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无线无源高温压力传感器在高温、高压等恶劣环境中应用日益广泛,其耐高温性能已成为衡量传感器的一项最基本且重要的指标。利用低温共烧陶瓷LTCC(Low Temperature Co-Fired Ceramic)技术,分别设计和制作了陶瓷基片上电感及电容器件,并进行高温特性测试,通过讨论和分析确定了造成电感和电容随温度变化的原因。测试结果表明:在100℃~500℃温度范围内,电感L基本保持不变,等效串联电阻R增大了2.7倍,电容C增大了5.3%,从而LC谐振传感器的品质因数Q减小了72.8%。该测试及分析对高温环境下基于LC谐振式压力传感器的优化设计具有重要的指导意义。 相似文献
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设计了一个基于低温共烧陶瓷(LTCC)技术的无线无源双参数传感器,传感器基于LC(inductor-Capacitor)谐振原理,询问天线通过无线遥测的方式获取传感器的压力和温度信号.在传感器基板上集成了两个LC谐振回路,谐振回路中两个电容分别对压力和温度参数敏感,同时两电感采用特殊结构来减少双参数在测试时的互感串扰.搭建了温度-压力复合测试平台,对传感器进行了相关测试.传感器最高测试温度为300 ℃,温度灵敏度为-14.27 kHz/℃,压力灵敏-13.75 kHz/kPa,实验结果表明,这种设计能明显减少两参数之间的互感影响. 相似文献
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设计一种基于氧化锆( ZrO2 )的高温非共烧陶瓷压力传感器.在已有的低温共烧陶瓷( LTCC)工艺的基础上,经过改进采用了高温非共烧技术进行陶瓷传感器的制作.先进行传感器基底的制作,再制作传感器的金属电路部分.这样解决了高温共烧技术中各材料高温烧结热膨胀系数不匹配的问题.传感器信号读取采用两个电感耦合的方式,实现了非接触压力测量.制作的传感器高温环境下力学特性稳定.测试结果显示:传感器的谐振频率随外加压力的增加而减小,其谐振频率变化对压力的响应灵敏度约为491. 10 kHz/bar. 相似文献
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氧化锆功能陶瓷因其稳定的物理特性、机械韧性和高温鲁棒性得到了广泛的应用.从非接触无源信号测试技术的基础研究出发,以LC无源谐振电路为技术背景,提出了采用氧化锆流延生带来实现MEMS压力微结构的设计方案,并通过利用陶瓷生片叠片工艺技术和厚膜印刷技术成功制备了压力传感器.根据电感耦合原理实现了传感器的非接触环境压力测试,通过在最大耦合距离为1 cm的条件下测试获得的压力传感器的灵敏度为7.5 MHz/bar.本传感器有效避免了微器件封装、引线外联的问题,从而为以后压力传感器应用在较高温度环境奠定基础. 相似文献
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利用MEMS(微机电系统)工艺中的扩散,刻蚀,氧化,金属溅射等工艺制备出SOI高温压力敏感芯片,并通过静电键合工艺在SOI芯片背面和玻璃间形成真空参考腔,最后通过引线键合工艺完成敏感芯片与外部设备的电气连接.对封装的敏感芯片进行高温下的加压测试,高温压力测试结果表明,在21℃(常温)至300℃的温度范围内,传感器敏感芯片可在压力量程内正常工作,传感器敏感芯片的线性度从0.9 985下降为0.9 865,控制在较小的范围内.高温压力下的性能测试结果表明,该压力传感器可用于300℃恶劣环境下的压力测量,其高温下的稳定性能为压阻式高温压力芯片的研制提供了参考. 相似文献
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S. Shaw 《Journal of Computer Assisted Learning》1993,9(2):93-99
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained. 相似文献
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European Community policy and the market 总被引:1,自引:0,他引:1
C. Lloyd 《Journal of Computer Assisted Learning》1993,9(2):86-91
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven. 相似文献
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融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。 相似文献
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张涛 《计算机测量与控制》2015,23(1):86-89
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值. 相似文献
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Wayne O’Brien Author Vitae 《Journal of Systems and Software》2008,81(11):1997-2013
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them. 相似文献
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This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives. 相似文献
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潘丽 《自动化与仪器仪表》2014,(7):80-82
自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。 相似文献
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Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what
is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic
sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and
its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of
an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify
robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can
or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest.
This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January
31–February 2, 2008 相似文献
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Jacob Palme 《Software》1979,9(9):741-747
The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users. 相似文献