共查询到19条相似文献,搜索用时 78 毫秒
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文章详细描述了针对低温真空泵用的紧凑型两级G-M制冷机的实验系统和测试方法;试验测试了不同的蓄冷材料,尤其是磁性蓄冷材料来提高制冷机性能;在一种结构十分紧凑的两级G-M制冷机上,在12K获得了4W的制冷量,最低制冷温度为7.3K。文中还对该制冷机在没有吸附装置的情况下做了对比实验研究,有利于扩展G-M制冷机的用途。 相似文献
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薄膜Pt电阻温度计的标定及低温磁阻 总被引:1,自引:0,他引:1
本对薄膜铂电阻温度计一4.5K-250K温区及0-5T纵向磁场下的进行标定,并对其在T〈50K的磁阻效应进行了讨论。实验曲线细致光滑,实验数据表明它在低温下仍有一定测温灵敏度,如在10K时每度仍有十几微伏的变化。 相似文献
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低温温度计标定精度影响因素的研究 总被引:1,自引:1,他引:0
在托卡马克核聚变实验装置中,装置的热负荷计算、导体超导性能和运行稳定性都与运行温度有很大关系,因而要求低温的温度测量有较高测量精度.文中主要讨论低温温度计在标定过程中各种因素对标定精度的影响,并提出一系列的解决办法,取得了好的标定结果,满足了工程的需要. 相似文献
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主要介绍G-M制冷系统热力性质参数及循环性能参数的计算模块的设计,该模块用Visual Basic 6.0语言进行开发,具有良好的人机交互界面,使用方便,运行可靠.将该模块用于常规G-M制冷机的热力计算,结果合理,达到了预期的要求.因此,该模块在小型低温制冷机结构设计方面具有广泛的推广价值和应用前景. 相似文献
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随着大型低温真空泵、高低温超导器件、核磁共振成像仪、红外探测器、低温光电子学器件的迅速发展,以及作为传统蓄冷材料的铅(Pb)等有害物质的限制使用,对大冷量新型蓄冷材料G-M制冷机的发展提出了迫切的需要。文中主要介绍国内外大冷量G-M制冷机及新型磁性蓄冷材料的最新研究进展和应用情况,并提出了下一步的研究方向。 相似文献
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根据Redebaugh相位分析理论,建立了双向进气对于G-M型脉冲管制冷机性能影响的数学模型,在此基础上提出了制冷机性能优化的若干措施。同时建立了单级G-M型脉冲管制冷机性能实验系统,通过改进小孔阀的开度,优化旋转阀的进气频率和双向进气的开度,使系统性能得到了明显的改善。 相似文献
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A temperature distribution sensing system based on the reflection spectrum of a 70 mm apodized chirped fiber Bragg grating has been demonstrated. Reflection variations created by the Fabry-Perot effect due to the intra-grating wavelength shift are presented. By fitting a parametric transfer matrix model of the grating response to measured spectra, the temperature change, position and width of a localized temperature change are obtained. This system is particularly attractive of its simplicity, high spatial resolution and ability in measuring a non-monotonic distribution. Experiments to measure two localized heating regions along the grating indicate that the technique is promising for measuring more complex temperature profiles. 相似文献
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Jun-Kyu Seo 《Optics Communications》2010,283(7):1307-1310
Optical temperature sensors consisting of low-loss polymer waveguides with a glass lower cladding are demonstrated. The refractive index of the optical polymer is precisely controlled to have a certain initial refractive index contrast with the glass substrate used for lower cladding. Depending on the initial index contrast, the operating temperature ranges of the sensors are determined. The polymer devices are fabricated by spin-coating and UV curing, which could be replaced by the cost-effective imprinting or injection molding process. The sensor exhibits a monotonic decrease of the transmission intensity corresponding to the temperature increase, which enables straightforward reading of temperature from the measured optical power. 相似文献