Labview在检测与传感技术课程教学中的应用

本文分析了原有检测与传感技术课程在实践教学中存在的弊端,提出了将理论课程教学与Lab-view软件技术结合的新方法,从而提高学生实际动手能力,激发学生学习兴趣和探索精神,实现实验室教学与工业实际应用接轨的实践教学新方案。     

Testing of industrial temperature sensors in liquids

The response of temperature sensors depends on the thermophysical properties, flow rates, temperatures and pressures (for compressible fluids) of fluid in which they are immersed. Analysis indicates that the time of response is inversely proportional to the heat transfer coefficient and to a power of the velocity of the ambient fluid. The paper is concerned with the validity of these relations. Experimentation involved (a) different liquids, (b) different velocities, and (c) different sensors. Extensive testing and curve-fitting of the results is shown not to lead to absolute validation of the relation between the time constant and the head transfer coefficient. The latter was based on a particular correlation. The results are discussed.     

Gas-based temperature measurements in the range of the ITS-90

The survey is intended to provide up-to-date information on the developments in thermometry involving the use of gaseous substances. The use of well specified thermodynamic states of condensed gases as fixed temperature points (2.2–220 K) is illustrated, and the sealed-cell method described as the most effective for their realization. Secondly, thermometric methods exploiting a pressure-temperature relationship are described. For the gaseous state, the developments in gas thermometry (1–300 K) are illustrated, not only for absolute thermometry, but also for interpolating thermometers (as required, e.g., by the ITS-90), and for simple and practical self-contained devices. Subsequently, in connection with condensed gases, developments in vapour-pressure thermometry are described.     

汞三相点的复现

利用自制的超高纯汞三相点容器,复现了1990年国际温标(ITS-90)中新设定的汞三相点。结果表明其融化范围和凝固范围均在0.1mK以内,复现性优于0.1mK,两者的符合程度也在0.1mK之内,分别用纯度为99.99999％的超高纯商品汞和实验室清洗的汞经高真空蒸馏制备的两个密封容器,测定结果在实验误差内一致,差异不大于0.1mK。文中介绍了三相点容器的制备工艺要点。     

Transparent perovskite glass-ceramics for visual optical thermometry

Optical thermometers have aroused considerable attention in recent years,and the increasing demand of sensitivity for practical application encourages the investigation on developing innovative non-contact optical thermo metric materials with higher sensitivity and accuracy.Perovskite quantum dots(QDs)with excellent temperature-dependence optical properties,provide a feasible approach to realizing the detection of temperature change,however,their poor high temperature thermal stability and the facile realization to obtain the production remain a daunting challenge.Herein,growing Tb~(3+)-doped CsPbl_3 QDs in situ in borosilicate glass is proposed,which ensures the phase stability,and high-efficiency florescence output of the all-inorganic perovskite as a temperature sensor.A higher absolute and relative temperature sensitivity(0.0398 K~(-1) and 7.12%/K,respectively),along with the visible color change from orange-red to yellow-green with the increase of temperature is accomplished.Notably,the repeatable florescence intensity of Tb~(3+)-doped CsPbl_3 QDs under high temperature enables their temperature sensing application.