共查询到18条相似文献,搜索用时 430 毫秒
1.
2.
3.
4.
5.
6.
《中国计量学院学报》2020,(1):16-20
目的:针对国内儿童洗胃机校准规范以及校准装置方面空缺的状况,研制一种儿童洗胃机校准装置。为保证其校准的可靠性与准确性,需要对装置不确定度进行研究。方法:介绍了装置的工作原理,对校准装置中所使用的传感器设计了相应的实验,并对校准装置进行了整体评价,分析了一些较为重要的不确定度分量和一些可忽略的不确定度分量。结果:根据分析计算得到了标准不确定度和扩展不确定度,压力和流量的扩展不确定度分别为0.52 kPa和0.026 L/min。结论:该装置符合技术指标,能够为以后相关校准规范的出台提供一定的参考。 相似文献
7.
通过设计一种智能压力校准装置,利用计算机通过软件对装置进行控制,实现对压力仪表的自动校准。经过反复试验,该装置运行稳定可靠。经评定,该装置的不确定度为0.02%,可开展0.1%精度压力仪表的计量校准工作。 相似文献
8.
利用高精度压力传感器作为原位传递标准,提出了一种活塞压力计校准新方法。对传感器的分辨率和短期稳定性进行了测试,并评估了传感器线性系数对校准结果的影响。对比研究了新方法和传统方法的校准结果,两者的不确定度均约为5×10-6(k=1),且在不确定度范围内是一致的。在新方法的基础上研制了活塞压力计自动化校准装置,实现了压力控制、阀门操作和数据采集等功能的自动化。该自动化装置提高了活塞压力计校准的效率。 相似文献
9.
10.
11.
12.
13.
目的 为了解决传统硬质极板电容式液位传感器在曲面容器上性能不佳的问题.方法 从寄生电容的基本原理出发,研发一种可以包覆于圆柱面容器的柔性极板电容式液位传感器,建立液位与电容量间的数学关系,完成相应的软、硬件设计,通过STM32与柔性极板电容式液位传感器之间的I2C通信,实现液位传感器的在线水位检测,完成传感器性能测试实验,包括线性度、重复性、迟滞特性,并提出一种基于该传感器的流量测量方法.结果 该传感器工作稳定,具有良好线性度,重复性误差为2.70%,在有效测量范围的迟滞特性参数都小于1.69%.结论 该柔性极板电容式液位传感器安装使用便捷、与容器外壁贴合度较好,且测量结果不受容器水平横截面积、待测液体成分的限制,可以实时监测连续液位的变化.制作的传感器可以用在直径20 mm和更小的待测容器上,也可用作微小流量测量. 相似文献
14.
15.
16.
《Vacuum》2013
A miniature thrust stand in man-made vacuum environment, based on the principle of leaf spring bending deformation, capable of supporting testing of thrusters having a total mass of up to 300 g and producing thrust levels between 1 μN and 760 μN has been developed and tested. A case-study measurement was conducted for a Colloid Micro-Newton Thruster (CMNT) to investigate the feasibility of the proposed system under vacuum conditions. Displacement of the leaf spring deforming was measured using a linear capacitive displacement sensor (LCDS). An in situ calibration rig allows for steady-state calibration before, during and after thruster operation. To validate this method, extensive thrust measurements were carried out on a colloid thruster that produces μN magnitude level thrust under vacuum conditions. Results show that the measurements were very repeatable, producing results that compare favorably with measured data with an uncertainty of approximately 10%. 相似文献
17.
The paper deals with calibration of digital indication thermometers designed for air temperature measurements. These were calibrated by comparison with a reference thermometer in two different calibration media: in the air when a climatic chamber was used and in a liquid when a calibration bath was used. The main difference between the media was thermal conductivity, which was more than ten times lower in the air. To compare both methods, we calibrated two sets of air thermometers twice. The first set comprised of small temperature loggers with an internal sensor, whereas the second set was a group of temperature probes connected to the measurement unit. The temperature ranges for the loggers were from 0 \(^{\circ }\)C to 40 \(^{\circ }\)C and for the probes from ?20 \(^{\circ }\)C to 60 \(^{\circ }\)C. The results showed that the measured temperature errors were smaller in the bath as well as less scattered. Furthermore, the assigned measurement uncertainty was lower, if calibration was performed in a calibration bath, mostly due to better thermal homogeneity of a liquid compared to the air in a climatic chamber. Calibration shall assure traceability of a measurement equipment in such a way that a calibration procedure simulates an actual use of equipment; otherwise, the corrections and associated measurement uncertainty could be misleading. Therefore, when air thermometers, which are designed to measure a gaseous medium, are calibrated, they should be calibrated under similar conditions as they are used. The paper presents the differences in results of calibration of air thermometers under different calibration conditions. 相似文献