共查询到20条相似文献,搜索用时 31 毫秒
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介绍了利用高精度低噪声A/D和高精度应变式称重传感器以及适当的处理软件,设计出的高精度电子天平.该天平免除了A/D外部复杂的前置放大器,简化了生产成本,提高了可靠性与稳定性,保证了相应的计量精度. 相似文献
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介绍了将ICL71 35A/D转换器速度提高到 2 0~ 2 4次 /秒的原理、实施硬件电路及主要编程。目的在于达到拓宽ICL71 35的应用范围 ,以提高相关设备的性能价格比 相似文献
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本文介绍了24位A/D转换器AD7711的主要特点、结构和工作原理,以及AD7711在温场测试系统数据采集器中的应用。 相似文献
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本文介绍了一种采用AT89C51单片机T0定时器/计数器,通过测量7135A/D转换器的BUSY脉冲信号宽度,由软件计算出被测模拟电压的一种方法。在智能仪器中节省了单片机的口线,提高了系统资源的利用率。 相似文献
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基于Hilbert-Huang变换测试A/D转换器有效位数的正弦曲线拟合法 总被引:1,自引:0,他引:1
提出了一种基于Hilbert-Huang变换(HHT)方法的估计A/D转换器(ADC)有效位数(ENOBs)的正弦曲线拟合算法.仿真结果表明,该算法精确且高效,可以较好地求出拟合正弦波曲线的波形参数,避免一般正弦拟合法中严格选取参数初值以及求解非线性方程组的麻烦,并且在低分辨率信号源的情况下就可以精确测出高分辨率ADC的ENOBs. 相似文献
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单片机内嵌式A/D的使用要比外置式A/D简单、方便,且容易获得更高的信噪比,但其分辨力相对比较低,难以满足精密测量的使用要求。本文介绍了一种提高单片机内嵌式A/D转换器分辨力有效实用法,简单外转电路和单片机内部软件计算可以将原分辨力将提高1 ̄3倍。 相似文献
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许文斌 《中国新技术新产品》2008,(12)
详细介绍集成芯片MAX038性能,结合单片机AT89C52设计了波形可选择的高频信号发生器,该信号发生器可作为简单交流、脉冲控制、分频计数等电子实验的信号源,实践证明该信号发生器的性能稳定可靠. 相似文献
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The oxidation behavior of Ti3AlC2-20TiB2 composite was studied at 500?°C–900?°C in air. The composite showed a very low oxidation rate and followed a logarithmic oxidation law. The in-situ incorporation of TiB2 suppressed the anomalous rapid oxidation of the substrate Ti3AlC2 occurred near 600?°C by forming a protective B2O3 glass layer, and also improved the oxidation resistance of the MAX phase at intermediate-temperature. 相似文献
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本文研究了一种新型的伏安特性测试仪。详细地给出了该测试仪的系统实现原理框图,并对其中的主要部分进行了详细地阐述,给出了相应部分的电路原理图,以及软件实现流程图,并通过对所设计的样机进行了伏安特性的测试,根据测试结果可以看出,该测试仪具有很好的性能,是一个比较实用的测试仪器。 相似文献
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《Current Opinion in Solid State & Materials Science》2019,23(3):164-178
The family of MAX phases and their derivative MXenes are continuously growing in terms of both crystalline and composition varieties. In the last couple of years, several breakthroughs have been achieved that boosted the synthesis of novel MAX phases with ordered double transition metals and, consequently, the synthesis of novel MXenes with a higher chemical diversity and structural complexity, rarely seen in other families of two-dimensional (2D) materials. Considering the various elemental composition possibilities, surface functional tunability, various magnetic orders, and large spin–orbit coupling, MXenes can truly be considered as multifunctional materials that can be used to realize highly correlated phenomena. In addition, owing to their large surface area, hydrophilicity, adsorption ability, and high surface reactivity, MXenes have attracted attention for many applications, e.g., catalysts, ion batteries, gas storage media, and sensors. Given the fast progress of MXene-based science and technology, it is timely to update our current knowledge on various properties and possible applications. Since many theoretical predictions remain to be experimentally proven, here we mainly emphasize the physics and chemistry that can be observed in MXenes and discuss how these properties can be tuned or used for different applications. 相似文献
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MAX 7000系列是工业界中速度最快的高集成可编程逻辑器件系列,它们的输入寄存器的建立时间非常短,能提供多个系统时钟且有可编程的速度/功率控制.I/O引脚输出电压摆率是可以控制的,这提供了一个附加的开关噪声电平的控制.MAX 7000系列是编程信息不易丢失的可电擦除的器件. 相似文献
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《Advanced Powder Technology》2020,31(8):3533-3539
In order to clarify the effects of the proportion of raw powders, heating temperature and holding time on the purity and properties of MAX phase Ti3AlC2, powder mixtures of Ti, Al and C powder with different ratio were prepared by planetary ball mill and heated under different conditions by spark plasma sintering. The microstructures and phase structures of the as-synthesized samples were characterized, the correlation between the mechanical properties and microstructure and fracture mechanism were investigated systematically. The results show that with the proportion of raw powders Ti:Al:C = 3:1.2:2, the sample heated at 1300 °C for 60 min has the highest purity 97.23 wt% of MAX phase. It has a compact and uniform lath-like structure with the length-thickness ratios of 3–5 and excellent comprehensive mechanical properties: the Vickers hardness, bending strength and fracture toughness are 5.26 GPa, 500 MPa and 7.35 MPa∙m1/2, respectively. The experimental results show that among the three factors, the proportion of raw powders has the greatest influence on purity of Ti3AlC2 phase, followed by heating temperature and holding time. The fracture morphologies of the tested samples demonstrate that under the action of external force, extrusion and kink occurred in the layered structures of Ti3AlC2 phase. These two forms of energy dissipation lead to the bending strength and fracture toughness of Ti3AlC2 are higher than that of traditional ceramics. 相似文献