFPA)的特征,阐述了不致冷IRFPA具有价格低廉和使用方便的明显优势,对三种不致冷IRFPA作了介绍,特别是辐射热微测量主地IRFPA是当前研制重点,将给夜视热像系统带来革命性变化,最后列举了红外焦平面列阵在非军事领域的应用。 相似文献
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防老化体系处理的粘土胶光氧老化的结构与性能研究 总被引:2,自引:1,他引:1
红粘土可用于替代或部分替代炭黑生产自行车胎、鞋底等橡胶制品 ,但由于粘土中存在变价态金属组分 ,使粘土胶抗氧老化性能明显下降[1] ,本工作研究了经防老化处理后粘土胶光氧老化的性能与结构变化。1 实验按如下方法制备粘土胶样 :A :空白土样 ,B :防老剂APDP +防老剂MB ,C :APDP +MB +防老剂DFC ,D :MB +DFC +金属钝化剂EDTA ,E :MB +DFC +光稳定剂UV 32 7,F :APDP +MB +DFC+EDTA +UV 32 7六种土样。将土样分别与天然胶乳经过共混、凝固、压片、干燥等工序制成相应的a至f六种粘土… 相似文献
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随着16BT芯片功率密度的提高,在中小功率IGBT功率模块中,不带铜底板的IGBT模块已经成为模块封装发展的一个趋势。但是每一种新型结构的功率模块封装都有它的优缺点,新型的不带铜底板的功率模块,它的优点是体积小,重量轻,成本低;缺点是它的散热性能受导热硅脂性能和厚度的影响非常大。本文通过大量仿真及实验数据.详细描述了导热硅脂对不带铜底板模块散热性能的影响,并结合实验数据,介绍了Vincotech公司推出的预涂高性能导热硅脂服务对模块散热的改善效果。 相似文献
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阴极热子组件作为星载行波管的核心部件,要求它具备稳定可靠、寿命长久、低功耗的特点。该文利用数值模拟和热测实验对某星载行波管阴极热子组件结构开展了研究,提出一种接触热阻估算方法,模拟了阴极热子组件结构热特性,设计并完成了阴极热子组件结构热测实验,首次获取了结构在一系列热子加热功率下由内到外的温度实测数据。进一步,通过修正阴极热子组件结构热模拟边界及激励,迭代得到接触热阻值,获取了一种高可靠的阴极热子组件结构热模型,实验表明,该热模型阴极温度计算精度在5%以内,结构最大温度计算误差不超过72 C。 相似文献
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F. MaillyAuthor Vitae A. MartinezAuthor VitaeA. GianiAuthor Vitae F. Pascal-DelannoyAuthor VitaeA. BoyerAuthor Vitae 《Microelectronics Journal》2003,34(4):275-280
This paper describes numerical simulation of a micromachined thermal accelerometer and experimental measurements. The sensor principle consists of a heating resistor, which creates a symmetrical temperature profile, and two temperature detectors symmetrically placed on both sides of the heater. When an acceleration is applied, the free convection is modified, the temperature profile becomes asymmetric and the two detectors measure the differential temperature. This temperature profile and sensor sensitivity according to the distance heater-detector have been studied using numerical resolution of fluid dynamics equations with the commercial code CFD2000/STORM: it shows that the optimum distance between the temperature detectors and the heater is about 300 μm. A thermal accelerometer with 3 pairs of detectors placed at 100, 300 and 500 μm from the heater was manufactured using the techniques of micromachining silicon and experimental measurements have shown a good agreement with the numerical simulations: the experimental optimum distance between heater and detectors seems to be close to 400 μm and the differential temperature of detectors is about 3 °C/g for an operating heater power of 54 mW and an heater temperature rise ΔT of 238 °C. The electrical sensitivity is then 2.5 mV/g. 相似文献
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本文报导了LEC法半绝缘砷化镓单晶中含碳量对SI-GaAs热稳定性的影响。在800℃以上退火,发现当晶体中C含量大于1.5×10~(16)cm~(-3)时,SI-GaAs的热稳定性变差;而C含量小于5×10~(15)cm~(-3)时,通常表现出良好的热稳定性。 相似文献
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本文通过红外热像的测试,结合设备结构特点,对冷壁加氢反应器的裂纹、减薄及剥落等故障的热特性进行了分析与识别,获得的热像特性可供同类设备参考。 相似文献
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A number of advanced applications of digital video technology exist which require pixels to be represented with a resolution higher than the 8 bits that is used in most existing video coding standards. These applications include the video generated by many modern thermal imaging systems used in surveillance applications, which has a dynamic range of 12 bits. In this paper, we describe the modifications required to extend existing video coding standards to support surveillance applications, concentrating on applications with pixels whose dynamic range is up to 12 bits. We examine the tools necessary to implement directly a 12-bit coding algorithm, as well as a scalable coding approach using SNR scalability. 相似文献