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任仲强弭艳井海明张红霞马兵兵 《安全与电磁兼容》2023,(3):64-68
电场辐射发射强度(RE102)指标是隔离驱动器电磁兼容试验过程中的考核指标,辐射发射强度的强弱直接影响电磁兼容试验的成败,进而影响整个任务的成败。针对电场辐射发射强度展开理论研究,并分析引起指标超标的辐射发射源头。采用一种有效降低辐射发射强度的关键技术,对比了采用关键技术前后的电磁兼容试验数据,验证了理论研究的屏蔽效果与试验测试结果相符合,屏蔽措施有效降低了辐射发射强度。通过工程应用,满足系统辐射发射指标要求。 相似文献
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黄勇陈嘉晔温宇标樊翔郑毅陈欣超 《安全与电磁兼容》2022,(2):72-75
简述了超声波妇科治疗仪的基本工作原理、工作模式及试验方法,基于电磁兼容检验中传导发射和辐射发射试验及超标情况,从整改的视角分析了超声波妇科治疗仪发射试验失败的原因,并采取了屏蔽臭氧发生器、冲洗泵的外壳接地且增加吸收式滤波电路等整改措施,整改后传导发射和辐射发射测试结果满足GB 4824-2019规定中1组B类设备的限值要求。最后总结了抑制超声波妇科治疗仪发射水平的屏蔽、接地和滤波三大电磁兼容整改措施,供检验机构和生产企业等相关技术人员参考。 相似文献
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某军品雷达项目的电磁兼容试验中,通过排除EUT(Equipment under test)配套工装带来的测试干扰,改善EUT及电缆屏蔽性能等方法,使电磁场辐射发射(RE102)测试结果大范围超标问题得到解决。本文结合试验讲述如何分析超标原因,实现整改策略。期望为其它项目的试验提供可参考的、更有效的帮助。 相似文献
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《电子技术与软件工程》2015,(8)
电磁兼容性(EMC)是指设备或系统在其电磁环境中符合要求运行,并不对其环境中的任何设备产生无法忍受的电磁干扰的能力。因此,电磁兼容检测及整改是一项非常重要的工作。本文主要介绍了传导,辐射发射超标产生的原因及整改抑制措施,并通过一整改案例对整改措施进行了有效的验证。本文对产品的辐射,传导发射超标的整改具有有效的参考作用。 相似文献
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随着电子技术的飞速发展,高密度、高频率的电子产品迅猛增长,势必导致电磁环境的进一步恶化,从而引起一系列的电磁兼容问题.本文以电磁兼容为主线,以消除各部分电路之间的干扰、降低印制电路板(PCB)的传导发射和辐射发射为目的,对PCB的抗干扰设计进行了综合分析,确保产品顺利通过电磁兼容测试. 相似文献
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辐射骚扰超标通常是电磁兼容测试中最常见也是最难对付的.本文通过案例清楚说明了一般整改思路及每一步骤,特别强调超标原因的正确分析,并就此指出几个关键注意事项. 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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The approaches to prepare a uniform and unified scientific terminology of chemical carcinogenesis are presented. The main definitions proposed (carcinogen, initiation, promotion, mutagen, multistage carcinogenesis, anti-carcinogen, cocarcinogen, carcinogenic risk, etc.) are based on the current state of comprehending mechanisms of the action of chemical carcinogens. 相似文献
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近红外光谱技术在水果品质无损检测中应用的研究与现状 总被引:6,自引:0,他引:6
简单概述了我国水果产业的发展现状,着重阐述了国内外利用近红外光谱技术进行水果品质无损检测的最新研究进展,分析了当今研究中存在的问题,并对利用近红外光谱技术进行水果检测的前景进行了展望,提出了一些建议。 相似文献