共查询到14条相似文献,搜索用时 62 毫秒
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实验室热电阻温度计标定方法研究 总被引:1,自引:0,他引:1
热电阻温度计以其众多的优点在温度测量中得到了广泛的应用,在要求的精度较高时或者应用的条件改变时就需要对热电阻进行重新标定.文章提出了一种实验室可行的热电阻温度计常温下标定方法,介绍了实验原理、所需的实验设备及实验步骤,数据分析结果表明该标定方法比较可靠. 相似文献
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本文提出了一种与真温有关的分度红外温度计的新方法,该方法把温度计对准材料样品而不是黑体进行分度,其特点是避免了光谱发射率的修正和不要求温度计探测器的光谱响应度的数据,因而具有浪大的实用价值,此方法对于工业测温中的重复测量特别有效. 相似文献
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组建了一套低温下高精度热电偶自动标定系统。该系统结构简单,方便可靠,控温精度为0.01K。 相似文献
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一种红外温度计的分度新技术 总被引:1,自引:0,他引:1
提出了一种与真温有关的分度红外温度计的新方法。该方法把温度计对准材料样品而不是黑体进行分度,其特点是避免了光谱发射率的修正和不要求温度计探测器的光谱响应度的数据,因而具有很大的实用价值。此方法对于工业测温中的重复测量特别有效。 相似文献
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在计量标定工作中 ,自动化标定技术的应用将提高标定的效率与可靠性。本文介绍了温度测量系统自动化标定的相关技术和部分成果。 相似文献
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插值公式法是红外辐射温度计标定的一种常用方法。为选择使用8~14 μm波段辐射温度计的标定公式,采用MATLAB仿真的方法,基于8~14 μm矩形光谱响应假设进行定量分析,模拟了几种常用的标定公式在8~14 μm波段、-50~1 000 ℃的标定过程,根据仿真结果,比较了几种标定公式的准确度,并分析了标定温度点的选择对标定结果的影响,最终确定了该波段最适用的标定公式和标定点。 相似文献
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《低温学》2016
The testing of assemblies for use in cryogenic systems commonly includes evaluation at or near operating (therefore cryogenic) temperature. Typical assemblies include valves and pumps for use in liquid oxygen-liquid hydrogen rocket engines. One frequently specified method of cryogenic external leakage testing requires the assembly, pressurized with gaseous helium (GHe), be immersed in a bath of liquid nitrogen (LN2) and allowed to thermally stabilize. Component interfaces are then visually inspected for leakage (bubbles). Unfortunately the liquid nitrogen will be boiling under normal, bench-top, test conditions. This boiling tends to mask even significant leakage.One little known and perhaps under-utilized property of helium is the seemingly counter-intuitive thermodynamic property that when ambient temperature helium is bubbled through boiling LN2 at a temperature of −195.8 °C, the temperature of the liquid nitrogen will reduce.This paper reports on the design and testing of a novel proof-of-concept helium injection control system confirming that it is possible to reduce the temperature of an LN2 bath below boiling point through the controlled injection of ambient temperature gaseous helium and then to efficiently maintain a reduced helium flow rate to maintain a stabilized liquid temperature, enabling clear visual observation of components immersed within the LN2. Helium saturation testing is performed and injection system sizing is discussed. 相似文献
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Jin Nyoung JangByoung Chul Song Dong Hyeok LeeSuk Jae Yoo Bonju LeeMunPyo Hong 《Thin solid films》2011,519(20):6667-6672
A novel deposition process for nano-crystalline silicon (nc-Si) thin films was developed using neutral beam assisted chemical vapor deposition (NBaCVD) technology for the application of the thin film transistor (TFT) backplane of flexible active matrix organic light emitting diode (AMOLED). During the formation of a nc-Si thin film, the energetic particles enhance nano-sized crystalline rather microcrystalline Si in thin films. Neutral Particle Beam (NPB) affects the crystallinity in two ways: (1) NPB energy enhances nano-crystallinity through kinetic energy transfer & chemical annealing, and (2) heavier NPB (such as Ar) induces damage & amorphization through energetic particle impinging. Nc-Si thin film properties effectively can be changed by the reflector bias. As increase of NPB energy limits growing the crystalline, the performance of TFT supports this NPB behavior. The results of nc-Si TFT by NBaCVD demonstrate the technical potentials of neutral beam based processes for achieving high stability and reduced leakage in TFT backplanes for AMOLEDs. 相似文献