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正交检波在自动阻抗匹配器信号检测中的应用研究 被引量:2
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作者 刘东宇 程健 《仪表技术》 2010年第8期22-24,61,共4页
分析了自动阻抗匹配器中常规信号检测及相应匹配控制算法存在的不足,给出了高速模拟开关正交检波方案。理论分析表明,正交检波在自动阻抗匹配器信号检测中能够同时获得射频信号的幅值和相位信息;模拟实验结果表明,模拟开关正交检波方案... 分析了自动阻抗匹配器中常规信号检测及相应匹配控制算法存在的不足,给出了高速模拟开关正交检波方案。理论分析表明,正交检波在自动阻抗匹配器信号检测中能够同时获得射频信号的幅值和相位信息;模拟实验结果表明,模拟开关正交检波方案有抑制噪声能力强、线性度好、动态范围宽等优点。与仅检测到射频信号的入射功率和反射功率相比,实时监测射频信号的幅值和相位信息,可以进一步提高自动阻抗匹配器的匹配性能。 展开更多
关键词 正交检波 自动阻抗配器 信号检测 模拟开关
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基于FP0-C14 PLC的自动阻抗匹配器的研制
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作者 王登伟 夏洋 《电子工业专用设备》 2011年第6期1-4,52,共5页
为了使随工艺条件变化的动态阻容等效负载自动变换成传输线的特征阻抗50,实现射频电源的最大功率传输,提出了一种PLC控制的自动阻抗匹配器设计方案,采用鉴相鉴幅方法,构建闭环控制系统,实现对动态变化阻抗的实时跟踪。匹配良好时,反射... 为了使随工艺条件变化的动态阻容等效负载自动变换成传输线的特征阻抗50,实现射频电源的最大功率传输,提出了一种PLC控制的自动阻抗匹配器设计方案,采用鉴相鉴幅方法,构建闭环控制系统,实现对动态变化阻抗的实时跟踪。匹配良好时,反射系数可以控制在0.2%以内,具备匹配范围大、可靠性高、抗干扰能力强等特点。最后通过计算机仿真和现场实验验证了该设计方法的有效性和可行性。 展开更多
关键词 射频电源 自动阻抗配器 PLC 特征阻抗 数字电位器
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嵌入式微波自动阻抗匹配系统 被引量:1
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作者 岳文文 程健 +1 位作者 徐公国 林士伟 《测控技术》 CSCD 2015年第3期113-115,119,共4页
阻抗匹配是微波系统的必要环节。传统的手工匹配方式限制了微波系统在很多领域的应用。针对微波等离子体设备,基于ARM CortexM3的LM3S8962处理器,可构建一种微波自动阻抗匹配系统。系统硬件包括信号检测、电机驱动等电路,软件方面进行... 阻抗匹配是微波系统的必要环节。传统的手工匹配方式限制了微波系统在很多领域的应用。针对微波等离子体设备,基于ARM CortexM3的LM3S8962处理器,可构建一种微波自动阻抗匹配系统。系统硬件包括信号检测、电机驱动等电路,软件方面进行嵌入式应用开发、自动阻抗匹配算法研究和编程等。测试结果表明,该系统实现首次自动阻抗匹配的时间低于1 min,跟踪负载动态变化再次实现匹配的时间低于10 s,匹配时反射与入射功率之比低于10%。该系统有利于促进微波技术的应用。 展开更多
关键词 ARM LM3S8962 微波等离子体 自动匹配器
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Architectural Benevolent Builders (ABB): A global system automating integration of structured and semistructured sources
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作者 徐晓飞 邓胜春 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2003年第1期93-98,共6页
We investigate highly sophisticated mechanisms that merge and automate interoperability of heterogeneous traditional information systems together with the World Wide Web as one world. In particular, we introduce the A... We investigate highly sophisticated mechanisms that merge and automate interoperability of heterogeneous traditional information systems together with the World Wide Web as one world. In particular, we introduce the ABB system that employs most of the Benevolent Builders (BB) which are assertions, integration rules, ABB network graph and agents to activate the components’ versatility to reconcile the semantics involved in data sharing in order to withstand the terrific dynamic computer technology in the present and future information age. The ABB is a global application system with its operation covering local databases to the Internet. The first three BB are passive objects, whereas, the agent has a strong versatility to perceive events, perform actions, communicate, make commitments, and satisfy claims. Due to the BB’s power of intelligence, ABB also has the capability to filter out and process only the relevant operational sources like preferences (i.e. customer’s interest) from the sites. The ABB’s richness in knowledge and flexibility to accommodate various data models, manages to link: system to system or firm to firm regardless of the field such as: engineering, insurance, medical, space science, and education, to mention a few. 展开更多
关键词 benevolent builders automation agents agent matcher PP builder TIT Integrator
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Joint detection method of pornographic images with skin-like color background
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作者 唐朝伟 Leng Zhenfeng +2 位作者 Shao Yanqing Tang Hui Zhou Xu 《High Technology Letters》 EI CAS 2012年第2期132-138,共7页
A novel approach is proposed to automatically detect pomographic images with skin-like color background on the Intemet using the locations of human faces and bodies. It has two separate skin-color detection steps: th... A novel approach is proposed to automatically detect pomographic images with skin-like color background on the Intemet using the locations of human faces and bodies. It has two separate skin-color detection steps: the first one is to quickly detect the potential human skin-color regions; and the second one is to use an off-the-shelf face detector to locate a human face and then apply hypothesis testing based on series of assumptions which take into account the face-height ratio, body orientation and modem photograph composition common sense, etc. After that, a template matching method is used to further discriminate normal images or pornographic ones. Experimental results show that the proposed method has high precision and real time speed. 展开更多
关键词 face detection pornographic image skin-like color background skin-color detection template matching
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