共查询到19条相似文献,搜索用时 259 毫秒
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本文介绍了两种热电偶冷端温度补偿电路在物理实验测量中的应用及校准方法,对热电偶的工作原理、冷端温度补偿必要性作了说明,并详细介绍了冷端温度补偿过程. 相似文献
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中温区常用的温度测量元件有热电偶、铂电阻、热敏电阻等.热电偶灵敏度很低,如镍铬-镍铝热电偶的灵敏度仅为 40μV/℃左右,而且需要冷端补偿.铂电阻的灵敏度也饺低,桥路灵敏度在1mV/℃以下,而且体积大,成本高.热敏电阻虽然灵敏度高,但为非线性元件.碳化杖二极管温度传感器的优点是:灵敏度瓦线性好,体积小,成本低,工作电流小,适用于-50-+700℃的温度测量.它作为中温区一种新型传感器而广泛应用于石油化工、电力、机械、食品、纺织、家电、医疗、科学研究等多个领域,有较大的经济和社会效盐.例如,这种传感器仅在油田上应用,每年就为国家增产… 相似文献
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本文从传热学的一般理论出发.讨论了影响温度测量精度的因素,并对薄膜温度传感器,热电偶测温的动态误差作了分析,提出了对一般温度传感器动态误差的修正方案。 相似文献
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1前言高温风洞的温度高达1700℃,流速达0.9马赫数。为了测量风洞中气流温度分布的均匀性,通常采用铂铑30-铂铑10热电偶温度传感器,但是它只能采用逐点移测法,因此它不可能在同一时刻将一条检测线上气流温度测量出来。同时在高温气流测量时,热电偶接点由... 相似文献
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本文在图像处理技术的基础上提出了一种改进的比色法.对于充满颗粒介质的燃烧过程,该方法可从一个彩色CCD图像中获得介质温度和黑度图像.本方法不依赖于CCD的光谱特性及其三基色代表性波长,也不依赖于图像处理系统.在一台480 t/h燃煤循环流化床锅炉上进行了试验.与热电偶测量结果相比,使用本方法测量温度是可行的,而且其与锅炉负荷的相关性也是明显的.使用本系统得到的火焰黑度可以做进一步的研究. 相似文献
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真空环境不仅会导致热电偶等温度传感器表面材料解吸,而且其传热机理也与常压不同,因此采用常压下校准和溯源的温度传感器测量真空环境下气体温度存在诸多不确定性问题,为此,本文利用可调谐二极管激光吸收光谱技术(TDLAS)测量真空环境下气体温度,探索TDLAS温度测量技术在真空环境下的应用前景,在模拟热真空实验过程中,首先将真空气室浸没于恒温槽中,然后利用TDLAS测量真空气室中气体温度,同时利用一等标准铂电阻测量恒温槽的温度,试验结果表明:TDLAS和一等标准铂电阻测量得到的气体温度和恒温槽温度具有高度的一致性,两者之间的误差在恒温槽温度稳定时不超过±0.2℃。 相似文献
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讨论了高温氘等离子体中的势垒贯穿问题。在现有高温氘等离子体参数下,氘核间必须历经库仑散射与隧道贯穿相结合的复合贯穿才能引发核聚变。冷核聚变与热核聚变在本质上没有区别,都需要借助隧道效应才能发生,它们之间的差异仅在于引发隧道贯穿效应的初始条件不同。因此,在冷核聚变研究中除了过热外.也应有放射性物质的释放。 相似文献
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It is common for sample temperatures to be estimated by the power input to the furnace in multi-anvil experiments in which a thermocouple cannot be used or the thermocouple failed during heating. Uncertainties using this technique are often on the order of ±85°C or larger. This paper describes a new method for estimating sample temperature using a second thermocouple outside all pressure media. Temperatures recorded at this external (gasket) thermocouple trend linearly with the internal (sample) thermocouple temperature. Because of thermal lag, it is necessary to determine the first gasket temperature (T0) corresponding to the desired sample temperature. Accurate prediction of T0 for the desired sample temperature can come from relatively few (5–6) gasket-temperature measurements made during the initial temperature ramp over a small temperature range (500–600°C). Using this method and manually ramping to T0 allows for uncertainties in sample temperature estimation as small as ±20°C. 相似文献
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The reliability of thermocouples with separation measuring junction in temperature measurement in the cooling process of hot steel plates with impingement jet has been investigated using direct and inverse finite element analysis (FEA). It is concluded that while the attachment of thermocouple wires on surface has negligible influence on surface temperature distribution during air cooling, the conduction of wires in a jet impingement water cooling process has significant effect on the measured temperature. The disturbance of the temperature field due to the introduction of a small hole for the installation of internal thermocouple has also been studied and showed similar but less pronounced effects to those of the surface measurement. An increased distortion of the temperature field is evident when the thermocouple is attached on the top surface directly above the bottom surface of hole. 相似文献
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设计了基于数据采集卡和LabVIEW的热电偶温度测量系统框图。实验结果表明该数据采集系统能够准确采集到室温环境的温度数值,并具有操作方便、直观、易于保存、精度较高等特点。 相似文献