基于C8051F340的低成本数据采集器设计

针对众多低成本数据采集需求,采用带有片上USB控制器和D／A转换器的混合信号微处理器C8051F340．设计了一款可通过USB接口和LabVIEW图形用户界面实现与PC机联机的数据采集器．同时借助系统的SD卡存储独立实现现场长时间采集数据。该数据采集器成本低,结构简单,体积小．已成功用于工业现场。     

有线数字电视整体转换的思考

对数字电视整体转换中存在的问题进行分析并提出解决方法。指出数字电视发展中应考虑的几个问题,如机卡分离与数字电视一体机、交互数字电视与IPTV、数字电视信源编码、卫星电视与农村数字电视,并提出合理的建议。     

基于智能手机的机动车电子身份认证比对装置

针对传统机动车身份识别系统设备体积较大、不方便携带和移动的问题,文中开发了基于智能手机的机动车电子身份比对装置,其由微型便携超高频RFID读卡器、智能手机、手机APP及后台数据服务器共同组成。该装置充分利用了智能手机的拍摄、数据处理和通讯功能,配合微型RFID读卡器使用,具有方便携带、可同时完成机动车电子和传统号牌双重识别、可实时联网完成数据比对、价格低廉、工作稳定等特点。同时方便稽查人员随身携带使用,可完成对机动车辆身份的流动稽查、违章违法查处、盗抢套牌车辆查处等工作。     

Fast Transmission Photothermal Radiometry via Sampling by an Internal Computer Sound Card

During the last few decades, photothermal radiometry (PTR) has been greatly developed and widely applied in the field of nondestructive testing. However, the traditional PTR system employs an expensive lock-in amplifier to detect the weak photothermal signal, which leads to high cost and long test time. In this paper, a fast transmission PTR system based on sampling by using an internal computer sound card was developed to lower the system cost and shorter the test time. A piece of amorphous silicon (a:Si) thin film solar cells with artificial defects was prepared and tested by the system. The results show that the sharpened defects can be identified easily and quickly according to the significant peaks of the original infrared signal sampled by the internal computer sound card. Furthermore, more detailed defects can be investigated by processing the infrared signal. These validate the effectiveness of the proposed transmission PTR system as a low cost and efficient non-destructive test technique.     

Generalization of the thermal model of infrared radiation sensors

In many theories and applications, generalized models can give a good head start for further research where the implementation of new elements and/or boundary conditions could become quite complex. In this paper the development of a compact thermal model of an infrared sensor will be presented. This thermal model includes not only the thermal resistances and capacitances of the sensor structure itself but the radiative and convective thermal resistances to the ambience and between the sensor plate and the heat source (thermal transfer impedance) which is important when the heat source and the sensor are in close proximity. Limitations and the applicability of the proposed model are also discussed. We also aim to present how the proposed model can be used for other IR sensor structures as well.     

水发食品中甲醛含量快速检测的实验研究

利用品红亚硫酸钠溶液与醛类物质反应后颜色深浅与浓度成正比的原理,使用5种标准浓度的甲醛溶液与希夫试剂反应显色后制作标准比色卡。用待测样品显色后的溶液与制作的标准比色卡进行比对,判断甲醛浓度范围。该方法具有现象明显、灵敏准确、药品易得的优点。因此,可用作中学生课外兴趣实验的实施项目,配制的希夫试剂和制作的标准比色卡也可用于家庭检测水发食品中甲醛含量。     

Examination of Polish Identity Documents by Laser-Induced Breakdown Spectroscopy

Laser-induced breakdown spectroscopy (LIBS) was applied to the preliminary examination of Polish documents – passports and identity cards – for forensic purposes. Several security features of potentially high discrimination capability were selected at both the passports (Alphagram, serial number, the contour map of Europe, and emblem) and identity cards (kinegram, the date of birth, and emblem). Different elemental compositions were identified after comparing the spectra recorded from various measurement locations. It was possible to identify characteristic atomic emission from several elements (such as Ti, Ca, K, Fe, Cr, Mg, Na, La, Cd, Li, V, Al, Mn, Ni, and Cu) based on the type of document, issue date, and evaluated area. In the case of passports, the potentially good discriminators with unique elemental composition were identified, e.g., the serial number and the contour map of Europe printed with the use of intaglio printing technique. Identity cards with the cover of polycarbonate foil constitute a very difficult sample to analyze because of the foil’s influence on the laser ablation phenomenon. This study presents the potential of LIBS as an effective and useful technique to analyze Polish passports for forensic purposes. Its many advantages provide a good alternative to the analytical methods routinely used for the examination of these objects.     

Known Good Die

Advances in reducing size and increasing functionality of electronics have been due primarily to the shrinking geometries and increasing performance of integrated circuit technologies. Recently, development efforts aimed at reducing size and increasingfunctionality have focused on the first level of the electronicpackage. The result has been the development of multichip packaging,technologies in which bare IC chips are mounted on a single high density substrate that serves to package thechips, as well as interconnect them. A number of benefits accruebecause of multichip packaging, namely, increased chip density,space savings, higher performance, and less weight. Therefore, thesetechnologies are attractive for today's light weight, portable, highperformance electronic equipment and devices.In spite of these benefits, multichip packaging has not shown the kind of explosive growth and expansion that was predicted[1]. A major inhibitor for these technologies has been theavailability of fully tested and conditioned bare die, orknown good die. This paper reviews the issues and technologies associated with test and burn-in of bareor minimally packaged IC products.     

物联网卡业务运营风险监控系统的研究

在物联网高速发展的同时,也暴露出一系列的安全问题。本文首先总结了物联网卡业务运营过程中出现的风险场景,然后探讨了物联网卡风险行为特征的提取方法,最后提出了物联网卡异常行为的提取规则,搭建物联网业务运营风险监控系统,以告警并协助处理异常网卡,保障物联网的完全运营。     

一种基于WLP封装的声表面波滤波器

以41°Y X切型铌酸锂作为基底材料,选择双T型阻抗元结构,采用晶圆级封装（WLP）技术,制作了一款相对带宽5.8%,最小插入损耗为-2.8 dB,体积为1.1 mm×0.9 mm×0.5 mm的小型化WLP封装声表面波滤波器。并研制了专用探卡,对封装后晶圆完成在线测试。测试结果表明,探卡测试结果与装配到实际电路的测试结果进行对比,两者吻合较好,解决了WLP封装声表面波滤波器测试难题。