共查询到18条相似文献,搜索用时 62 毫秒
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智能化双组分红外气体分析器的研制 总被引:2,自引:0,他引:2
介绍了智能化双组分红外分析器的工作原理、结构及特点。仪器采用8098单片机对信号进行处理及控制,通过键盘设置或更改显示、测量、校正、输出等参数。通过采用前后气室结构的接收器、相应的软件及相敏整流电路等,较大地提高了仪器的稳定性和抗干扰能力。 相似文献
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乘展 《机械制造与自动化》2003,(6):72-73,127
介绍了转炉煤气回收系统红外气体分析器的工作原理、结构及特点,以及在产品设计中对仪器的检测器和电气控制电路的改进措施,大幅度提高了仪器的精度、稳定性和抗干扰能力。 相似文献
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红外气体分析器是一种应用广泛、最具代表性的在线气体分析器,灵敏度高、稳定性好,常见非单元素气体都有可能适用。本文简述了红外气体分析器的测量原理、基本结构以及发展趋势。介绍了几种常用红外分析器及国内外主要厂家产品。实际现场使用时,背景气体及工作环境复杂多变,本文深入分析了测量误差复杂的影响因素,研究了提高分析器现场应用能力的若干方法,以增强红外气体分析器工程应用的适应性和力度。在线分析工程技术的应用及发展,必须有在线分析器这一牢固强大的技术基础。 相似文献
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田秋芳 《仪器仪表标准化与计量》2000,(6):32-36
国际标准IEC1207—1第一版1994—02前言1)IEC国际电工委员会)是一个由所有国家电工委员会(IEC国家委员会)组成的世界范围的标准化组织。其目的是为促进电工和电子领域中涉及标准化问题的国际间合作。为此,IEC除开展相关活动外,还出版国际标准。这些标准的制定工作均由各技术委员会完成;对所开展项目关心的任何一IEC国家委员会都可以参与该项目的制定工作。与IEC协作的国际的、政府的和非政府的组织也可以参与其制定工作。IEC与国际标准化组织(ISO)按照双方协议确定的诸条件保持着紧密的合作。… 相似文献
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介绍了ML98系列气体分析器的主要特点及通讯方式。讨论了命令方式下的编程方法,给出了实现远程通讯的软件框图。 相似文献
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一种新型红外气体分析装置的硬件设计 总被引:4,自引:0,他引:4
本文阐述了一种新型的红外气体分析装置的工作原理和电路设计。它包括光源、光电探测器、模数转换、DSP系统、液晶显示模块和串行通信接口等部分的设计。 相似文献
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分析了红外分析仪在实际使用中产生干扰的原因,介绍了几种提高仪器抗干扰能力的措施,说明了这些措施各自的特点和使用条件。 相似文献
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A. V. Rumyantsev P. R. Shevchenko K. V. Gus’kov 《Instruments and Experimental Techniques》2007,50(3):424-428
A new principle of measuring a gas flow rate from the emittance of the surface of the heat-sensitive element heated to a high (~1270 K) temperature is described. It is shown that the transfer to the high-temperature region ensures independence of gas flowmeter readings on the temperature of both the incoming gas flow and external environment and that the use of a two-chamber design ensures independence of flowmeter readings on its orientation. The flowmeter does not include control and amplifying circuits. The relative error is ~0.5% and does not exceed ~0.2% at the flow orificing. The sensitivity of the flowmeter varies from 1.9 to 1.0 V/(mg s?1) in a 0-to 8-mg/s range. The time constant is not worse than ~0.5–0.6 s at a 50% flow rate variation, and that of the orifice flowmeter is ~0.2–0.3 s. 相似文献
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The detection of gas molecules is critical for environmental monitoring, chemical process control, agriculture, and medical applications. Therefore, gas sensors and electronic noses (e-nose) are widely studied by researchers all over the world. Graphene has been considered to be a promising gas detection material due to its special electronic properties, which are strongly influenced by the adsorption of extrinsic molecules. Doping of metal oxides and nanometal particles has also been extensively studied and their electrical property is highly sensitive to the properties of absorbed gases. Carbon nanotubes (CNTs) are expensive but have advantages of high sensitivity, good reversibility, and nice stability. Several research groups have studied the mixed structure of the above three materials with their derivatives blended, which show improved gas sensing capabilities. This review summarizes the state-of-the-art progresses in the research on gas sensors and e-nose, based on graphene, metal oxide, and CNTs. 相似文献
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M. Z. Umar V. Vavilov H. Abdullah A. K. Ariffin 《Russian Journal of Nondestructive Testing》2016,52(4):212-219
Potentials of a novel non-destructive testing technique called ultrasonic infrared thermography (UIT) have been widely recognized for the last decade. This technique is promising for many practical industrial applications being of interest for academic researchers who deal with thermomechanical problems. Significant improvements in the performance of infrared imager have also contributed to increasing popularity of this inspection technique. This paper presents an introduction to the use of UIT in NDT, combining a review of earlier and later research with some experimental illustrations. 相似文献
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B.C. Majumdar 《Wear》1980,62(2):299-314
The literature pertaining to externally pressurized hole admission gas bearings is briefly reviewed. The advantages, limitations and applications of such bearings under various design conditions are discussed. 相似文献
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小型红外CO2气体分析仪 总被引:1,自引:2,他引:1
研制了一种小型红外CO2气体分析仪.为了有效消除测量数据的漂移,提出了一种高性能的空间双光路光学探头结构,该探头结构包括一个带有反光镜无窗封装的红外光源,一个开放式气室以及一个红外接收器件.设计了旋转抛物面接收光锥,从而大大提高了分析仪的信噪比.该分析仪未采用采样气泵,而改用扩散方式进行采样,同时光源采用了周期性开关的工作方式,以消除背景杂光的干扰.该分析仪测量范围:0~3%,精度:0.028 0%,响应时间:2.5 s,体积:80 mm(L)×78 mm(W)×35 mm(H),重量:200 g,功耗:1.5 W. 相似文献